Alert archive / Texas / Special Weather Statements in 2013

Special Weather Statement, NWS Houston/Galveston, TX

April 27, 2013Waller County, Texas

NWS Houston/Galveston, TX issued this special weather statement at Apr 27, 2013, 2:21 PM CDT for Waller County, Texas. It was in force for 39 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Apr 27, 2013, 2:21 PM CDT (19:21 UTC)
Expired: Apr 27, 2013, 3:00 PM CDT
In force: 39 min
Issued by: NWS Houston/Galveston, TX

County Waller County, TX

The radar

The Houston radar (KHGX), 80 km from the middle of the area, began a volume at 19:23 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, 7.4 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-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: 548 J/kg
Mixed-layer CIN: -297 J/kg
Mixed-layer LCL: 597 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 49 m²/s²
0-3 km storm-relative helicity: 135 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Apr 27, 12:27 PM CDT, 1 hour 54 minutes earlier.

Area forecast discussion, Apr 27, 12:27 PM CDT, 1 hour 54 minutes before

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Hazardous weather outlook, Apr 27, 6:03 AM CDT, 8 hours 18 minutes before

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In the hours before

Special weather statement, Apr 27, 2:21 PM CDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
221 PM CDT SAT APR 27 2013

TXZ212-213-227-272000-
FORT BEND TX-HARRIS TX-WALLER TX-
221 PM CDT SAT APR 27 2013

...SPECIAL WEATHER STATEMENT...

AT 214 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
A STRENGTHENING THUNDERSTORM NEAR KATY...MOVING NORTHEAST AT 15 MPH.

WIND GUSTS UP TO 30 MPH WILL BE POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
KATY...JERSEY VILLAGE...TOMBALL...BROOKSHIRE AND PATTISON.

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.

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.

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
OFFICE IN LEAGUE CITY .

&&

LAT...LON 3013 9558 2981 9544 2976 9597 2981 9601
TIME...MOT...LOC 1914Z 243DEG 14KT 2986 9580

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 27, 2:08 PM CDT	Areal Flood Advisory	HGX	Austin, Harris, Waller	52 min
Apr 27, 3:08 PM CDT	Areal Flood Advisory	HGX	Harris	112 min
Apr 27, 3:35 PM CDT	Special Weather Statement	HGX	Harris	40 min
Apr 27, 4:10 PM CDT	Severe Thunderstorm Warning	HGX	Brazoria, Harris	35 min
Apr 27, 4:24 PM CDT	Areal Flood Advisory	HGX	Fort Bend, Harris	2 hr
Apr 27, 4:47 PM CDT	Severe Thunderstorm Warning	HGX	Brazoria, Fort Bend, Harris	28 min
Apr 27, 5:06 PM CDT	Flash Flood Warning	HGX	Fort Bend, Harris	114 min
Apr 27, 5:17 PM CDT	Severe Thunderstorm Warning	HGX	Brazoria, Harris	28 min
Apr 27, 5:20 PM CDT	Severe Thunderstorm Warning	HGX	Houston	55 min
Apr 27, 5:40 PM CDT	Special Weather Statement	HGX	Montgomery	50 min
Apr 27, 5:42 PM CDT	River Flood Warning	HGX	Harris	38 hr
Apr 27, 5:47 PM CDT	Severe Thunderstorm Warning	HGX	Harris, Montgomery	58 min
Apr 27, 5:48 PM CDT	Severe Thunderstorm Warning	HGX	Chambers, Harris	27 min
Apr 27, 5:50 PM CDT	Special Marine Warning	HGX		40 min
Apr 27, 6:42 PM CDT	Special Weather Statement	HGX	Colorado	33 min
Apr 27, 6:51 PM CDT	Flash Flood Warning	HGX	Brazoria, Fort Bend, Harris, Waller	3 hr

Nearby

Special Weather Statements in Texas, 2013 Every special weather statement 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.