September 2025 - Climate Impact Company

News

09/30/2025, 2:01 pm EDT

A graph showing the results of a forecast AI-generated content may be incorrect.

09/30/2025, 2:01 pm EDT

North and South America 16-30-day 500 MB Verification

Surprising is overall success of the GFS ENS skill score of forecasting the upper air pattern (using 500 MB anomalies) during the 16-30-day period across both North and South America for the past 30-day, 14-day, and 7-day intervals. Traditionally, the ECM “weeklies” are used to make a “first guess” at the expected weather during this timeframe. ECM rivaled GFS ENS for North America forecasts and finished second to GFS ENS in South America.

09/29/2025, 6:16 am EDT

A map of a storm AI-generated content may be incorrect.

09/29/2025, 6:16 am EDT

Direct Effects from Imelda and Humberto Stay Offshore the East U.S.

Major Hurricane Humberto disrupts steering currents associated with the North Atlantic subtropical ridge tomorrow enabling westerly flow aloft to turn both Humberto and Imelda northeastward away from the U.S. East Coast. Tropical storm force winds affect Bermuda from outer bands of Humberto tomorrow and again later this week as Imelda passes.

09/29/2025, 4:43 am EDT

A map of the weather AI-generated content may be incorrect.

09/29/2025, 4:43 am EDT

Brazil Heat and Dryness Accelerate Drought

The 15-day temperature and precipitation outlook across Brazil reflects the influence of a torrid drought on climate. Centered over the Brazil drought area, the ECM ENS forecasts extreme heat for much of the next 15 days while the rainfall forecast continues to shift into the arid category.

09/28/2025, 12:21 pm EDT

A pie chart with numbers and symbols AI-generated content may be incorrect.

09/28/2025, 12:21 pm EDT

Midwest/Mid-south/Gulf Coast Drought Worsening

The late summer season drought in the Midwest States is strengthening. Dry-to-drought conditions have also developed and are intensifying in the Gulf Coast and Northeast regions. The late summer new drought generation has caused a shift in U.S. regions observing drought from 45% in mid-August to nearly 70% during late September.