Prognostic Meteorological Discussion
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000
FXUS01 KWBC 192013
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
312 PM EST FRI JAN 19 2018

VALID 00Z SAT JAN 20 2018 - 00Z MON JAN 22 2018


...PRECIPITATION MOVING INTO THE SOUTHWESTERN U.S. LATE FRIDAY...

...HEAVY SNOWS POSSIBLE FOR PORTIONS OF THE GREAT BASIN NORTHERN
AND CENTRAL ROCKIES LATE FRI AND SAT...

...STRONG STORM EXPECTED TO DEVELOP OVER THE CENTRAL U.S. ON
SUNDAY...

...UNSETTLED WEATHER TO CONTINUE IN THE NORTHWEST...

...ABOVE NORMAL TEMPERATURES PERSISTING ACROSS THE EAST...

A WELL-DEFINED COLD FRONT AND ITS ASSOCIATED AREA OF PRECIPITATION
WILL CONTINUE TO PUSH SOUTHEAST INTO THE SOUTHWESTERN U.S. LATE
FRIDAY INTO EARLY SATURDAY.  WIDESPREAD PRECIPITATION IS EXPECTED
FROM THE CENTRAL ROCKIES BACK INTO THE SOUTHWESTERN U.S., WITH
HEAVY SNOW ACCUMULATIONS POSSIBLE, ESPECIALLY ACROSS THE MOUNTAINS
OF SOUTHWEST WYOMING, UTAH AND EASTERN NEVADA.  THE FRONT WILL
PUSH FURTHER EAST ON SATURDAY, WITH PRECIPITATION, INCLUDING HEAVY
MOUNTAIN SNOWS, SHIFTING FURTHER EAST ACROSS THE CENTRAL AND
SOUTHERN ROCKIES.

BY SATURDAY NIGHT, EXPECT A STRENGTHENING AREA OF LOW PRESSURE TO
ORGANIZE OVER THE SOUTHERN HIGH PLAINS AND THEN TRACK NORTHEAST,
REACHING EASTERN KANSAS BY LATE SUNDAY.  NORTH OF THE LOW, SNOWS
WILL EXTEND FROM THE ROCKIES INTO THE CENTRAL HIGH PLAINS BY LATE
SATURDAY, SHIFTING FURTHER EAST ON SUNDAY, WITH MODERATE TO HEAVY
SNOWS AND GUSTY WINDS EXPECTED ACROSS PORTIONS OF THE CENTRAL
GREAT PLAINS INTO SOUTHERN SOUTH DAKOTA AND SOUTHERN MINNESOTA BY
LATE SUNDAY.

FURTHER SOUTH AND AHEAD OF THE LOW`S TRAILING COLD FRONT, EXPECT
SHOWERS AND THUNDERSTORMS TO DEVELOP, INCREASING IN COVERAGE AND
INTENSITY ACROSS EASTERN OKLAHOMA AND TEXAS INTO THE MID AND LOWER
MISSISSIPPI VALLEY SUNDAY AFTERNOON AND EVENING.

EXPECT THE NORTHWEST TO REMAIN UNSETTLED THROUGH THE PERIOD.
INITIALLY, A WEAKENING LOW LINGERING NORTH OF VANCOUVER ISLAND
WILL CONTINUE TO SUPPORT PRECIPITATION AND WINDY CONDITIONS ACROSS
WESTERN WASHINGTON AND OREGON INTO SATURDAY.  THEN THE NEXT
FRONTAL SYSTEM IS EXPECTED TO MOVE ONSHORE SUNDAY, BRINGING
ANOTHER ROUND OF WIDESPREAD PRECIPITATION TO THE NORTHWESTERN
U.S., INCLUDING PORTIONS OF NORTHERN CALIFORNIA AND THE NORTHERN
ROCKIES.

TEMPERATURES ACROSS THE WESTERN U.S. WILL REMAIN LARGELY AT OR
BELOW NORMAL FOR MOST AREAS WEST OF THE CONTINENTAL DIVIDE THROUGH
THE PERIOD. BY SUNDAY, EXPECT THESE COLD TEMPERATURES TO EXTEND
EAST ACROSS THE ROCKIES AND INTO THE HIGH PLAINS.

FURTHER EAST, ABOVE NORMAL TEMPERATURES WILL PREVAIL THROUGH THE
WEEKEND FROM THE LOWER PLAINS AND MISSISSIPPI VALLEY ACROSS THE
EASTERN U.S.  IN MANY LOCATIONS, TEMPERATURES ARE EXPECTED TO
REMAIN 10-20 DEGREES ABOVE THEIR CLIMATOLOGICAL NORMS.

PEREIRA

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




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