Alert archive / Louisiana / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 13, NWS Lake Charles, LA

March 14, 2007St. Mary Parish, Louisiana

NWS Lake Charles, LA issued this severe thunderstorm warning at Mar 14, 2007, 10:54 PM CDT for St. Mary Parish, Louisiana. It was in force for 66 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: Mar 14, 2007, 10:54 PM CDT (03:54 UTC)
Expired: Mar 15, 2007, 12:00 AM CDT
In force: 66 min
Issued by: NWS Lake Charles, LA
Area: Counties, with a storm outline in the text

County St. Mary Parish, LA

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 3.9 hours before the alert went out and 177 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 204 J/kg
Mixed-layer CIN: -25 J/kg
Mixed-layer LCL: 827 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 73 m²/s²
0-3 km storm-relative helicity: 70 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WUUS54 KLCH 150355
SVRLCH
LAC101-150500-
/O.NEW.KLCH.SV.W.0013.070315T0354Z-070315T0500Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LAKE CHARLES LA
1054 PM CDT WED MAR 14 2007

THE NATIONAL WEATHER SERVICE IN LAKE CHARLES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  ST. MARY PARISH IN SOUTH CENTRAL LOUISIANA

* UNTIL MIDNIGHT CDT

* AT 1054 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 6 MILES
  SOUTHWEST OF CYPREMORT POINT...AND MOVING EAST AT 35 MPH.

* THE SEVERE THUNDERSTORM EXPECTED TO BE NEAR...
   BALDWIN BY 1115 PM CDT
   FRANKLIN AND CHARENTON BY 1120 PM CDT
   CENTERVILLE BY 1125 PM CDT
   PATTERSON BY 1135 PM CDT
   BAYOU VISTA AND BERWICK BY 1140 PM CDT
   MORGAN CITY BY 1145 PM CDT

SEVERE THUNDERSTORMS PRODUCE WINDS IN EXCESS OF 60 MPH...DESTRUCTIVE
HAIL...DEADLY LIGHTNING AND TORRENTIAL RAIN.

CALL 337-477-5285 TO REPORT SEVERE WEATHER TO THE WEATHER SERVICE.

LAT...LON 2995 9161 2986 9168 2974 9182 2976 9167
      2978 9156 2974 9160 2964 9162 2966 9156
      2963 9154 2953 9151 2955 9145 2956 9144
      2966 9141 2965 9136 2953 9142 2951 9131
      2957 9127 2956 9124 2957 9122 2960 9121
      2962 9118 2961 9116 2963 9110 2971 9111
      2976 9124 2977 9138 2989 9141 2995 9148

$$

K. KUYPER

What forecasters said that day

The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at Mar 14, 9:24 PM CDT, 1 hour 30 minutes earlier.

Area forecast discussion, Mar 14, 9:24 PM CDT, 1 hour 30 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAKE CHARLES LA
924 PM CDT WED MAR 14 2007

.UPDATE...
APEX OF SFC LOW DUE S OF CAMERON THIS EVENING...PROVIDING AN
EXCELLENT FOCUS FOR THE CURRENT SVR SQUALL LINE MOVING ACROSS THE
20-60NM COASTAL MARINE ZONES THIS EVENING.

THE GREATEST THREAT OF SEVERE WEATHER AND HEAVY RAINFALL WILL
REMAIN OFFSHORE...EXCEPT FOR EXTREME SOUTH CENTRAL LOUISIANA
AHEAD OF THE SURFACE LOW. FOR THIS...HAVE DROPPED THE FLASH FLOOD
WATCH FOR ALL OF SOUTHEAST TEXAS...AND LOUISIANA NORTH OF I-10
EXCEPT ST. LANDRY PARISH. THIS IS GOOD UNTIL 1 AM. EXTENDED THE
FLOOD WATCH FOR LOWER ACADIANA THROUGH 4 AM FOR THE FOCUS OF HEAVY
RAIN EXTENDING WELL AFTER MIDNIGHT IN THIS AREA.

NOW...THE ONLY THREAT OF SEVERE WEATHER ACROSS THE ENTIRE AREA
WILL BE SCT THUNDERSTORMS FORMING WITHIN THE UPPER LOW AS IT
MOVES OVER THE REGION TONIGHT. FREEZING LEVELS ARE IN THE
8000-9000FT RANGE ALREADY...AND HAIL COULD BE A RESULT IF ANY
THUNDERSTORM GETS 25 TO 30K FEET. FOR THIS...LEFT 40% N OF I-10.
SOUTH OF THIS AREA...WILL STILL HAVE BLOW OFF -RA/ISO TSRA ACROSS
SE TX/S LA UNTIL MID MORNING THU.

DML

&&

.PREV DISCUSSION... /ISSUED 333 PM CDT WED MAR 14 2007/

SYNOPSIS...THE COMBINATION OF A SLOW MOVING UPPER LEVEL LOW OVER
NORTH TEXAS AND A SURFACE TROUGH OFF THE TEXAS COAST WILL PRODUCE
HEAVY RAINFALL THIS EVENING OVER THE AREA. A SURFACE LOW COULD
FORM OUT OF THE TROUGH AND MOVE INTO SOUTH CENTRAL LOUISIANA LATER TONIGHT.
THIS COULD SERVE TO PROVIDE A FOCUSING MECHANISM AND ADDED SURFACE
CONVERGENCE TO ENHANCE HEAVY RAINFALL OVER THE AREA THIS EVENING.

SHORT TERM...RAIN COOLED AIR SHOULD HELP PUSH TEMPERATURES DOWN
INTO THE UPPER 50S TONIGHT. A DECENT THETA RIDGE AT LOW AND MID
LEVELS WILL HELP TO INCREASE COVERAGE AND INTENSITY OF THE
RAINFALL AS AIR IS LIFTED OVER A WEAK SURFACE BOUNDARY NEAR THE COAST.
EXTENDED THE FLASH FLOOD WATCH UNTIL 1 AM TONIGHT.

CONDITIONS WILL IMPROVE THURSDAY AFTERNOON AFTER SOME WRAPAROUND
MOISTURE GRADUALLY HEADS EASTWARD OUT OF THE AREA WITH THE UPPER LOW.

LONG TERM...A WESTERN UPPER LEVEL RIDGE WILL HELP MAINTAIN DRY
AND COOL CONDITIONS THROUGH THE WEEKEND.

AVIATION...MVFR CIGS WITH TEMPO IFR VIS WITH THE IMBEDDED SHOWERS
AND THUNDERSTORMS. WRAPAROUND MVFR CIGS INTO THURSDAY AFTERNOON.

HYDROLOGY...LEVELS ON PINE ISLAND BAYOU NEAR SOUR LAKE MAY RISE
TO FLOOD LEVELS IF EXPECTED RAINFALL TONIGHT OCCURS OVER AN AREA
WHICH HAS ALREADY SEEN UP TO 5 INCHES OF RAIN. WILL MONITOR WITH
THE RIVER FORECAST CENTER IN FORT WORTH AND UPDATE IF NECESSARY.

&&

.PRELIMINARY POINT TEMPS/POPS...
KLCH  58  77  61  73 /  80  20  10   0
KBPT  57  79  61  75 /  80  20  10   0
KAEX  58  72  60  67 /  60  40  10   0
KLFT  62  70  61  66 /  80  40  10   0

&&

.LCH WATCHES/WARNINGS/ADVISORIES...
LA...FLASH FLOOD WATCH UNTIL 1 AM THURSDAY FOR THE FOLLOWING ZONES:
     ACADIA...CALCASIEU...CAMERON...JEFFERSON DAVIS...AND ST.
     LANDRY.

     FLASH FLOOD WATCH UNTIL 4 AM THURSDAY FOR THE FOLLOWING ZONES:
     IBERIA...LAFAYETTE...LOWER ST. MARTIN...ST. MARY...UPPER
     ST. MARTIN...AND VERMILION.

TX...NONE.
GM...NONE.
&&

Hazardous weather outlook, Mar 14, 5:55 AM CDT, 16 hours 59 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LAKE CHARLES LA
555 AM CDT WED MAR 14 2007

GMZ450-452-455-470-472-475-LAZ027>033-041>045-051>055-TXZ180>182-
201-215-216-151100-
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-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-
555 AM CDT WED MAR 14 2007

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

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS AND A FLOOD WATCH
FOR THE ENTIRE AREA TODAY.

A LARGE COMPLEX OF RAINFALL...WITH EMBEDDED THUNDERSTORMS...IS
PROGRESSING EAST THROUGH THE REGION THIS MORNING. THE MAIN HAZARDS
ASSOCIATED WITH THIS ACTIVITY WILL BE THE THREAT OF HEAVY
RAINFALL...WHICH COULD RESULT IN LOCALIZED FLOODING...AND STRONG
WINDS IN THUNDERSTORMS OVER THE COASTAL WATERS.

ADDITIONAL THUNDERSTORM ACTIVITY MAY DEVELOP LATER THIS
AFTERNOON...WITH THE POTENTIAL FOR DAMAGING WINDS AND ISOLATED
TORNADOES POSSIBLE SHOULD ANY BECOME SEVERE.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

THE CHANCE FOR SHOWERS AND THUNDERSTORMS WILL LINGER OVER EASTERN
AND SOUTHERN PARTS OF THE OUTLOOK AREA ON THURSDAY...BUT NO SEVERE
WEATHER IS ANTICIPATED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

STORM SPOTTER ACTIVATION MAY BE NEEDED TODAY AND TONIGHT.

13

In the hours before

Local storm report, Mar 14, 7:20 PM CDT, 3 hours 34 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAKE CHARLES LA
720 PM CDT WED MAR 14 2007

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0648 PM     MARINE TSTM WIND 39 SSW SEA RIM STATE PA 29.13N 94.19W
03/14/2007  E40.00 MPH       GMZ470             TX   PUBLIC

            REPORTED BY PLATFORM IN HIGH ISLAND BLOCK 199.

0710 PM     MARINE TSTM WIND 18 SSW SEA RIM STATE PA 29.45N 94.16W
03/14/2007  M45.00 MPH       GMZ450             TX   PUBLIC

            REPORTED BY PLATFORM IN HIGH ISLAND BLOCK 52.

&&

MOGGED

Local storm report, Mar 14, 8:38 PM CDT, 2 hours 16 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAKE CHARLES LA
838 PM CDT WED MAR 14 2007

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0802 PM     MARINE TSTM WIND 27 S CONSTANCE BEACH    29.38N 93.55W
03/14/2007  E50 MPH          GMZ470             LA   PUBLIC

            REPORTED BY PLATFORM IN WEST CAMERON BLOCK 165.

0831 PM     MARINE TSTM WIND 34 SSW RUTHERFORD BEACH 29.31N 93.29W
03/14/2007  M41 MPH          GMZ472             LA   PUBLIC

            REPORTED BY PLATFORM IN WEST CAMERON BLOCK 196.

&&

MOGGED

The office that day

Everything else NWS Lake Charles, LA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Mar 14, 7:17 PM CDT	Special Marine Warning	LCH		88 min
Mar 14, 8:43 PM CDT	Special Marine Warning	LCH		2 hr
Mar 14, 9:49 PM CDT	Special Marine Warning	LCH		41 min
Mar 14, 10:20 PM CDT	Special Marine Warning	LCH		55 min
Mar 14, 10:35 PM CDT	Special Marine Warning	LCH		115 min
Mar 14, 11:27 PM CDT	Special Marine Warning	LCH		33 min
Mar 15, 5:15 AM CDT	Dense Fog Advisory	LCH	Beauregard, Vernon	5 hr

Nearby

Severe Thunderstorm Warnings in Louisiana, 2007 Every severe thunderstorm warning in 2007

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.