Prognostic Meteorological Discussion
Issued by NWS

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FXUS01 KWBC 290715
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
314 AM EDT SAT APR 29 2017

VALID 12Z SAT APR 29 2017 - 12Z MON MAY 01 2017

...SEVERE THUNDERSTORMS AND FLASH FLOODING POSSIBLE FROM PORTIONS
OF THE SOUTHERN PLAINS TO THE MID-MISSISSIPPI AND OHIO VALLEYS...

...HEAVY SNOW POSSIBLE FOR PORTIONS OF THE SOUTHERN/CENTRAL
ROCKIES AND THE ADJACENT HIGH PLAINS...

...ABOVE AVERAGE TEMPERATURES EXPECTED FOR MUCH OF THE EASTERN
U.S...

AN ACTIVE WEATHER PATTERN IS EXPECTED TO PERSIST ACROSS THE
CENTRAL AND EASTERN U.S. THROUGH THE WEEKEND AND INTO EARLY NEXT
WEEK. A FRONTAL BOUNDARY IS FORECAST TO LINGER FROM THE SOUTHERN
PLAINS TO THE MID-MISSISSIPPI AND OHIO VALLEYS AS MULTIPLE WAVES
OF LOW PRESSURE TRAVERSE THE BOUNDARY. A DEEPENING UPPER-LEVEL LOW
MOVING FROM THE ROCKIES INTO THE SOUTHERN PLAINS WILL KEEP DEEP
SOUTHERLY FLOW IN PLACE ACROSS THE CENTRAL U.S., TRANSPORTING
ABUNDANT MOISTURE NORTHWARD FOR PRECIPITATION. AT THE SURFACE, A
LOW PRESSURE SYSTEM IS FORECAST TO STRENGTHEN ACROSS THE SOUTHERN
PLAINS TODAY, MOVING NORTHEASTWARD TO THE MID-MISSISSIPPI VALLEY
BY SUNDAY.

SHOWERS AND THUNDERSTORMS ARE EXPECTED ACROSS A VAST AREA SPANNING
FROM THE SOUTHERN/CENTRAL PLAINS THROUGH THE MISSISSIPPI VALLEY
AND INTO PORTIONS OF TENNESSEE AND OHIO VALLEYS TODAY AND SUNDAY.
HEAVY RAIN MAY RESULT IN FLASH FLOODING FOR SOME AREAS, AND SEVERE
THUNDERSTORMS ARE ALSO POSSIBLE. PLEASE REFER TO PRODUCTS ISSUED
BY THE STORM PREDICTION CENTER FOR FURTHER DETAILS ON THE SEVERE
WEATHER THREAT. FARTHER EAST, SCATTERED SHOWERS AND THUNDERSTORMS
WILL BE POSSIBLE FOR PORTIONS OF THE MID-ATLANTIC REGION SATURDAY
AFTERNOON INTO SUNDAY AS A COLD FRONT APPROACHES. BY MONDAY
MORNING THE FRONTAL SYSTEM  ACROSS THE SOUTHERN PLAINS WILL BEGIN
TO MOVE INTO THE EASTERN U.S., WITH SHOWERS AND THUNDERSTORMS
ACCOMPANYING IT. ON THE WESTERN SIDE OF THE LOW PRESSURE SYSTEM,
HEAVY SNOW IS POSSIBLE FOR SOME AREAS IN THE CENTRAL AND SOUTHERN
ROCKIES AS WELL AS THE ADJACENT HIGH PLAINS. BY SUNDAY NIGHT INTO
EARLY MONDAY, AS THE SURFACE LOW MOVES INTO THE UPPER MIDWEST, A
MIX OF RAIN AND SNOW WILL BE POSSIBLE ON THE NORTHWESTERN SIDE OF
THE SYSTEM ACROSS PORTIONS OF THE NORTHERN PLAINS AND UPPER
MIDWEST.

ELSEWHERE, A WEAKENING FRONTAL SYSTEM WILL BRING RAIN AND HIGH
ELEVATION SNOW SHOWERS TO THE PACIFIC NORTHWEST STARTING LATER
SATURDAY. THE SYSTEM IS FORECAST TO SPREAD SCATTERED RAIN AND SNOW
SHOWERS INTO THE NORTHERN AND PORTIONS OF THE CENTRAL ROCKIES ON
SUNDAY. MUCH OF THE EAST WILL SEE ABOVE AVERAGE TEMPERATURES
THROUGH THE WEEKEND. HIGH TEMPERATURES WILL AVERAGE 10 TO 20
DEGREES ABOVE AVERAGE FOR SOME LOCATIONS.

RYAN


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

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