753  
FXUS02 KWBC 041601  
PMDEPD  
 
EXTENDED FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
1200 PM EDT SAT NOV 04 2017  
 
VALID 12Z TUE NOV 07 2017 - 12Z SAT NOV 11 2017  
 
...GUIDANCE/UNCERTAINTY ASSESSMENT AND WEATHER  
HIGHLIGHTS/THREATS...  
 
A WAVY FRONT TRAILING DOWN FROM THE WRN ATLC TO THE MID-LOWER  
LATITUDES OF THE ERN AND CENTRAL US WILL BE THE FOCUS OF MODERATE  
TO HEAVIER RAINS AND WAVES HAVE SOME POTENTIAL TO FURTHER DEVELOP  
OFF THE EAST COAST.  
 
UPSTREAM...GUIDANCE HAS BEEN STRONGLY TRENDING TO DEVELOPMENT OF  
AN AMPLIFIED CLOSED LOW/TROUGH DIGGING FROM THE GULF OF AK TO THE  
NWRN US INTO MIDWEEK WHOSE ENERGIES ARE SLATED TO EJECT INLAND  
OVER THE WRN US/ROCKIES DAYS 6/7 ALONG WITH ASSOCIATED UNSETTLED  
WEATHER A PCPN ENHANCEMENT. THIS WOULD INCLUDE A ROUND OF PAC  
NW/NRN CA MODERATE TO HEAVY RAINS AND ANOTHER MOUNTAIN/INTERIOR  
WEST TERRAIN ENHANCED THREAT OF HEAVY SNOWS IN A PATTERN WITH  
COOLING POST-FRONTAL TEMPS. SUBSEQUENT HEIGHT FALLS WORKING  
DOWNSTREAM INTO THE PLAINS MAY THEN SPAWN  
FRONTOGENESIS/CYCLOGENESIS AND EVENTUAL FAVORABLE RETURN MOISTURE  
PATTERN FROM THE GULF OF MEXICO/INCREASINGLY WET FLOW BACK INTO  
THE CENTRAL US.  
 
OVERTOP...A SERIES OF DYNAMIC SHIRTWAVES WILL MEANWHILE DIG  
UNDERNEATH A MEAN CLOSED HUDSON BAY LOW AND FORCE SEVERAL SURGES  
OF COLD CANADIAN AIR INTO THE N-CENTRAL AND NERN US TO FURTHER  
REINFORCE A COOLED MID-LATER NEXT WEEK AUTUMN PATTERN. THESE  
SURGES HAVE MODEST PCPN POTENTIAL/MOISTURE...BUT DO OFFER GREAT  
LAKE SNOW POTENTIAL.  
 
SCHICHTEL  
 

 
 
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