Prognostic Meteorological Discussion
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000
FXUS01 KWBC 252000
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
400 PM EDT SUN JUN 25 2017

VALID 00Z MON JUN 26 2017 - 00Z WED JUN 28 2017

...THUNDERSTORMS COULD BE STRONG TO SEVERE FROM THE SOUTHERN
ROCKIES INTO THE SOUTHERN HIGH PLAINS THROUGH TONIGHT...

...THE HEAT OVER THE PACIFIC NORTHWEST WILL ABATE BY TOMORROW...

...MUCH OF THE EASTERN TWO-THIRDS OF THE COUNTRY WILL REMAIN
COOLER THAN NORMAL FOR THE NEXT COUPLE OF DAYS...

A BROAD TROUGH ALOFT WILL CONTINUE TO BE THE DOMINANT FEATURE OVER
THE EASTERN TWO-THIRDS OF THE COUNTRY FOR THE NEXT COUPLE OF DAYS.
 AT THE LOWER LEVELS, A HIGH PRESSURE SYSTEM, REMINISCENT OF A
COLD SEASON ARCTIC OUTBREAK, IS FORECAST TO BUILD SOUTHEASTWARD
ACROSS THE PLAINS AND EASTWARD INTO THE EAST COAST DURING THE NEXT
COUPLE OF DAYS.  THIS WILL KEEP TEMPERATURES MUCH COOLER AND DRIER
THAN NORMAL FROM THE PLAINS EASTWARD TO THE EAST COAST FOR LATE
JUNE.  OVER THE GREAT LAKES INTO NEW ENGLAND HOWEVER, DISTURBANCES
ASSOCIATED WITH REINFORCING SHOTS OF COOL AIR FROM CANADA WILL
KEEP A GOOD CHANCE OF SHOWERS AND THUNDERSTORMS AROUND THROUGH
MONDAY BEFORE TAPERING OFF GRADUALLY FROM WEST TO EAST ON TUESDAY
AS THE BROAD UPPER TROUGH WEAKENS.  THE DISTURBANCES WILL ALSO
HELP THE FORMATION OF SECONDARY COLD FRONTS ALONG THE EAST COAST,
WHICH IS PRETTY UNUSUAL FOR LATE JUNE.

ALONG THE SOUTHERN FLANK OF THE COOL AIR MASS, A STATIONARY FRONT
WILL LINGER FROM ALONG THE SOUTHEAST U.S. COAST DOWN TO THE GULF
COAST.  THE FRONT WILL PROVIDE A FOCUS FOR SCATTERED SHOWERS AND
THUNDERSTORMS, ESPECIALLY DURING THE AFTERNOON AND EVENING. SEVERE
THUNDERSTORMS AS WELL AS HEAVY RAINFALL WILL BE POSSIBLE WITH
THESE STORMS FROM THE SOUTHERN ROCKIES OF NEW MEXICO AND PORTIONS
OF THE ADJACENT HIGH PLAINS. FARTHER EAST, THE SAME FRONTAL
BOUNDARY WILL ALSO PRODUCE SCATTERED TO NUMEROUS SHOWERS AND
THUNDERSTORMS ALONG THE GULF COAST AND ACROSS EASTERN PORTIONS OF
THE CAROLINAS TODAY; LOCALLY HEAVY RAINFALL IS POSSIBLE. FARTHER
NORTH, SCATTERED SHOWERS AND STORMS WILL BE POSSIBLE TODAY FROM
THE UPPER GREAT LAKES TO NEW ENGLAND AS AN UPPER-LEVEL DISTURBANCE
PASSES OVERHEAD. TEMPERATURES ARE FORECAST TO GENERALLY BE BELOW
AVERAGE TODAY AND MONDAY, ESPECIALLY ACROSS THE GREAT LAKES WHERE
HIGHS MAY REMAIN IN THE 60S FOR MANY LOCATIONS.

HIGH PRESSURE AT THE MID AND UPPER-LEVELS WILL PERSIST FOR ANOTHER
DAY ALONG THE WEST COAST, RESULTING IN ANOTHER DAY OF EXTREME HEAT
FOR THE PACFIC NORTHWEST AS WELL AS PORTIONS OF THE SOUTHWEST.
HIGHS TODAY ARE FORECAST TO BE 15 TO 25 DEGREES ABOVE AVERAGE
ACROSS MUCH OF THE NORTHWEST, WITH MANY LOCATIONS REACHING WELL
INTO THE 90S TO EVEN NEAR 100 DEGREES. ACROSS THE SOUTHWEST, THE
HEAT WILL NOT BE AS EXTREME AS IN RECENT DAYS, BUT HIGH
TEMPERATURES ARE NONETHELESS FORECAST TO BE 5 TO 15 DEGREES ABOVE
AVERAGE, WITH MANY AREAS REACHING WELL INTO THE 100S OR 110S. ON
MONDAY, THE UPPER RIDGE WILL MOVE A BIT EAST, RESULTING IN RISING
TEMPERATURES FOR THE NORTHERN ROCKIES, WHILE THE NORTHWEST BEGINS
A GRADUAL COOLING TREND THAT WILL CONTINUE THROUGH THE EARLY
WORKWEEK.

KONG


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

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