Prognostic Meteorological Discussion
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FXUS01 KWBC 210758
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
257 AM EST SUN JAN 21 2018

VALID 12Z SUN JAN 21 2018 - 12Z TUE JAN 23 2018

...HEAVY SNOW AND FREEZING RAIN POSSIBLE FROM THE CENTRAL PLAINS
TO THE UPPER MIDWEST, GREAT LAKES AND NEW ENGLAND...

...HEAVY SNOW POSSIBLE OVER THE CASCADES AND THE ROCKIES...

...HEAVY RAIN POSSIBLE OVER PARTS OF THE PACIFIC NORTHWEST AND
NORTHERN CALIFORNIA...

A FRONT PASSING THROUGH THE CENTRAL AND SOUTHERN ROCKIES TODAY
WILL QUICKLY DEVELOP INTO A ROBUST WINTER STORM SYSTEM
TONIGHT/EARLY MONDAY AS IT MOVES OUT INTO THE CENTRAL AND SOUTHERN
PLAINS. WARM, GULF MOISTURE DRAWN NORTHWARD INTO THIS SYSTEM WILL
HELP PRODUCE WIDESPREAD SNOW FROM THE NORTHERN/CENTRAL ROCKIES TO
THE UPPER MISSISSIPPI VALLEY AND EAST TO THE GREAT LAKES REGION
AND NEW ENGLAND BY TUESDAY. SNOW WILL LIKELY BE HEAVY AT TIMES,
ESPECIALLY ALONG A SWATH FROM NEBRASKA TO WISCONSIN. ALONG AND
NEAR THE FRONT ITSELF, A RELATIVELY NARROW BAND OF FREEZING RAIN
IS EXPECTED TO DEVELOP. BOTH TYPES OF PRECIPITATION WILL LIKELY
HAVE A SIGNIFICANT IMPACT TO TRANSPORTATION THROUGH AT LEAST
TUESDAY. MUCH OF WYOMING, COLORADO, NORTHWEST KANSAS, NEBRASKA,
SOUTHERN SOUTH DAKOTA, IOWA, SOUTHERN MINNESOTA AND NORTHERN
WISCONSIN HAVE WINTER WEATHER ADVISORIES, WINTER STORM WARNINGS OR
WINTER STORM WATCHES IN EFFECT.

SHOWERS AND THUNDERSTORMS ARE EXPECTED ALONG AND AHEAD OF THE
TRAILING COLD FRONT AS IT MOVES EASTWARD THROUGH THE CENTRAL U.S.
PERIODS OF HEAVY RAIN WILL BE POSSIBLE ACROSS THE SOUTH,
ESPECIALLY NEAR THE OZARKS OF ARKANSAS AND MISSOURI. THE RISK FOR
FLASH FLOODING MAY BECOME ELEVATED IN THAT REGION THROUGH MONDAY
MORNING. RAIN WILL SPREAD TO THE EASTERN TENNESSEE AND OHIO
VALLEYS AND THE MID-ATLANTIC MONDAY AND TUESDAY.

THE PACIFIC NORTHWEST AND NORTHERN CALIFORNIA WILL REMAIN IN AN
INCREASINGLY WET PATTERN OVER THE NEXT FEW DAYS AS UPPER-LEVEL
ENERGY MOVES INLAND. RAIN AND HIGHER ELEVATION SNOW WILL SPREAD
FROM MUCH OF THE PACIFIC NORTHWEST AND NORTHERN CALIFORNIA TO THE
NORTHERN ROCKIES TODAY- EXPANDING INTO PARTS OF THE GREAT BASIN BY
MONDAY. HEAVY SNOW IS FORECAST FOR THE CASCADES, AS WELL AS,
PORTIONS OF THE NORTHERN AND CENTRAL ROCKIES. WINTER STORM
WARNINGS AND WINTER WEATHER ADVISORIES ARE IN EFFECT FROM
NORTH-CENTRAL WASHINGTON TO NORTHERN CALIFORNIA.

CAMPBELL


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




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