Alert archive / Louisiana / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 13, NWS Lake Charles, LA

May 17, 2010Avoyelles Parish, Evangeline Parish, Rapides Parish, Louisiana

NWS Lake Charles, LA issued this severe thunderstorm warning at May 17, 2010, 5:41 AM CDT for Avoyelles Parish, Evangeline Parish, Rapides Parish, Louisiana. It was in force for 58 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: May 17, 2010, 5:41 AM CDT (10:41 UTC)
Expired: May 17, 2010, 6:39 AM CDT
In force: 58 min
Issued by: NWS Lake Charles, LA
Area: Storm-based polygon

Counties Avoyelles Parish, LA, Evangeline Parish, LA, Rapides Parish, LA

The nearest sounding before it

Jackson, MS (KJAN), launched 00:00Z, 10.7 hours before the alert went out and 257 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: 1191 J/kg
Mixed-layer CIN: -16 J/kg
Mixed-layer LCL: 900 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 35 m²/s²
0-3 km storm-relative helicity: 76 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.9

Open this sounding in Storm Lab

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 May 17, 5:23 AM CDT, 18 minutes earlier.

Area forecast discussion, May 17, 5:23 AM CDT, 18 minutes before

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Hazardous weather outlook, May 17, 4:59 AM CDT, 42 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LAKE CHARLES LA
459 AM CDT MON MAY 17 2010

GMZ435-LAZ027>033-041>045-051>055-TXZ180>182-201-215-216-181100-
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-
459 AM CDT MON MAY 17 2010

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

SCATTERED SHOWERS AND THUNDERSTORMS EXPECTED TO RE-FIRE UP LATER
TODAY...AS A COLD FRONT ADVANCES INTO NORTHERN LOUISIANA.

ISOLATED SEVERE WEATHER IS POSSIBLE...THE PRIMARY THREATS BEING
LARGE HAIL AND DAMAGING WINDS. LOCALLY HEAVY RAINFALL IS ALSO
POSSIBLE IN THE STRONGER SHOWERS.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

NO HAZARDOUS WEATHER IS ANTICIPATED.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED.

GMZ430-432-450-452-455-470-472-475-181100-
SABINE LAKE-CALCASIEU LAKE-
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-
459 AM CDT MON MAY 17 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF THE NORTHWEST
GULF OF MEXICO.

.DAY ONE...TODAY AND TONIGHT

THE PREDOMINATING WAVES WILL BE LONG-PERIOD SOUTHERLY SWELLS. THE
ACTUAL TIDES WILL BE RUNNING ABOUT A FOOT ABOVE TIDE TABLE VALUES.
SCATTERED SHOWERS AND THUNDERSTORMS ARE POSSIBLE IN THE AFTERNOON
AND EVENING HOURS.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

NO HAZARDOUS WEATHER IS ANTICIPATED.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED.

In the hours before

Special weather statement, May 17, 2:42 AM CDT, 2 hours 59 minutes before

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Special weather statement, May 17, 3:49 AM CDT, 1 hour 52 minutes before

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Local storm report, May 17, 3:53 AM CDT, 1 hour 48 minutes before

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Local storm report, May 17, 5:05 AM CDT, 36 minutes before

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Special weather statement, May 17, 5:18 AM CDT, 23 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
May 17, 3:30 AM CDT	Severe Thunderstorm Warning	LCH	Avoyelles, Rapides, Vernon	60 min
May 17, 4:24 AM CDT	Severe Thunderstorm Warning	LCH	Avoyelles, Evangeline, Rapides, Saint Landry	51 min
May 17, 3:34 PM CDT	Severe Thunderstorm Warning	LCH	Beauregard	56 min
May 17, 4:18 PM CDT	Severe Thunderstorm Warning	LCH	Beauregard, Calcasieu	42 min
May 17, 4:54 PM CDT	Severe Thunderstorm Warning	LCH	Calcasieu	51 min
May 17, 5:17 PM CDT	Special Marine Warning	LCH		28 min
May 17, 5:40 PM CDT	Severe Thunderstorm Warning	LCH	Cameron	38 min
May 17, 5:45 PM CDT	Special Marine Warning	LCH		60 min
May 17, 1:51 PM CDT	Severe Thunderstorm Warning	LCH	Tyler	39 min
May 17, 2:00 PM CDT	Severe Thunderstorm Warning	LCH	Jasper, Tyler	60 min
May 17, 2:27 PM CDT	Severe Thunderstorm Warning	LCH	Jasper, Tyler	48 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2010 Every severe thunderstorm warning in 2010

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.