Alert archive / Louisiana / Special Weather Statements in 2011
Special Weather Statement, NWS Lake Charles, LA
NWS Lake Charles, LA issued this special weather statement at Jul 31, 2011, 5:32 PM CDT for Saint Martin Parish, St. Mary Parish, Louisiana. It was in force for 73 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jul 31, 2011, 5:32 PM CDT (22:32 UTC)
- Expired
- Jul 31, 2011, 6:45 PM CDT
- In force
- 73 min
- Issued by
- NWS Lake Charles, LA
Counties Saint Martin Parish, LA, St. Mary Parish, LA
The nearest sounding before it
Slidell Radar S, LA (KSIL), launched 12:00Z, 10.5 hours before the alert went out and 175 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 2762 J/kg
- Mixed-layer CIN
- -19 J/kg
- Mixed-layer LCL
- 736 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- -2 m²/s²
- 0-3 km storm-relative helicity
- 6 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>What forecasters said that day
The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Lake Charles, LA wrote its last area forecast discussion before this special weather statement went out at Jul 31, 3:49 PM CDT, 1 hour 43 minutes earlier.
Area forecast discussion, Jul 31, 3:49 PM CDT, 1 hour 43 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE LAKE CHARLES LA 349 PM CDT SUN JUL 31 2011 .DISCUSSION... SFC ANALYSIS SHOWS HIGH PRESSURE CENTERED OVER THE NRN GULF COAST THIS AFTERNOON WHILE WATER VAPOR IMAGERY SHOWS RIDGING IN PLACE FROM THE SRN PLAINS EWD THROUGH THE MID-MISSISSIPPI VALLEY. A WEAK DISTURBANCE ROUNDING THE RIDGE IS HELPING SET OFF SOME CONVECTION OVER SERN LA/SWRN MS WITH A FEW STRAGGLER SHOWERS AND STORMS SEEN ON LOCAL 88DS OVER THE FORECAST AREA. REGIONAL OBSERVATIONS SHOW A VERY WARM DAY IN PROGRESS WITH HEAT INDICES GENERALLY IN THE TRIPLE DIGITS...BUT SO FAR NOT QUITE TO HEAT ADVISORY CRITERIA. THE LIMITED CONVECTION OVER OR APPROACHING THE FORECAST AREA WILL LINGER THROUGH SUNSET...PARTICULARLY OF INTEREST ARE SOME STRONG STORMS SEEN OVER SWRN MS MOVING SWWD TOWARD OUR NERN ZONES... BEFORE DISSIPATING WITH LOSS OF HEATING AND HAVE CARRIED A SMALL POP FOR THE ERN ZONES FOR THE EVENING HOURS TO ACCOUNT. THEN FOR TOMORROW THE MODELS AGREE ON CARRYING THE DISTURBANCE ACROSS THE NRN GULF WHICH WILL AGAIN ALLOW FOR SCATTERED SHOWERS AND STORMS TO BREAK OUT BY MID-MORNING AS HEATING COMMENCES. CANNOT RULE OUT A STORM WELL INLAND BUT THE MAIN STORY WILL BE THE HEAT ACROSS THE NRN 1/2 OF THE AREA AND ESPECIALLY W-CNTL LA AND INTERIOR SERN TX. AT THE PRESENT TIME HEAT INDEX VALUES...BASED ON FORECAST TEMPS AND DEWPOINTS...WILL HIT AS HIGH AS 110F OVER PORTIONS OF THIS REGION ON MONDAY AFTERNOON. COULD PROBABLY PULL THE TRIGGER ON A HEAT ADVISORY ATTM FOR THE NRN EXTREMES OF THE FORECAST AREA BUT WILL PROCEED WITH CAUTION AND LET THE MIDNIGHT SHIFT MAKE THE FINAL CALL ON THIS MATTER. THE RIDGE AXIS SEEN TO OUR NORTH IS PROGGED TO DRIFT SLOWLY SWD OVER THE COMING DAYS...ESSENTIALLY SHUTTING OFF PRECIPITATION FOR MUCH OF THE PERIOD. DID CARRY MINIMAL POPS FOR TUESDAY AS THE AXIS WILL STILL BE SLIGHTLY TO OUR NORTH WHICH WILL KEEP THE CAP FROM GROWING TOO STRONG BY THAT POINT. BUT FOR THE WEDNESDAY THROUGH FRIDAY TIME FRAME THE RESULTANT CAP LOOKS STRONG ENOUGH TO KEEP POPS OUT OF THE FORECAST. THE HEAT WILL AGAIN BE THE MAIN CONCERN WITH MUCH OF THE NRN 1/2 OF THE AREA SEEING HIGHS IN THE LOW TRIPLE DIGITS. HOPEFULLY ENOUGH DRY AIR WILL ENTRAINED FROM ABOVE TO KEEP DEWPOINTS LOW ENOUGH TO NOT REQUIRE ADDITIONAL HEAT ADVISORIES...WILL SEE AS WE GET CLOSER. FINALLY THE RIDGE BEGINS TO BREAK DOWN AND RETROGRADE AS TROFFING DEVELOPS OVER THE ERN CONUS...ALLOWING BETTER MOISTURE AND SMALL RAIN CHANCES TO RETURN. && .MARINE... LIGHT AND VARIABLE FLOW EXPECTED THROUGH TOMORROW WITH THE HIGH ON OUR DOORSTEP...FOLLOWED BY MAINLY LIGHT SWRLY OR SRLY FLOW THEREAFTER. NO FLAGS ANTICIPATED THIS FORECAST PERIOD. && .PRELIMINARY POINT TEMPS/POPS... KLCH 78 95 77 96 80 / 10 40 20 20 10 KBPT 78 96 78 96 79 / 10 40 20 20 10 KAEX 77 100 77 101 78 / 10 30 20 20 10 KLFT 78 95 78 97 79 / 20 40 20 20 10 && .LCH WATCHES/WARNINGS/ADVISORIES... LA...NONE. TX...NONE. GM...NONE. && 25
Hazardous weather outlook, Jul 31, 4:35 AM CDT, 12 hours 57 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE LAKE CHARLES LA 435 AM CDT SUN JUL 31 2011 GMZ430-432-435-LAZ027>033-041>045-051>055-TXZ180>182-201-215-216- 010945- SABINE LAKE-CALCASIEU LAKE-VERMILION BAY-VERNON-RAPIDES-AVOYELLES- BEAUREGARD-ALLEN-EVANGELINE-ST. LANDRY-CALCASIEU-JEFFERSON DAVIS- ACADIA-LAFAYETTE-UPPER ST. MARTIN-CAMERON-VERMILION-IBERIA- ST. MARY-LOWER ST. MARTIN-TYLER-JASPER-NEWTON-HARDIN-JEFFERSON- ORANGE- 435 AM CDT SUN JUL 31 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF THE NORTHWEST GULF OF MEXICO...CENTRAL LOUISIANA...SOUTH CENTRAL LOUISIANA... SOUTHWEST LOUISIANA...WEST CENTRAL LOUISIANA AND SOUTHEAST TEXAS. .DAY ONE...TODAY AND TONIGHT ISOLATED SHOWERS AND THUNDERSTORMS OVER THE SOUTH CENTRAL PORTION OF LOUISIANA THIS AFTERNOON, OTHERWISE HOT AND DRY WITH TEMPERATURES CLIMBING INTO THE MID TO UPPER 90S AND THE HEAT INDEX FROM 97 TO 103 THIS AFTERNOON. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY SCATTERED SHOWERS AND THUNDERSTORMS IN MONDAY AND TUESDAY. TEMPERATURES IN THE MID TO UPPER 90S THROUGH THE WEEK WITH A HEAT INDEX RANGING FROM 96 TO 105. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED. GMZ450-452-455-470-472-475-010945- COASTAL WATERS FROM CAMERON, LA TO HIGH ISLAND, TX OUT 20 NM- COASTAL WATERS FROM INTRACOASTAL CITY TO CAMERON, LA OUT 20 NM- COASTAL WATERS FROM LOWER ATCHAFALAYA RIVER TO INTRACOASTAL CITY, LA OUT 20 NM- WATERS FROM CAMERON, LA TO HIGH ISLAND, TX EXTENDING FROM 20 NM TO 60 NM- WATERS FROM INTRACOASTAL CITY, LA TO CAMERON, LA EXTENDING FROM 20 NM TO 60 NM- WATERS FROM LOWER ATCHAFALAYA RIVER TO INTRACOASTAL CITY, LA EXTENDING FROM 20 NM TO 60 NM- 435 AM CDT SUN JUL 31 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF THE NORTHWEST GULF OF MEXICO. .DAY ONE...TODAY AND TONIGHT A FEW SHOWERS IN THE COASTAL WATERS THIS AFTERNOON. OTHERWISE NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY SCATTERED SHOWERS AND THUNDERSTORMS ON MONDAY AND TUESDAY... OTHERWISE DRY AND HOT THROUGH THE PERIOD WITH SOUTHERLY WINDS AND SEAS 3 FEET OR LESS. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED.
In the hours before
Special weather statement, Jul 31, 5:32 PM CDT, 0 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE LAKE CHARLES LA
532 PM CDT SUN JUL 31 2011
LAZ045-053>055-312345-
UPPER ST. MARTIN LA-LOWER ST. MARTIN LA-ST. MARY LA-IBERIA LA-
532 PM CDT SUN JUL 31 2011
...SIGNIFICANT WEATHER ADVISORY FOR ST. MARY...IBERIA AND ST. MARTIN
PARISHES UNTIL 645 PM CDT...
AT 529 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
LINE OF STRONG THUNDERSTORMS...ALONG A LINE EXTENDING FROM 10 MILES
WEST OF PLAQUEMINE TO 7 MILES SOUTHWEST OF PIGEON TO BAYOU VISTA...
MOVING SOUTHWEST AT 10 MPH.
* THE LINE OF STRONG THUNDERSTORMS WILL BE NEAR...
BAYOU VISTA BY 535 PM...
PATTERSON BY 545 PM...
PATTERSON MEMORIAL AIRPORT BY 555 PM...
WHISKEY BAY AND ATCHAFALAYA NATIONAL WILDLIFE REFUGE BY 615 PM...
FRANKLIN...CHARENTON...BALDWIN AND ELLERSLIE BY 645 PM...
THE PRIMARY THREATS FROM THESE STORMS ARE FREQUENT LIGHTNING AND WIND
GUSTS 40 TO 50 MPH...WHICH COULD DOWN TREE LIMBS AND BLOW AROUND
UNSECURED SMALL OBJECTS. BOATERS ACROSS THE ATCHAFALAYA BASIN AND
AREA LAKES ARE URGED TO SEEK SHELTER UNTIL THESE STORMS HAVE PASSED.
THESE STORMS COULD PRODUCE RAINFALL AMOUNTS OF ONE TO TWO INCHES IN
A SHORT PERIOD OF TIME. FOR AREAS OUTSIDE THE ATCHAFALAYA
BASIN...THIS COULD RESULT IN PONDING OF WATER AROUND LOW LYING
ROADWAYS. REMEMBER...DO NOT DRIVE YOUR VEHICLE INTO WATER COVERED
ROADWAYS. THE DEPTH MAY BE TOO GREAT TO ALLOW A SAFE CROSSING.
LAT...LON 2954 9127 2943 9122 2948 9134 2935 9138
2942 9151 2940 9139 2950 9136 2941 9147
2953 9144 2951 9155 2963 9157 2962 9161
3039 9173 3040 9162 3011 9146 3004 9121
2986 9119 2981 9109 2960 9107
LANDRENEAUThe office that day
Everything else NWS Lake Charles, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 31, 6:19 PM CDT | Severe Thunderstorm Warning | LCH | Saint Martin, St. Mary | 56 min |
| Jul 31, 6:36 PM CDT | Special Marine Warning | LCH | 114 min | |
| Jul 31, 6:59 PM CDT | Special Weather Statement | LCH | St. Mary | 76 min |
Nearby
Special Weather Statements in Louisiana, 2011Every special weather statement in 2011
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.