Prognostic Meteorological Discussion
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FXUS01 KWBC 210754
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
254 AM EST SAT JAN 21 2017

VALID 12Z SAT JAN 21 2017 - 12Z 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...

SCATTERED TO WIDESPREAD RAIN IS FORECAST FOR MUCH OF THE DEEP
SOUTH, SOUTHEAST, TENNESSEE VALLEY AND THE MID-ATLANTIC THIS
WEEKEND AS A SERIES OF UPPER-LEVEL DISTURBANCES MOVE OVERHEAD. A
WARM FRONT IS EXPECTED TO DEVELOP TODAY ACROSS THE OVER THE GULF
STATES AND WILL BE A FOCUS FOR NUMEROUS SHOWERS AND THUNDERSTORMS
THROUGH OVERNIGHT HOURS. IN ADDITION, A LOW PRESSURE SYSTEM WILL
SPIN UP OVER THE SOUTHERN PLAINS - SPREADING SHOWERS AND
THUNDERSTORMS WITH IT AS IT AS IT TRACKS EASTWARD BY SUNDAY
MORNING. PERIODS OF INTENSE RAINFALL MAYBE POSSIBLE ACROSS THE
SOUTH AND MAY INCREASE THE RISK FOR FLASH FLOODING. WPC HAS ISSUED
A SLIGHT RISK OF EXCESSIVE RAINFALL TODAY FOR THE WESTERN GULF
COAST/LOWER MISSISSIPPI VALLEY AND ACROSS THE SOUTHEAST ON SUNDAY.
THE STORM PREDICTION CENTER HAS HIGHLIGHTED MUCH OF THE DEEP SOUTH
AND SOUTHEAST AS HAVING A SLIGHT TO ENHANCED RISK FOR SEVERE
THUNDERSTORMS TODAY- SHIFTING TO THE SOUTHEAST AND SOUTHERN
MID-ATLANTIC REGION ON SUNDAY. PLEASE REFER TO PRODUCTS ISSUED BY
THE STORM PREDICTION CENTER FOR FURTHER DETAILS ON THE SEVERE
WEATHER THREAT.

A SERIES OF PACIFIC STORMS ARE FORECAST TO MOVE ONSHORE; WHICH
WILL KEEP A VAST MAJORITY OF THE WESTERN STATES IN A WET REGIME.
COASTAL RAIN AND MOUNTAIN SNOW WILL INCREASE ACROSS THE REGION BY
THIS EVENING AS A STORM SYSTEM APPROACHES THE WEST COAST. RAIN AND
MOUNTAIN SNOW WILL SPREAD ALONG NEARLY THE ENTIRE WEST COAST
TONIGHT AND INTO SUNDAY. SNOW WILL ALSO SPREAD EXPAND INTO 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.

LIGHT PRECIPITATION WILL BE POSSIBLE THIS WEEKEND ACROSS THE
NORTHERN-TIER STATES
AS A SLOW-MOVING UPPER-LEVEL DISTURBANCE REMAINS IN THE VICINITY.
A MIX OF RAIN, SNOW, SLEET, AND FREEZING RAIN IS POSSIBLE TODAY
FOR PORTIONS OF THE UPPER MIDWEST AND WESTERN GREAT LAKES AND MAY
LINGER INTO SUNDAY.

CAMPBELL


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