Alert archive / Louisiana / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 104, NWS Shreveport, LA

April 25, 2007Union Parish, Louisiana

NWS Shreveport, LA issued this severe thunderstorm warning at Apr 25, 2007, 6:27 AM CDT for Union Parish, Louisiana. It was in force for 63 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: Apr 25, 2007, 6:27 AM CDT (11:27 UTC)
Expired: Apr 25, 2007, 7:30 AM CDT
In force: 63 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 11:28 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 00:00Z, 11.5 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: 480 J/kg
Mixed-layer CIN: -213 J/kg
Mixed-layer LCL: 896 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 210 m²/s²
0-3 km storm-relative helicity: 316 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.4

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 Apr 25, 4:14 AM CDT, 2 hours 13 minutes earlier.

Area forecast discussion, Apr 25, 4:14 AM CDT, 2 hours 13 minutes before

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Hazardous weather outlook, Apr 25, 6:25 AM CDT, 2 minutes before

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In the hours before

Local storm report, Apr 25, 3:16 AM CDT, 3 hours 11 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
316 AM CDT WED APR 25 2007

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

0314 AM     FLASH FLOOD      TYLER                   32.33N 95.30W
04/25/2007                   SMITH              TX   BROADCAST MEDIA

            MAJOR STREET FLOODING NEAR HOSPITALS.

&&

JD

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 25, 3:19 AM CDT	Flash Flood Warning	SHV	Smith	4 hr
Apr 25, 4:44 AM CDT	Severe Thunderstorm Warning	SHV	Panola	46 min
Apr 25, 6:50 PM CDT	Severe Thunderstorm Warning	SHV	Panola	40 min
Apr 25, 7:46 AM CDT	Severe Thunderstorm Warning	SHV	Winn	29 min
Apr 25, 1:00 PM CDT	Severe Thunderstorm Warning	SHV	Grant, LaSalle	45 min
Apr 25, 6:18 PM CDT	Severe Thunderstorm Warning	SHV	Bossier, Caddo	27 min
Apr 25, 6:48 PM CDT	Severe Thunderstorm Warning	SHV	Bossier	27 min
Apr 24, 7:31 PM CDT	Severe Thunderstorm Warning	SHV	Howard, Sevier	59 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.