669  
FXUS61 KRLX 042052  
AFDRLX  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE CHARLESTON WV  
352 PM EST WED MAR 4 2015  
   
SYNOPSIS
 
 
WAVES OF LOW PRESSURE ALONG A FRONT PUSHING FARTHER SOUTH OF THE  
AREA...WILL RESULT IN RAIN CHANGING TO SNOW TONIGHT. ARCTIC HIGH  
PRESSURE CUTS OFF THE SNOW LATE THURSDAY INTO THURSDAY NIGHT.  
 

 
   
NEAR TERM /THROUGH THURSDAY/
 
 
345 PM UPDATE...  
UPDATED FFA TO TAKE OUT FAR WESTERN OHIO COUNTIES...THE SNOW MELT  
CONTRIBUTION IS ESSENTIALLY OVER AND RAINFALL RATES ARE  
LIGHT...WITH A TRANSITION TO SNOW EMINENT.  
 
PREV DISCN...  
RELATIVELY MINOR CHANGES MADE TO THE PREVIOUS FORECAST. MODELS  
CONTINUE TO ADVERTISE A SIGNIFICANT RAIN AND FLOODING EVENT TO A  
HEAVY SNOW EVENT FROM NORTHWEST TO SOUTHEAST TONIGHT...CONTINUING  
THE SNOW INTO THURSDAY ESPECIALLY EAST OF THE OHIO RIVER. THERE MAY  
BE A PERIOD OF SLEET AND EVEN FREEZING RAIN BEFORE THE CHANGEOVER.  
CHANGES MADE WERE TO DELAY THE CHANGEOVER FROM RAIN TO WINTRY PRECIP  
BY A COUPLE OF HOURS...AS THE LEADING EDGE OF ARCTIC AIR IS STILL  
OUT IN FAR WESTERN OHIO. WHILE KEEPING WINTER HEADLINES AND CRITERIA  
FOR SNOW ACCUMULATIONS...WE SHIFTED THE AXIS OF HEAVIEST SNOW FROM  
SOUTHEASTERN OHIO INTO WESTERN WEST VIRGINIA...PER MODEL GUIDANCE.  
OTHERWISE...THINGS WIND DOWN FROM WEST TO EAST...BUT VERY COLD  
TEMPERATURES RETURN AS ARCTIC AIR REAPPEARS. TEMPERATURES FALL WELL  
DOWN INTO THE 20S AND EVEN TEENS ...NOT RECOVERING MUCH ON THURSDAY  
WITH THE CLOUDS AND SNOW.  
 

 
   
SHORT TERM /THURSDAY NIGHT THROUGH SATURDAY/
 
 
THE BIG SYSTEM IS EXODUS COME THE START OF THIS PERIOD. SCATTERED  
SNOW SHOWERS IN THE MOUNTAINS GIVEN UPSLOPE FLOW AND UPPER LEVEL S/W  
TROUGH...WANE QUICKLY OVERNIGHT THU NT...AS ARCTIC HIGH PRESSURE  
CUTS OFF THE UPSLOPE FLOW...AND THE S/W TROUGH QUICKLY SCOOTS E OF  
THE AREA. THE HIGH THEN RULES THE ROOST INTO FRI NT...BEFORE  
DRIFTING S AND GIVING WAY TO SW FLOW AHEAD OF A NEW COLD FRONT OVER  
THE GREAT LAKES. THE WEATHER MAP CHANGES LITTLE FOR THIS AREA SAT  
AS THAT COLD FRONT PUSHES MORE E THAN S.  
 
STILL BANKING ON HIGH PRESSURE BUILDING IN FAST ENOUGH FOR LOWS IN  
THE SINGLE DIGITS EITHER SIDE OF ZERO ATOP FRESH SNOW COVER THU NT.  
THESE LOWS ARE CLOSE TO PREVIOUS FCST AND CURRENT GUIDANCE...AND  
THIS TREND CONTINUES FOR HIGHS AND LOWS THE BALANCE OF THE PERIOD.  
 

 
   
LONG TERM /SATURDAY NIGHT THROUGH WEDNESDAY/
 
 
WNW FLOW ALOFT WITH A GENERAL TENDENCY FOR SLOWLY RISING HEIGHTS ON  
THE ANTICYCLONIC SIDE OF THE JET SPELLS BASICALLY A TEMP/DEW/SKY  
FCST. A WEAK COLD FRONT AND CORRESPONDING UPPER LEVEL S/W TROUGH  
CROSS SUN INTO SUN NT...WITH THE SMALL CHANCE FOR SNOW SHOWERS N. A  
POLAR PACIFIC HIGH FOLLOWS FOR THE EARLY PORTION OF THE NEW WORK  
WEEK. A WARM WAVE APPROACHES FROM THE S DAY 7...AS THE CONFLUENCE  
ZONE LIFTS N OF THE AREA...ALLOWING THE UPPER FLOW TO TURN SW AHEAD  
OF A SOUTHERN STREAM S/W TROUGH.  
 
LOWS SAT NT WERE CLOSE TO GUIDANCE...BUT DID A WARM RIDGE/COLD  
VALLEY SEPARATION. OTHERWISE BLENDED IN WPC FOR LITTLE CHANGE ON  
LOWS MON AND TUE NTS. BLENDED IN WPC AND ECMWF FOR HIGHS THROUGH  
THE PERIOD...A LITTLE LOWER SUN AND A LITTLE HIGHER ON TUE COMPARED  
WITH PREVIOUS. OVERALL HAVE A STEADY TEMPERATURE TREND EARLY ON  
WITH A SLOW MELT GIVEN LOWS AND DEW POINTS BELOW FREEZING AND HIGHS  
IN THE 40S. TEMPERATURES AND DEW POINTS TREND UPWARD DURING THE  
LATTER PORTION OF THE PERIOD PER AFOREMENTIONED HEIGHT RISES AND S  
TO SE FLOW ON BACK SIDE OF EXITING HIGH PRESSURE...AND AHEAD OF WARM  
WAVE APPROACHING FROM THE S.  
 

 
   
AVIATION /21Z WEDNESDAY THROUGH MONDAY/
 
 
20Z WEDNESDAY THRU 12Z THURSDAY...  
WIDESPREAD RAINS WILL CONTINUE OVER OUR AREA...WHICH IS BEHIND THE  
SURFACE FRONT LAYING JUST TO OUR SOUTH. RAIN WILL TRANSITION INTO A  
WINTRY MIX AND THEN SNOW FROM NORTHWEST TO SOUTHEAST LATE THIS AFTERNOON  
AND TONIGHT ...AND CONTINUE INTO THURSDAY MORNING. LOOK FOR  
PREVAILING IFR/LIFR CONDITIONS IN THE RAIN AND SNOW THROUGH 12Z  
THURSDAY. AFTER 12Z THURSDAY...IMPROVING IN WEST TO MVFR IN LIGHT  
SNOW...CONTINUE IFR AND MORE WIDESPREAD SNOW IN THE MOUNTAINS.  
 
SURFACE FLOW WILL GENERALLY BE OUT OF THE NW AND LIGHT ON THE ORDER  
OF 5 TO 15 KTS WITH A FEW GUSTS TO 20 KTS RIDGETOPS.  
 
FORECAST CONFIDENCE AND ALTERNATE SCENARIOS THROUGH 18Z THURSDAY...  
 
FORECAST CONFIDENCE: HIGH.  
 
ALTERNATE SCENARIOS: NONE.  
EXPERIMENTAL TABLE OF FLIGHT CATEGORY OBJECTIVELY SHOWS CONSISTENCY  
OF WFO FORECAST TO AVAILABLE MODEL INFORMATION:  
H = HIGH: TAF CONSISTENT WITH ALL MODELS OR ALL BUT ONE MODEL.  
M = MEDIUM: TAF HAS VARYING LEVEL OF CONSISTENCY WITH MODELS.  
L = LOW: TAF INCONSISTENT WITH ALL MODELS OR ALL BUT ONE MODEL.  
 
UTC 1HRLY 20 21 22 23 00 01 02 03 04 05 06 07  
EST 1HRLY 15 16 17 18 19 20 21 22 23 00 01 02  
CRW CONSISTENCY H H H H H H H H H H H H  
HTS CONSISTENCY H H H H H H H H H H H H  
BKW CONSISTENCY M M H M M M M M M H H H  
EKN CONSISTENCY M M M M M M M M M M M M  
PKB CONSISTENCY H H H H H H H H H H M M  
CKB CONSISTENCY H H H H M M H M M H H M  
 
AFTER 18Z THURSDAY...  
NO WIDESPREAD IFR CONDITIONS ARE EXPECTED AT THIS TIME.  
 

 
   
RLX WATCHES/WARNINGS/ADVISORIES
 
 
WV...FLOOD WATCH THROUGH THURSDAY MORNING FOR WVZ005>011-013>020-  
024>040-046-047.  
WINTER STORM WARNING FROM 7 PM THIS EVENING TO 7 PM EST  
THURSDAY FOR WVZ005>008-013>020-024>032-035>040-046-047.  
WINTER STORM WARNING UNTIL 1 PM EST THURSDAY FOR WVZ009>011.  
WINTER WEATHER ADVISORY FROM MIDNIGHT TONIGHT TO 7 PM EST  
THURSDAY FOR WVZ033-034.  
OH...FLOOD WATCH THROUGH THURSDAY MORNING FOR OHZ075-076-085>087.  
WINTER STORM WARNING UNTIL 1 PM EST THURSDAY FOR OHZ085>087.  
WINTER STORM WARNING UNTIL 1 PM EST THURSDAY FOR OHZ066-067-  
075-076-083-084.  
KY...FLOOD WATCH THROUGH THURSDAY MORNING FOR KYZ101>103-105.  
WINTER STORM WARNING FROM 7 PM THIS EVENING TO 7 PM EST  
THURSDAY FOR KYZ105.  
WINTER STORM WARNING UNTIL 1 PM EST THURSDAY FOR KYZ101>103.  
VA...FLOOD WATCH THROUGH THURSDAY MORNING FOR VAZ003-004.  
WINTER WEATHER ADVISORY FROM MIDNIGHT TONIGHT TO 7 PM EST  
THURSDAY FOR VAZ003-004.  
 

 
 

 
SYNOPSIS...TRM/JMV  
NEAR TERM...JMV  
SHORT TERM...TRM  
LONG TERM...TRM  
AVIATION...JMV  
 
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