Alert archive / Texas / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 122, NWS Houston/Galveston, TX

June 28, 2015Grimes County, Montgomery County, Walker County, Texas

NWS Houston/Galveston, TX issued this severe thunderstorm warning at Jun 28, 2015, 4:27 PM CDT for Grimes County, Montgomery County, Walker County, Texas. It was in force for 31 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
Jun 28, 2015, 4:27 PM CDT (21:27 UTC)
Expired
Jun 28, 2015, 4:58 PM CDT
In force
31 min
Issued by
NWS Houston/Galveston, TX
Area
Storm-based polygon

Counties Grimes County, TX, Montgomery County, TX, Walker County, TX

The radar

The Houston radar (KHGX), 131 km from the middle of the area, began a volume at 21:28 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

Lake Charles Mun, LA (KLCH), launched 12:00Z, 9.5 hours before the alert went out and 243 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-pSkew-T log-p diagram, Lake Charles Mun, LA at 12:00Z on 2015-06-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1229 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lake Charles Mun, LA at 12:00Z on 2015-06-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -1 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
1229 J/kg
Mixed-layer CIN
-38 J/kg
Mixed-layer LCL
723 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
-1 m²/s²
0-3 km storm-relative helicity
12 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 Jun 28, 3:01 PM CDT, 1 hour 26 minutes earlier.

Area forecast discussion, Jun 28, 3:01 PM CDT, 1 hour 26 minutes before
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Hazardous weather outlook, Jun 28, 4:21 AM CDT, 12 hours 6 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
421 AM CDT SUN JUN 28 2015

TXZ163-164-176>179-195>200-210>214-226-227-235>238-291300-
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-
421 AM CDT SUN JUN 28 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST TEXAS.

.DAY ONE...TODAY AND TONIGHT

SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED TODAY INTO THIS
EVENING. THE MAIN HAZARD EXPECTED IS LOCALLY HEAVY RAINFALL.
HOWEVER...ISOLATED STRONG STORMS MAY GENERATE FREQUENT CLOUD-TO-
GROUND LIGHTNING AND STRONG GUSTY WINDS. OTHERWISE...PORTIONS OF
THE LOWER TRINITY RIVER IS EXPECTED TO REMAIN IN FLOOD.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

SCATTERED MAINLY DAYTIME SHOWERS AND THUNDERSTORMS ARE POSSIBLE
THROUGH WEDNESDAY. ISOLATED STRONG STORMS ARE POSSIBLE WITH THE
MAIN IMPACTS CLOUD-TO-GROUND LIGHTNING...LOCALLY HEAVY RAINFALL...
AND GUSTY WINDS. THE SHOWER AND THUNDERSTORM OVERAGE IS THEN
EXPECTED TO BECOME MORE ISOLATED THURSDAY THROUGH SATURDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE REQUIRED TODAY.

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 27, 8:54 PM CDTAreal Flood AdvisoryHGXHarris2 hr
Jun 27, 9:43 PM CDTFlash Flood WarningHGXHarris3 hr
Jun 27, 9:57 PM CDTAreal Flood AdvisoryHGXHarris, Montgomery, Waller2 hr
Jun 27, 10:10 PM CDTFlash Flood WarningHGXHarris, Montgomery, Waller2 hr
Jun 27, 11:34 PM CDTAreal Flood AdvisoryHGXHarris56 min
Jun 28, 12:12 AM CDTAreal Flood AdvisoryHGXFort Bend, Harris, Waller2 hr
Jun 28, 12:33 AM CDTFlash Flood WarningHGXFort Bend, Harris, Waller117 min
Jun 28, 12:48 AM CDTAreal Flood AdvisoryHGXPolk, San Jacinto117 min
Jun 28, 1:25 AM CDTAreal Flood AdvisoryHGXGrimes, Montgomery2 hr
Jun 28, 3:29 AM CDTAreal Flood AdvisoryHGXLiberty, San Jacinto2 hr
Jun 28, 3:31 AM CDTAreal Flood AdvisoryHGXBrazos, Grimes, Washington119 min
Jun 28, 4:59 AM CDTFlash Flood WarningHGXWaller, Washington91 min
Jun 28, 5:19 AM CDTAreal Flood AdvisoryHGXGrimes, Harris, Montgomery, Waller, Washington56 min
Jun 28, 5:27 AM CDTAreal Flood AdvisoryHGXHarris, Liberty, Montgomery, San Jacinto63 min
Jun 28, 5:43 AM CDTFlash Flood WarningHGXGrimes, Harris, Montgomery, Waller, Washington2 hr
Jun 28, 5:52 AM CDTFlash Flood WarningHGXLiberty, Montgomery, San Jacinto113 min
Jun 28, 6:30 AM CDTAreal Flood AdvisoryHGXHarris, Montgomery2 hr
Jun 28, 7:18 AM CDTAreal Flood AdvisoryHGXChambers, Harris, Liberty117 min
Jun 28, 7:40 AM CDTFlash Flood WarningHGXGrimes, Harris, Montgomery, Waller, Washington3 hr
Jun 28, 8:10 AM CDTSpecial Marine WarningHGX65 min
Jun 28, 8:32 AM CDTAreal Flood AdvisoryHGXHarris, Montgomery58 min
Jun 28, 8:39 AM CDTSpecial Marine WarningHGX96 min
Jun 28, 8:45 AM CDTAreal Flood AdvisoryHGXChambers, Harris, Liberty2 hr
Jun 28, 10:06 AM CDTSpecial Marine WarningHGX84 min
Jun 28, 2:25 PM CDTSpecial Marine WarningHGX65 min

Nearby

Severe Thunderstorm Warnings in Texas, 2015Every 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.