Alert archive / Texas / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 95, NWS Houston/Galveston, TX
NWS Houston/Galveston, TX issued this severe thunderstorm warning at Jun 21, 2001, 3:36 PM CDT for Harris County, Texas. It was in force for 39 min. 2 reports 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
- Jun 21, 2001, 3:36 PM CDT (20:36 UTC)
- Expired
- Jun 21, 2001, 4:15 PM CDT
- In force
- 39 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), 34 km from the middle of the area, began a volume at 20:40 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 |
|---|---|---|---|
| Jun 21, 3:42 PM CDT | Thunderstorm Wind | Galena Park, TX | Power lines down. |
| Jun 21, 3:55 PM CDT | Hail 0.75 | Deer Park, TX |
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, 8.6 hours before the alert went out and 192 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.
- Mixed-layer CAPE
- 1751 J/kg
- Mixed-layer CIN
- -13 J/kg
- Mixed-layer LCL
- 849 m above ground
- 0-6 km bulk shear
- 3 kt
- 0-1 km storm-relative helicity
- -30 m²/s²
- 0-3 km storm-relative helicity
- -4 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS54 KHGX 212036 SVRHOU TXC201-212115- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX 336 PM CDT THU JUN 21 2001 THE NATIONAL WEATHER SERVICE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... HARRIS COUNTY IN SOUTHEAST TEXAS * UNTIL 415 PM CDT * AT 330 PM CDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 3 MILES SOUTHWEST OF CHANNELVIEW...MOVING EAST AT 20 MPH. * LOCATIONS IN THE PATH OF THE SEVERE THUNDERSTORM INCLUDE... CHANNELVIEW...DEER PARK...CLOVERLEAF...GALENA PARK HIGHLANDS...BAYTOWN MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. STAY AWAY FROM WINDOWS. THE PRIMARY THREAT FROM THIS STORM APPEARS TO BE LARGE HAIL. 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 2983 9527 2965 9525 2968 9498 2988 9500
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 21, 2:35 PM CDT, 1 hour 1 minute earlier.
Area forecast discussion, Jun 21, 2:35 PM CDT, 1 hour 1 minute before
SOUTHEAST TEXAS FORECAST DISCUSSION NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX 235 PM CDT THU JUN 21 2001 SCATTERED CONVECTION OVER CWFA THIS AFTERNOON. SURFACE PRESSURE GRADIENT QUITE FLAT. COLD FRONT EXACT POSITION HARD TO PINPOINT BUT LOWER THAN 70 DEWPOINTS EVIDENT NW OF DFW GRADUALLY FALLING TO THE 50S OVER THE PANHANDLE. 12Z RUN OF ETA CONTINUE TO SHOW STRONG UPPER LEVEL DIVERGENCE FIELD (INDUCED BY RIGHT ENTRANCE REGION) MOVING OVER CWFA OVERNIGHT TONIGHT BUT WEAKENING RAPIDLY TOWARDS MORNING AS JET CORE MOVES FARTHER TO THE NE. LOW LEVEL INFLOW FROM GULF RELATIVELY WEAK DURING THIS PERIOD. AVN SHOWS PW VALUES JUST AHEAD OF FRONTAL BOUNDARY NEAR 1.9 INCHES WHILE ETA IS LOWER NEAR 1.7 INCHES. CAPE QUITE HIGH NEAR 3000 J/KG. MESO-ETA INDICATE E-W AXIS OF NEAR 1 INCH PRECIP SWINGING SOUTHWARD BUT PRECIP FIELD (IN CONJUNCTION W/UPPER LEVEL DIV FIELD) BECOMING DIFFUSE/WEAKENING RAPIDLY AFTER 22/09Z. THIS MAKE SENSE IN LIGHT OF WEAK INFLOW FIELD AND MAIN UPPER LEVEL ENERGY MAINLY STAYING FAR NE OF CWFA. 700 MB TROUGH LINE SHOULD BE NEAR COAST LINE BY 22/12Z. PW VALUES PROGGED BY MESO-ETA TO DROP NEAR AN INCH N AND CENTRAL ZONES BY FRI AFTERNOON. FRONT EXPECTED TO WASH OUT FRIDAY NIGHT. THE WEEKEND LOOKS DRY. RETURN FLOW ON SUNDAY WILL GRADUALLY UP THE MOISTURE LEVELS ENOUGH FOR POSSIBLE SEA BREEZE CONVECTION COASTAL AND POSSIBLY CENTRAL ZONES ON MONDAY. MRF HINTS AT INCREASING DEPTH OF MOISTURE FIELD (S-SE FLOW) MID AND LATTER PART OF NEXT WEEK. MARINE PACKAGE BENIGN WITH NO FLAGS. .HGX...NONE. 37/46/48 PRELIMS... CLL BU 069/089 065/091 068 610 IAH BU 071/090 067/091 069 530 GLS EB 077/087 075/087 077 341
In the hours before
Special weather statement, Jun 21, 10:40 AM CDT, 4 hours 56 minutes before
TXZ163-164-176>179-195>200-210>213-226-227-235-212059- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX 1040 AM CDT THU JUN 21 2001 ...AREAS OF MODERATE TO HEAVY RAIN POSSIBLE INLAND TONIGHT... A COLD FRONT WILL MOVE SOUTH ACROSS SOUTHEAST TEXAS TONIGHT. AS IT APPROACHES THE AREA...IT WILL ENCOUNTER A MOIST AND UNSTABLE AIRMASS. THIS WILL SET THE STAGE FOR SHOWERS AND THUNDERSTORMS. BECAUSE STEERING CURRENTS IN THE ATMOSPHERE ARE LIGHT...THE THUNDERSTORMS WILL MOVE SLOWLY...AND SOME WILL PRODUCE HEAVY RAIN. THE FRONT WILL WEAKEN A BIT AS IT MOVES SOUTH. THEREFORE...IT APPEARS AT THIS TIME THAT THE HEAVIEST RAINS WILL FALL ALONG AND NORTH OF A LINE FROM LAKE LIVINGSTON TO COLUMBUS. 1 TO 3 INCHES OF RAIN IS POSSIBLE IN THIS AREA. THIS COULD PRODUCE HIGH STANDING WATER IN AREAS OF POOR DRAINAGE AND COULD BRING SOME SMALL STREAMS AND CREEKS TO NEAR BANKFULL. FURTHER SOUTH IN SPOTS SUCH AS LIBERTY...METRO HOUSTON AND WHARTON... AMOUNTS SHOULD BE IN THE 1/2 TO ONE AND A HALF INCH RANGE...WITH ISOLATED TOTALS TO 3 INCHES. THIS WILL NOT BE SUFFICIENT TO BRING THE HOUSTON AREA BAYOU SYSTEM TO FLOOD LEVELS...BUT COULD PRODUCE HIGH SgTANDING WATER ON LOW LYING STREETS AND FEEDER ROADS. LOOK FOR SKIES TO GRADUALLY CLEAR FROM THE NORTH BEHIND THE FRONT FRIDAY AND FRIDAY NIGHT. SLIGHTLY LOWER HUMIDITY LEVELS WILL ALSO FOLLOW THE FRONT AND WILL REMAIN THROUGH SATURDAY.
Special weather statement, Jun 21, 3:30 PM CDT, 6 minutes before
TXZ163-164-176>179-195>200-210>213-226-227-235-220900- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX 330 PM CDT THU JUN 21 2001 ...AREAS OF MODERATE TO HEAVY RAIN POSSIBLE INLAND TONIGHT... A COLD FRONT WILL MOVE SOUTH ACROSS SOUTHEAST TEXAS TONIGHT. AS IT APPROACHES THE AREA...IT WILL ENCOUNTER A MOIST AND UNSTABLE AIRMASS. THIS WILL SET THE STAGE FOR SHOWERS AND THUNDERSTORMS... WHICH ARE BEGINNING TO DEVELOP LATE THIS AFTERNOON OVER NORTH TEXAS. BECAUSE STEERING CURRENTS IN THE ATMOSPHERE ARE LIGHT...THE THUNDERSTORMS WILL MOVE SLOWLY...AND SOME WILL PRODUCE HEAVY RAIN. THE FRONT WILL WEAKEN A BIT AS IT MOVES SOUTH. THEREFORE...IT APPEARS AT THIS TIME THAT THE HEAVIEST RAINS WILL FALL ALONG AND NORTH OF A LINE FROM LAKE LIVINGSTON TO COLUMBUS. 1 TO 3 INCHES OF RAIN IS POSSIBLE IN THIS AREA. THIS COULD PRODUCE HIGH STANDING WATER IN AREAS OF POOR DRAINAGE AND COULD BRING SOME SMALL STREAMS AND CREEKS TO NEAR BANKFULL. ISOLATED SPOTS COULD ALSO EXPERIENCE HAIL IN THUNDERSTORMS. FURTHER SOUTH IN SPOTS SUCH AS LIBERTY...METRO HOUSTON AND WHARTON... AMOUNTS SHOULD BE IN THE 1/2 TO ONE AND A HALF INCH RANGE...WITH ISOLATED TOTALS TO 3 INCHES. THIS WILL NOT BE SUFFICIENT TO BRING THE HOUSTON AREA BAYOU SYSTEM TO FLOOD LEVELS...BUT COULD PRODUCE HIGH STANDING WATER ON LOW LYING STREETS AND FEEDER ROADS. LOOK FOR SKIES TO GRADUALLY CLEAR FROM THE NORTH BEHIND THE FRONT FRIDAY AND FRIDAY NIGHT. SLIGHTLY LOWER HUMIDITY LEVELS WILL ALSO FOLLOW THE FRONT AND WILL REMAIN THROUGH SATURDAY. END/46
The office that day
Everything else NWS Houston/Galveston, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 21, 2:37 PM CDT | Severe Thunderstorm Warning | HGX | Fort Bend | 38 min |
Nearby
Severe Thunderstorm Warnings in Texas, 2001Every 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.