Alert archive / Texas / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 121, NWS Houston/Galveston, TX

May 30, 2015Trinity County, Texas

NWS Houston/Galveston, TX issued this severe thunderstorm warning at May 30, 2015, 6:50 PM CDT for Trinity County, Texas. It was in force for 40 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: May 30, 2015, 6:50 PM CDT (23:50 UTC)
Expired: May 30, 2015, 7:30 PM CDT
In force: 40 min
Issued by: NWS Houston/Galveston, TX
Area: Storm-based polygon

County Trinity County, TX

The radar

The Houston radar (KHGX), 180 km from the middle of the area, began a volume at 23:53 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

Shreveport, LA (KBAD), launched 12:00Z, 11.8 hours before the alert went out and 203 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: 1281 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 775 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 69 m²/s²
0-3 km storm-relative helicity: 59 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 May 30, 6:47 PM CDT, 3 minutes earlier.

Area forecast discussion, May 30, 6:47 PM CDT, 3 minutes before

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Hazardous weather outlook, May 30, 5:54 AM CDT, 12 hours 56 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
554 AM CDT SAT MAY 30 2015

TXZ163-164-176>179-195>200-210>214-226-227-235>238-311100-
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-
554 AM CDT SAT MAY 30 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST TEXAS.

.DAY ONE...TODAY AND TONIGHT

A SERIES OF UPPER LEVEL DISTURBANCES MOVING ACROSS THE AREA IN
COMBINATION WITH A SOUTHWARD SAGGING COLD FRONT...ABUNDANT
MOISTURE AND THE SEA BREEZE COULD SUPPORT MORE THUNDERSTORM
ACTIVITY AND LOCALLY HEAVY RAINFALL OVER THE WEEKEND. WITH GROUNDS
ALREADY SATURATED...ANY ADDITIONAL RAINFALL WILL RUN OFF AND CAUSE
FLOODING PROBLEMS. A FLASH FLOOD WATCH HAS BEEN ISSUED FOR
SATURDAY AFTERNOON THROUGH SUNDAY MORNING. ANY RAINFALL AMOUNTS
OVER 3 INCHES WILL LIKELY CAUSE FLOODING. ADDITIONAL RAINFALL
RUNNING OFF INTO BAYOUS AND RIVERS WILL LIKELY PROLONG FLOODING IN
THOSE AREAS.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED.

In the hours before

Local storm report, May 30, 6:05 PM CDT, 45 minutes before

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Special weather statement, May 30, 6:14 PM CDT, 36 minutes before

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Local storm report, May 30, 6:15 PM CDT, 35 minutes before

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Local storm report, May 30, 6:23 PM CDT, 27 minutes before

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Local storm report, May 30, 6:28 PM CDT, 22 minutes before

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Local storm report, May 30, 6:47 PM CDT, 3 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
May 30, 3:25 PM CDT	Special Weather Statement	HGX	Montgomery	65 min
May 30, 3:28 PM CDT	Special Weather Statement	HGX	Waller	47 min
May 30, 3:45 PM CDT	Special Weather Statement	HGX	Harris	45 min
May 30, 3:46 PM CDT	Areal Flood Advisory	HGX	Harris	59 min
May 30, 3:55 PM CDT	Severe Thunderstorm Warning	HGX	Liberty, Montgomery, San Jacinto	50 min
May 30, 4:13 PM CDT	Areal Flood Advisory	HGX	Harris, Liberty, Montgomery, San Jacinto	2 hr
May 30, 4:37 PM CDT	Flash Flood Warning	HGX	Harris, Montgomery	113 min
May 30, 4:40 PM CDT	Special Weather Statement	HGX	Liberty	50 min
May 30, 4:57 PM CDT	Special Weather Statement	HGX	Walker	48 min
May 30, 5:07 PM CDT	Special Weather Statement	HGX	Harris	38 min
May 30, 5:16 PM CDT	Areal Flood Advisory	HGX	Austin, Brazoria, Chambers, Fort Bend, Galveston, Harris and 1 more	119 min
May 30, 5:24 PM CDT	Special Marine Warning	HGX		36 min
May 30, 5:30 PM CDT	Flash Flood Warning	HGX	Fort Bend, Harris	2 hr
May 30, 5:46 PM CDT	Special Weather Statement	HGX	Polk	44 min
May 30, 5:55 PM CDT	Severe Thunderstorm Warning	HGX	Brazoria, Fort Bend, Harris	35 min
May 30, 6:10 PM CDT	Areal Flood Advisory	HGX	Austin, Colorado, Fort Bend, Grimes, Harris, Jackson and 4 more	110 min
May 30, 6:14 PM CDT	Special Weather Statement	HGX	Fort Bend	46 min
May 30, 6:25 PM CDT	Areal Flood Advisory	HGX	Brazoria, Fort Bend, Galveston, Harris	110 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.