Short Answer

A Hantavirus pandemic in 2026 is not anticipated by the market, which prices the probability of such an event at 3.4%.

1. Market Behavior & Drivers

This market has seen no trading volume, indicating the price does not reflect trader sentiment or a reaction to any specific news. The minor fluctuations between 3.5% and 3.8% are nominal adjustments in an illiquid market, not a response to external events.
The Andes hantavirus outbreak on the M/V Hondius cruise ship, which was reported in May 2026 and declared over by the WHO and other health authorities by July 2, 2026, did not generate any trading activity. The market's price remained static within a narrow band long after this event was resolved, underscoring the complete absence of participation.
  • Since last update (~28d): The market's probability for "Yes" declined by -0.1pp, compressing the model-market edge by +0.1pp.
  • The headline model probability for a pandemic in 2026 remained stable at 1.5%.
  • The confidence score remained unchanged at 5.0, reflecting no new information.
  • No pandemic likely; hantavirus lacks efficient human-to-human transmission.
  • 2026 U.S. hantavirus cases remain significantly below annual averages.

Who Wins and Why

Outcome Market Model Why
Yes 3.4% 1.5% Unusual weather patterns could lead to rodent population booms, increasing hantavirus transmission risk in 2026.

Current Context

No hantavirus pandemic has materialized in 2026; outbreaks remain contained. A cluster of Andes hantavirus cases occurred on the M/V Hondius cruise ship in May 2026, but global health authorities, including the World Health Organization (WHO), declared the outbreak over by July 2, 2026 [1]. This event resulted in 13 reported cases (12 confirmed, 1 probable) and three fatalities, reflecting an approximate 40% case-fatality rate within this specific outbreak [2][1][3][4]. Both the WHO and the European Centre for Disease Prevention and Control (ECDC) consistently assessed the risk to the general global population as low [2][1][3]. Hantavirus cardiopulmonary syndrome is a serious, often fatal disease transmitted by exposure to virus-contaminated deer mice droppings, particularly when dust or droppings become airborne [5].
Expert analysis indicates low potential for a hantavirus pandemic. Experts state a hantavirus pandemic is highly unlikely because its high case-fatality rate tends to eliminate hosts too quickly for widespread, sustained transmission [4]. Furthermore, transmission typically requires close, prolonged contact [4]. Public health authorities continue to monitor isolated cases, such as an imported case reported in France in August 2026, as standard epidemiological practice, but these do not constitute a pandemic [6]. As of September 1, 2026, no reports or credible expert-curated evidence indicate a hantavirus pandemic; official weather-related reports currently focus on seasonal challenges including drought, extreme heat, wildfire risk, and hurricane outlooks [7][8]. Unlike previous pandemics like COVID-19, where advanced data assimilation techniques modeled evolution, no such modeling or public concern exists for a hantavirus pandemic in 2026 [9].
Sources (9)
  1. 1Andes hantavirus outbreak in cruise ship - ECDC - Europa.euecdc.europa.eu
  2. 2Hantavirus outbreak linked to cruise ship travel, Multi-...who.int
  3. 3Andes Hantavirus Outbreak on a Cruise Ship, 2026nejm.org
  4. 4Why hantavirus is not the new COVID, according to expertsmedicalxpress.com
  5. 5Health Impacts:weather.gov
  6. 6Epidemiological update – 11 August 2026: Imported case of Andes hantavirus in the EU/EEAecdc.europa.eu
  7. 7August-October 2026 Outlook: Perspective for the Lower Rio Grande Valley/Deep S. Texas Regionweather.gov
  8. 8National Weather Service [WFO Pendleton, OR] Drought Information Statement - August 13, 2026weather.gov
  9. 9Using the power of data assimilation to model the COVID-19 pandemic | ECMWFecmwf.int

2. Price Chart

Historical Price (Probability)

Outcome probability
Date

3. Market Data

Contract Snapshot

This Kalshi prediction market resolves to "Yes" if the World Health Organization (WHO) explicitly characterizes Hantavirus, Hantavirus Pulmonary Syndrome (HPS), Hemorrhagic Fever with Renal Syndrome (HFRS), or a related outbreak as a "pandemic" in an official public communication by December 31, 2026, 11:59 PM ET. An explicit characterization from official WHO sources is required, meaning a Public Health Emergency of International Concern (PHEIC) alone does not qualify unless also explicitly called a pandemic; otherwise, the market resolves to "No."

Available Contracts

Market options and current pricing

Outcome bucket Yes (price) No (price) Last trade probability
Yes $0.04 $0.96 3%

Market Discussion

Traders overwhelmingly believe a Hantavirus pandemic in 2026 is highly improbable, with the market showing a 96% chance of "No." This consensus is based on the limited person-to-person spread observed in a May 2026 Andes virus outbreak on a cruise ship, which was quickly contained and attributed to a single zoonotic spillover. Traders argue that Hantavirus's biology and current endemic circulation limit its pandemic potential, unless significant evolutionary changes lead to enhanced human-to-human transmissibility.

4. Trust Index

Octagon Trust Index Polymarket 68 Caution

Settlement is decided by a token-holder vote.

Integrity risk· Outcome control

How it adds up
Integrity80% of score69Caution
Trade quality20% of score61Caution

Includes the cost to trade: a $10,000 order can't be filled here because the order book is too thin.

Trust score68Caution

Weighted blend with hard caps — a critically weak safety pillar, or a severe trading anomaly, caps the total regardless of the rest. Full methodology · About the Trust Index

Trust profile
Integrity5 screens run · 4 don't apply · 1 awaiting data
Market integrity
65Caution

Outcome can be influenced

Outcome controlStructural risk · high confidence

Settlement is decided by a token-holder vote.

Screened clean
Participant influenceNo conflicted participant detected. Clear
Large tradesNo single trade dominates the tape. Clear
Thin-volume movesNo significant move Clear
Size patternsNo distribution read Clear
1 screen not run
Thin-leg conviction · doesn't apply to this market type
Info fairness
80Good

Structural prior — no screens apply

No suspicious activity on any screen

4 screens not run
Move vs. catalyst · doesn't apply to this market type
Longshot repricing · doesn't apply to this market type
Pre-broadcast certainty · doesn't apply to this market type
Cross-venue timing · data source not connected
Resolution quality
60Caution

Settlement depends on token voting

No suspicious activity on any screen

Resolution rules read: Clear

Settlement is decided by a token-holder vote.

Liquidity
58Thin

Expect slippage beyond small size

1 contract

Yes58
Thin · low confidence

Light recent trading — size may not fill near the screen price.

Move quality
70Stable

No significant moves

1 contract

Yes—
No significant move (6h)

Price was stable over the last 6 hours.

Rule clarity
100Clear

Counts toward Resolution quality, not here

1 contract

Yes100
Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
Trade quality
61Caution

Order book is thin

Tradable, but expect execution cost beyond small sizes.

Outcome quality 58 (notional-weighted)

$100 order: 0.0c slippage (<1% of a 3c contract)

$1,000 order: 0.0c slippage (<1% of a 3c contract)

$10,000 order: book too thin to fill

Yes58Market scoreLiquidity58Move quality–Rule clarity100
Why 58
Liquidity
58 · Thin · low confidence

Light recent trading — size may not fill near the screen price.

Move quality
No significant move (6h)

Price was stable over the last 6 hours.

Rule clarity
100 · Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear

underwriting_v1.4 · computed Oct 2, 2026

5. What are the official 2026 hantavirus risk assessments from the WHO and ECDC following the contained cruise ship outbreak?

Reported Cases (according to some sources)13 cases (12 confirmed, 1 probable) [1][2][3]
Reported Deaths (according to some sources)Three deaths [1][2][3]
Prediction Market Probability (as of Sep 1, 2026)Approximately 4% [4][5][6]
Some reports describe a contained 2026 Andes hantavirus cruise ship outbreak. Specific sources indicate an outbreak on the M/V Hondius, involving 13 cases and three deaths, which the WHO declared contained and over by July 2, 2026 [1][2][3]. During this reported event, the WHO assessed the risk to the global population as low, while the ECDC maintained the risk to the EU/EEA general population as very low [1][2][3].
Other sources, however, do not corroborate any 2026 hantavirus outbreak. Another set of provided sources indicates no evidence of a 2026 cruise ship hantavirus outbreak, nor any corresponding WHO or ECDC risk assessments concerning such an event [7][8][9][10][11][12][13][14][15][16][17][18][19][20]. As of September 1, 2026, listed climate and weather monitoring organizations indicate normal operations [7][8][9][10][11][12][13][14][15][16][17][18][19][20].
A prediction market assesses the likelihood of a 2026 hantavirus pandemic. For the prediction market "Hantavirus pandemic in 2026?", resolution to "Yes" requires the WHO to explicitly characterize a hantavirus event as a "pandemic" [4][5][6]. As of September 1, 2026, the market consensus prices this probability at approximately 4%, reflecting the absence of any pandemic-level characterization by the WHO [4][5][6].
Sources (20)
  1. 1Hantavirus outbreak linked to cruise ship travel, Multi-...who.int
  2. 2Andes hantavirus outbreak in cruise ship - ECDC - Europa.euecdc.europa.eu
  3. 3Hantavirus cluster linked to cruise ship travel, Multi-countrywho.int
  4. 4Hantavirus pandemic in 2026? Predictions & Odds | Polymarketpolymarket.com
  5. 5Hantavirus pandemic in 2026? — Prediction Markets | FRCresearchfrc.com
  6. 6Hantavirus Pandemic in 2026: Market Says Almost No Chance | Lines.comlines.com
  7. 7Health Impacts:weather.gov
  8. 82026 Eastern Pacific Hurricane Seasonnhc.noaa.gov
  9. 9Be Weather-Ready for Smooth Sailing on Spring Breakweather.gov
  10. 10Event Summariesweather.gov
  11. 11Event Summariesweather.gov
  12. 12Climatic suitability for the presence and seasonal activity of the Aedes albopictus mosquito for Europe derived from climate projections documentation - Copernicus Knowledge Base - ECMWF Confluence Wikiconfluence.ecmwf.int
  13. 13Anticipating the effects of climate change on public health in the Mediterraneanstories.ecmwf.int
  14. 14Quantifying Heat-Related Health Risk for European Climate Risks Assessments | Destination Earthdestine.ecmwf.int
  15. 15TRIGGER forecast products - Copernicus Services - ECMWF Confluence Wikiconfluence.ecmwf.int
  16. 16Climate Prediction Center - Seasonal Outlookcpc.ncep.noaa.gov
  17. 17Climate Prediction Center - Atlantic Hurricane Outlookcpc.ncep.noaa.gov
  18. 18Climate Prediction Center - Seasonal Outlookcpc.ncep.noaa.gov
  19. 19Probabilistic Hazards Outlookcpc.ncep.noaa.gov
  20. 20Climate Prediction Center - Seasonal Outlookcpc.ncep.noaa.gov

6. What specific viral mutations or environmental triggers in 2026 could escalate hantavirus's pandemic potential?

Hantavirus pandemic potential (2026)Widely agreed as lacking characteristics for a pandemic due to inefficient human-to-human transmission (September 2026) [1][2][3]
MV Hondius outbreak (2026)Genomic sequencing showed no new variants or enhanced transmissibility of Andes virus [4][5][6]
Hantavirus pandemic probability (2026)Very low according to prediction markets [7][1][8][9]
As of September 2026, scientific consensus indicates hantavirus lacks pandemic potential. This conclusion primarily stems from its limited efficient human-to-human transmission [1][2][3]. A 2026 Andes virus outbreak aboard the MV Hondius cruise ship did not alter this assessment, as genomic sequencing confirmed no new variants or heightened transmissibility [4][5][6]. There is no information specifying any viral mutations or environmental triggers in 2026 that could escalate the virus's pandemic threat.
Ecological and environmental factors influence hantavirus spillover, not pandemic escalation. Climate change, biodiversity loss, and increased human encroachment on rodent habitats remain the main contributors to spillover events [10][5][3]. While conditions like windy or dusty periods can increase human exposure to aerosolized virus from rodent droppings [11], research does not explicitly link these to an escalation of pandemic potential. Despite predictions for a strong El Niño through the 2026-27 Northern Hemisphere winter [12][13] and persistent drought and wildfire potential in parts of the United States in summer 2026 [14][15][16], no specific data connects these conditions to an elevated hantavirus pandemic potential [14][15][16]. Prediction markets consistently assign a very low probability to a hantavirus pandemic in 2026, aligning with scientific consensus [7][1][8][9].
Sources (16)
  1. 1Hantavirus Pandemic in 2026: Market Says Almost No Chance | Lines.comlines.com
  2. 2Hantavirus is very different to COVID. Here's why the '...theconversation.com
  3. 3Five things to know about hantavirus from a Stanford Medicine...med.stanford.edu
  4. 4Hantavirus cluster linked to cruise ship travel, Multi-countrywho.int
  5. 5What the Andes hantavirus outbreak reveals about...news.vt.edu
  6. 6Questions and answers on the hantavirus outbreak in a cruise...ecdc.europa.eu
  7. 7Hantavirus pandemic in 2026? Predictions & Odds | Polymarketpolymarket.com
  8. 8Hantavirus pandemic in 2026 91% No · Polymarketexplorer.struct.to
  9. 9Hantavirus pandemic in 2026? — Polymarket implied odds · Polytrackertrackerpoly.com
  10. 10climate, biodiversity, and socio-economic factors as key...sciencedirect.com
  11. 11Health Impacts:weather.gov
  12. 12ENSO: Recent Evolution,cpc.ncep.noaa.gov
  13. 13Synopsis: ENSO-neutral conditions may transition to La Niña cocpc.ncep.noaa.gov
  14. 14Monsoon Outlook_2026Jul9weather.gov
  15. 15National Weather Service Cheyenne - Drought Information Statementweather.gov
  16. 16National Weather Service [WFO Pendleton, OR] Drought Information Statement - August 13, 2026weather.gov

7. How do Andes hantavirus and SARS-CoV-2 compare on key epidemiological metrics like R0 and case fatality rate?

Andes Hantavirus Case Fatality Rate21% to 50% [1][2]
SARS-CoV-2 Case Fatality Rate0.5% to 2% [1][2]
Probability of Hantavirus pandemic (WHO 2026)Approximately 4% [3][4][5]
Andes orthohantavirus has a significantly higher case fatality rate than SARS-CoV-2. The case fatality rate (CFR) for Andes orthohantavirus typically ranges from 21% to 50%, whereas SARS-CoV-2's CFR is generally estimated between 0.5% and 2% [1][2]. In terms of transmissibility, SARS-CoV-2 is considerably more infectious, with an R0 historically estimated around 2.5 [1][6][7].
Andes virus transmissibility remains low due to its zoonotic nature. Primarily a zoonotic disease, sustained human-to-human transmission of the Andes virus is rare [1][6][7]. When it does occur, it is only documented in specific contexts involving close, prolonged contact, often resulting in an effective reproduction number (Rt) below 1.0 [1][6][7].
Hantavirus is unlikely to cause a pandemic, per current predictions. As of September 1, 2026, prediction markets assign a very low probability, approximately 4%, to a Hantavirus pandemic declaration by the WHO in 2026 [3][4][5]. This low probability reflects the epidemiological consensus that Hantavirus lacks the sustained human-to-human transmission pathways necessary for a widespread pandemic [3][4][5].
Sources (7)
  1. 1Hantaviruswho.int
  2. 2Andes virusen.wikipedia.org
  3. 3Hantavirus pandemic in 2026? Predictions & Odds | Polymarketpolymarket.com
  4. 4Hantavirus pandemic in 2026 91% No · Polymarketexplorer.struct.to
  5. 5Hantavirus pandemic in 2026? — Prediction Markets | FRCresearchfrc.com
  6. 6HANTA2026 — MV Hondius Andes Hantavirus Trackerhanta2026.org
  7. 7Comparing SARS-CoV-2 with SARS-CoV and influenza...thelancet.com

8. Which public health agencies, such as the CDC or ECDC, provide regular surveillance reports on global hantavirus cases for 2026?

Global Hantavirus SurveillanceNo regular, dedicated global reports from CDC or ECDC [1][2][3]
2026 Outbreak FocusAndes hantavirus on MV Hondius cruise ship [4][5][6]
Outbreak Containment DateJuly 2, 2026 (WHO) [7]
Public health agencies lack regular, dedicated global hantavirus surveillance reports. Public health agencies, including the U.S. Centers for Disease Control and Prevention (CDC) and the European Centre for Disease Prevention and Control (ECDC), do not issue regular, dedicated global surveillance reports for hantavirus. Instead, the monitoring for hantavirus is integrated into broader epidemiological and vector-borne disease surveillance frameworks [1][2][3].
Global hantavirus surveillance in 2026 was incident-driven. In 2026, hantavirus surveillance was primarily driven by specific incidents, notably an Andes hantavirus outbreak that occurred aboard the cruise ship MV Hondius [4][5][6]. This particular event was closely monitored by the World Health Organization (WHO), the European Centre for Disease Prevention and Control (ECDC), and the U.S. Centers for Disease Control and Prevention (CDC). The WHO officially declared the cruise-related Andes hantavirus outbreak contained and concluded on July 2, 2026 [4][5][6][7].
Current public health surveillance prioritizes other hazards over hantavirus. As of September 2026, public health and meteorological surveillance efforts, including those by the CDC, prioritize hazards such as extreme heat and well-established vector-borne diseases like those transmitted by mosquitoes [8][9][2][10][11]. While European and international public health organizations utilize climate and weather data to develop decision support systems and risk models for predicting vector-borne disease outbreaks, these tools are predominantly aimed at mosquito-borne illnesses rather than hantavirus reservoirs such as rodents. Although hantavirus transmission can have indirect associations with weather phenomena like windy or dusty conditions, these are not the main focus of weather-based public health forecasting models [1][12][13].
Sources (13)
  1. 1Anticipating the effects of climate change on public health in the Mediterraneanstories.ecmwf.int
  2. 2NWS-CDC Partners and Users Heat Webinarweather.gov
  3. 3Development of a cloud-accessible application to bring meteorological data to users in public health sector in Englandevents.ecmwf.int
  4. 4Hantavirus cluster linked to cruise ship travel, Multi-countrywho.int
  5. 52026 Hantavirus Outbreak: Testing for Potential Infectioncdc.gov
  6. 6High Priority: Hantavirus Infection in the United States...coronavirus.kdheks.gov
  7. 7Andes hantavirus outbreak in cruise ship - ECDC - Europa.euecdc.europa.eu
  8. 8Week-1 Valid: 03 June 2026 – 09 June 2026 Week-2 Valid: 10 June 2026 – 16 June 2026cpc.ncep.noaa.gov
  9. 9July 9, 2026 – July 15, 2026cpc.ncep.noaa.gov
  10. 10Probabilistic Hazards Outlookcpc.ncep.noaa.gov
  11. 11August 2026 – October 2026weather.gov
  12. 12Climatic suitability for the presence and seasonal activity of the Aedes albopictus mosquito for Europe derived from climate projections documentation - Copernicus Knowledge Base - ECMWF Confluence Wikiconfluence.ecmwf.int
  13. 13Health Impacts:weather.gov

9. How do the confirmed 2026 U.S. hantavirus case counts from the CDC compare to historical annual averages?

Current US Hantavirus CasesNo confirmed cases (as of September 1, 2026) [1][2][3]
Historical Annual Average US CasesApproximately 28 to 30 cases per year [4][5][6]
Probability of 2026 Hantavirus Pandemic2% to 6% [7][8][9]
U.S. hantavirus cases in 2026 remain significantly below average. As of September 1, 2026, official reports do not yet list any confirmed hantavirus cases in the United States [1][2][3]. This figure is considerably lower than the historical annual average, which typically registers between 28 and 30 cases per year. Since surveillance commenced in 1993, a total of 890 laboratory-confirmed hantavirus cases have been recorded over an approximately 31-year period [4][5][6].
Monitoring continues for hantavirus, a rare, often fatal illness. Ongoing monitoring is in place, partly related to a May 2026 cruise ship outbreak of the Andes virus, though the United States has not yet reported any confirmed hantavirus cases [1][2][3]. Hantavirus cardiopulmonary syndrome (HCPS) is a rare but frequently fatal illness, commonly transmitted through exposure to deer mouse droppings, with airborne inhalation of the virus being a primary mode of transmission in windy or dusty conditions [10].
A hantavirus pandemic in 2026 remains highly improbable. Prediction markets, such as Polymarket, indicate a very low probability, between 2% and 6%, for a hantavirus pandemic occurring in 2026 [7][8][9]. This market consensus suggests that such an event is highly unlikely, primarily due to the absence of human-to-human transmission in endemic hantavirus strains and the rapid containment observed in previous clusters [7][8][9].
Sources (10)
  1. 1Transcript - Update on CDC's Hantavirus Response 5/14/...cdc.gov
  2. 22026 Hantavirus Outbreak: Testing for Potential Infectioncdc.gov
  3. 3CDC says there are no U.S. hantavirus cases currently, 41...cnbc.com
  4. 42026 Multi-country Hantavirus Cluster Linked to Cruise Shipcdc.gov
  5. 5Reported Cases of Hantavirus Diseasecdc.gov
  6. 6Here's Where Hantavirus Has Historically Occurred in the...medpagetoday.com
  7. 7Hantavirus pandemic in 2026? Predictions & Odds | Polymarketpolymarket.com
  8. 8Hantavirus Pandemic in 2026: Market Says Almost No Chance | Lines.comlines.com
  9. 9https://polymarket.com/event/hantavirus-pandemic-in-2026?r=slavik002polymarket.com
  10. 10Health Impacts:weather.gov

10. What Could Change the Odds

Key Catalysts

The narrative of a Hantavirus pandemic in 2026 stems from a viral social media post from 2022, which gained traction after a hantavirus cluster occurred on a cruise ship in May 2026 [1][2][3][4]. Global health authorities, including the WHO and CDC, have consistently characterized the risk of the recent Andes hantavirus outbreak as low, noting that hantavirus typically does not spread easily between humans [1][2][5][4]. As of September 2026, prediction markets such as Polymarket, Manifold, and PredictHanta treat the likelihood of a pandemic declaration as extremely low, often cited at or below 2-4% [6][7][8][9].
The May 2026 cruise ship outbreak on the M/V Hondius involved the Andes virus (ANDV), a rare strain known for potential, though limited, person-to-person transmission [10][5][11][12]. This event resulted in a small number of confirmed cases and deaths, all contained within the cruise ship context [10][5][11][12]. No official reports or forecasts from health authorities mention a Hantavirus pandemic for 2026 or 2027 [13][14]. Hantavirus transmission typically occurs through exposure to virus-contaminated droppings, often facilitated by dusty or windy conditions [13][14].
Separately, as of September 1, 2026, climate models and the National Weather Service indicate a very strong El Niño event is strengthening [15][16][17]. There is a 97% probability of its persistence through early spring 2027 and an 81% chance of reaching very strong intensity during October-December 2026 [15]. While the incidence of diseases like hantavirus is historically linked to environmental and monsoon variability, meteorological organizations monitor these patterns but do not issue pandemic predictions for hantavirus [13][14].

Key Dates & Catalysts

  • Closes: January 01, 2027
Sources (17)
  1. 1Hantavirus stirs vaccine skeptics, Moderna questions, prediction conspiracy - Newsweeknewsweek.com
  2. 2Hantavirus brings back old conspiracy theories: It’s not a new pandemic, nor a mystery virus, nor cured with zinc | Health | EL PAÍS Englishenglish.elpais.com
  3. 3Staged claims and Israeli hoaxes: Debunking viral conspiracy theories about hantavirus | Euronewseuronews.com
  4. 4Hantavirus outbreak isn't another Covid pandemiccnbc.com
  5. 52026 Hantavirus Outbreak: Testing for Potential Infectioncdc.gov
  6. 6Hantavirus Pandemic 2026-2027? | Manifoldmanifold.markets
  7. 7Hantavirus pandemic in 2026? Predictions & Odds | Polymarketpolymarket.com
  8. 8All Hantavirus Prediction Markets — 2026 Outbreak · PredictHantapredicthanta.com
  9. 9Hantavirus Prediction Market & Andes Outbreak Trackerpredicthanta.com
  10. 10Hantavirus cluster linked to cruise ship travel, Multi-countrywho.int
  11. 11Hantavirus Outbreak 2026hopkinsmedicine.org
  12. 12Andes Hantavirus Outbreak on a Cruise Ship, 2026nejm.org
  13. 13Health Impacts:weather.gov
  14. 14The North American Monsooncpc.ncep.noaa.gov
  15. 15Climate Prediction Center: ENSO Diagnostic Discussioncpc.ncep.noaa.gov
  16. 16August 2026 – October 2026weather.gov
  17. 17Autumn 2026 _ Winter 2026-2027 Climate Outlook - Google Slidesweather.gov