044
FXUS64 KLCH 181911
AFDLCH
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAKE CHARLES LA
211 PM CDT TUE AUG 18 2026
..NEW DISCUSSION, AVIATION, MARINE, FIRE WEATHER
KEY MESSAGES
- A HEAT ADVISORY REMAINS IN EFFECT FROM CENLA TO SOUTHERN
ACADIANA UNTIL 8PM. ANOTHER HEAT ADVISORY HAS BEEN ISSUED FOR
THE SAME AREAS WEDNESDAY FROM 11 AM TO 8 PM FOR INDICES UP TO
110F.
- AN UPPER LEVEL RIDGE WILL REMAIN IN PLACE KEEPING AFTERNOON
HIGHS ABOVE NORMAL.
- NO APPRECIABLE RAINFALL ACCUMULATION IS EXPECTED THROUGH THE
NEXT SEVEN DAYS.
- VEGETATION WILL CONTINUE DRYING WITH THESE CONDITIONS. CHECK
WITH YOUR LOCAL OFFICIALS FOR BURN BANS ACROSS SETX AND CEN/SWLA.
DISCUSSION
(THIS EVENING THROUGH NEXT MONDAY)
ISSUED AT 101 PM CDT TUE AUG 18 2026
HIGH PRESSURE WILL PERSIST OVERTOP THE REGION FROM NOW THROUGH
WHAT FEELS LIKE THE END OF TIME. GUIDANCE IS INDICATING AN UPPER
TROF WILL SLOWLY DESCEND FROM THE GREAT LAKES REGION, CAUSING THE
UPPER RIDGE TO SHIFT WESTWARD SLIGHTLY. THE HIGH AND TROF WILL
WEAR ON ONE ANOTHER, CAUSING THE RIDGE TO MEANDER WEST TO EAST
OVER THE COMING DAYS. NO NEED TO GET EXCITED OVER THE PROSPECT OF
ERODING HIGH... THE NORTHWEST GULF WILL REMAIN ECLIPSED BENEATH
ITS INFLUENCE.
AS THE UPPER TROF SITS OFF TO THE EAST, ITS ENHANCED NORTHERLY
WINDS DOWN THE WEST APPALACHIANS WILL SEND A REINFORCING DRY
AIRMASS INTO THE NORTH GULF STATES. THE DRY AIR WILL ONLY ACT TO
FURTHER ENHANCE HIGH TEMPERATURES ACROSS MUCH OF THE FORECAST
AREA MAKING IT FEEL HOTTER. ON THE OTHER HAND, DRIER CONDITIONS
KEEP THE HEAT INDEX IN CHECK. SO, AS WE'VE SEEN IN RECENT
DAYS, WE'LL BE WALKING THE FINE LINE OF THAT 108F HEAT INDEX
CRITERIA.
THAT BEING SAID, ANOTHER HEAT ADVISORY HAS BEEN ISSUED FOR
PORTIONS OF CENTRAL DOWN TO LOWER ACADIANA WEDNESDAY FROM 11 AM TO
8 PM. ISSUANCE OF THE HEAT ADVISORY EACH OF THE COMING DAYS WILL
BE RATHER PAINSTAKING PROCESS AS THE AMOUNT OF MIXING EACH DAY
CONTROLS WHETHER WE HIT CRITERIA OR NOT. FORECASTER CONFIDENCE IS
NOT VERY HIGH THAT WE WILL MEET SAID CRITERIA WITHIN THE ADVISORY
TOMORROW, BUT THIS AREA IS ALSO WITHIN THE "EXTREME" LEVEL OF HEAT
RISK, SO IT WON'T TAKE NEARLY AS MUCH HEAT FOR STRESS TO SET IN ON
THE BODY. THIS CONSIDERATION DID NUDGE THE NEEDLE OVER THE LINE TO
GO ON AND ISSUE. EITHER WAY, PLEASE CONTINUE HEAT RISK SAFETY FOR
THE FORESEEABLE FUTURE.
11/CALHOUN
AVIATION
(18Z TAFS)
ISSUED AT 101 PM CDT TUE AUG 18 2026
FAIR WEATHER CU FIELDS HAVE CROPPED UP ALONG AND SOUTH OF I-10,
THE RESULT OF MOISTURE POOLING RIGHT ALONG THE SHORELINE.
MENTIONS OF THESE LOWER CLOUD CIGS WERE INCLUDED IN COASTAL TAFS
THROUGH THE EVENING. AFTER SUNDOWN, UPPER HIGH WILL CAUSE WINDS TO
DIMINISH AND CLOUDS TO CLEAR.
SIMILAR CONDITIONS WILL BE ANTICIPATED TOMORROW WITH ANOTHER ROUND
OF SCATTERED MVFR CLOUDS DEVELOPING NEAR SHORELINES.
11/CALHOUN
MARINE
ISSUED AT 101 PM CDT TUE AUG 18 2026
HIGH PRESSURE OVERTOP THE REGION WILL KEEP SKIES CLEAR OR MOSTLY
CLEAR WITH A PERSISTENT WEAK ONSHORE FETCH. WATERS WILL ALSO
REMAIN LOW OVER THE PERIOD.
FIRE WEATHER
ISSUED AT 101 PM CDT TUE AUG 18 2026
THE VERY HOT AND DRY CONDITIONS CONTINUE THROUGH THE REST OF THE
WEEK. HIGH PRESSURE OVERHEAD WILL ACT TO INCREASE TEMPS EACH DAY.
COMBINED WITH CONTINENTAL AIR MIXING INTO THE REGION, EXPECT DRY
VEGETATION TO FURTHER FEEL THESE EFFECTS. DAILY RH MINIMUMS WILL
RANGE FROM 30 TO 50 PERCENT. LOWER HUMIDITY TO THE NORTH AND
INCREASING TOWARDS THE COASTLINE.
LCH WATCHES/WARNINGS/ADVISORIES
LA...HEAT ADVISORY UNTIL 8 PM CDT THIS EVENING FOR LAZ028-029-032-033-
044-045-055-143-152>154-243-252>254.
HEAT ADVISORY FROM NOON TO 8 PM CDT WEDNESDAY FOR LAZ028-029-032-
033-044-045-055-143-153-154-253-254.
TX...NONE.
GM...NONE.
PUBLIC/FIRE/MARINE...11
AVIATION...11
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