Alert archive / Texas / Severe Thunderstorm Warnings in 1994

Severe Thunderstorm Warning 18, NWS Houston/Galveston, TX

April 15, 1994Grimes County, Montgomery County, Texas

NWS Houston/Galveston, TX issued this severe thunderstorm warning at Apr 15, 1994, 2:39 PM CDT for Grimes County, Montgomery County, Texas. It was in force for 66 min.

The area

The counties it named.

The facts

Issued: Apr 15, 1994, 2:39 PM CDT (19:39 UTC)
Expired: Apr 15, 1994, 3:45 PM CDT
In force: 66 min
Issued by: NWS Houston/Galveston, TX
Area: Whole counties

Counties Grimes County, TX, Montgomery County, TX

The radar

The Houston radar (KHGX), 124 km from the middle of the area, began a volume at 19:41 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, 7.7 hours before the alert went out and 247 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: 1928 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 594 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 65 m²/s²
0-3 km storm-relative helicity: 152 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.3

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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 15, 9:37 AM CDT, 5 hours 2 minutes earlier.

Area forecast discussion, Apr 15, 9:37 AM CDT, 5 hours 2 minutes before

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In the hours before

Special weather statement, Apr 15, 1:39 PM CDT, 1 hour before

TXZ163-164-176>179-195>200-210>213-226-227-236-152040-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HOUSTON TX
139 PM CDT FRI APR 15 1994

...SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR MOST OF SOUTHEAST TEXAS
THROUGH 7 PM CDT...

A SEVERE THUNDERSTORM IS IN EFFECT UNTIL 7 PM CDT FOR THE FOLLOWING
COUNTIES... BURLESON... BRAZOS... MADISON... GRIMES... HOUSTON...
TRINITY... POLK... SAN JACINTO... WALKER... MONTGOMERY... WASHINGTON...
COLORADO... AUSTIN... WALLER... LIBERTY... FORT BEND... WHARTON AND
HARRIS.

WITH VERY UNSTABLE AIR AHEAD OF AN ADVANCING COLD FRONT IN CENTRAL
TEXAS... THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM
THROUGH 7 PM CDT.  THESE THUNDERSTORMS HAVE PRODUCED LARGE HAIL AND A
POSSIBLE TORNADO IN NACOGDOCHES COUNTY.  THESE STORMS HAVE THE
CAPABILITY TO PRODUCE LARGE HAIL... DAMAGING WINDS AND DANGEROUS
LIGHTNING.

PEOPLE IN THE WATCH AREA SHOULD MONITOR THERE LOCAL TELEVISION AND
RADIO STATIONS AND YOU NOAA WEATHER RADIO STATIONS FOR THE LATEST
WEATHER UPDATES AND WARNINGS.

IF YOU ARE OUTDOORS...MOVE TO A PLACE OF SHELTER IMMEDIATELY IF A
STORM APPROACHES.  MOTORISTS SHOULD REMAIN ALERT FOR REDUCED
VISIBILITIES DURING DOWNPOURS OF RAIN.  STREETS MAY FLOOD QUICKLY.

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 15, 3:29 PM CDT	Severe Thunderstorm Warning	HGX	Waller	61 min
Apr 15, 3:29 PM CDT	Severe Thunderstorm Warning	HGX	Austin	44 min
Apr 15, 3:50 PM CDT	Severe Thunderstorm Warning	HGX	Harris, Montgomery	55 min
Apr 15, 4:17 PM CDT	Tornado Warning	HGX	Harris, Montgomery	58 min
Apr 15, 5:14 PM CDT	Severe Thunderstorm Warning	HGX	Liberty	61 min

Nearby

Severe Thunderstorm Warnings in Texas, 1994 Every severe thunderstorm warning in 1994

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.