We have a very different upper pattern setting up to end this week compared to the same time last week. There are several aspects to consider. 1) the system crossing the Southern Plains into the Southeast now that will keep showers and thunderstorms going from Dallas to Atlanta next several days but it’s 2) the bigger system approaching the West Coast that really has our attention.
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The West Coast system looks to slide underneath a positive height field over southwest Canada and the Northern Plains, becoming a potent cut off low. This will pump 3) a monster ridge up into the Great Lakes and Ontario bringing a solid 30-60 degree difference in daytime maximums this weekend compared to last.
Now, feature 1) remains near stationary over the Southeast while the bowling ball low slides across the Four Corners, this sets the stage for two things given that it will plug Gulf moisture, 1) blast Denver and the Front Range in a major snowstorm as well as present a major rain event for Texas but it’s that No.1 system which holds back the height field over the Southeast from rising and so the high explodes up over the Great Lakes. Somewhat cooler with chance of thunderstorms over Southeast.
While fine, dry and warm further north but without a true southern connection, warming within the huge Great Lakes ridge appears limited.
TOP IMAGE CREDIT: Michael Green
Check out the snow amounts projected by the ECMWF.
Credit: AccuWeather Pro
The ECMWF 500mb height snapshots through the next 5 days depicts nicely how the atmosphere is going to behave.
Credit: AccuWeather Pro
Credit: AccuWeather Pro
Credit: AccuWeather Pro
Here’s the height anomalies.
Credit: AccuWeather Pro
Credit: AccuWeather Pro
Credit: AccuWeather Pro
Credit: AccuWeather Pro
See this morning’s video.
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