662  
FXUS64 KJAN 210141 AAB  
AFDJAN  
 
AREA FORECAST DISCUSSION...UPDATED  
NATIONAL WEATHER SERVICE JACKSON MS  
841 PM CDT WED SEP 20 2017  
   
UPDATE
 
 
UPDATED FOR EVENING DISCUSSION.  
 

 
   
DISCUSSION
 
 
MOST OF THE CONVECTION HAS DIED DOWN NOW AND SKIES CONTINUE TO  
CLEAR. THOSE AREAS THAT SAW RAINFALL TODAY ARE ALREADY SEEING  
TEMPERATURES IN THE LOW 70S. THOSE OTHER LOCATIONS ARE STILL IN  
THE UPPER 70S. OVERALL, TEMPS WILL FALL TO THE UPPER 60S AND LOW  
70S TONIGHT. SOME PATCHY FOG WILL AGAIN BE POSSIBLE TOMORROW  
MORNING. CLEARED OUT MOST OF THE POPS IN THE FORECAST WITH THIS  
UPDATE. /10/  
 
PRIOR DISCUSSION BELOW:  
 
TONIGHT THROUGH THURSDAY...  
 
LATEST RAP SATELLITE IMAGERY SHOWED A WEAK SHORTWAVE MOVING INTO THE  
REGION. THIS COMBINED WITH SOME COOLING ALOFT AND LOW LEVEL MOISTURE  
HAD TRIGGERED SCATTERED SHOWERS AND SOME THUNDERSTORMS ACROSS THE  
REGION. WITH 6-7C LAPSE RATES WE MAY SEE A FEW STRONG STORMS WITH  
SOME GUSTY WINDS FOR THE REMAINDER OF THE AFTERNOON. EXPECT THE WEAK  
SHORTWAVE TO EXIT THE REGION BY LATE TONIGHT. FOR EARLY THIS EVENING  
THE LAST OF THE SHOWERS WILL END ACROSS THE NORTHWEST AND SOUTH. FOR  
LATER TONIGHT EXPECTING ANOTHER ROUND OF PATCHY FOG PRIOR TO DAWN  
WHICH WILL LIFT BY 14Z. ANOTHER WEAK SHORTWAVE FROM THE WEST WILL  
PUSH THROUGH ON THURSDAY. RETURN FLOW AHEAD OF THIS FEATURE WILL  
TRIGGER ISOLATED TO SCATTERED SHOWERS AND THUNDERSTORMS MAINLY  
DURING THE AFTERNOON. ONCE AGAIN MIDLEVEL LAPSE RATES WILL BE FROM 6-  
7C WITH WEAK FLOW. THIS COULD BRING A FEW STRONG STORMS WITH SOME  
GUSTY WINDS DURING THE AFTERNOON.  
 
AS FAR AS TEMPERATURES ARE CONCERN READINGS WILL CONTINUE TO BE  
ABOVE NORMAL. LOWS WILL BE IN THE UPPER 60S TO LOWER 70S. HIGHS WILL  
BE IN THE UPPER 80S TO LOWER 90S. HEAT INDICES WILL RANGE FROM THE  
MIDDLE 90S TO AROUND 100./17/  
 
THURSDAY NIGHT THROUGH WEDNESDAY...  
 
THE PERIOD WILL START OUT WITH A HIGHLY AMPLIFIED PATTERN OVER THE  
CONUS AS A DEEP LONGWAVE TROUGH DIGS ACROSS THE WESTERN PORTION OF  
THE US. THIS WILL IN TURN AMPLIFY DOWNSTREAM RIDGING OVER THE MID-  
MISSISSIPPI RIVER VALLEY AND MIDWEST. THIS RIDGING WILL KEEP THE  
WARMEST TEMPERATURES IN PLACE THROUGH THE WEEKEND WITH HIGHS IN THE  
LOW 90S BEFORE AN UPPER LOW RETROGRADES BENEATH THE RIDGE AND INTO  
THE ARKLAMISS BY THE START OF NEXT WORK WEEK. THESE LOWER HEIGHTS  
WILL HELP KEEP TEMPERATURES A FEW DEGREES COOLER WITH HIGHS TOPPING  
OUT IN THE UPPER 80S THROUGH THE MIDDLE OF THE WEEK. A COLD FRONT IS  
PROGGED TO MOVE THROUGH THE AREA NEXT THUR/FRI WITH A STOUT  
SHORTWAVE DIVING THROUGH THE NORTHERN PLAINS HELPING TO REINFORCE A  
MORE FALL LIKE AIRMASS ACROSS THE AREA. IN TERMS OF PRECIPITATION,  
ISOLATED TO SCATTERED DIURNALLY DRIVEN AFTERNOON SHOWERS AND STORMS  
CAN BE EXPECTED THROUGH THE WEEKEND WITH THE GREATEST COVERAGE ALONG  
AND SOUTH OF I-20. WHILE SOME ISOLATED ACTIVITY COULD LINGER INTO  
EARLY NEXT WEEK, DRIER AIR WEDGING IN FROM THE EAST WILL HELP TO CUT  
BACK ON COVERAGE WITH ANY ISOLATED SHOWERS AND STORMS CONFINED  
MAINLY TO THE DELTA. /TW/  
 

 
   
AVIATION
 
 
00Z TAF DISCUSSION:  
ISOLD TSRA WERE NOTED JUST NORTH OF GTR AND BETWEEN I-20 AND HWY  
84 AT 2330Z. THIS ACTIVITY WL DISSIPATE BY 21/02Z AND VFR CONDS WL  
PREVAIL AREAWIDE UNTIL 10Z. AFTER 10Z MVFR VSBYS WL BE PSBL  
AREAWIDE UNTIL 14Z. AFTER 14Z VFR CONDS WL PREVAIL UNTIL ISOLD TO  
SCT TSRAS DEVELOP THU AFTN AND CONT INTO EARLY EVNG. /22/  
 

 
   
PRELIMINARY POINT TEMPS/POPS
 
 
JACKSON 70 93 71 91 / 9 30 9 27  
MERIDIAN 70 93 69 90 / 11 30 16 30  
VICKSBURG 71 92 71 91 / 8 21 5 18  
HATTIESBURG 69 91 69 90 / 15 29 17 34  
NATCHEZ 70 91 70 90 / 15 25 11 29  
GREENVILLE 71 93 70 92 / 8 17 5 17  
GREENWOOD 71 93 71 91 / 8 19 5 17  
 

 
   
JAN WATCHES/WARNINGS/ADVISORIES
 
 
MS...NONE.  
LA...NONE.  
AR...NONE.  
 

 
 

 
 
CLICK HERE TO GO TO PREVIOUS BULLETINS.

The Nexlab MS Page
The Nexlab AR Page
The Nexlab LA Page Main Text Page