306
FXUS64 KLCH 271720
AFDLCH
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAKE CHARLES LA
1220 PM CDT MON JUL 27 2026
..NEW DISCUSSION, AVIATION, MARINE, FIRE WEATHER
KEY MESSAGES
- DANGEROUS HEAT IS EXPECTED THIS WEEK WITH TEMPERATURES IN THE
UPPER 90S TO 100S AND HEAT INDICES OF 106-110F.
- A HEAT ADVISORY IS IN AFFECT TODAY FOR THE EASTERN PARTS OF THE
FORECAST AREA. AN AREA WIDE HEAT ADVISORY IS IN EFFECT FOR
TUESDAY.
- LATER IN THE WEEK, UPPER RIDGING BEGINS TO LOSE ITS CONTROL
OVERHEAD, ALLOWING TEMPS TO MODERATE SLIGHTLY AND RAIN CHANCES
TO RETURN TO THE FORECAST.
DISCUSSION
(THIS EVENING THROUGH NEXT SUNDAY)
ISSUED AT 1218 PM CDT MON JUL 27 2026
OVER THE NEXT SEVERAL DAYS, HEAT WILL BE OUR MAIN CONCERN AS
TEMPERATURES RISE INTO THE UPPER 90S, WHILE THE HEAT INDEX PUSHES
WELL ABOVE 100°F. HEAT ADVISORIES ARE IN EFFECT THIS AFTERNOON AND
TUESDAY. FOR THIS AFTERNOON, THE ADVISORY COVERS ACADIANA AND
AREAS ALONG I-49. FOR TUESDAY, THE ENTIRE REGION WILL BE UNDER A
HEAT ADVISORY, WITH FORECASTED HEAT INDEX VALUES UP TO 109°F. THIS
HOT WEATHER IS DUE TO A ROBUST UPPER-LEVEL RIDGE CENTERED OVER
THE FOUR CORNERS REGION THAT EXTENDS ACROSS THE SOUTHERN US. THIS
RIDGE WILL CONTINUE TO CREATE SINKING AIR, LEADING TO MOSTLY CLEAR
SKIES AND KEEPING RAIN CHANCES BASICALLY AT ZERO THROUGH THE
MIDDLE OF THE WEEK. THE MAIN LIMITING FACTOR TO THE HEAT ACROSS
THE REGION WILL BE AFTERNOON MIXING OF DRY AIR ALOFT DOWN TO THE
SURFACE, LOWERING DEW POINTS AND THE HEAT INDEX. FOR THE NEXT FEW
DAYS, THE HEAT WILL BE DANGEROUS; IF YOU ARE OUTSIDE, MAKE SURE TO
TAKE PLENTY OF BREAKS AND STAY HYDRATED.
THE FORECAST WILL BEGIN TO CHANGE ON THURSDAY AS THE RIDGE BEGINS
TO WEAKEN AND REBUILD FARTHER WEST. AS THE RIDGE WEAKENS, WE WILL
SEE A SMALL INCREASE IN POPS AS A SERIES OF WEAK TROUGHS ROTATE
AROUND IT. WITH LESS SUBSIDENCE, WE WILL ALSO SEE MORE CLOUD COVER
AND POSSIBLY A FEW DIURNALLY DRIVEN SHOWERS AND STORMS ON FRIDAY
AND THROUGH THE WEEKEND.
AVIATION
(18Z TAFS)
ISSUED AT 1218 PM CDT MON JUL 27 2026
HIGH PRESSURE WILL KEEP CONDITIONS VFR FOR THIS TAF FORECAST
PERIOD. PATCHY FOG WILL LEAD TO MVFR IMPACTS FOR KAEX NEAR SUNRISE
BEFORE RETURNING TO VFR.
MARINE
ISSUED AT 1218 PM CDT MON JUL 27 2026
HIGH PRESSURE WILL KEEP WINDS ONSHORE BETWEEN 5 AND 10 KNOTS.
WAVES WILL BE BELOW 3 FEET FOR THE REST OF THE WORK WEEK.
FIRE WEATHER
ISSUED AT 1218 PM CDT MON JUL 27 2026
A FEW FIRES HAVE FORMED ACROSS THE REGION, MAINLY IN CAMERON
PARISH, WHERE FUELS DRY OUT QUICKLY. A LACK OF WIND WILL KEEP THE
FIRE DANGER LOW. MINIMUM RH VALUES WILL BE AROUND 50%, WITH MAX RH
RECOVERY AROUND 90%.
LCH WATCHES/WARNINGS/ADVISORIES
LA...HEAT ADVISORY FROM 10 AM TO 9 PM CDT TUESDAY FOR LAZ027>033-044-
045-055-073-074-141>143-152>154-241>243-252>254.
HEAT ADVISORY UNTIL 8 PM CDT THIS EVENING FOR LAZ028-029-032-033-
044-045-055-143-152>154-243-252>254.
TX...HEAT ADVISORY FROM 10 AM TO 9 PM CDT TUESDAY FOR TXZ180-201-
259>262-515-516-615-616.
GM...NONE.
PUBLIC/FIRE/MARINE...17
AVIATION...14
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