WSI Seasonal Forecast Archive

Each month WSI releases a seasonal forecast based on the anticipated weather for the next three-month span. Top insurance, risk management companies and financial institutions around the globe trust WSI to deliver easy-to-use, timely and expert weather guidance to help anticipate market volatility, mitigate risk and make critical decisions with confidence. Forecast adjustments are sometimes made as additional data is received; monitor this page frequently for the latest information.

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5/25/2011
WSI Continues to Expect Multiple US Hurricane Landfalls in 2011
Weather Authority Anticipates an “Active-Normal” Season with the Gulf Coast Still Under the Greatest Threat
5/24/2011
WSI Expects a Cool Summer across US Great Lakes & Ohio Valley with Significant Heat Confined to Interior West
Eastern US Coastal Cities Expected to be Slightly Warmer than 30-Year Normal
5/23/2011
Weather Services International: Warm Summer Expected on European Mainland; Below-Normal Temperatures Confined to UK and Norway
Most Significant Warmth Expected Across Eastern Half of Mainland
4/27/2011
WSI: Multiple US Hurricane Landfalls Expected in 2011
Weather Authority Expects Another Active Season with Gulf Coast Under Greatest Threat
4/26/2011
WSI: Recent US Pattern of Below-Normal Temperatures North and Above-Normal South Will Persist into Early Summer, then Reverse During Back Half of Summer
La Nina Continues to Slowly Fade, but No El Nino Expected
4/25/2011
Weather Services International: Warmth to Continue Across Most of European Mainland and UK in May/June; Cooler, Wetter Conditions in UK by Late Summer
Most Significant Summer Warmth Expected Across Southern Mainland, Iberia, and Southeastern Europe
3/22/2011
WSI: Cool Weather Will Still Be Confined to Parts of Northern US during Late Spring and Early Summer
La Nina Impacts Linger as Summer Approaches
3/21/2011
Weather Services International: Cool Weather to Be Generally Confined to Northern Europe During April
Summer Warmth Likely Across the South, Uncertainty about Magnitude and Northward Extent of Above-Normal Temperatures
2/22/2011
WSI: Notably Cold Spring Expected across Northern US; Slightly Warmer than Normal in South-Central & Southeast
Expect Total US Gas Heating Demand During March-May Period To Be 20% More Than Last Year and 3% More Than 1971-2000 Average
2/21/2011
Weather Services International: Eastern European Cold Pattern Likely to Persist into March;
North Atlantic Oscillation to Remain Quiet into March
1/25/2011
WSI: Coldest Temperatures in North-Central and Northwestern US during January-March Period; Slightly Warmer than Normal in Southeast
Expect Total US Gas Heating Demand during February-April Period To Be 7% More Than Last Year and 2-3% More Than 1971-2000 Average
1/24/2011
Weather Services International: Recent Moderation of Extreme Cold to Last into February Followed by Sharp Return to Cold Heading into March
Milder Mid-Winter Period, But More Extreme Cold Likely Late
12/22/2010
WSI: Another Active Hurricane Season in 2011
Weather Authority Also Sees Increased Chances for US Landfall
12/21/2010
WSI: Coldest Temperatures in North-Central and Northwestern US during January-March Period; Quite Mild in South-Central States
Expect Total US Gas Heating Demand during January-March Period to be 1-2% More Than Both Last Year and 30-Year Averages
12/20/2010
Weather Services International: Moderation of Extreme Cold for Europe in January/February; a Colder Turn Again in March
Historic Pattern Likely to Relent Through Mid-Winter, Followed by an Additional Big Chill in Late Winter and Early Spring
12/1/2010
WSI Aces Major Hurricane Forecast Numbers
Weather Authroity Achieves High Marks Overall for Most Recent Set of Seasonal Atlantic Tropical Forecasts
11/23/2010
WSI: Coldest Winter Temperatures in North-Central US; Very Warm in South-Central States
Expect Total US Heating Demand during December-February Period to be 2-10% Less than Last Year and within 1% of 30-Year Averages
11/22/2010
Weather Services International Affirms Forecast: Another Cold Winter for UK & Western Europe, Especially Early, But Less Severe than Last Year
Persistent North Atlantic Oscillation Tempers Impacts of Strong La Nina Event, Suggesting Lower-than-Normal Temperatures
10/26/2010
WSI: Northeast US Cold Early and Late in Winter; More Consistent Cold in North-Central Region; Very Warm in South-Central States
WSI and ESAI Expect Total US Heating Demand during November-January and December-February periods to be within 3% of Last Year and within 1% of 30-Year Averages
10/25/2010
Weather Services International Expects Another Cold Winter for UK & Western Europe, But Less Severe than Last Year
Persistent North Atlantic Oscillation Trumps Impacts of Strong La Nina Event, Suggesting Lower-than-Normal Temperatures
9/22/2010
WSI Expects 2010 Hurricane Season to Finish Strong
Weather Authority Raises Intense Storm Count and Foresees Storm Tracks to be Greater Threat to US for Remainder of Season
9/21/2010
WSI: Warm October Followed by Colder November/December in US
WSI and ESAI Expect Total US Heating Demand during October-December Period to be within 1-2% of Both Last Year and 30-Year Averages
9/20/2010
Weather Services International Expects Warm Northern Europe, Cool Southern Europe
Warm Atlantic and Cold Pacific Suggest Below-Normal Temperatures Will Increase in Areal Coverage as Period Progresses
8/25/2010
WSI Expects a Very Active Remainder of 2010 Hurricane Season
Weather Authority Foresees Very Busy Season with an Increased Northeast US Threat
8/24/2010
WSI: Very Warm Fall Period in Store for Much of the US
WSI and ESAI Expect US Early-Season Heating Demand during September-November Period to Decrease 3% Year-Over-Year
8/23/2010
Weather Services International Expects Warm, Dry Autumn for Scandinavia, UK
Warm Atlantic and Cold Pacific Suggest Mild Period Will End in November
7/21/2010
Relatively Inactive June-July Period Forces Decrease in WSI 2010 Tropical Forecast From 20 to 19 Named Storms
Weather Authority Still Foresees Very Busy Season with an Increased Northeast US Threat
7/20/2010
WSI: US Summer Warmth to Persist Longer than Usual into Fall Season
WSI and ESAI Expect Cooling Demand during August-October Period to Increase 15% Year-Over-Year
7/19/2010
Weather Services International Expects Warm Late Summer for European Mainland and for Scandinavia during the Autumn
Recent Warm, Dry Weather to Continue into August
6/23/2010
WSI Again Increases Its Forecast Numbers for 2010 Hurricane Season
Weather Authority Extends Its Prediction for a Hyperactive Season with an Increased Northeast US Threat
6/22/2010
WSI: Moderate Heat to Build Across the Northern US During Second Half of Summer
WSI and ESAI Expect US Energy Usage during July-September Period to Increase 7-8% Year-Over-Year
6/21/2010
Weather Services International Expects Cool Period for Scandinavia, Northern Mainland and Above-Normal Temperatures for UK, Southern Mainland
Persistence of Negative Phase of North Atlantic Oscillation and Recent Rainfall over European Mainland to Discourage Significant or Sustained Heat
5/26/2010
WSI Raises Its April Forecast Numbers for 2010 Hurricane Season
Weather Authority Predicts Hyperactive Tropical Season with Magnified Northeast US Threat
5/25/2010
WSI US Summer Outlook: Moderate Heat to Build Across Northern States by July/August
WSI and ESAI Expect US Summer Energy Usage to Increase 4-5% Year-Over-Year
5/24/2010
WSI European Summer Forecast: Cool Weather Expected for UK, Scandinavia, Much Warmer Southern Mainland
Quick Transition to La Nina to Keep Heat Away Again
4/21/2010
WSI Significantly Increases Forecast Numbers for 2010 Hurricane Season
Weather Authority Predicts Increased Northeast US Threat During Most Active Season Since Record-Breaking 2005
4/20/2010
WSI: Cool Start, Warm Finish to Summer Across Most of Northern US and Plains
WSI and ESAI Anticipate US Summer Energy Usage To Increase 3-4% Year-Over-Year
4/19/2010
Weather Services International: Another Cool Summer Ahead for UK, Northern European Mainland
Persistence of Negative Phase of North Atlantic Oscillation, Cool Ocean Temperatures to Keep Heat Away Again
3/23/2010
WSI: Warm Temperatures Across Northern US in April/May, Much Cooler June
WSI expects the upcoming period (April-June) to average cooler than normal in the southeastern half of the US, with warmer temperatures in much of the western and northern US, especially in March/April. The WSI seasonal outlooks reference a standard 30-year normal (1971-2000).
3/22/2010
WSI - Europe To Be Cool in April with a Warming Trend Across the North in May & June
WSI expects temperatures for the approaching period (April-June) to average warmer than normal across Scandinavia, UK, and the extreme northern mainland.
2/23/2010
WSI - More Cold Temperatures South and East in March/April, Moderating Temps in the Midwest
WSI and ESAI Expect Total March-May Natural Gas Usage To Increase 4% Year-Over-Year, Further Reducing Gas Inventories
2/18/2010
WSI Expects European Cold to Move Northward in March and Milder Weather to Follow in Spring
WSI Corporation expects temperatures for the approaching period (March-May) to average warmer than normal across all European locations, except for Iberia.
1/27/2010
WSI Predicts 2010 Hurricane Season to be More Active than 2009
In its first hurricane season report for 2010, WSI Corporation calls for 13 named storms, 7 hurricanes and 3 intense hurricanes (category 3 or greater). The 2010 forecast numbers fall between the long-term (1950-2009) averages of 10 named storms, 6 hurricanes, and 3 intense hurricanes and the averages from the more active recent 15-year period (1995-2009) of 14/8/4.
1/21/2010
WSI Calls for Cold February and March in the Eastern US
WSI expects the upcoming period (February-April) to average cooler than normal in the eastern two-thirds of the US, with warmer temperatures in the western US, especially in March/April. The WSI seasonal outlooks reference a standard 30-year normal (1971-2000).
1/20/2010
WSI Expects Bitter Cold to Reappear in February after Brief Respite
WSI expects temperatures for the approaching period (February-April) to average colder than normal across Scandinavia, UK and most of the mainland, with the exception of parts of Iberia and the Mediterranean states.
12/22/2009
WSI Calls for Continuation of Cold Winter Across Much of US, Especially February/March in Northeast
WSI expects the upcoming period (January-March) to average cooler than normal in the entire US, with the exception of areas north and west of a line from Portland, Oregon to Minneapolis. The WSI seasonal outlooks reference a standard 30-year normal (1971-2000).
11/24/2009
WSI Calls for Cold Winter in Eastern US, Especially After New Year
WSI expects the upcoming period (December-February) to average cooler than normal in the eastern and south-central US, with above-normal temperatures common across the western and north-central US. The WSI seasonal outlooks reference a standard 30-year normal (1971-2000).
10/20/2009
WSI Calls for Cold Winter in Eastern US, Especially After New Year
WSI expects the upcoming period (November-January) to average cooler than normal in the eastern and south-central US, with above-normal temperatures common across the western and north-central US. The WSI winter forecast (December-February) shows below-normal temperatures across the eastern and southern US, with above-normal temperatures across the northwestern half of the country. The WSI seasonal outlooks reference a standard 30-year normal (1971-2000).
9/22/2009
WSI Calls for Cold Period in Southeast, most of Central US during October-December Period
WSI expects the upcoming period (October-December) to average cooler than normal in the southeastern and central US, with above-normal temperatures common across the Northeast and Southwest. The WSI seasonal outlooks reference a standard 30-year normal (1971-2000).
8/29/2009
WSI Calls for Warm Period in Western US and Northeast during September-November Period; Cool Southeast
WSI expects the upcoming period (September-November) to average cooler than normal in the southeastern US, with above-normal temperatures common elsewhere. Areas from the Southwest to the Pacific Northwest may be especially warm, compared to historical normals. The WSI seasonal outlooks reference a standard 30-year normal (1971-2000).
8/25/2009
WSI Issues August Update for 2009 Hurricane Season
WSI Corporation’s updated 2009 hurricane season forecast maintains their July outlook for 10 named storms, 5 hurricanes, and 2 intense hurricanes (category 3 or greater). As of this release, there have been 3 named storms (Ana, Bill, Claudette), 1 hurricane (Bill), and 1 intense hurricane (Bill).
7/22/2009
WSI Calls for Continuation of Cool Temperatures in Most of Eastern US; Warm West, during August-October Period
WSI expects the upcoming period (August-October) to average cooler than normal across the eastern half of the US, with above-normal temperatures common across the western US. Areas from the Southwest to the Pacific Northwest may be especially warm, compared to historical normals. The WSI seasonal outlooks reference a standard 30-year normal (1971-2000).
7/21/2009
WSI Issues July Update for 2009 Hurricane Season
WSI Corporation’s updated 2009 hurricane season forecast now calls for 10 named storms, 5 hurricanes, and 2 intense hurricanes (category 3 or greater), a slight reduction from the previous forecast of 11 named storms, 6 hurricanes, and 2 intense hurricanes.
6/24/2009
WSI Calls for Cool Period in Most of Eastern US, Warm West During Remainder of Summer
WSI expects the upcoming period (July-September) to average cooler than normal across the eastern third of the US, with above-normal temperatures common across the western US. The highest probability for a cooler-than-normal period is in the Southeast, while the Rockies and Pacific Northwest are most likely to experience above-normal temperatures. The WSI seasonal outlooks reference a standard 30-year normal (1971-2000).
6/23/2009
WSI Issues June Update for 2009 Hurricane Season
WSI Corporation’s updated 2009 hurricane season forecast continues to call for 11 named storms, 6 hurricanes, and 2 intense hurricanes (category 3 or greater).
5/28/2009
WSI and ESAI issue an update of special interest to energy traders
WSI expects the upcoming summer (June-August) to average cooler than normal across most of the eastern US, with above-normal temperatures common across the western US. The highest probability for a cool summer is in the Southeast, while the Southwest, Rockies, and Northwest are most likely to have a warm summer. The WSI seasonal outlooks reference a standard 30-year normal (1971-2000).
5/27/2009
WSI Issues Updated 2009 Hurricane Season Forecast
WSI Corporation’s updated 2009 hurricane season forecast continues to call for 11 named storms, 6 hurricanes, and 2 intense hurricanes (category 3 or greater).
4/22/2009
WSI Calls for Cool Summer in Southeast, Slightly Warmer-than-Normal in Northeast
WSI expects the upcoming three-month period (May-July) to average cooler than normal across parts of the Southeast and north-central US, with above-normal temperatures common across the Northeast and Southwest. WSI also expects the summer period (June-August) to be cool across the Southeast, mid-Atlantic, Ohio Valley, and southern and central Plains, with above-normal temperatures confined to the Rockies and Northeast. The WSI seasonal outlooks reference a standard 30-year normal (1971-2000).
4/20/2009
WSI Issues 2009 Hurricane Season Update
WSI Corporation’s updated 2009 hurricane season forecast now calls for 11 named storms, 6 hurricanes, and 2 intense hurricanes (category 3 or greater).
3/24/2009
WSI Energycast Outlook Calls for Cool Spring in Northern US; Generally Warm South
WSI expects the upcoming three-month period (April-June) to average cooler than normal across much of the northern tier of the US along with parts of the Southeast, with above-normal temperatures across the south-central and southwestern US. The WSI seasonal outlooks reference a standard 30-year normal (1971-2000).

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