Prognostic Meteorological Discussion
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FXUS01 KWBC 210748
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
348 AM EDT SAT OCT 21 2017

VALID 12Z SAT OCT 21 2017 - 12Z MON OCT 23 2017

...UNSETTLED FOR THE NORTHWESTERN U.S. AND PLEASANT FOR THE EAST
COAST STATES THROUGH SUNDAY...

HEAVY RAIN AND HIGH ELEVATION SNOW WILL BE THE MAIN WEATHER STORY
ACROSS THE PACIFIC NORTHWEST AND NORTHERN ROCKIES THIS WEEKEND AS
A STRONG LOW PRESSURE SYSTEM TRACKS EASTWARD ACROSS THE REGION.
THIS ATMOSPHERIC RIVER WILL LIKELY RESULT IN SEVERAL INCHES OF
RAINFALL ACROSS PARTS OF WESTERN OREGON AND WASHINGTON, WITH SOME
LOCATIONS GETTING IN EXCESS OF FIVE INCHES.  SNOW WILL BE HEAVY
FOR THE HIGHER MOUNTAIN RANGES OF THE NORTHERN ROCKIES, AND ALSO
FOR THE NORTHERN CASCADES.

THE COLD FRONT CURRENTLY TRACKING ACROSS THE CENTRAL AND NORTHERN
PLAINS IS EXPECTED TO REACH THE GREAT LAKES REGION AND MISSISSIPPI
RIVER BY SUNDAY EVENING IN ASSOCIATION WITH AN AMPLIFIED UPPER
LEVEL TROUGH.  SEVERE THUNDERSTORMS WILL LIKELY DEVELOP FROM
NORTHERN TEXAS TO IOWA AHEAD OF THE FRONT ON SATURDAY, AND THE
STORM PREDICTION CENTER HAS ADDITIONAL DETAILS ON THIS THREAT.
WITH A WAVE OF LOW PRESSURE DEVELOPING ALONG THIS FRONT OVER THE
LOWER MISSISSIPPI RIVER VALLEY, MOISTURE INFLOW FROM THE GULF OF
MEXICO WILL BE ENHANCED AND THIS COULD LEAD TO AREAS OF HEAVY
RAINFALL FROM EASTERN OKLAHOMA TO MISSISSIPPI.

ELSEWHERE ACROSS THE CONTINENTAL U.S., EXPECT MILD TO WARM WEATHER
TO CONTINUE ACROSS THE EAST WITH WIDESPREAD 70S FOR HIGHS THIS
WEEKEND BEFORE COOLER CONDITIONS ARRIVE NEXT WEEK.  FIRE WEATHER
CONCERNS WILL CONTINUE ACROSS PARTS OF CALIFORNIA OVER THE NEXT
FEW DAYS WITH VERY DRY CONDITIONS AND GUSTY WINDS EXPECTED.

D. HAMRICK


GRAPHICS AVAILABLE AT
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP
$$





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