Prognostic Meteorological Discussion
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000
FXUS01 KWBC 221907
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
306 PM EDT FRI AUG 22 2014

VALID 00Z SAT AUG 23 2014 - 00Z MON AUG 25 2014

...HEAVY RAINFALL IS EXPECTED OVER PORTIONS OF THE NORTHERN
ROCKIES INTO THE NORTHERN AND CENTRAL PLAINS WITH MUCH COOLER
TEMPERATURES...

...SOME SNOW IS POSSIBLE AT THE HIGHER ELEVATIONS OF THE NORTHERN
ROCKIES...

...HEAT AND HUMIDITY TO CONTINUE OVER THE SOUTHERN PLAINS, LOWER
MISSISSIPPI VALLEY INTO THE SOUTHEAST...

...SUN AND CLOUDS AND A FEW SHOWERS WHILE MILD TEMPERATURES
PREVAIL ACROSS THE NORTHEAST AND MIDDLE ATLANTIC STATES...

A DEEPENING UPPER LEVEL TROUGH OVER THE NORTHWESTERN US IS
EXPECTED TO BRING A PROLONGED PERIOD OF SHOWERS AND
THUNDERSHOWERS, FOLLOWED BY COOLER TEMPERATURES AND MODERATE TO
HEAVY RAINFALL ACROSS THE NORTHERN ROCKIES INTO PARTS OF THE
NORTHERN AND CENTRAL PLAINS.  HEAVIEST RAINS ARE EXPECTED TO FALL
ACROSS MONTANA INTO THE DAKOTAS, WHERE SEVERAL INCHES ARE LIKELY
THROUGH THE WEEKEND INTO MONDAY. LOW PRESSURE IS EXPECTED TO
CONSOLIDATE INTO A PRETTY SIGNIFICANT STORM SYSTEM THAT WILL MOVE
ACROSS THE NORTHERN PLAINS OVER THE WEEKEND BEFORE HEADING
NORTHEASTWARD INTO SOUTH CENTRAL CANADA. COOLER TEMPERATURES ARE
EXPECTED ACROSS THE ENTIRE REGION AS CANADIAN AIR IS DRAWN
SOUTHWARD BEHIND THE DEVELOPING LOW. THERE IS EVEN THE POSSIBILITY
OF SOME SNOW IN THE HIGHER ELEVATIONS OF THE ROCKIES IN MONTANA
AND WYOMING AS WELL.

HOT AND HUMID CONDITIONS RESPONSIBLE FOR HEAT ADVISORIES ACROSS
PARTS OF THE SOUTHERN AND CENTRAL PLAINS, THE MID MISSISSIPPI
VALLEY AND INTO PARTS OF THE SOUTHEAST WILL CONTINUE FOR THE NEXT
FEW DAYS WITH TEMPERATURES MOSTLY IN THE 90S AND A FEW READINGS
MAY TOP 100 DEGREES WITH HIGH HUMIDITY.  THE HEAT IS NOT EXPECTED
TO SPREAD EASTWARD, HOWEVER, AS A BACK DOOR COLD FRONT ALONG THE
MIDDLE ATLANTIC COAST SUBSIDES SOUTHWARD WITH COOLING EASTERLY
FLOW EASING THE HEAT ALONG THE SOUTHEAST COAST LATER SATURDAY INTO
SUNDAY.

KOCIN

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





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