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Information from NOAA Storm Prediction Center at this website

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SPC Day 1 Outlook

Updates are issued at 0600 UTC, 1300 UTC, 1630 UTC, 2000 UTC, 0100 UTC - Current UTC time: Dec 16 2018 5:30 am

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Day 2

Categorical Day 1 Outlook

ACUS01 KWNS 160525
SPC AC 160524

Day 1 Convective Outlook  
NWS Storm Prediction Center Norman OK
1124 PM CST Sat Dec 15 2018

Valid 161200Z - 171200Z


A few thunderstorms are expected along the Pacific Coast beginning
this afternoon through late tonight.

A mid- to upper-level trough over the eastern Pacific is forecast to
move into CA/OR by late tonight.  Convective showers and a few
thunderstorms are possible as cooling in the mid levels associated
with the approaching disturbance yields weak instability near the
coastal ranges of central/northern CA northward along the OR/WA
coast.  Elsewhere, high pressure will encompass a large part of the
central and eastern U.S. as a mid-level low moves off the Delmarva
and into the western Atlantic south of Cape Cod.

..Smith/Nauslar.. 12/16/2018


Day 3

Day 4

Largly based on original scripts from Ken True: saratoga-weather.org and Rick Curly: ricksturf.com