Prognostic Meteorological Discussion
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144
FXUS01 KWBC 200757
PMDSPD

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

VALID 12Z FRI JAN 20 2017 - 12Z SUN JAN 22 2017

...SEVERE THUNDERSTORMS POSSIBLE FOR PORTIONS OF THE GULF COAST
STATES...

...HEAVY SNOW POSSIBLE FOR THE CALIFORNIA MOUNTAINS AS WELL AS THE
MOGOLLON RIM AND PORTIONS OF THE CENTRAL AND SOUTHERN ROCKIES...

STRONG TO SEVERE THUNDERSTORMS WILL BE POSSIBLE ACROSS MUCH OF THE
SOUTH THIS WEEKEND AS A WARM FRONT AND AN UPPER-LEVEL DISTURBANCE
FROM PORTIONS OF THE GULF COAST AND SOUTHEAST TO THE OHIO VALLEY
AND PORTIONS OF THE GREAT LAKES. THE STORM PREDICTION CENTER HAS
HIGHLIGHTED MUCH OF THE LOWER MISSISSIPPI VALLEY HAS HAVING SLIGHT
TO ENHANCED RISKS FOR SEVERE STORMS ON THROUGH SATURDAY. THE THESE
THREATS WILL SHIFT EASTWARD TO THE EASTERN GULF STATES 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.

MUCH OF THE WESTERN STATES WILL REMAIN IN AN ACTIVE WET PATTERN
THROUGH THE WEEKEND AS A PACIFIC FRONTAL SYSTEM MOVES INLAND.
WIDESPREAD RAIN AND MOUNTAIN SNOW WILL SPREAD FROM COASTAL AREAS
TO THE INTERIOR WEST, GREAT BASIN AND ALONG THE ROCKIES. HEAVY
SNOW WILL BE POSSIBLE THROUGH SATURDAY MORNING FOR THE MOUNTAINS
IN CALIFORNIA AND FROM THE MOGOLLON RIM TO THE CENTRAL AND
SOUTHERN ROCKIES. THE INTENSITY OF THE PRECIPITATION WILL STEADILY
INCREASE LATE SATURDAY AFTERNOON INTO THE EVENING HOURS ACROSS
CALIFORNIA AND THE PACIFIC NORTHWEST COASTAL AREAS AS ANOTHER
FRONTAL SYSTEM APPROACHES. EXCESSIVE RAINFALL WILL BE POSSIBLE
ACROSS PORTIONS OF CALIFORNIA; WHERE FORECAST 3-DAY TOTALS MAY
RANGE FROM 3 TO 8 INCHES PRIMARILY ALONG THE COAST AND THE
MOUNTAINS, WITH ISOLATED AMOUNTS NEAR 10 INCHES IN THE SIERRAS.

CAMBPELL


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