Prognostic Meteorological Discussion
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000
FXUS01 KWBC 201956
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
255 PM EST FRI JAN 20 2017

VALID 00Z SAT JAN 21 2017 - 00Z MON JAN 23 2017

...SEVERE THUNDERSTORMS POSSIBLE THROUGH THE WEEKEND ACROSS
PORTIONS OF THE GULF COAST AND SOUTHEAST...

...HEAVY SNOW POSSIBLE FROM THE HIGHER ELEVATIONS OF CALIFORNIA TO
THE CENTRAL AND SOUTHERN ROCKIES...

PERIODS OF SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS ARE
EXPECTED THROUGH MUCH OF THE WEEKEND FROM PORTIONS OF THE GULF
COAST AND LOWER MISSISSIPPI VALLEY TO THE SOUTHEAST, AS A SERIES
OF UPPER-LEVEL DISTURBANCES MOVE OVERHEAD. ONE ROUND OF SHOWERS
AND THUNDERSTORMS IS EXPECTED BY THIS EVENING ALONG MUCH OF THE
GULF COAST, SPREADING ACROSS PORTIONS OF THE SOUTHEAST OVERNIGHT
INTO SATURDAY MORNING. ON SATURDAY, A WARM FRONT WILL DEVELOP
ACROSS THE REGION, WHICH WILL ONCE AGAIN FOCUS NUMEROUS SHOWERS
AND THUNDERSTORMS THROUGH THE DAY AND INTO THE OVERNIGHT HOURS. A
LOW PRESSURE SYSTEM FORECAST TO TAKE SHAPE ACROSS THE SOUTHERN
PLAINS ON SATURDAY WILL MOVE EAST INTO THE LOWER MISSISSIPPI
VALLEY BY SUNDAY MORNING. THIS SYSTEM WILL BRING YET ANOTHER DAY
OF WIDESPREAD SHOWERS AND THUNDERSTORMS FROM THE LOWER MISSISSIPPI
VALLEY AND GULF COAST TO THE SOUTHEAST. SEVERE THUNDERSTORMS ARE
POSSIBLE THROUGH THE WEEKEND IN ASSOCIATION WITH EACH OF THESE
ROUNDS OF SHOWERS AND STORMS. PLEASE REFER TO PRODUCTS ISSUED BY
THE STORM PREDICTION CENTER FOR FURTHER DETAILS ON THE SEVERE
WEATHER THREAT. RAIN WILL ALSO SPREAD NORTH INTO THE MID-ATLANTIC
REGION BY SUNDAY.

THE WEATHER PATTERN WILL ALSO BE AN ACTIVE ONE ACROSS THE WESTERN
U.S. THROUGH THE WEEKEND, AS A SERIES OF PACIFIC STORMS MOVE
ONSHORE. THE FIRST OF THESE STORM SYSTEMS IS MOVING INTO THE WEST
COAST STATES TODAY, AND WILL BRING RAIN AND THUNDERSTORMS TO AREAS
ALONG THE COAST AS WELL AS IN THE DESERT SOUTHWEST TONIGHT AND
SATURDAY. HEAVY SNOW IS POSSIBLE ACROSS PORTIONS OF THE SIERRAS AS
WELL AS THE MOGOLLON RIM AND THE CENTRAL/SOUTHERN ROCKIES TONIGHT
INTO SATURDAY. THE WEST COAST SHOULD SEE A VERY BRIEF LULL IN
PRECIPITATION DURING THE DAY ON SATURDAY BEFORE ANOTHER MORE
POWERFUL PACIFIC STORM SYSTEM BEGINS TO APPROACH LATE IN THE DAY.
THIS SECOND SYSTEM WILL SPREAD RAIN AND MOUNTAIN SNOW ALONG NEARLY
THE ENTIRE WEST COAST SATURDAY NIGHT INTO SUNDAY. SNOW WILL ALSO
SPREAD ACROSS MUCH OF THE INTERIOR WEST ON SUNDAY. HEAVY SNOW WILL
BE POSSIBLE IN ASSOCIATION WITH THIS SYSTEM ONCE AGAIN ACROSS THE
MOUNTAINS OF CALIFORNIA, AS WELL AS ACROSS PORTIONS OF THE GREAT
BASIN THROUGH SUNDAY. HEAVY RAIN IS ALSO EXPECTED AT LOWER
ELEVATIONS OF CALIFORNIA.

LASTLY, THE NORTHERN PLAINS AND UPPER MIDWEST WILL ALSO SEE THE
POTENTIAL FOR SOME RELATIVELY LIGHT PRECIPITATION TONIGHT THROUGH
THE WEEKEND AS A SLOW-MOVING UPPER-LEVEL DISTURBANCE REMAINS IN
THE VICINITY. A MIX OF RAIN, SNOW, SLEET, AND FREEZING RAIN IS
POSSIBLE TONIGHT THROUGH SATURDAY FROM THE NORTHERN PLAINS TO THE
UPPER GREAT LAKES. SCATTERED LIGHTER PRECIPITATION WILL LINGER
ACROSS THE UPPER MIDWEST INTO SUNDAY, WITH A WINTRY MIX STILL
POSSIBLE.


RYAN


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