959  
FXUS01 KWBC 302000  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
400 PM EDT SUN SEP 30 2018  
 
VALID 00Z MON OCT 01 2018 - 00Z WED OCT 03 2018  
   
..HEAVY RAIN FOR THE DESERT SOUTHWEST DUE IN PART TO ROSA
 
 
...HEAVY RAIN POSSIBLE FOR PARTS OF THE GREAT LAKES AND UPPER  
MISSISSIPPI VALLEY...  
 
...TEMPERATURES WILL BE 10 TO 15 DEGREES BELOW AVERAGE OVER PARTS  
OF THE UPPER MISSISSIPPI VALLEY/UPPER GREAT LAKES...  
 
HEAVY RAINFALL IS SET TO MAKE A RETURN TO MUCH OF ARIZONA AND  
EASTERN CALIFORNIA BY MONDAY AS HURRICANE ROSA TRACKS TOWARDS THE  
NORTHEAST AND REACHES THE REGION IN A MUCH WEAKER FORM IN TERMS OF  
WIND. MOISTURE AHEAD OF ROSA WILL AID IN DEVELOPING SHOWERS AND  
THUNDERSTORMS OVER PARTS OF THE SOUTHWEST/GREAT BASIN AND  
CENTRAL/SOUTHERN ROCKIES OVERNIGHT SUNDAY INTO MONDAY EVENING.  
OVERNIGHT MONDAY THE LOW ASSOCIATED WITH ROSA WILL MOVE INTO THE  
SOUTHWEST AS SHOWERS AND THUNDERSTORMS CONTINUE OVER THE AREA  
THROUGH TUESDAY. SEE THE LATEST ADVISORY FROM THE NATIONAL  
HURRICANE CENTER FOR THE LATEST ON ROSA'S TRACK AND INTENSITY.  
 
MEANWHILE, TROPICAL MOISTURE AND WEAK UPPER-LEVEL IMPULSES WILL  
AID IN PRODUCING SHOWERS AND THUNDERSTORMS OVER PARTS OF THE  
SOUTHWEST AND THE CENTRAL/SOUTHERN APPALACHIANS WESTWARD ACROSS  
THE CENTRAL/WESTERN GULF COAST THROUGH TUESDAY. IN ADDITION, A  
FRONT EXTENDING FROM PARTS OF THE NORTHEAST ROUGHLY SOUTHWESTWARD  
TO THE CENTRAL HIGH PLAINS WILL BE QUASI-STATIONARY THROUGH  
TUESDAY, TOO. SHOWERS AND THUNDERSTORMS WILL DEVELOP ALONG AND  
NEAR THE BOUNDARY FROM PARTS OF THE NORTHEAST TO PARTS OF THE  
CENTRAL PLAINS THAT WILL END OVERNIGHT MONDAY FOR THE CENTRAL  
PLAINS. THE SHOWERS AND THUNDERSTORMS WILL CONTINUE ALONG THE  
BOUNDARY FROM THE MIDDLE MISSISSIPPI VALLEY TO THE NORTHEAST  
THROUGH TUESDAY. IN ADDITION, UPPER-LEVEL ENERGY OVER THE  
NORTHERN INTERMOUNTAIN REGION/NORTHERN ROCKIES WILL MOVE EASTWARD  
TO EASTERN ONTARIO BY TUESDAY MORNING. THE ENERGY WILL AID IN  
RAIN AND HIGHEST ELEVATION SNOW OVER PARTS OF THE NORTHERN ROCKIES  
INTO THE NORTHERN PLAINS THAT WILL MOVE EASTWARD INTO THE UPPER  
MISSISSIPPI VALLEY/NORTHERN ROCKIES BY MONDAY MORNING. THE RAIN  
AND SNOW WILL CHANGE OVER TO ALL RAIN BY MONDAY AFTERNOON. THE  
RAIN WILL MOVE INTO THE GREAT LAKES OVERNIGHT MONDAY INTO TUESDAY  
MORNING.  
 
ELSEWHERE, UPPER-LEVEL ENERGY JUST OFF THE WEST COAST OF CANADA  
WILL MOVE SOUTHWARD AND MERGE WITH AN UPPER-LEVEL LOW OFF THE  
NORTHERN/CENTRAL CALIFORNIA COAST OVERNIGHT MONDAY INTO TUESDAY.  
THE ENERGY AND WEAK ONSHORE FLOW WILL AID IN PRODUCING RAIN OVER  
PARTS OF THE PACIFIC NORTHWEST THROUGH TUESDAY.  
 
ZIEGENFELDER  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
CLICK HERE TO GO TO PREVIOUS BULLETINS.

The Nexlab HPC Page Main Text Page