Prognostic Meteorological Discussion
Issued by NWS

Current Version | Previous Version | Text Only | Print | Product List | Glossary Off
Versions: 1 2 3 4 5 6

406
FXUS01 KWBC 252025
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
425 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 THAN
NORMAL WITH MOSTLY CLEAR SKIES FROM THE PLAINS EASTWARD TO THE
EAST COAST, MAKING FOR VERY PLEASANT CONDITIONS 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.  NEAR
THE TAIL END OF THE FRONT, THUNDERSTORMS COULD BECOME SEVERE
TONIGHT FROM THE SOUTHERN ROCKIES OF NEW MEXICO INTO THE ADJACENT
HIGH PLAINS UNDER AN UPPER-LEVEL DISTURBANCE.  FARTHER NORTH,
SCATTERED SHOWERS AND STORMS ARE EXPECTED TO FORM AHEAD OF A
SECONDARY FRONT OVER THE CENTRAL PLAINS ON MONDAY.  THE FRONT, OR
A WEAKNESS IN THE HIGH PRESSURE SYSTEM, WILL PUSH TO THE SOUTH AND
EAST, BRINGING THE STORMS FARTHER DOWN INTO THE MID-MISSISSIPPI
VALLEY BY MONDAY EVENING BEFORE SPREADING EASTWARD INTO THE EAST
COAST ON TUESDAY.

OUT WEST, HEAT HAS BEEN THE STORY FOR THE PAST COUPLE OF DAYS OVER
THE PACIFIC NORTHWEST.  A COLD FRONT FROM THE EASTERN PACIFIC IS
FORECAST TO ARRIVE TOMORROW, BRINGING SHOWERS AND THUNDERSTORMS
ACROSS THE INTERIOR MOUNTAINS INTO THE NORTHERN ROCKIES, REACHING
THE NORTHERN HIGH PLAINS BY TUESDAY.  THIS WILL USHER IN THE MUCH
COOLER MARINE AIR BACK INTO THE PACIFIC NORTHWEST, ENDING THE
RECENT HEAT WAVE.  MEANWHILE, THE NORTHERN AND CENTRAL PLAINS WILL
BEGIN TO SEE SHOWERS AND THUNDERSTORMS FORMING NEAR AND AHEAD OF A
WARM FRONT AS A LOW PRESSURE SYSTEM IS FORECAST TO DEVELOP IN THE
NORTHERN HIGH PLAINS.

OVER THE DESERT SOUTHWEST, THE HEAT WILL GRADUALLY ABATE DAY BY
DAY.  HOWEVER, THE RECENT EXTREME HEAT AND DRY CONDITIONS WILL
CONTINUE TO INCREASE FIRE DANGER IN THE AREA.

KONG


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

$$





USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.