Alert archive / Texas / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 14, NWS Houston/Galveston, TX

March 20, 20134 counties in Texas

NWS Houston/Galveston, TX issued this severe thunderstorm warning at Mar 20, 2013, 5:00 AM CDT for 4 counties in Texas. It was in force for 30 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: Mar 20, 2013, 5:00 AM CDT (10:00 UTC)
Expired: Mar 20, 2013, 5:30 AM CDT
In force: 30 min
Issued by: NWS Houston/Galveston, TX
Area: Storm-based polygon

Counties Brazoria County, TX, Fort Bend County, TX, Matagorda County, TX, Wharton County, TX

The radar

The Houston radar (KHGX), 82 km from the middle of the area, began a volume at 10:01 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

Corpus Christi, TX (KCRP), launched 00:00Z, 10.0 hours before the alert went out and 218 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: 268 J/kg
Mixed-layer CIN: -399 J/kg
Mixed-layer LCL: 943 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 77 m²/s²
0-3 km storm-relative helicity: 207 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 Houston/Galveston, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at Mar 20, 4:41 AM CDT, 19 minutes earlier.

Area forecast discussion, Mar 20, 4:41 AM CDT, 19 minutes before

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Hazardous weather outlook, Mar 19, 1:07 PM CDT, 15 hours 53 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
107 PM CDT TUE MAR 19 2013

TXZ163-164-176>179-195>200-210>214-226-227-235>238-201200-
AUSTIN-BRAZORIA-BRAZOS-BURLESON-CHAMBERS-COLORADO-FORT BEND-
GALVESTON-GRIMES-HARRIS-HOUSTON-JACKSON-LIBERTY-MADISON-MATAGORDA-
MONTGOMERY-POLK-SAN JACINTO-TRINITY-WALKER-WALLER-WASHINGTON-
WHARTON-
107 PM CDT TUE MAR 19 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST TEXAS.

.DAY ONE...TONIGHT

AN UPPER LEVEL DISTURBANCE IS EXPECTED TO MOVE INTO THE AREA
TONIGHT AND INTERACT WITH A STATIONARY FRONT. THERE IS A SLIGHT
RISK OF SEVERE THUNDERSTORMS GENERALLY WEST OF A COLUMBUS TO
HUNTSVILLE TO CROCKETT LINE TONIGHT. THE MAIN THREAT IN THIS AREA
IS LARGE HAIL BETWEEN 10 PM AND 5 AM WEDNESDAY. ELSEWHERE...A FEW
STRONG STORMS ARE POSSIBLE TONIGHT CAPABLE OF SMALL HAIL...BRIEF
HEAVY RAINFALL AND LIGHTNING.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS POSSIBLE TONIGHT.

In the hours before

Local storm report, Mar 20, 1:18 AM CDT, 3 hours 42 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
118 AM CDT WED MAR 20 2013

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

1258 AM     HAIL             9 WNW SOMERVILLE        30.40N 96.67W
03/20/2013  E1.00 INCH       BURLESON           TX   TRAINED SPOTTER

            TRAINED SPOTTER REPORTED 1 INCH DIAMETER HAIL VIA
            SPOTTERNETWORK 9 MILES ENE OF DIME BOX.

0101 AM     HAIL             8 WNW SOMERVILLE        30.39N 96.65W
03/20/2013  E1.50 INCH       BURLESON           TX   TRAINED SPOTTER

            REPORTED PING PONG BALL SIZE HAIL 8 MILES WNW OF
            SOMERVILLE.

0108 AM     TSTM WND GST     7 WNW SOMERVILLE        30.38N 96.64W
03/20/2013  E60.00 MPH       BURLESON           TX   TRAINED SPOTTER

            TRAINED SPOTTER ESTIMATED 60 MPH WIND GUST NEARLY BLOWING
            VEHICLE OF THE ROAD.

0114 AM     HAIL             BURTON                  30.18N 96.60W
03/20/2013  E1.75 INCH       WASHINGTON         TX   LAW ENFORCEMENT

            GOLF BALL SIZE HAIL IN BURTON VIA COUNTY SHERIFF.

&&

OVERPECK

Local storm report, Mar 20, 1:56 AM CDT, 3 hours 4 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
156 AM CDT WED MAR 20 2013

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

0150 AM     HAIL             BELLVILLE               29.95N 96.26W
03/20/2013  E1.75 INCH       AUSTIN             TX   LAW ENFORCEMENT

            GOLF BALL SIZE HAIL REPORTED AT COUNTY SHERRIFFS OFFICE.

&&

OVERPECK

Special weather statement, Mar 20, 3:19 AM CDT, 1 hour 41 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
319 AM CDT WED MAR 20 2013

TXZ213-227-237-200915-
BRAZORIA TX-FORT BEND TX-HARRIS TX-
319 AM CDT WED MAR 20 2013

...SIGNIFICANT WEATHER ADVISORY FOR NORTH CENTRAL BRAZORIA...EASTERN
FORT BEND AND SOUTHWESTERN HARRIS COUNTIES UNTIL 415 AM CDT...

AT 314 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
A STRONG THUNDERSTORM NEAR SUGAR LAND...MOVING SOUTHEAST AT 25 MPH.

HAIL UP TO THE SIZE OF PEAS AND WIND GUSTS UP TO 40 MPH WILL BE
POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
MISSOURI CITY...PEARLAND...MISSION BEND...SUGAR LAND...FIRST
COLONY...STAFFORD...TOWN WEST...MEADOWS...FRESNO...MANVEL...
BROOKSIDE VILLAGE...ARCOLA AND IOWA COLONY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

&&

LAT...LON 2934 9545 2963 9572 2979 9561 2955 9523
TIME...MOT...LOC 0814Z 302DEG 22KT 2960 9562

39

Special weather statement, Mar 20, 4:48 AM CDT, 12 minutes before

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The office that day

Everything else NWS Houston/Galveston, TX issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Mar 20, 12:44 AM CDT	Severe Thunderstorm Warning	HGX	Burleson, Washington	31 min
Mar 20, 1:07 AM CDT	Severe Thunderstorm Warning	HGX	Austin, Washington	23 min
Mar 20, 1:23 AM CDT	Severe Thunderstorm Warning	HGX	Austin, Washington	37 min
Mar 20, 1:58 AM CDT	Severe Thunderstorm Warning	HGX	Austin, Waller	32 min
Mar 20, 2:28 AM CDT	Severe Thunderstorm Warning	HGX	Austin, Fort Bend, Harris, Waller	47 min
Mar 20, 3:19 AM CDT	Special Weather Statement	HGX	Fort Bend	56 min
Mar 20, 3:55 AM CDT	Small Craft Advisory	HGX		20 hr
Mar 20, 4:15 AM CDT	Severe Thunderstorm Warning	HGX	Austin, Colorado, Washington	30 min
Mar 20, 4:48 AM CDT	Special Weather Statement	HGX	Wharton	42 min
Mar 20, 5:30 AM CDT	Severe Thunderstorm Warning	HGX	Brazoria, Fort Bend, Wharton	30 min
Mar 20, 6:00 AM CDT	Special Weather Statement	HGX	Brazoria	30 min

Nearby

Severe Thunderstorm Warnings in Texas, 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.