Alert archive / Louisiana / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 118, NWS Shreveport, LA

May 3, 2007Union Parish, Louisiana

NWS Shreveport, LA issued this severe thunderstorm warning at May 3, 2007, 4:08 PM CDT for Union Parish, Louisiana. It was in force for 46 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 3, 2007, 4:08 PM CDT (21:08 UTC)
Expired: May 3, 2007, 4:54 PM CDT
In force: 46 min
Issued by: NWS Shreveport, LA
Area: Counties, with a storm outline in the text

County Union Parish, LA

The radar

The Shreveport radar (KSHV), 144 km from the middle of the area, began a volume at 21:11 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 9.1 hours before the alert went out and 135 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: 1 J/kg
Mixed-layer CIN: -265 J/kg
Mixed-layer LCL: 691 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 122 m²/s²
0-3 km storm-relative helicity: 112 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 May 3, 3:58 PM CDT, 10 minutes earlier.

Area forecast discussion, May 3, 3:58 PM CDT, 10 minutes before

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Hazardous weather outlook, May 3, 12:00 PM CDT, 4 hours 8 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SHREVEPORT LA
1200 PM CDT THU MAY 3 2007

ARZ050-051-059>061-070>073-LAZ001>006-010>014-017>022-OKZ077-TXZ096-
097-108>112-124>126-136>138-149>153-165>167-041100-
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-
1200 PM CDT THU MAY 3 2007

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

.DAY ONE...TODAY AND TONIGHT...

AN UPPER LEVEL LOW PRESSURE SYSTEM WILL CONTINUE MOVING EASTWARD
ACROSS NORTH TEXAS. SHOWERS AND THUNDERSTORMS DEVELOPING ON THE EAST
SIDE OF THE LOW WILL SPREAD EASTWARD ACROSS NORTHEAST
TEXAS...SOUTHEAST OKLAHOMA...NORTHWEST LOUISIANA...AND SOUTHWEST
ARKANSAS THIS AFTERNOON AND TONIGHT. THERE IS A SLIGHT RISK OF
SEVERE THUNDERSTORMS ACROSS MOST OF THE AREA...WITH THE MAIN THREAT
BEING DAMAGING HAIL AND HIGH WIND GUSTS FROM ANY SEVERE THUNDERSTORM
THAT MAY OCCUR. LOCALLY HEAVY RAINFALL WILL ALSO RESULT IN PONDING
OF WATER IN LOW LYING AREAS.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY...

THUNDERSTORMS WILL BE ENDING FROM WEST TO EAST EARLY FRIDAY.
NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

ACTIVATION OF EMERGENCY MANAGERS...SKYWARN NETWORKS...AND STORM
SPOTTERS...MAY BE NEEDED TODAY AND TONIGHT.

17

The office that day

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

Issued	Product	Office	Counties	Lasted
May 2, 8:08 PM CDT	Severe Thunderstorm Warning	SHV	Wood	52 min
May 2, 8:15 PM CDT	Severe Thunderstorm Warning	SHV	Smith	45 min
May 2, 8:41 PM CDT	Severe Thunderstorm Warning	SHV	Camp, Franklin, Titus, Upshur	49 min
May 2, 9:03 PM CDT	Severe Thunderstorm Warning	SHV	Gregg	42 min
May 2, 9:09 PM CDT	Severe Thunderstorm Warning	SHV	Smith	36 min
May 2, 11:46 PM CDT	Severe Thunderstorm Warning	SHV	Angelina, Cherokee, Nacogdoches	59 min
May 3, 3:49 PM CDT	Tornado Warning	SHV	Ouachita	26 min

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; radar from the NEXRAD Level II archive.