Prognostic Meteorological Discussion
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352
FXUS01 KWBC 180725
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
324 AM EDT WED OCT 18 2017

VALID 12Z WED OCT 18 2017 - 12Z FRI OCT 20 2017

...HEAVY RAINFALL EXPECTED ACROSS THE PACIFIC NORTHWEST...

...HEAVY SNOW POSSIBLE ACROSS THE CASCADES AND NORTHERN ROCKIES...

...STORMY WEATHER CONTINUES FOR FLORIDA...


A FRONTAL SYSTEM WILL BEGIN TO APPROACH THE PACIFIC NORTHWEST BY
THIS EVENING. PRECIPITATION WILL INCREASE THROUGHOUT THE DAY AND
INTO TONIGHT. BY THURSDAY, THE STRONG COLD FRONT WILL BEGIN
PUSHING EASTWARD OVER THE PACIFIC NORTHWEST AND TOWARD NORTHERN
CALIFORNIA WITH PRECIPITATION SPREADING FARTHER EAST AS A RESULT.
ONCE THE FRONT MOVES INTO THE CENTRAL GREAT BASIN, RAINFALL WILL
ALSO FOLLOW SUIT; HOWEVER, DUE TO ONSHORE FLOW, SHOWERS AND HIGHER
ELEVATION SNOW WILL CONTINUE ACROSS THE PACIFIC NORTHWEST. THERE
IS A MARGINAL RISK FOR FLASH FLOODING IN WESTERN WASHINGTON AND
NORTHWESTERN OREGON ON THURSDAY AS A RESULT OF THE HEAVY RAINFALL.
ON THURSDAY, SNOWFALL WILL EXPAND THROUGHOUT THE WASHINGTON AND
OREGON CASCADES AND PARTS OF THE NORTHERN ROCKIES--WITH SOME LIGHT
SNOWFALL IN HIGHER ELEVATIONS OF NORTHERN CALIFORNIA. BY FRIDAY,
SNOW WILL CONTINUE ACROSS THE CASCADES AND THROUGHOUT THE NORTHERN
ROCKIES.

A STALLED FRONTAL BOUNDARY WILL LINGER NEAR SOUTH FLORIDA FOR THE
REMAINDER OF THE WEEK. EASTERLY FLOW WILL BRING TROPICAL MOISTURE
ACROSS THE STATE WHILE THE STATIONARY FRONT WILL ACT AS A FOCAL
POINT FOR CONTINUING SHOWERS AND THUNDERSTORMS THROUGH FRIDAY.
MOST THE HEAVY RAINFALL WILL BE CONFINED TO THE ATLANTIC COASTLINE
AND THE SOUTHERN HALF OF FLORIDA--WITH A MARGINAL RISK OF FLASH
FLOODING IS IN PLACE THE CENTRAL ATLANTIC COASTLINE FOR FLORIDA
TODAY.

SHOWERS AND THUNDERSTORMS WILL APPROACH THE MIDDLE AND
SOUTHEASTERN TEXAS COAST BY THURSDAY EVENING. A DISTURBANCE ALOFT
ALONG WITH INCREASING MOISTURE WILL GIVE WAY TO PRECIPITATION THAT
WILL LAST THROUGH FRIDAY. MEANWHILE, HIGH TEMPERATURES IN THE MID
TO UPPER 70S WILL BE POSSIBLE ACROSS THE NORTHERN PLAINS ON
THURSDAY AND FRIDAY--WHICH IS 10-20 DEGREES ABOVE NORMAL FOR THIS
TIME OF YEAR. BECAUSE OF THE WARM AND DRY CONDITIONS, ELEVATED
FIRE WEATHER IS POSSIBLE ON WEDNESDAY AND THURSDAY FOR PORTIONS OF
THE NORTHERN HIGH PLAINS.

REINHART



GRAPHICS AVAILABLE AT
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