March 2025 - Page 9 of 10 - Climate Impact Company

News

03/04/2025, 4:24 am EST

U.S. Gas Population Weight HDD: Coldest Since 2013-14 and 11th Coldest of this Century

According to NOAA, the U.S. gas population weight HDD total for DEC/JAN/FEB 2024-25 was 2637 HDD ranking just-finished winter as the coldest since 2013-14 and 11th coldest of this century. Interestingly, the top 10 coldest U.S. winter seasons of this century all occurred by winter of 2013-14.

03/03/2025, 4:24 pm EST

Why Was JAN/FEB 2025 Colder than Expected?

Of course, the explanation is complex. But, in my view, a large contribution to the unexpected cold pattern occurring mid-to-late meteorological winter across the U.S. was caused by the poleward latent heat release (caused by seasonality) across the record warm northern hemisphere oceans last mid-to-late autumn.

03/03/2025, 1:04 pm EST

Stratospheric Warming FINALLY Produces Colder Model Run

Today’s 12Z GFS forecast is the first to show a sprawling colder and stormy look since stratospheric warming conditions were in the forecast. At midday, the 12Z GFS reveals an evolving central North America longwave trough. The polar vortex shifts from the coast of Northeast Canada to Hudson Bay.

03/03/2025, 12:59 pm EST

La Nina Modoki Analogs

A rarely observed La Nina Modoki has developed in the central equatorial Pacific Ocean. Climate Impact Company identifies Modoki using the ENSO West-East Inex (WEI) which simply compares SSTA in the Nino4 region near the Dateline and the Nino3 region in the eastern equatorial Pacific away from the moderating effects on SSTA caused by proximity to land off the northwest coast of South America (where the Nino12 SSTA region is located). The La Nina Modoki index is -0.9C for the month of February and the daily index has jumped to -1.23C.