Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
357 AM EDT Fri Oct 30 2026

Valid 12Z Fri Oct 30 2026 - 12Z Sun Nov 01 2026

...Heavy rainfall continues across parts of the Plains today;
threat increasing over the West this weekend...

Tropical moisture streaming northward ahead of a West Coast upper-
low will maintain the heavy rainfall threat over portions of the
Plains and Desert Southwest today. Over the next 6-12 hours,
localized to scattered instances of flash flooding remain possible
over portions of the Central and Southern Plains as slow moving
showers and thunderstorms gradually lift northeastward today. The
flow will gradually shift eastward with showers and thunderstorms
extending into the rest of the Plains and the Lower Mississippi
Valley on Saturday as it interacts with a frontal boundary draped
across the region. To the east, a returning warm front and
inverted trough will drive an uptick in thunderstorms and isolated
flash flooding potential along the east coast of Florida on
Sunday.

Meanwhile, thunderstorms in western Arizona are expected to expand
later this afternoon with the approach of a shortwave from the
southwest. Much of this region is highly susceptible to rainfall
given how wet it has been lately, and the approach of a moisture-
laden Pacific system during the closing hours of Halloween is all
tricks and no treats. Scattered flash flooding is anticipated over
central Arizona tomorrow, before the heavy rainfall threat ramps up
over the Four Corners on Sunday.

Over the Sierra and Great Basin, snowfall will expand late
tomorrow and Sunday as the West Coast upper-low and the approaching
Pacific system interact. Over a foot of snowfall could result in
the peaks of the terrain through late Sunday.


Asherman/Santorelli


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

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