Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
327 PM EDT Tue Oct 20 2026

Valid 00Z Wed Oct 21 2026 - 00Z Fri Oct 23 2026

...Nor�easter impacts winding down across portions of the Mid-Atlantic
Coast this week...

...Excessive rainfall impacts return to the Southwest/Four Corners...

A Nor'easter situated off the Mid-Atlantic coastline is forecast to
maintain an offshore northward track over the next 48 hours. As such,
coastal flooding conditions along Mid-Atlantic and Northeast will begin to
improve through Thursday. The National Hurricane Center continues to
monitor this system for subtropical development, although by Thursday
evening this system will curve further out to sea.

Elsewhere, an amplifying upper trough in the East Pacific will tap
tropical moisture as it digs into the Western U.S. this week. This
anomalous moisture will surge northward into the Southwest and Four
Corners region starting Wednesday, when an approaching surface low
pressure system will act as a focus for showers and thunderstorms  capable
of producing scattered flash flooding across Central/Southern California,
the Four Corners, and Desert Southwest. On Thursday, the flash flooding
focus will remain over the Four Corners, although some lingering heavy
rainfall is possible over Southern California.

Temperatures will be below average in the West as the upper-trough and
associated cold front swing through. Meanwhile, a building ridge in the
Central U.S. will promote above average to well above average temperatures
through this weekend. As the Nor'easter pulls away, high temperatures in
the East climb to just above average, although overnight lows near
freezing are possible in parts of the Northeast and New England tonight
and tomorrow.

Asherman/Kebede


Graphics available at
https://www.wpc.ncep.noaa.gov/basicwx/basicwx...

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