weather.gov     
National Weather Service

Prognostic Meteorological Discussion
NWS Homepage
This page is being discontinued on March 12, 2014.
The same data is available at this site. Please update your bookmarks.
Thank you, and we apologize for the inconvenience.
Please send an email to SR-SRH.Webmaster@noaa.gov with any concerns.


Current Version
Previous Version:    01  
[Printable]
563
FXUS01 KWBC 170822
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
422 AM EDT THU APR 17 2014

VALID 12Z THU APR 17 2014 - 12Z SAT APR 19 2014

...SNOW CONTINUES ACROSS THE UPPER MIDWEST...

...SEVERAL STORM SYSTEMS WILL MOVE ACROSS THE PACIFIC NORTHWEST...

...THUNDERSTORMS AND PERIODS OF HEAVY RAINFALL TO IMPACT THE GULF
COAST...


AN UPPER LEVEL LOW IS DRIVING A SURFACE OCCLUDED FRONT ACROSS THE
GREAT LAKES AND UPPER MIDWEST REGION.  THIS IS BRINGING APRIL SNOW
SHOWERS ACROSS THESE AREAS AND SHOWERS IN THE SOUTHERN PORTION OF
THE PRECIPITATION SHIELD.  THE SNOW WILL LIFT NORTH OF THE UPPER
PENINSULA OF MICHIGAN BY THURSDAY AFTERNOON AS THE SURFACE LOW
PROGRESSES INTO CANADA.  THE UPPER LEVEL LOW IS FAIRLY SLOW MOVING
AND WEAKENS AS TIME PROGRESSES; THIS TRANSLATES TO THE SURFACE AS
THE FRONT ALSO WEAKENS. HOWEVER, SHOWERS ARE EXPECTED TO MOVE FROM
THE NORTHERN FRINGE OF THE SOUTHERN PLAINS ON THURSDAY AFTERNOON
ALONG THE COLD FRONT AND MOVE NORTHEAST TOWARDS THE GREAT LAKES BY
FRIDAY MORNING.

THE PACIFIC NORTHWEST CAN EXPECTED SEVERAL STORM SYSTEMS TO IMPACT
THEIR AREA THROUGH THE SHORT TERM PERIOD. BY THURSDAY MORNING, THE
FIRST SYSTEM BEGINS TO APPROACH THE COAST AND WILL GENERATE
SHOWERS ALONG WITH HIGH ELEVATION SNOW.  THERE IS ALSO A
STATIONARY BOUNDARY ALONG THE SURFACE HIGH PRESSURE DIPPING ACROSS
THE PLAINS THAT WILL PROVIDE FOCUS FOR SNOW SHOWERS IN THE
NORTHERN ROCKIES. THE FRONT WILL STRENGTHEN AS THE SURFACE LOW
DEEPENS AS IT MOVES INTO THE INTERMOUNTAIN WEST BY THURSDAY NIGHT.
 A BROAD AREA OF SHOWERS AND THUNDERSTORMS CAN BE EXPECTED AND
PERIODS OF SNOW FOR THE MOUNTAIN RANGES.  BY FRIDAY EVENING,
ANOTHER PACIFIC SYSTEM WILL APPROACH THE PACIFIC NORTHWEST, AND
SHOWERS ONCE AGAIN WILL MOVE ONSHORE.

AN ACTIVE PERIOD OF SHOWERS AND THUNDERSTORMS WILL IMPACT THE GULF
COAST STATES THROUGH THE BEGINNING OF THE WEEKEND.  ON THURSDAY, A
WARM FRONT BEGINS TO LIFT NORTH OVER SOUTH FLORIDA WHICH WILL
BRING THUNDERSTORMS FOR THE SOUTHERN HALF OF THE STATE.  THIS
FRONT WILL MEANDER IN A NORTHERLY DIRECTION THROUGH FRIDAY
EVENING.  WITH DAYTIME HEATING PROVIDING SUPPORT, SCATTERED
SHOWERS AND THUNDERSTORMS WILL BE EXPECTED FOR THE CENTRAL AND
EASTERN GULF COAST STATES.  A SURFACE LOW TAKES SHAPE TO THE SOUTH
OF THE LOUISIANA COAST ON THURSDAY NIGHT AND LIFTS NORTH OVER
NORTHERN FLORIDA BY FRIDAY EVENING.  ALONG THIS SURFACE LOW,
HEAVIER BOUTS OF RAIN AND THUNDERSTORMS ARE EXPECTED AND MAY GIVE
WAY TO POTENTIAL OF FLASH FLOODING.  THE PRECIPITATION WILL BEGIN
TO DIMINISH FOR THE CENTRAL GULF COAST STATES BY FRIDAY EVENING.
MEANWHILE, PRECIPITATION ALONG THE GEORGIA AND CAROLINA COASTLINES
WILL RAMP UP JUST IN TIME FOR THE WEEKEND AS THE LOW CONTINUES ON
ITS NORTHEAST JOURNEY INTO THE ATLANTIC OCEAN.

FANNING


GRAPHICS AVAILABLE AT WWW.WPC.NCEP.NOAA.GOV
$$






U.S. Dept. of Commerce
NOAA National Weather Service
1325 East West Highway
Silver Spring, MD 20910
E-mail: w-nws.webmaster@noaa.gov
Page last modified: May 16, 2007
NATIONAL WEATHER SERVICE: for Safety, for Work, for Fun - FOR LIFE