Larry Cosgrove still set on a return of winter…
“A wake-up call for those who thought winter is over….”https://clearskyweather.com/2024/02/05/ ... r-is-over/“The emergence of a triple blocking scenario on all of the numerical models, consistently, for the past seven days is an alert that what once was a benign weather pattern across North America is about to turn into something that is by turns stormy and a lot colder. When you see high latitude ridges across Alaska, far northern Canada and Greenland all at the same time, then cold pooling and a suppressed jet stream are just around the corner. Incredibly, the strongest portion of the upper flow will be forced to drop into Mexico, through the Florida Keys, then up along and off of the Atlantic shoreline. The interior of the continent gets treated to air mass that drop out of the Yukon and Northwest Territories (and sometimes originating on the Siberian side of the North Pole). This is the formula you need at this time of year, to counteract the rising sun angle. The critical time frame for a colder outlook (with the snow and cold across the Intermountain Region subsiding) looks to be February 12 to March 7.
There is still enough of an El Nino episode to juice the disturbances that are embedded within the southern branch flow. While cooler readings are seen around the Galapagos Islands, sectors 4 and 3.4 are still warm, and will have an impact on the atmospheric circulation. As the cyclonic energy rides along the rim of the cold air mass, precipitation potential will increase. And with cPk and cA regines involved, ultimately so will the chance for snow and ice. You might call this set-up the “last best chance for winter weather in the lower latitudes and East Coast”, since the analogs see the chances for widespread cold breaking up after the first week of March. The snow risks will start to shift into the West again, with a much warmer outlook showing up from the Midwest into the Eastern Seaboard as we march toward calendar Spring.”