Alert archive / Texas / Severe Thunderstorm Warnings in 2003

Severe Thunderstorm Warning 59, NWS Houston/Galveston, TX

April 22, 2003Waller County, Texas

NWS Houston/Galveston, TX issued this severe thunderstorm warning at Apr 22, 2003, 11:58 AM CDT for Waller County, Texas. It was in force for 32 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 22, 2003, 11:58 AM CDT (16:58 UTC)
Expired: Apr 22, 2003, 12:30 PM CDT
In force: 32 min
Issued by: NWS Houston/Galveston, TX
Area: Counties, with a storm outline in the text

County Waller County, TX

The radar

The Houston radar (KHGX), 121 km from the middle of the area, began a volume at 17:00 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 5.0 hours before the alert went out and 276 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: 1943 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: -8 m²/s²
0-3 km storm-relative helicity: 107 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

588 
WUUS54 KHGX 221658
SVRHOU
TXC473-221730-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
1157 AM CDT TUE APR 22 2003

THE NATIONAL WEATHER SERVICE IN LEAGUE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WALLER COUNTY IN SOUTHEAST TEXAS

* UNTIL 1230 PM CDT

* AT 1157 AM CDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 3   
MILES WEST OF HEMPSTEAD...MOVING EAST AT 40 MPH. LARGE HAIL IS 
LIKELY WITH THIS STORM.

* LOCATIONS IN THE PATH OF THE SEVERE THUNDERSTORM INCLUDE...
  HEMPSTEAD
  PRAIRIE VIEW...PINE ISLAND

MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR
BUSINESS. STAY AWAY FROM WINDOWS

PLEASE REPORT SEVERE WEATHER TO THE COUNTY SHERIFF...LOCAL POLICE...
OR DEPARTMENT OF PUBLIC SAFETY. THEY WILL RELAY YOUR REPORT TO THE
NATIONAL WEATHER SERVICE.

LAT...LON 3020 9616 3011 9616 3000 9609 3008 9596
          3023 9591

$$

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 22, 11:55 AM CDT, 3 minutes earlier.

Area forecast discussion, Apr 22, 11:55 AM CDT, 3 minutes before

SOUTHEAST TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
1155 AM CDT TUE APR 22 2003

HAVE UPDATED THE ZONES TO MENTION SEVERE THUNDERSTORM THREAT ACROSS
SOUTHEAST TEXAS FOR THIS AFTERNOON. ALSO UPDATED THE HAZARDOUS
WEATHER OUTLOOK. SO FAR...HAVE NOT RECEIVED ANY REPORTS OF SEVERE
WEATHER.

42/43/31/30

.HGX...NONE.

UPDATED PRELIMS...
CLL TT 079/064 076/065 081 525
IAH TT 079/065 077/067 080 525
GLS EE 077/069 077/069 076 324

--------------------------------------------------------------------
.PREVIOUS DISCUSSION (952 PM CDT)...
CURRENTLY WATCHING A LINE OF SHOWERS AND THUNDERSTORMS (MORE THAN
ANTICIPATED) MOVING INTO OUR NORTHWEST COUNTIES. FORECAST HAS HIGHER
POPS UP NORTH AND WILL GO AHEAD AND LEAVE THEM THERE. WILL ADJUST
THE POPS DOWN JUST A BIT FOR THE COASTAL COUNTIES AS IT APPEARS
GREATEST CONCENTRATION WILL REMAIN UP NORTH. 06Z GFS RUN HAD A MUCH
BETTER HANDLE ON THE CURRENT ACTIVITY THAN THE 06Z MESOETA. DO NOT
SEE ANY OBVIOUS SHORTWAVES ON WATER VAPOR BEHIND THE CURRENT ONE
MOVING THROUGH THE AREA...SO THINK THAT THE BULK OF OUR ACTION WILL
OCCUR THE REST OF THIS MORNING AND ON INTO THE EARLY TO MID
AFTERNOON HOURS. NO SIGNIFICANT CHANGES MADE TO THE UPDATED PRELIMS
BELOW. 42/43/31

Hazardous weather outlook, Apr 22, 11:45 AM CDT, 13 minutes before

GMZ330-335-TXZ163-164-176>179-195>200-210>214-226-227-235>238-231200-

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
1145 AM CDT TUE APR 22 2003

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST TEXAS.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED TO DEVELOP ACROSS
THE CENTRAL AND SOUTHERN PORTIONS OF SOUTHEAST TEXAS THIS AFTERNOON.
LARGE HAIL AND DAMAGING WINDS ARE POSSIBLE WITH THE STRONGER
THUNDERSTORMS THAT DO DEVELOP.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.

A STORM SYSTEM WILL MOVE ACROSS THE SOUTHERN AND CENTRAL PLAINS
WEDNESDAY AND THURSDAY AND IS EXPECTED TO PRODUCE SCATTERED SHOWERS
AND THUNDERSTORMS ACROSS THE AREA. THERE IS A SLIGHT RISK OF SEVERE
THUNDERSTORMS DURING THE WEDNESDAY NIGHT THROUGH THURSDAY AFTERNOON
TIME PERIOD.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE REQUIRED THIS AFTERNOON.

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 22, 10:54 AM CDT	Severe Thunderstorm Warning	HGX	Washington	51 min
Apr 22, 11:38 AM CDT	Severe Thunderstorm Warning	HGX	Austin	37 min
Apr 22, 12:25 PM CDT	Severe Thunderstorm Warning	HGX	Harris, Montgomery	35 min
Apr 22, 3:58 PM CDT	Severe Thunderstorm Warning	HGX	Polk, San Jacinto, Walker	47 min

Nearby

Severe Thunderstorm Warnings in Texas, 2003 Every severe thunderstorm warning in 2003

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.