Alert archive / Texas / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 33, NWS Houston/Galveston, TX

April 19, 2015Houston County, Trinity County, Walker County, Texas

NWS Houston/Galveston, TX issued this severe thunderstorm warning at Apr 19, 2015, 5:16 PM CDT for Houston County, Trinity County, Walker County, Texas. It was in force for 29 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, 5:16 PM CDT (22:16 UTC)
Expired: Apr 19, 2015, 5:45 PM CDT
In force: 29 min
Issued by: NWS Houston/Galveston, TX
Area: Storm-based polygon

Counties Houston County, TX, Trinity County, TX, Walker County, TX

The radar

The Houston radar (KHGX), 178 km from the middle of the area, began a volume at 22:19 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

Shreveport, LA (KBAD), launched 12:00Z, 10.3 hours before the alert went out and 221 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 976 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 129 m²/s²
0-3 km storm-relative helicity: 130 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 Apr 19, 3:27 PM CDT, 1 hour 49 minutes earlier.

Area forecast discussion, Apr 19, 3:27 PM CDT, 1 hour 49 minutes before

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Hazardous weather outlook, Apr 19, 6:49 AM CDT, 10 hours 27 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

Special weather statement, Apr 19, 4:16 PM CDT, 1 hour before

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Special weather statement, Apr 19, 4:22 PM CDT, 54 minutes before

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Local storm report, Apr 19, 4:26 PM CDT, 50 minutes before

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Local storm report, Apr 19, 4:30 PM CDT, 46 minutes before

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Special weather statement, Apr 19, 4:35 PM CDT, 41 minutes before

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Local storm report, Apr 19, 4:48 PM CDT, 28 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
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, 5:29 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, 6:27 PM CDT	Severe Thunderstorm Warning	HGX	Austin, Colorado, Waller	33 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.