Alert archive / Texas / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 37, NWS Houston/Galveston, TX

April 19, 2015Austin County, Colorado County, Waller County, Texas

NWS Houston/Galveston, TX issued this severe thunderstorm warning at Apr 19, 2015, 6:27 PM CDT for Austin County, Colorado County, Waller County, Texas. It was in force for 33 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 19, 2015, 6:27 PM CDT (23:27 UTC)
Expired: Apr 19, 2015, 7:00 PM CDT
In force: 33 min
Issued by: NWS Houston/Galveston, TX
Area: Storm-based polygon

Counties Austin County, TX, Colorado County, TX, Waller County, TX

The radar

The Houston radar (KHGX), 122 km from the middle of the area, began a volume at 23:30 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 19, 2:31 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Corpus Christi, TX (KCRP), launched 12:00Z, 11.5 hours before the alert went out and 257 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: 1640 J/kg
Mixed-layer CIN: -115 J/kg
Mixed-layer LCL: 867 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 95 m²/s²
0-3 km storm-relative helicity: 83 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 3.1

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 Apr 19, 3:27 PM CDT, 3 hours earlier.

Area forecast discussion, Apr 19, 3:27 PM CDT, 3 hours before

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Hazardous weather outlook, Apr 19, 6:49 AM CDT, 11 hours 38 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
649 AM CDT SUN APR 19 2015

TXZ163-164-176>179-195>200-211>213-227-201200-
AUSTIN-BRAZOS-BURLESON-FORT BEND-GRIMES-HARRIS-HOUSTON-LIBERTY-
MADISON-MONTGOMERY-POLK-SAN JACINTO-TRINITY-WALKER-WALLER-
WASHINGTON-
649 AM CDT SUN APR 19 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST TEXAS.

.DAY ONE...TODAY AND TONIGHT
A COLD FRONT MOVING INTO THE AREA LATE THIS AFTERNOON MAY BRING
ISOLATED STRONG TO SEVERE THUNDERSTORMS BETWEEN 2 AND 6 PM. THE
PRIMARY THREAT SHOULD BE STRONG GUSTY WINDS AND POSSIBLY SMALL
HAIL. RAINFALL TOTALS SHOULD AVERAGE LESS THAN 0.25 INCH WITH
ISOLATED AMOUNTS ASSOCIATED WITH THE STRONGER STORMS AROUND 1
INCH.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED.

GMZ335-355-TXZ210-214-226-236>238-201200-
BRAZORIA-CHAMBERS-COLORADO-GALVESTON-GALVESTON BAY-MATAGORDA-
WATERS FROM HIGH ISLAND TO FREEPORT OUT 20 NM-WHARTON-
649 AM CDT SUN APR 19 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST TEXAS.

.DAY ONE...TODAY AND TONIGHT
THUNDERSTORMS MAY ARRIVE AFTER 5 PM BRINGING GUSTY NORTHERLY
WINDS AND FREQUENT LIGHTNING.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED.

GMZ330-TXZ235-201200-
JACKSON-MATAGORDA BAY-
649 AM CDT SUN APR 19 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST TEXAS.

.DAY ONE...TODAY AND TONIGHT

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED.

GMZ350-370-375-201200-
WATERS FROM FREEPORT TO THE MATAGORDA SHIP CHANNEL 20 NM TO 60 NM-
WATERS FROM FREEPORT TO THE MATAGORDA SHIP CHANNEL OUT 20 NM-
WATERS FROM HIGH ISLAND TO FREEPORT 20 TO 60 NM-
649 AM CDT SUN APR 19 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST TEXAS.

.DAY ONE...TODAY AND TONIGHT

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED.

In the hours before

Local storm report, Apr 19, 6:04 PM CDT, 23 minutes before

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Local storm report, Apr 19, 6:05 PM CDT, 22 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
605 PM CDT SUN APR 19 2015

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

0604 PM     HAIL             HEMPSTEAD               30.09N  96.08W
04/19/2015  E1.75 INCH       WALLER             TX   PUBLIC

&&

EVENT NUMBER HGX1500114

DO

Local storm report, Apr 19, 6:11 PM CDT, 16 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
611 PM CDT SUN APR 19 2015

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

0610 PM     HAIL             WALLER                  30.06N  95.92W
04/19/2015  M2.00 INCH       WALLER             TX   PUBLIC

&&

EVENT NUMBER HGX1500115

DO

Special weather statement, Apr 19, 6:13 PM CDT, 14 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
613 PM CDT SUN APR 19 2015

TXZ212-213-227-200000-
HARRIS TX-WALLER TX-FORT BEND TX-
613 PM CDT SUN APR 19 2015

...SIGNIFICANT WEATHER ADVISORY FOR WEST CENTRAL HARRIS...
SOUTHEASTERN WALLER AND NORTHERN FORT BEND COUNTIES UNTIL 700 PM
CDT...

AT 612 PM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR
KATY...MOVING EAST AT 20 MPH.

DIME SIZE HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH
THIS STORM.

LOCATIONS IMPACTED INCLUDE...
KATY...SPRING BRANCH NORTH...ADDICKS PARK TEN...SPRING BRANCH WEST...
NORTHERN ELDRIDGE / WEST OAKS...WESTBRANCH...CARVERDALE...FAIRBANKS /
NORTHWEST CROSSING AND SPRING BRANCH CENTRAL.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM CDT FOR
SOUTHEASTERN TEXAS.

LAT...LON 2997 9575 2983 9551 2977 9570 2977 9592
      2994 9595
TIME...MOT...LOC 2312Z 260DEG 18KT 2987 9586

Special weather statement, Apr 19, 6:16 PM CDT, 11 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
616 PM CDT SUN APR 19 2015

TXZ163-164-176-177-192345-
MADISON TX-TRINITY TX-WALKER TX-HOUSTON TX-
616 PM CDT SUN APR 19 2015

...SPECIAL WEATHER STATEMENT...

AT 616 PM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM
CROSSING INTERSTATE 45 ABOUT 12 MILES SOUTHEAST OF MADISONVILLE...
MOVING EAST AT 35 MPH.

UP TO ONE-HALF INCH HAIL WILL BE POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
NORTHWESTERN HUNTSVILLE...TRINITY...RIVERSIDE AND CRABBS PRAIRIE.

THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND
TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL
INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM CDT FOR
SOUTHEASTERN TEXAS.

LAT...LON 3105 9537 3087 9532 3086 9533 3078 9534
      3073 9577 3091 9582
TIME...MOT...LOC 2316Z 256DEG 29KT 3084 9574

40

Special weather statement, Apr 19, 6:21 PM CDT, 6 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
621 PM CDT SUN APR 19 2015

TXZ210>212-192345-
AUSTIN TX-WALLER TX-COLORADO TX-
621 PM CDT SUN APR 19 2015

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN COLORADO...CENTRAL
AUSTIN AND SOUTHWESTERN WALLER COUNTIES UNTIL 645 PM CDT...

AT 621 PM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR
FAYETTEVILLE...OR 12 MILES NORTH OF COLUMBUS...MOVING EAST AT 50 MPH.

UP TO NICKEL SIZE HAIL WILL BE POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
SEALY...BELLVILLE...SAN FELIPE...INDUSTRY...FRELSBURG...CAT SPRING
AND NEW ULM.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM CDT FOR
SOUTHEASTERN TEXAS.

LAT...LON 2996 9657 2998 9658 2999 9658 3000 9606
      2970 9609 2979 9669 2983 9669
TIME...MOT...LOC 2321Z 275DEG 43KT 2988 9659

40

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 18, 8:41 PM CDT	River Flood Warning	HGX	Brazoria	5 days
Apr 18, 8:41 PM CDT	River Flood Warning	HGX	Jackson, Lavaca	17 hr
Apr 18, 8:41 PM CDT	River Flood Warning	HGX	Jackson	57 hr
Apr 18, 9:23 PM CDT	Special Weather Statement	HGX	Brazos, Burleson, Houston, Madison	52 min
Apr 18, 10:15 PM CDT	Special Weather Statement	HGX	Brazos, Grimes, Houston, Madison, Walker, Washington	60 min
Apr 18, 11:04 PM CDT	Special Weather Statement	HGX	Polk, San Jacinto, Trinity	56 min
Apr 18, 11:09 PM CDT	Special Weather Statement	HGX	Austin, Montgomery, Waller	51 min
Apr 18, 11:40 PM CDT	Severe Thunderstorm Warning	HGX	Houston, Polk, San Jacinto, Trinity	40 min
Apr 19, 3:01 PM CDT	Special Weather Statement	HGX	Burleson	44 min
Apr 19, 3:10 PM CDT	Severe Thunderstorm Warning	HGX	Burleson, Washington	50 min
Apr 19, 3:40 PM CDT	Special Weather Statement	HGX	Brazos	35 min
Apr 19, 3:44 PM CDT	Severe Thunderstorm Warning	HGX	Brazos, Burleson, Grimes, Washington	61 min
Apr 19, 3:45 PM CDT	Severe Thunderstorm Warning	HGX	Brazos, Grimes, Madison	30 min
Apr 19, 4:16 PM CDT	Special Weather Statement	HGX	Washington	44 min
Apr 19, 4:22 PM CDT	Special Weather Statement	HGX	Madison	23 min
Apr 19, 4:35 PM CDT	Special Weather Statement	HGX	Washington	40 min
Apr 19, 4:39 PM CDT	Severe Thunderstorm Warning	HGX	Grimes, Houston, Madison, Walker	36 min
Apr 19, 4:46 PM CDT	Severe Thunderstorm Warning	HGX	Grimes, Harris, Waller, Washington	44 min
Apr 19, 4:50 PM CDT	Severe Thunderstorm Warning	HGX	Burleson, Washington	25 min
Apr 19, 4:59 PM CDT	Severe Thunderstorm Warning	HGX	Houston, Trinity	31 min
Apr 19, 5:10 PM CDT	Severe Thunderstorm Warning	HGX	Grimes, Walker	21 min
Apr 19, 5:12 PM CDT	Severe Thunderstorm Warning	HGX	Grimes, Harris, Montgomery, Waller	48 min
Apr 19, 5:16 PM CDT	Severe Thunderstorm Warning	HGX	Houston, Trinity, Walker	29 min
Apr 19, 5:29 PM CDT	Special Weather Statement	HGX	Trinity	31 min
Apr 19, 5:32 PM CDT	Special Weather Statement	HGX	Walker	28 min
Apr 19, 5:47 PM CDT	Severe Thunderstorm Warning	HGX	Grimes, Walker	28 min
Apr 19, 5:55 PM CDT	Severe Thunderstorm Warning	HGX	Harris, Montgomery, Waller	65 min
Apr 19, 5:59 PM CDT	Severe Thunderstorm Warning	HGX	Grimes, Harris, Montgomery, Waller	31 min
Apr 19, 6:13 PM CDT	Special Weather Statement	HGX	Waller	47 min
Apr 19, 6:16 PM CDT	Special Weather Statement	HGX	Walker	29 min
Apr 19, 6:21 PM CDT	Special Weather Statement	HGX	Austin	24 min
Apr 19, 6:31 PM CDT	Areal Flood Advisory	HGX	Harris	119 min
Apr 19, 6:38 PM CDT	Severe Thunderstorm Warning	HGX	Harris, Liberty, Montgomery	37 min
Apr 19, 6:41 PM CDT	Tornado Warning	HGX	Harris, Liberty	34 min
Apr 19, 6:47 PM CDT	Severe Thunderstorm Warning	HGX	Austin, Colorado, Waller	28 min
Apr 19, 6:58 PM CDT	Severe Thunderstorm Warning	HGX	Harris	47 min
Apr 19, 6:59 PM CDT	Severe Thunderstorm Warning	HGX	Austin, Fort Bend, Harris, Waller	31 min

Nearby

Severe Thunderstorm Warnings in Texas, 2015 Every severe thunderstorm warning in 2015

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.