683
FXUS01 KWBC 192021
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
321 PM EST TUE NOV 19 2019
VALID 00Z WED NOV 20 2019 - 00Z FRI NOV 22 2019
...HEAVY MOUNTAIN SNOW OVER THE CENTRAL/SOUTHERN ROCKIES AS WELL
AS THE GREAT BASIN/SOUTHWEST AND MODERATE SNOW OVER THE NORTHERN
TIER STATES ALONG THE BORDER WITH CANADA...
...THERE IS A MODERATE RISK OF EXCESSIVE RAINFALL OVER PARTS OF
THE SOUTHWEST...
...THERE IS A CRITICAL RISK OF WILDFIRE SPREADING OVER PARTS OF
NORTHERN/CENTRAL CALIFORNIA...
A DEEP UPPER-LEVEL LOW OVER THE WEST WILL AID IN PRODUCING HEAVY
MOUNTAIN SNOW AND HEAVY LOWER ELEVATION RAIN OVER PARTS OF THE
SOUTHWEST AND INTO PARTS OF THE CENTRAL/SOUTHERN ROCKIES THROUGH
THURSDAY EVENING. THE HEAVY RAIN OVER THE SOUTHWEST WILL PRODUCE
NUMEROUS FLASH FLOODING OF MANY STREAMS AND POTENTIALLY AFFECTING
LARGER RIVES THROUGH THURSDAY MORNING.
LOW PRESSURE OVER THE CENTRAL HIGH PLAINS WILL MOVE NORTHEASTWARD
TO THE GREAT LAKES BY THURSDAY EVENING. THE SYSTEM WILL PRODUCE
RAIN AND SNOW OVER PARTS OF THE CENTRAL/NORTHERN PLAINS INTO THE
UPPER MISSISSIPPI VALLEY/UPPER GREAT LAKES OVERNIGHT WEDNESDAY
INTO THURSDAY EVENING. ELSEWHERE, LIGHT SNOW SHOWERS WILL DEVELOP
OVER PARTS OF THE HIGHER ELEVATIONS OF THE NORTHEAST. IN
ADDITION, WITH A SURFACE HIGH WILL SLIDE SOUTHWARD ACROSS THE
NORTHERN ROCKIES, SETTING UP A FAVORABLE PRESSURE GRADIENT FOR
STRONG NORTHERLY WIND ACROSS PORTIONS OF NORTHERN AND CENTRAL
CALIFORNIA. THE WIND WILL BLOW AT 15-35 MPH WITH HIGHER GUSTS IN
TERRAIN-FAVORED AREAS, WILL BECOME COMMON ESPECIALLY ACROSS THE
CENTRAL VALLEY OF CALIFORNIA AND OTHER TERRAIN-FAVORED AREAS OF
THE REGION. RH VALUES WILL FALL TO AROUND 15% DURING PEAK HEATING
PERIODS - LOCALLY LOWER. WITH DRY FUELS IN PLACE ACROSS THE
REGION, ELEVATED AND CRITICAL WILDFIRE RISK HAVE BEEN ISSUED OVER
THE REGION.
ZIEGENFELDER
GRAPHICS AVAILABLE AT
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page