Alert archive / Texas / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 113, NWS Houston/Galveston, TX

August 6, 2001Harris County, Texas

NWS Houston/Galveston, TX issued this severe thunderstorm warning at Aug 6, 2001, 6:50 PM CDT for Harris County, Texas. It was in force for 40 min. 1 report came from inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties, with what was reported inside it.

The facts

Issued: Aug 6, 2001, 6:50 PM CDT (23:50 UTC)
Expired: Aug 6, 2001, 7:30 PM CDT
In force: 40 min
Issued by: NWS Houston/Galveston, TX
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Harris County, TX

The radar

The Houston radar (KHGX), 66 km from the middle of the area, began a volume at 23:52 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.

What was reported inside it

Time	Report	Where	Remark
Aug 6, 7:30 PM CDT	Thunderstorm Wind	Jersey Village, TX	Power lines down.

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 11.8 hours before the alert went out and 212 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: 1658 J/kg
Mixed-layer CIN: -24 J/kg
Mixed-layer LCL: 702 m above ground
0-6 km bulk shear: 4 kt
0-1 km storm-relative helicity: -4 m²/s²
0-3 km storm-relative helicity: 8 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.

952 
WUUS54 KHGX 062353
SVRHOU
TXC201-070030-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
650 PM CDT MON AUG 6 2001

THE NATIONAL WEATHER SERVICE HAS ISSUED A

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

* UNTIL 730 PM CDT

* AT 642 PM CDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 
BETWEEN HOOKS AIRPORT AND JERSEY VILLAGE...MOVING SOUTH AT 10 MPH.

* LOCATIONS IN THE PATH OF THE SEVERE THUNDERSTORM INCLUDE...  
  JERSEY VILLAGE
  ALDINE
  HUNTERS CREEK VILLAGE
  
WIND GUSTS UP TO 60 MPH AND LARGE HAIL ARE LIKELY WITH THIS SEVERE 
THUNDERSTORM.

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 3006 9517 3004 9535 3012 9550 3004 9563
          2984 9568 2979 9529

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 Aug 6, 2:15 PM CDT, 4 hours 35 minutes earlier.

Area forecast discussion, Aug 6, 2:15 PM CDT, 4 hours 35 minutes before

SOUTHEAST TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
215 PM CDT MON AUG 6 2001

SHRA/TSRA FINALLY DEVELOPING AS CONVECTIVE TEMPERATURE IS REACHED.
EXPECT DECENT COVERAGE THIS EVENING AND ISOLATED CONVECTION WILL
PERSIST OVER THE EASTERN 2/3RDS OF THE REGION OVERNIGHT. THINK
TUESDAY WILL BE SIMILAR TO TODAY AS HIGH PW AIR REMAINS RESIDENT
OVER THE REGION AND 50H SHEAR ZONE IS JUST TO THE WEST OF SE TX.
LACK OF A LOW LEVEL TRIGGER AND MODEST UPPER LEVEL DIVERGENCE IS A
BIT UNSETTLING. STILL OF THE OPINION THAT DAYTIME HEATING WILL BE
SUFFICIENT TO SPAWN MANILY AFTERNOON CONVECTION WEDNESDAY. A BIT OF
A BREAK THURSDAY/FRIDAY AS UPPER LEVEL HIGH BUILDS ACROSS SE TX...
PWS DROP AND GRADIENT TIGHTENS REDUCING POSSIBLE SEA BREEZE
ACTIVITY. HEIGHTS FALL AGAIN SATURDAY/SUNDAY AND MSTR LEVELS RETURN
TO AROUND 1.9 INCHES SO WILL BRING A CHANCE OF TSRA BACK INTO THE
FORECAST.

MARINE: WEAK GRADIENT EQUALS LIGHT WINDS TONIGHT INTO WEDNESDAY.
GRADIENT TIGHTENS ON THURSDAY BUT EXPECT CONDITIONS TO REMAIN BELOW
SCA CRITERIA.

.KHGX...NONE.

43/45/48

PRELIMS...
CLL BE 074/096 073/097 074 342
IAH TT 073/093 074/094 073 352
GLS TT 080/090 081/090 081 352

Nearby

Severe Thunderstorm Warnings in Texas, 2001 Every severe thunderstorm warning in 2001

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.