Alert archive / Texas / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 117, NWS Shreveport, LA

May 2, 2007Angelina County, Cherokee County, Nacogdoches County, Texas

NWS Shreveport, LA issued this severe thunderstorm warning at May 2, 2007, 11:46 PM CDT for Angelina County, Cherokee County, Nacogdoches County, Texas. It was in force for 59 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 2, 2007, 11:46 PM CDT (04:46 UTC)
Expired: May 3, 2007, 12:45 AM CDT
In force: 59 min
Issued by: NWS Shreveport, LA
Area: Counties, with a storm outline in the text

Counties Angelina County, TX, Cherokee County, TX, Nacogdoches County, TX

The radar

The Shreveport radar (KSHV), 133 km from the middle of the area, began a volume at 04:50 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 2, 7:59 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 4.8 hours before the alert went out and 141 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: 1137 J/kg
Mixed-layer CIN: -16 J/kg
Mixed-layer LCL: 1161 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 63 m²/s²
0-3 km storm-relative helicity: 170 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 3.8

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 2, 11:46 PM CDT, 0 minutes earlier.

Area forecast discussion, May 2, 11:46 PM CDT, 0 minutes before

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Hazardous weather outlook, May 2, 8:06 PM CDT, 3 hours 40 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SHREVEPORT LA
806 PM CDT WED MAY 2 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>167-031100-
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-
806 PM CDT WED MAY 2 2007

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

.DAY ONE...TONIGHT...

NUMEROUS SEVERE THUNDERSTORMS ARE LIKELY THIS EVENING AS A LARGE
BOW ECHO PUSHES IN ACROSS THE ENTIRE FOUR STATE AREA FROM WEST TO
EAST. DAMAGING WINDS IN EXCESS OF 80 MILES PER HOUR WILL BE POSSIBLE
OVER NORTHEAST TEXAS...SOUTHEAST OKLAHOMA...SOUTHWEST ARKANSAS AND
NORTHWEST LOUISIANA THIS EVENING ALONG WITH LOCALLY HEAVY RAINFALL
AND NEARLY CONTINUOUS DANGEROUS CLOUD TO GROUND LIGHTNING. THIS IS
A PARTICULARLY DANGEROUS EVENT WITH WIDESPREAD WIND DAMAGE
POSSIBLE.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY...

THUNDERSTORMS MAY BECOME MORE NUMEROUS ACROSS EAST TEXAS...SOUTHEAST
OKLAHOMA...SOUTHWEST ARKANSAS...AND WESTERN LOUISIANA THURSDAY
MORNING...AHEAD OF AN UPPER LEVEL DISTURBANCE. ADDITIONAL STORMS WILL
DEVELOP AND BECOME MORE NUMEROUS OVER SOUTHCENTRAL ARKANSAS AND
NORTHCENTRAL LOUISIANA THURSDAY AFTERNOON AS THIS DISTURBANCE ENTERS
EAST TEXAS THURSDAY EVENING. LOCALLY HEAVY RAINFALL WILL ONCE AGAIN
BE POSSIBLE FROM THE STRONGER STORMS...ALTHOUGH ISOLATED STRONG TO
SEVERE THUNDERSTORMS CAN NOT BE RULED OUT.

.SPOTTER INFORMATION STATEMENT...

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

24

In the hours before

Local storm report, May 2, 9:19 PM CDT, 2 hours 27 minutes before

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Local storm report, May 2, 9:27 PM CDT, 2 hours 19 minutes before

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Local storm report, May 2, 9:35 PM CDT, 2 hours 11 minutes before

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Local storm report, May 2, 9:44 PM CDT, 2 hours 2 minutes before

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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 3, 3:49 PM CDT	Tornado Warning	SHV	Ouachita	26 min
May 3, 4:08 PM CDT	Severe Thunderstorm Warning	SHV	Union	46 min

Nearby

Severe Thunderstorm Warnings in Texas, 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.