Several chances of Much-Needed Rainfall and trending Cooler through Halloween

A cold front will bring scattered showers and thunderstorms to our region overnight Monday into the midday hours on Tuesday. The image below (courtesy tropicaltidbits) is from the latest North American Model (NAM) and shows lines of showers and thunderstorms moving northeast out of the mountains into the Washington Area late Monday night through the midday hours on Tuesday.

Temperatures will cool off behind the front and then begin to moderate late in the work week out ahead of the next cold front that may slide through our area next weekend.  The image below shows the latest European 500mb height anomalies (ridges of high pressure in orange and troughs of low pressure in blue):

850mb temperature anomalies (European Ensemble model, image below) show cooler and warmer than average temperatures matching up nicely with the ridges and troughs:

850mb temperature anomalies (Global Forecast System Ensemble models, image below) are in good agreement with the overall pattern shift as a ridge begins to build in across the coast of western North America:

Finally here is a look at the European Ensemble for snowfall accumulation potential through the 6th of November:

A nice snow pack may be setting up across Canada during this time along with several chances for lake effect snow in the Great Lakes states.

The Appalachian mountains of West Virginia northward through Pennsylvania may also get in on some snow showers during this time period.

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