Prognostic Meteorological Discussion
Issued by NWS

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FXUS01 KWBC 280709
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
308 AM EDT FRI APR 28 2017

VALID 12Z FRI APR 28 2017 - 12Z SUN APR 30 2017

...SEVERE THUNDERSTORMS AND FLASH FLOODING POSSIBLE FROM PORTIONS
OF THE SOUTHERN PLAINS TO THE OHIO VALLEY...

...HEAVY SNOW POSSIBLE FOR PORTIONS OF THE ROCKIES AND THE HIGH
PLAINS...

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

AN ACTIVE WEATHER PATTERN IS EXPECTED TO PERSIST FROM MUCH OF THE
CENTRAL U.S. INTO THE OHIO VALLEY THROUGH THE NEXT FEW DAYS, WITH
HAZARDS RANGING FROM SEVERE THUNDERSTORMS AND FLASH FLOODING TO
HEAVY SNOW. A FRONTAL BOUNDARY IS FORECAST TO LINGER FROM THE
SOUTHERN PLAINS TO THE MID-MISSISSIPPI AND OHIO VALLEYS INTO THE
WEEKEND 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. SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS ARE
EXPECTED TODAY THROUGH SUNDAY FOR MUCH OF THE SOUTHERN AND CENTRAL
PLAINS, THE MISSISSIPPI VALLEY, AND THE OHIO VALLEY. SEVERE
THUNDERSTORMS AND FLASH FLOODING ARE BOTH POSSIBLE FROM PORTIONS
OF THE SOUTHERN PLAINS TO THE OHIO VALLEY TODAY AND SATURDAY.
PLEASE REFER TO PRODUCTS ISSUED BY THE STORM PREDICTION CENTER FOR
FURTHER DETAILS ON THE SEVERE WEATHER THREAT.

COLD AIR ON THE NORTHWESTERN SIDE OF THE SYSTEM WILL PRODUCE A MIX
OF RAIN AND SNOW FROM THE ROCKIES INTO PORTIONS OF THE NORTHERN
AND CENTRAL HIGH PLAINS TODAY. HEAVY SNOW IS POSSIBLE FOR SOME
AREAS IN THE CENTRAL AND NORTHERN ROCKIES AS WELL AS THE ADJACENT
HIGH PLAINS. AS COLDER AIR SPREADS SOUTH ON SATURDAY, RAIN IS
EXPECTED TO CHANGE TO SNOW ACROSS THE SOUTHERN ROCKIES AS WELL AS
PORTIONS OF THE SOUTHERN HIGH PLAINS, WITH HEAVY SNOW ONCE AGAIN
POSSIBLE FOR SOME AREAS.

ACROSS THE EASTERN U.S., HIGH PRESSURE AT THE MID AND UPPER LEVELS
OF THE ATMOSPHERE WILL SUPPORT WELL ABOVE AVERAGE TEMPERATURES.
HIGH TEMPERATURES TODAY AND SATURDAY ARE EXPECTED TO BE 10 TO 20
DEGREES ABOVE AVERAGE FOR SOME AREAS. A COLD FRONT MAY PRODUCE
SOME SCATTERED SHOWERS AND THUNDERSTORMS ACROSS THE MID-ATLANTIC
REGION SATURDAY AFTERNOON INTO SUNDAY.

RYAN


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

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