079  
FXUS64 KLIX 190446  
AFDLIX  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE NEW ORLEANS LA  
1146 PM CDT THU SEP 18 2025  
   
..NEW SHORT TERM, LONG TERM, AVIATION, MARINE
 
 
   
KEY MESSAGES
 
 
UPDATED AT 1115 PM CDT THU SEP 18 2025  
 
- CALM/QUIET WEATHER EXPECTED TODAY THRU THE UPCOMING WEEKEND  
WITH HIGHS IN THE LOW TO MID 90S. NO EXCESSIVE HEAT CONCERNS IN  
THE FORECAST.  
 
- CAN'T RULE OUT AN ISOLATED SHOWER OR STORM FOR  
NORTHERN/NORTHEASTERN AREAS THIS AFTERNOON, BUT COVERAGE WILL  
BE LIMITED.  
 
- RAIN/STORM CHANCES HAVE LOWERED SOMEWHAT GOING INTO THE EARLY  
TO MIDDLE PARTS OF NEXT WEEK - MORE ROUTINE WITH SCATTERED  
DAILY MAINLY AFTERNOON/EVENING SHOWER/STORM CHANCES.  
 

 
   
SHORT TERM
 
 
(TONIGHT THROUGH SUNDAY NIGHT)  
ISSUED AT 1115 PM CDT THU SEP 18 2025  
 
QUIET AND CALM EARLY THIS MORNING WITH ONLY SOME SCATTERED  
MID/UPPER-LEVEL CLOUDS AROUND. MAIN FOCUS FOR TODAY WAS ON WHAT  
WAS PRESENTED BY THE RECENT SUITE OF 00Z CAM GUIDANCE, ATTEMPTING  
AT INTRODUCING A FEW ISOLATED SHOWERS OR STORMS MAINLY FOR  
NORTHERN AREAS, NORTH OF I-10/12 AND EAST OF I-55. TAKING A CLOSER  
LOOK A PROXIMITY SOUNDINGS FROM THE HRRR (00Z FOR KMCB)  
ILLUSTRATES THAT WE WILL MIX OUT STRONGLY, AS WE HAVE FOR WEEKS  
NOW INCREASING LCL HEIGHTS ABOVE A DRY ADIABATIC, DEEP MIXED  
LAYER. SUBSIDENCE AT H6 WILL KEEP MID-LEVEL TEMPS RELATIVELY  
"WARMER" INTO THE -7 TO -8C RANGE, HOWEVER JUST ENOUGH AVAILABLE  
ENERGY BETWEEN THE LCL AND INVERSION BASE WILL SUPPORT SCATTERED  
CU TO DEVELOP AS WE WARM UP. ADDITIONALLY, THE H5 PATTERN SUGGESTS  
A GENERALIZED WEAKNESS ALOFT WHERE JUST ENOUGH LIFT AND  
AFOREMENTIONED SHALLOW ENERGY COULD SPARK A FEW SHOWERS/STORMS  
HERE AND THERE. GREATER CONFIDENCE WILL COME FROM ANY EXTRA BOOST  
LIKELY A NORTHWARD DRIFTING LAKE/SEABREEZE BOUNDARY) BEING AN  
EXTRA AID/FOCI IN ASCENT TO GET A FEW GOING. THUS, INCREASED  
INHERITED 01Z NBM PPI01 GRIDS FROM 0-5% TO 15-17% TO GET A  
MENTION IN THE FORECAST. ADDITIONALLY, AS FOR DEWPOINTS, DID LOWER  
GUIDANCE UTILIZING THE NBM 25TH TO 10TH PERCENTILE THIS AFTERNOON  
TO ACCOUNT FOR THE WELL-MIXED PBL WE CAN EXPECT LATER TODAY.  
OBSERVATIONS FROM YESTERDAY ILLUSTRATE A FEW AREAS HIT THE UPPER  
50'S, WELL ON THE LOW END OF GUIDANCE AND WILL KEEP THAT LOWER-END  
BIAS GOING.  
 
OTHERWISE, THE WEEKEND IS LOOKING NICE AND DRIER! HIGHS REMAIN IN  
THE LOW TO MID 90'S. NOTHING RECORD-BREAKING AS RECORDS ARE WELL  
INTO THE UPPER 90'S TO NEAR/AT 100 FOR SOME LOCATIONS, BUT IS  
ABOVE AVERAGE BY SEVERAL DEGREES. KLG  
 

 
   
LONG TERM
 
 
(MONDAY THROUGH THURSDAY NIGHT)  
ISSUED AT 1115 PM CDT THU SEP 18 2025  
 
NOW GOING INTO NEXT WEEK, THERE ARE A FEW INTERESTING CHANGES IN  
TRENDS WITH LONG-RANGE GUIDANCE. NAMELY, JUST BY QUICKLY GLANCING  
AT DETERMINISTIC GUIDANCE SHOWS THE CUT-OFF UPPER-LOW OVER THE  
MID-WEST BEING MUCH LESS AMPLIFIED/STRONGER AND OVERALL WEAKER,  
ALLOWING A STRONGER RIDGING PATTERN TO BUILD OVER THE SOUTHERN  
US. THIS UPPER-LOW WAS PREVIOUSLY THE DRIVING FORCE TO SEND A  
WEAKNESS/WEAK TROUGH INTO THE NORTHERN GULF COAST STATES  
INTRODUCING WIDESPREAD SHOWER/STORM CHANCES. THIS TOOK SOME  
INVESTIGATING, AND DOVE DEEPER INTO CLUSTER ANALYSIS TO BETTER  
GET AN IDEA AT WHAT IS GOING ON WHICH REVEALED THE NORTHERN  
US/SOUTHERN CANADIAN RIDGE BEING STRONGER, AND THE CUT-OFF LOW  
ORIGINATING AS A SHORTWAVE TROUGH OVER THE PACNW BEING STUCK  
UNDER THE RIDGE IN A SUBTLE OMEGA PATTERN. THIS MAKES SENSE, AND  
LOSES ANY MOMENTUM DURING IT'S SLOW EASTWARD DRIFT BECOMING  
WEAKER/STRETCHING OUT WITH TIME, AND IN-TURN REDUCES SOUTHERN US  
TROUGHING TO ALLOW A 588DM RIDGE TO BUILD IN MORE. CAUSE/EFFECT  
IS THE NBM LOWERING POPS FROM THE 50/60'S TUESDAY/WEDNESDAY TO  
MORE 20/30'S. HAVING A VERY HARD TIME THINKING - EVEN WITH THIS  
TREND - THAT POPS WILL GET MUCH LOWER THAN THIS, AS REGARDLESS AT  
A MINIMUM, WE SHOULD SETTLE INTO A MORE ROUTINE SUMMERTIME  
AFTERNOON/EVENING SCATTERED SHOWER/STORM REGIME, BUT GIVEN THIS  
LONG-RANGE SHIFT/TREND, WILL ADVERTISE SHOWERS/STORMS WILL BE  
AROUND AND WILL MONITOR HOW THIS CONTINUES TO TREND OVER THE NEXT  
FEW DAYS. OVERALL, SOMEONE WILL SEE RAIN/STORMS NEXT WEEK WHICH  
WITH THE LATEST DROUGHT MONITOR ILLUSTRATING WIDESPREAD D0 AND  
POCKETS OF D1, COULD BE SEEN AS USEFUL ESPECIALLY AS WE CLOSE IN  
ON THE SEASONABLY DRIEST PERIOD OF THE YEAR ACCORDING TO  
CLIMATOLOGY. TEMPERATURES REMAIN HOT, BUT NOT SEEING EXCESSIVE  
HEAT CONCERNS THRU THE NEXT 5-7 DAYS. KLG  
 

 
   
AVIATION
 
 
(06Z TAFS)  
ISSUED AT 1115 PM CDT THU SEP 18 2025  
 
EXPECT VFR CONDITIONS FOR ALL AREA TERMINALS THROUGH THE FORECAST  
PERIOD. SKC AND LIGHT/CALM WINDS EARLY THIS MORNING, THEN WE'LL  
SEE WINDS INCREASE TO AROUND 6-8KTS FROM 16-18Z THRU SUNSET. WILL  
SEE A LAKE/SEABREEZE FOR COASTAL TERMINAL SITES, CAUSING A BRIEF  
WIND SHIFT BUT OTHERWISE WILL SOME SCT LOW- LEVEL CU IN THE  
AFTERNOON. CAN'T RULE OUT A BRIEF ISO SHRA/TSRA FOR KMCB TO NORTH  
OF KGPT/KASD THIS AFTERNOON BUT IMPACTS WILL BE LIMITED. KLG  
 

 
   
MARINE
 
 
ISSUED AT 1115 PM CDT THU SEP 18 2025  
 
QUIET/CALM CONDITIONS FOR MARINE WATERS CAN BE EXPECTED THRU THIS  
UPCOMING WEEKEND THANKS TO A WEAK RIDGE OF HIGH PRESSURE TO OUR  
NORTH, PROMOTING MAINLY LIGHT EASTERLY WINDS AND CALM WAVES/SEAS.  
WITH LIGHT WINDS AND CALM WAVES/SEAS. CAN'T RULE OUT A FEW ISOLATED  
SHOWERS EACH DAY, BUT CHANCES GO UP SLIGHTLY MORE AS WE GO INTO  
MONDAY THRU MID-WEEK BUT WILL PRIMARILY BE SCATTERED CHANCES FOR  
NOW. KLG  
 

 
   
PRELIMINARY POINT TEMPS/POPS
 
 
MCB 66 92 68 92 / 0 20 10 0  
BTR 68 93 69 94 / 0 10 0 0  
ASD 66 92 68 92 / 0 20 10 0  
MSY 73 93 74 94 / 0 0 0 0  
GPT 70 91 71 92 / 0 10 10 0  
PQL 66 93 68 94 / 0 20 10 0  
 

 
   
LIX WATCHES/WARNINGS/ADVISORIES
 
 
LA...NONE.  
GM...NONE.  
MS...NONE.  
GM...NONE.  

 
 

 
 
SHORT TERM...KLG  
LONG TERM....KLG  
AVIATION...KLG  
MARINE...KLG  
 
CLICK HERE TO GO TO PREVIOUS BULLETINS.

The Nexlab LA Page
The Nexlab MS Page Main Text Page