989  
FXUS01 KWBC 272001  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
300 PM EST SAT JAN 27 2018  
 
VALID 00Z SUN JAN 28 2018 - 00Z TUE JAN 30 2018  
 
...HEAVY RAIN AND THUNDERSTORMS COULD LEAD TO FLASH FLOODING ALONG  
THE CENTRAL GULF COAST THROUGH TONIGHT...  
 
...HEAVY SNOW THROUGH TONIGHT OVER THE NORTHERN CASCADES INTO THE  
NORTHERN ROCKIES...  
 
...WATCHING FOR THE POTENTIAL OF A COASTAL STORM DEVELOPMENT ON  
MONDAY...  
 
THE UPPER-LEVEL PATTERN IS FORECAST TO BECOME MORE AMPLIFIED  
ACROSS THE U.S. DURING THE NEXT FEW DAYS. THIS WILL FAVOR ARCTIC  
AIR FROM CANADA TO SURGE INTO THE EASTERN U.S. WHILE WARMER AIR IS  
EXPECTED TO OVERSPREAD THE WESTERN U.S. FIRST OF ALL, A COASTAL  
FRONT WITH A WEAK SURFACE LOW PRESSURE CENTER NEAR THE CENTRAL  
GULF COAST HAS BEEN ASSOCIATED WITH CLUSTERS OF HEAVY SHOWERS AND  
THUNDERSTORMS. THIS SYSTEM IS FORECAST TO MOVE GENERALLY  
EAST-NORTHEASTWARD ACROSS THE FLORIDA PENINSULA INTO THE SOUTHEAST  
THROUGH THE REST OF THE WEEKEND, BRINGING A THREAT OF FLASH  
FLOODING ALONG THE CENTRAL GULF COAST TONIGHT. BY MONDAY, IT  
SHOULD CONTINUE TO MOVE OFF THE SOUTHEAST U.S. COAST AND SHOULD  
BEGIN TO MERGE WITH A COLD FRONT ARRIVING FROM THE MID-ATLANTIC.  
COMPUTER MODELS STILL SHOW NOTICEABLE DISAGREEMENT ON HOW FAR OFF  
THE EAST COAST THE STORM WILL INTENSIFY ON MONDAY. NEVERTHELESS,  
A COUPLE OF INCHES OF RAIN IS FORECAST NEAR THE MID-ATLANTIC COAST  
THROUGH MONDAY.  
 
FARTHER INLAND, AS ARCTIC AIR CONTINUES TO FILTER IN FROM CANADA,  
SOME LIGHT SNOW AND SNOW SHOWERS ARE EXPECTED TO SPREAD FROM THE  
MIDWEST INTO THE APPALACHIANS ON MONDAY NEAR A WEAKENING ARCTIC  
COLD FRONT. TEMPERATURES WILL START OUT VERY MILD FOR THE REST OF  
THE WEEKEND ACROSS MUCH OF THE EASTERN U.S. AHEAD OF THE ARCTIC  
FRONT AS MUCH COLDER AIR FILTERS INTO THE NORTHERN PLAINS,  
REACHING THE EAST COAST LATER ON MONDAY.  
 
OVER THE WESTERN U.S., SNOW WILL BE HEAVY THROUGH TONIGHT ACROSS  
THE NORTHERN CASCADES INTO THE NORTHERN ROCKIES AS MOISTURE FROM A  
LOW PRESSURE SYSTEM CURRENTLY MOVING ONSHORE ACROSS THE PACIFIC  
NORTHWEST INTERACTS WITH A STATIONARY ARCTIC FRONT ALONG THE EAST  
SLOPES OF THE NORTHERN ROCKIES. PRECIPITATION SHOULD BECOME LESS  
INTENSE ON SUNDAY AS AN UPPER-LEVEL RIDGE BEGINS TO BUILD  
NORTHWARD INTO THE REGION. BY MONDAY, ANOTHER COLD FRONT IS  
FORECAST TO MOVE INTO THE PACIFIC NORTHWEST WILL A RENEWED AROUND  
OF PRECIPITATION. TEMPERATURE WILL BECOME PROGRESSIVELY MILDER  
ACROSS MUCH OF THE REST OF THE WESTERN U.S. WITH FINE AND DRY  
CONDITIONS AS THE UPPER-LEVEL RIDGE CONTINUES TO BUILD AND BECOMES  
THE DOMINANT FEATURE.  
 
KONG  
 
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