Alert archive / Louisiana / Severe Thunderstorm Warnings in 2006

Severe Thunderstorm Warning 209, NWS Shreveport, LA

July 19, 2006LaSalle Parish, Louisiana

NWS Shreveport, LA issued this severe thunderstorm warning at Jul 19, 2006, 4:51 PM CDT for LaSalle Parish, Louisiana. It was in force for 69 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: Jul 19, 2006, 4:51 PM CDT (21:51 UTC)
Expired: Jul 19, 2006, 6:00 PM CDT
In force: 69 min
Issued by: NWS Shreveport, LA
Area: Counties, with a storm outline in the text

County LaSalle Parish, LA

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 9.9 hours before the alert went out and 174 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: 3200 J/kg
Mixed-layer CIN: -68 J/kg
Mixed-layer LCL: 1062 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: -54 m²/s²
0-3 km storm-relative helicity: -17 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.3

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 Shreveport, LA wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 19, 4:15 PM CDT, 36 minutes earlier.

Area forecast discussion, Jul 19, 4:15 PM CDT, 36 minutes before

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Hazardous weather outlook, Jul 19, 2:32 PM CDT, 2 hours 19 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE SHREVEPORT LA
232 PM CDT WED JUL 19 2006

ARZ050-051-059>061-070>073-LAZ001>006-010>014-017>022-OKZ077-TXZ096-
097-108>112-124>126-136>138-149>153-165>167-201100-
ANGELINA-BIENVILLE-BOSSIER-BOWIE-CADDO-CALDWELL-CAMP-CASS-CHEROKEE-
CLAIBORNE-COLUMBIA-DE SOTO-FRANKLIN-GRANT-GREGG-HARRISON-HEMPSTEAD-
HOWARD-JACKSON-LA SALLE-LAFAYETTE-LINCOLN-LITTLE RIVER-MARION-
MCCURTAIN-MILLER-MORRIS-NACOGDOCHES-NATCHITOCHES-NEVADA-OUACHITA-
PANOLA-RED RIVER LA-RED RIVER TX-RUSK-SABINE LA-SABINE TX-
SAN AUGUSTINE-SEVIER-SHELBY-SMITH-TITUS-UNION AR-UNION LA-UPSHUR-
WEBSTER-WINN-WOOD-
232 PM CDT WED JUL 19 2006

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST OKLAHOMA...NORTHEAST
TEXAS...SOUTHWEST ARKANSAS...NORTHWEST...AND NORTH CENTRAL LOUISIANA.

.DAY ONE...THIS AFTERNOON AND TONIGHT...

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THROUGH THIS EVENING
ACROSS CENTRAL AND NORTHEAST LOUISIANA...GENERALLY EAST OF A LINE
FROM MANY LOUISIANA TO EL DORADO ARKANSAS.  THE MAIN RISK FROM ANY
SEVERE THUNDERSTORMS WILL BE DAMAGING WINDS IN EXCESS OF 60 MILES
AN HOUR...WITH A SMALLER RISK FOR SEEING HAIL LARGER THAN THREE
QUARTERS OF AN INCH.

OUTSIDE OF THIS AREA...ISOLATED TO SCATTERED THUNDERSTORMS WILL BE
POSSIBLE WEST OF THIS AREA...MAINLY ACROSS NORTHWEST LOUISIANA AND
NORTHEAST TEXAS...ALONG AND SOUTH OF INTERSTATE 20.

AN UPPER LEVEL DISTURBANCE...MOVING SOUTHWEST ACROSS MISSISSIPPI
HAS RESULTED IN RAPID THUNDERSTORM DEVELOPMENT EAST OF THE
MISSISSIPPI RIVER.  THESE THUNDERSTORMS ARE EXPECTED TO MOVE
SOUTHWEST...AND COULD AFFECT COMMUNITIES ALONG THE HIGHWAY 165
CORRIDOR BEFORE SUNSET.  WITH THE VERY WARM...MOIST...AND UNSTABLE
AIRMASS IN PLACE...SEVERE STORMS WILL BE POSSIBLE OVER PARTS OF
EASTERN LOUISIANA.

THE THUNDERSTORMS ARE EXPECTED TO WEAKEN AFTER SUNSET.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY...

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

HOWEVER...ISOLATED SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE OVER
THE ENTIRE FOUR STATE REGION AS WE MOVE INTO THE WEEKEND. A WEAK
UPPER LEVEL DISTURBANCE IS FORECAST TO DRIFT INTO THE REGION FROM THE
NORTH AND INTERACT WITH AMPLE MOISTURE AND INSTABILITY.

.SPOTTER INFORMATION STATEMENT...

THE ACTIVATION OF EMERGENCY MANAGERS...SKYWARN NETWORKS...AND STORM
SPOTTERS MAY BE NEEDED LATE THIS AFTERNOON AND EVENING EAST OF
INTERSTATE 49.

BUTTS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 19, 5:26 PM CDT	Severe Thunderstorm Warning	SHV	Caldwell	34 min
Jul 19, 5:39 PM CDT	Severe Thunderstorm Warning	SHV	Grant, Winn	36 min
Jul 19, 6:08 PM CDT	Severe Thunderstorm Warning	SHV	Caldwell, Ouachita	37 min
Jul 19, 6:15 PM CDT	Severe Thunderstorm Warning	SHV	Bienville, Grant, Jackson, Natchitoches, Winn	30 min
Jul 19, 6:48 PM CDT	Severe Thunderstorm Warning	SHV	Bienville, Grant, Jackson, Natchitoches, Winn	42 min
Jul 19, 6:53 PM CDT	Severe Thunderstorm Warning	SHV	Hempstead	67 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2006 Every severe thunderstorm warning in 2006

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.