719  
FXUS64 KTSA 230531  
AFDTSA  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE TULSA OK  
1131 PM CST WED JAN 22 2020  
   
AVIATION
 
 
CONCERNING TAF SITES KTUL/KRVS/KBVO/KMLC/KXNA/KFYV/KFSM/KROG.  
WIDESPREAD IFR CONDITIONS CURRENTLY WITH FAR NW AR MAINTAINING A  
MORE VARIABLE FLIGHT CONDITION. BAND OF LIGHT PRECIP ACROSS  
EASTERN OK WILL CONTINUE EASTWARD AND PUSH EAST OF THE AR  
TERMINALS BEFORE SUNRISE. IFR TO POSSIBLY BRIEF LIFR CONDITIONS  
OVERNIGHT INTO EARLY THURS MORNING WITH A GRADUAL IMPROVEMENT IN  
FLIGHT LEVELS THROUGH THE DAY. NEXT AREA OF PRECIP SPREADS BACK  
INTO NE OK / FAR NW AR BY LATE THURS AFTERNOON OR EARLY EVENING.  
 

 
   
PREV DISCUSSION
 
/ISSUED 838 PM CST WED JAN 22 2020/  
   
.UPDATE
 
 
DISCUSSION...  
CONTINUING TO HAVE ISSUES WITH FROZEN PRECIPITATION,  
MAINLY FREEZING RAIN AND SLEET, ACROSS SOME OF THE  
COLDER VALLEYS OF NORTHWEST ARKANSAS THIS EVENING.  
WITH THE CHANCES OF PRECIPITATION CONTINUING THROUGH  
THE NIGHT ACROSS EASTERN OKLAHOMA AND WESTERN ARKANSAS  
WITH ISENTROPIC LIFT IN ADVANCE OF A COLD FRONT THAT IS  
SLATED TO MOVE THROUGH THE REGION ON THURSDAY, WILL KEEP  
THE WINTER WEATHER ADVISORY GOING UNTIL 12Z FOR OUR NORTHWEST  
ARKANSAS COUNTIES EXCEPT BENTON AND SEBASTIAN. WILL CANCEL  
THE REMAINING OKLAHOMA COUNTIES WITH THIS UPDATE AS  
PRECIPITATION IS FALLING AS RAIN.  
 
AREAS OF FOG AND DRIZZLE WILL ALSO BE AN ISSUE LATER  
TONIGHT BEHIND THE MAIN AREA OF PRECIPITATION. SOME  
AREAS MY SEE DENSE FOG BUT DON'T HAVE ENOUGH CONFIDENCE  
AT THIS TIME TO GO WITH A DENSE FOG ADVISORY.  
 
PREV DISCUSSION... /ISSUED 543 PM CST WED JAN 22 2020/  
 
AVIATION...  
CONCERNING TAF SITES KTUL/KRVS/KBVO/KMLC/KXNA/KFYV/KFSM/KROG.  
ONGOING IFR TO PERIODIC LIFR CONDITIONS PREVAIL FOR MOST TERMINALS  
WITH THE EXCEPTION BEING ACROSS FAR NW AR WHERE FLIGHT CONDITIONS  
REMAIN HIGHLY VARIABLE. LIGHT PRECIP SHOULD CONTINUE INTO THE  
OVERNIGHT HOURS WITH A GRADUAL FOCUS EASTWARD. AREAS OF DENSE FOG  
MAY DEVELOP LATER TONIGHT THROUGH E OK ON PERIPHERY OF LOWER CLOUD  
DECK AND FCST WILL BEGIN TREND THIS DIRECTION. THURS AFTERNOON  
SHOULD SEE SOME IMPROVEMENT IN FLIGHT CONDITIONS.  
 
PREV DISCUSSION... /ISSUED 249 PM CST WED JAN 22 2020/  
 
DISCUSSION...  
 
THE MAIN FORECAST CONCERN WILL BE TRAVEL IMPACTS IN THE SHORT TERM  
FROM LIGHT WINTRY WEATHER THIS AFTERNOON AND EVENING AND AGAIN  
THURSDAY NIGHT INTO FRIDAY.  
 
LIFT IN ADVANCE OF A SHORTWAVE TROUGH OVER WESTERN/CENTRAL OK IS  
PRODUCING LIGHT PRECIPITATION OVER THE REGION THIS AFTERNOON AND  
THIS SHOULD CONTINUE INTO THE EVENING. TEMPS HAVE RISEN ABOVE  
FREEZING IN MOST LOCATIONS, THUS A LIGHT RAIN OR DRIZZLE IS MOST  
LIKELY. HOWEVER, IN THE LOWER ARK RIVER VALLEY AND IN HIGHER  
TERRAIN AREAS OF W AR AND SOUTHERN LE FLORE COUNTY OK, TEMPS  
CONTINUE TO HOVER NEAR FREEZING. THUS A MIX OF LIGHT FREEZING  
RAIN/DRIZZLE OR SLEET IS POSSIBLE THRU THE EVENING IN THESE  
LOCATIONS. TRAVEL DOWN THRU THE BOSTON MOUNTAINS ON ROADWAYS WITH  
LONG BRIDGES SUCH AS I-49 WILL CONTINUE TO HAVE ISSUES. THUS, A  
WINTER WEATHER ADVISORY WILL BE MAINTAINED OVER MUCH OF NW AR AND  
PORTIONS OF EAST CENTRAL OKLAHOMA THRU MIDNIGHT. TEMPS ARE  
EXPECTED TO SLOWLY RISE OVERNIGHT, EVENTUALLY ENDING THE TRAVEL  
ISSUES.  
 
THE LATEST HI-RES DATA SUGGESTS A BAND OF SHOWERS WILL DEVELOP  
ALONG AN ADVANCING WIND SHIFT/FRONT LATE TONIGHT INTO EARLY  
THURSDAY. AN ISOLATED STORM IS POSSIBLE DOWN NEAR THE RED RIVER  
WITH SOME AIRMASS IMPROVEMENT EXPECTED AHEAD OF THE BOUNDARY. ONCE  
THIS BAND OF SHOWERS AND ISOLATED STORMS CLEARS THE AREA, THERE  
WILL BE A LULL IN THE ACTION UNTIL WE BEGIN TO FEEL THE INFLUENCE  
OF A DEVELOPING UPPER LEVEL LOW PRESSURE SYSTEM TO OUR NORTH.  
 
WRAP-AROUND MOISTURE ON THE SOUTH AND WEST SIDE OF THE UPPER LEVEL  
LOW OVER MO IS EXPECTED TO BEGIN AFFECTING PORTIONS OF NORTHEAST  
OKLAHOMA AND NORTHWEST ARKANSAS THURSDAY AFTERNOON AND NIGHT.  
CURRENT THOUGHT IS INITIAL PRECIP WILL BE MAINLY SHOWERS BUT A  
CHANGE OVER TO SNOW IS EXPECTED THURSDAY NIGHT. ACCUMULATIONS ARE  
EXPECTED TO BE GENERALLY LESS THAN AN INCH, WITH THE HIGHEST  
AMOUNTS NEAR THE KS AND MO BORDERS.  
 
AFTER THIS SYSTEM DEPARTS, QUIET AND WARMER WEATHER WILL PREVAIL  
THRU THE WEEKEND INTO EARLY NEXT WEEK. ANOTHER STORM SYSTEM IS  
EXPECTED TO AFFECT THE REGION BY TUESDAY. IT IS NOT LIKELY THAT  
THIS SYSTEM WILL HAVE TIME TO DRAW ENOUGH MOISTURE/INSTABILITY  
NORTHWARD IN TIME TO PRODUCE A SEVERE THREAT, BUT THERE IS  
POTENTIAL OF SOME WINTER WEATHER ON THE BACK SIDE OF THE SYSTEM AS  
IT DEPARTS. DETAILS WILL CONTINUE TO BE REFINED IN THE COMING  
DAYS.  
 
LACY  
 

 
   
PRELIMINARY POINT TEMPS/POPS
 
 
TUL 39 36 47 32 / MMM 70 20 20  
FSM 35 34 43 33 / MMM 80 40 20  
MLC 39 36 48 32 / MMM 70 10 0  
BVO 38 35 46 30 / MMM 50 20 20  
FYV 36 36 40 30 / MMM 80 40 40  
BYV 35 32 40 31 / MMM 80 50 50  
MKO 37 34 46 31 / MMM 70 10 10  
MIO 37 34 42 30 / MMM 70 40 50  
F10 39 36 47 32 / MMM 70 0 10  
HHW 38 36 48 34 / MMM 100 20 0  
 

 
   
TSA WATCHES/WARNINGS/ADVISORIES
 
 
OK...NONE.  
AR...WINTER WEATHER ADVISORY UNTIL 6 AM CST THURSDAY FOR ARZ002-010-  
011-019-020.  
 

 
 

 
 
AVIATION.....07  
 
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