Alert archive / Texas / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 74, NWS Shreveport, LA

April 24, 20106 counties in Texas

NWS Shreveport, LA issued this severe thunderstorm warning at Apr 24, 2010, 2:41 AM CDT for 6 counties in Texas. It was in force for 49 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 24, 2010, 2:41 AM CDT (07:41 UTC)
Expired: Apr 24, 2010, 3:30 AM CDT
In force: 49 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon

Counties Camp County, TX, Franklin County, TX, Gregg County, TX, Morris County, TX, Titus County, TX, Upshur County, TX

The radar

The Shreveport radar (KSHV), 117 km from the middle of the area, began a volume at 07:42 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
Apr 23, 5:41 PM CDT	Tornado Watch	SPC	9 hr
Apr 24, 1:50 AM CDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 7.7 hours before the alert went out and 123 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: 2092 J/kg
Mixed-layer CIN: -15 J/kg
Mixed-layer LCL: 810 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 155 m²/s²
0-3 km storm-relative helicity: 153 m²/s²
Significant tornado parameter: 1.6
Supercell composite: 8.6

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 24, 2:14 AM CDT, 27 minutes earlier.

Area forecast discussion, Apr 24, 2:14 AM CDT, 27 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SHREVEPORT LA
214 AM CDT SAT APR 24 2010

.UPDATE...
ZONE UPDATE JUST SENT FOR THE ISSUANCE OF TORNADO WATCH #89 FOR
THE ENTIRE FOUR STATE REGION UNTIL 13Z. A DERECHO HAS DEVELOPED
ACROSS ECNTRL TX THIS MORNING...AND HAS ALREADY MOVED E OF THE
NEARLY STATIONARY SFC BNDRY/PSEUDO DRYLINE IN PLACE FROM ERN OK
INTO ECNTRL TX. HAVE ALREADY SEEN AN 87 MPH WIND GUSTS IN CRS WITH
THESE STORMS. THE LOW LEVEL AIRMASS HAS BEEN WORKED OVER ACROSS
EXTREME NE TX/SE OK/SW AR FROM EARLIER CONVECTION...BUT REMAINS
MODERATELY UNSTABLE FARTHER S ALONG/S OF THE I-20 CORRIDOR. THE
ONLY PROBLEM REMAINS THE EXTENT OF CAPPING...AS SEEN ON THE KSHV
06Z RAOB. LARGE SCALE FORCING IS EXPECTED TO SPREAD NE ALONG THE
STALLED SFC FRONT THROUGH SUNRISE...WITH ADDITIONAL STRENGTHENING
POSSIBLE AS THE SRLY LLJ INCREASES. DISCRETE CELL FORMATION AHEAD
OF THE MAIN LINE REMAINS PROBABLY YET UNCERTAIN...GIVEN THE
STRENGTH OF THE CAP. BUT IN ANY CASE...SHOULD THIS DERECHO
MOVE/BUILD S INTO THE MORE UNSTABLE AIR MASS TO THE S...EXPECT
VERY SVR WINDS TO CONTINUE TO SPREAD E ACROSS MUCH OF THE AREA
THROUGHOUT THE MORNING.

THE MORNING DISCUSSION WILL COVER ANY CHANGES TO THE CURRENT
FORECAST.

15

&&

.PRELIMINARY POINT TEMPS/POPS...
SHV  77  56  78  54  80 /  70  10  10  10  10
MLU  79  55  77  54  75 /  70  20  10  10  10
DEQ  75  52  73  50  73 /  60  10  10  10  10
TXK  76  56  75  53  76 /  60  10  10  10  10
ELD  76  54  76  52  78 /  70  20  10  10  10
TYR  79  52  77  53  80 /  70  10  10  10  10
GGG  78  54  78  54  80 /  70  10  10  10  10
LFK  80  54  80  52  82 /  70  10  10  10  10

&&

.SHV WATCHES/WARNINGS/ADVISORIES...
AR...NONE.
LA...NONE.
OK...NONE.
TX...NONE.
&&

15

Hazardous weather outlook, Apr 23, 12:05 PM CDT, 14 hours 36 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SHREVEPORT LA
1205 PM CDT FRI APR 23 2010

ARZ050-051-059>061-070>073-LAZ001>006-010>014-017>022-OKZ077-
TXZ096-097-108>112-124>126-136>138-149>153-165>167-241200-
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-
1205 PM CDT FRI APR 23 2010

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

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

A VIGOROUS STORM SYSTEM IS FORECAST TO MOVE ACROSS THE REGION
THIS AFTERNOON AND TONIGHT. THE FIRST WAVE OF STORMS WILL AFFECT
THE FOUR STATE AREA THIS AFTERNOON...WITH THE SECONDARY MAIN
STORM SYSTEM TO MOVE INTO NORTHEAST AND EAST TEXAS LATE TONIGHT. A
COMBINATION OF UNSTABLE AIR...STRONG WIND SHEAR...AND ABUNDANT LOW
LEVEL MOISTURE WILL ALLOW FOR AN ENVIRONMENT CONDUCIVE TO STRONG
TO SEVERE THUNDERSTORMS...WITH THE MAIN THREAT BEING DAMAGING
WINDS...HAIL...AND ISOLATED TORNADOES.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY...

A SECONDARY UPPER-LEVEL DISTURBANCE WILL ALLOW FOR A CONTINUED
THREAT OF SEVERE WEATHER SATURDAY MORNING UNTIL ABOUT NOON ACROSS
THE MAJORITY OF THE FOUR STATE REGION. RAINFALL AMOUNTS
APPROACHING THREE INCHES CAN BE EXPECTED ALONG A LINE FROM
JACKSONVILLE TEXAS...THROUGH SHREVEPORT...AND INTO EL DORADO
ARKANSAS. ALONG WITH HEAVY RAINFALL...DAMAGING WINDS AND ISOLATED
TORNADOES WILL BE POSSIBLE SATURDAY MORNING.

.SPOTTER INFORMATION STATEMENT...

STORM SPOTTERS...HAM RADIO OPERATORS...AND EMERGENCY MANAGEMENT
OFFICIALS MAY BE ACTIVATED ANYTIME FROM THIS AFTERNOON THROUGH
SATURDAY MORNING.

03

In the hours before

Special weather statement, Apr 23, 9:33 PM CDT, 5 hours 8 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
933 PM CDT FRI APR 23 2010

ARZ070-071-TXZ112-240315-
CASS-LAFAYETTE-MILLER-
933 PM CDT FRI APR 23 2010

...SIGNIFICANT WEATHER ADVISORY...

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A SIGNIFICANT
WEATHER ADVISORY...EFFECTIVE UNTIL 1015 PM CDT...FOR THE FOLLOWING
COUNTIES...

IN SOUTHWEST ARKANSAS...
     LAFAYETTE AND MILLER...
IN NORTHEAST TEXAS...
     CASS...

INCLUDING THE FOLLOWING LOCATIONS...
     BRIGHTSTAR...DODDRIDGE AND RAVANNA...

AT 933 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS ARE TRACKING
A STRONG THUNDERSTORM NEAR RAVANNA...OR 8 MILES SOUTHEAST OF
ATLANTA...MOVING EAST AT 20 MPH.

DIME SIZE HAIL...AND WINDS AROUND 40 MPH ARE EXPECTED WITH THIS
STORM.

13

Special weather statement, Apr 23, 9:41 PM CDT, 5 hours before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
941 PM CDT FRI APR 23 2010

TXZ125-126-137-138-240345-
GREGG-HARRISON-MARION-UPSHUR-
941 PM CDT FRI APR 23 2010

...SIGNIFICANT WEATHER ADVISORY...

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A SIGNIFICANT
WEATHER ADVISORY...EFFECTIVE UNTIL 1045 PM CDT...FOR THE FOLLOWING
COUNTIES...

IN NORTHEAST TEXAS...
     UPSHUR...MARION...HARRISON AND GREGG...

INCLUDING THE FOLLOWING LOCATIONS...
     BEREA...DIANA...HARLETON...JEFFERSON AND WOODLAWN...

AT 940 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS ARE TRACKING
A STRONG THUNDERSTORM 6 MILES SOUTH OF DIANA...OR 7 MILES NORTH OF
LONGVIEW...MOVING NORTHEAST AT 25 MPH. ANOTHER STRONG THUNDERSTORM
WAS DEVELOPING JUST WEST OF THE NESBITT COMMUNITY...AND WAS MOVING
NORTH NORTHEAST AROUND 35 MPH.

HALF TO THREE QUARTER INCH DIAMETER HAIL...AND WINDS 30 TO 40 MPH ARE
EXPECTED WITH THESE STORMS. SHOULD THESE STORMS INTENSIFY...A SEVERE
THUNDERSTORM WARNING WILL BE NEEDED.

15

Local storm report, Apr 23, 9:42 PM CDT, 4 hours 59 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
942 PM CDT FRI APR 23 2010

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

0812 PM     FUNNEL CLOUD     FOUKE                   33.26N 93.89W
04/23/2010                   MILLER             AR   PUBLIC

            A FUNNEL CLOUD WAS REPORTED CROSSING HWY 549 NEAR FOUKE
            BY A MOTORIST.

0811 PM     TSTM WND DMG     FOUKE                   33.26N 93.89W
04/23/2010                   MILLER             AR   LAW ENFORCEMENT

            A POWERLINE WAS REPORTED DOWN IN THE COMMUNITY OF FOUKE.

&&

18

Local storm report, Apr 23, 10:11 PM CDT, 4 hours 30 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
1011 PM CDT FRI APR 23 2010

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

0742 PM     TSTM WND DMG     ATLANTA                 33.12N 94.16W
04/23/2010                   CASS               TX   EMERGENCY MNGR

            A TREE WAS REPORTED DOWN ACROSS HWY 251 NEAR HWY 77 ON
            THE SOUTH END OF ATLANTA.

&&

18

Special weather statement, Apr 23, 10:14 PM CDT, 4 hours 27 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
1014 PM CDT FRI APR 23 2010

ARZ061-072-240345-
COLUMBIA-NEVADA-
1014 PM CDT FRI APR 23 2010

...SIGNIFICANT WEATHER ADVISORY...

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A SIGNIFICANT
WEATHER ADVISORY...EFFECTIVE UNTIL 1045 PM CDT...FOR THE FOLLOWING
COUNTIES...

IN SOUTHWEST ARKANSAS...
     NEVADA AND COLUMBIA...

INCLUDING THE FOLLOWING LOCATIONS...
     COLLEGE HILL...

AT 1014 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS ARE TRACKING
A STRONG THUNDERSTORM 6 MILES NORTH OF MCNEIL...MOVING EAST AT 40
MPH.

DIME SIZE HAIL...AND WINDS AROUND 40 MPH ARE EXPECTED WITH THIS
STORM.

13

Local storm report, Apr 23, 11:30 PM CDT, 3 hours 11 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
1130 PM CDT FRI APR 23 2010

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

1010 PM     TSTM WND DMG     8 W JEFFERSON           32.76N 94.49W
04/23/2010                   MARION             TX   EMERGENCY MNGR

            TREES REPORTED DOWN ALONG HWY 726 JUST EAST OF LAKE O THE
            PINES.

&&

18

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 23, 7:30 PM CDT	Tornado Warning	SHV	Cass	45 min
Apr 23, 8:32 PM CDT	Severe Thunderstorm Warning	SHV	Cherokee, Rusk	58 min
Apr 23, 8:42 PM CDT	Tornado Warning	SHV	Cherokee, Rusk	48 min
Apr 23, 8:47 PM CDT	Severe Thunderstorm Warning	SHV	Angelina, Cherokee, Nacogdoches	40 min
Apr 24, 1:57 AM CDT	Severe Thunderstorm Warning	SHV	Smith, Wood	63 min
Apr 24, 2:27 AM CDT	Tornado Warning	SHV	Wood	19 min
Apr 24, 3:06 AM CDT	Lake Wind Advisory	SHV	Angelina, Bowie, Camp, Cass, Cherokee, Franklin and 15 more	18 hr
Apr 24, 3:14 AM CDT	Severe Thunderstorm Warning	SHV	Bowie, Cass, Harrison, Marion, Red River	46 min
Apr 24, 7:43 AM CDT	Severe Thunderstorm Warning	SHV	Sabine	47 min
Apr 24, 5:25 AM CDT	Severe Thunderstorm Warning	SHV	Union	50 min
Apr 24, 5:40 AM CDT	Severe Thunderstorm Warning	SHV	Bossier, Caddo, Webster	35 min
Apr 24, 5:51 AM CDT	Tornado Warning	SHV	Bossier, Claiborne, Webster	39 min
Apr 24, 5:54 AM CDT	Severe Thunderstorm Warning	SHV	Bienville, Claiborne, Lincoln, Union	51 min
Apr 24, 6:23 AM CDT	Tornado Warning	SHV	Lincoln, Union	52 min
Apr 24, 7:07 AM CDT	Severe Thunderstorm Warning	SHV	Union	38 min
Apr 24, 7:12 AM CDT	Tornado Warning	SHV	Union	33 min
Apr 24, 7:23 AM CDT	Severe Thunderstorm Warning	SHV	De Soto, Natchitoches, Red River, Sabine	52 min
Apr 24, 8:01 AM CDT	Severe Thunderstorm Warning	SHV	Bienville, Jackson, Lincoln, Natchitoches, Red River, Winn	44 min
Apr 24, 8:38 AM CDT	Severe Thunderstorm Warning	SHV	Grant, Jackson, Natchitoches, Winn	52 min
Apr 23, 7:22 PM CDT	Severe Thunderstorm Warning	SHV	Hempstead, Nevada	38 min
Apr 23, 7:45 PM CDT	Tornado Warning	SHV	Hempstead, Nevada	45 min
Apr 23, 8:12 PM CDT	Tornado Warning	SHV	Lafayette, Miller	48 min
Apr 24, 3:55 AM CDT	Severe Thunderstorm Warning	SHV	Hempstead, Howard, Little River, Nevada, Sevier	50 min

Nearby

Severe Thunderstorm Warnings in Texas, 2010 Every severe thunderstorm warning in 2010

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.