Alert archive / Texas / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 41, NWS Shreveport, LA

February 10, 20134 counties in Texas; Caddo Parish, De Soto Parish, Louisiana

NWS Shreveport, LA issued this severe thunderstorm warning at Feb 10, 2013, 7:39 AM CST for 4 counties in Texas; Caddo Parish, De Soto Parish, Louisiana. It was in force for 51 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: Feb 10, 2013, 7:39 AM CST (13:39 UTC)
Expired: Feb 10, 2013, 8:30 AM CST
In force: 51 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon

Counties Caddo Parish, LA, De Soto Parish, LA, Nacogdoches County, TX, Panola County, TX, Rusk County, TX, Shelby County, TX

The radar

The Shreveport radar (KSHV), 58 km from the middle of the area, began a volume at 13:39 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
Feb 10, 4:18 AM CST	Severe Thunderstorm Watch	SPC	5 hr
Feb 10, 6:58 AM CST	Tornado Watch	SPC	7 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 1.7 hours before the alert went out and 66 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: 323 J/kg
Mixed-layer CIN: -35 J/kg
Mixed-layer LCL: 569 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 384 m²/s²
0-3 km storm-relative helicity: 448 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 5.7

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 Feb 10, 5:11 AM CST, 2 hours 28 minutes earlier.

Area forecast discussion, Feb 10, 5:11 AM CST, 2 hours 28 minutes before

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Hazardous weather outlook, Feb 10, 6:30 AM CST, 1 hour 9 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SHREVEPORT LA
630 AM CST SUN FEB 10 2013

ARZ050-051-059>061-070>073-LAZ001>006-010>014-017>022-OKZ077-
TXZ096-097-108>112-124>126-136>138-149>153-165>167-111230-
SEVIER-HOWARD-LITTLE RIVER-HEMPSTEAD-NEVADA-MILLER-LAFAYETTE-
COLUMBIA-UNION AR-CADDO-BOSSIER-WEBSTER-CLAIBORNE-LINCOLN-
UNION LA-DE SOTO-RED RIVER-BIENVILLE-JACKSON-OUACHITA-SABINE LA-
NATCHITOCHES-WINN-GRANT-CALDWELL-LA SALLE-MCCURTAIN-BOWIE-
FRANKLIN-TITUS-CAMP-MORRIS-CASS-WOOD-UPSHUR-MARION-SMITH-GREGG-
HARRISON-CHEROKEE-RUSK-PANOLA-NACOGDOCHES-SHELBY-ANGELINA-
SAN AUGUSTINE-SABINE TX-
630 AM CST SUN FEB 10 2013

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

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

SHOWERS AND THUNDERSTORMS WILL CONTINUE TO INCREASE AND SPREAD ACROSS
THE FOUR STATE AREA THROUGH TODAY AND INTO TONIGHT...ALL AHEAD OF
A PACIFIC COLD FRONT AND ITS ASSOCIATED UPPER LEVEL STORM SYSTEM
MOVING INTO THE PLAINS. THE PRIMARY THREAT TODAY AND TONIGHT WILL
BE DAMAGING WINDS FROM BOW SEGMENTS OF THUNDERSTORMS ALONG THE
DEVELOPING SQUALL LINE. ISOLATED TORNADOES AND LOCALLY HEAVY
RAINFALL WILL ALSO BE OF CONCERN THROUGH THE DAY AHEAD AS THE
COLD FRONT SLOWLY STALLS ALONG THE I-20 CORRIDOR.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY...

SHOWERS AND THUNDERSTORMS MAY BE ON GOING OVER SOUTHERN SECTIONS
AS WE MOVE INTO THE NEW WORK WEEK AS MORE UPPER LEVEL ENERGY
PUSHES ACROSS THE SOUTHERN PLAINS...OVER RUNNING A STALLED SURFACE
COLD FRONT. THESE ADDITIONAL THUNDERSTORMS MAY BRING A THREAT FOR
HAIL TO THE FOUR STATE AREA...AS THE UPPER LEVEL ENERGY BRINGS
POCKETS OF VERY COLD AIR OVERHEAD...IN THE PERSISTENT SOUTHWEST FLOW
PATTERN ALOFT. IN ADDITION...LOCALLY HEAVY RAINFALL MAY REMAIN A
CONCERN OVER NORTH CENTRAL LOUISIANA...BUT A STRONGER POLAR FRONT
AND ITS UPPER LEVEL STORM SYSTEM WILL BRING AN END TO THUNDERSTORM
ACTIVITY BY EARLY WEDNESDAY. NO OTHER HAZARDOUS WEATHER IS EXPECTED
AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

ACTIVATION OF EMERGENCY MANAGEMENT PERSONNEL...AMATEUR RADIO
OPERATORS...AND STORM SPOTTERS MAY BE NEEDED THROUGH TODAY.

24

In the hours before

Special weather statement, Feb 10, 6:16 AM CST, 1 hour 23 minutes before

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Local storm report, Feb 10, 7:07 AM CST, 32 minutes before

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Special weather statement, Feb 10, 7:23 AM CST, 16 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
723 AM CST SUN FEB 10 2013

LAZ001-010-TXZ150>153-101415-
CADDO-DE SOTO-NACOGDOCHES-PANOLA-RUSK-SHELBY-
723 AM CST SUN FEB 10 2013

...SIGNIFICANT WEATHER ADVISORY...

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A SIGNIFICANT
WEATHER ADVISORY...EFFECTIVE UNTIL 815 AM CST...FOR THE FOLLOWING
COUNTIES AND PARISHES...

IN EASTERN TEXAS...
     NACOGDOCHES AND SHELBY...
IN NORTHEAST TEXAS...
     PANOLA AND RUSK...
IN NORTHWEST LOUISIANA...
     DE SOTO AND CADDO...

INCLUDING THE FOLLOWING LOCATIONS...
     LOGANSPORT...CARTHAGE...JOAQUIN...TENAHA AND TIMPSON...

AT 722 AM CST...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
DETECTING A STRONG THUNDERSTORM 9 MILES SOUTHEAST OF MINDEN...OR 20
MILES SOUTHEAST OF HENDERSON...MOVING EAST AT 50 MPH.

PEA SIZE HAIL...AND WINDS 30 TO 40 MPH ARE EXPECTED WITH THIS STORM.

09

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 10, 4:46 AM CST	Severe Thunderstorm Warning	SHV	Bowie, Franklin, Red River, Titus	59 min
Feb 10, 5:36 AM CST	Severe Thunderstorm Warning	SHV	Cass, Harrison, Marion, Rusk	39 min
Feb 10, 5:42 AM CST	Severe Thunderstorm Warning	SHV	Bowie	48 min
Feb 10, 10:56 AM CST	Severe Thunderstorm Warning	SHV	Grant, Natchitoches, Winn	49 min

Nearby

Severe Thunderstorm Warnings in Texas, 2013 Severe Thunderstorm Warnings in Louisiana, 2013 Every severe thunderstorm warning in 2013

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.