Alert archive / Texas / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 75, NWS Houston/Galveston, TX

May 25, 2001Waller County, Texas

NWS Houston/Galveston, TX issued this severe thunderstorm warning at May 25, 2001, 2:53 AM CDT for Waller County, Texas. It was in force for 52 min. No storm report in the archive falls 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.

The facts

Issued: May 25, 2001, 2:53 AM CDT (07:53 UTC)
Expired: May 25, 2001, 3:45 AM CDT
In force: 52 min
Issued by: NWS Houston/Galveston, TX
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Waller County, TX

The radar

The Houston radar (KHGX), 111 km from the middle of the area, began a volume at 07:56 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 00:00Z, 7.9 hours before the alert went out and 271 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: 2062 J/kg
Mixed-layer CIN: -44 J/kg
Mixed-layer LCL: 965 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 50 m²/s²
0-3 km storm-relative helicity: 99 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 2.4

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KHGX 250753
SVRHOU
TXC473-250845-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
253 AM CDT FRI MAY 25 2001

THE NATIONAL WEATHER SERVICE HAS ISSUED A

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

* UNTIL 345 AM CDT

* AT 248 AM CDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM OVER
  PINE ISLAND...MOVING SOUTHEAST AT 25 MPH.

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

MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR 
BUSINESS. STAY AWAY FROM WINDOWS THE PRIMARY THREAT FROM THIS STORM 
IS LARGE HAIL 3/4 INCH DIAMETER OR LARGER. DAMAGING WINDS ARE 
POSSIBLE.

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 3015 9606 2999 9615 2986 9587 3011 9595

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 May 25, 2:10 AM CDT, 43 minutes earlier.

Area forecast discussion, May 25, 2:10 AM CDT, 43 minutes before

SOUTHEAST TEXAS FORECAST DISCUSSION...CORRECTION
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
210 AM CDT FRI MAY 25 2001

CONVECTION CONTG OVR PARTS OF THE CWA AND PTS W ATTM. MARGINAL HAIL
THREAT FOR THE NEXT HOUR OR TWO...BUT THAT SHD HOPEFULLY BE IT. WILL
PLAN ON MOST OF CURR ACTIVITY BEING GONE BY SUNRISE. WILL ADJUST AS
NECESSARY.

FNT OVR NRN ZONES IS A LTL BEHIND SCHD WHEN COMPARED TO FCST MODELS
24 HRS AGO. BNDRY BECOMES HARD TO FIND BY THIS EVENING. INSTAB FCSTS
AND PW VALUES STILL SUFFICIENT FOR SOME REDEVELOPMENT TDA...
...ESPECIALLY IN THE SW. WILL COVER MOST OF THE CWA WITH 20 PCT
FIRST PERIOD...EXCEPT MAYBE 30 SW. STG VORT MAX PROGGED TO MOVE
RAPIDLY SSEWD INTO BRO CWA BY 12Z SAT...WITH ANOTHER WEAKER PIECE OF
ENERGY INDC BY THE MESOETA ACRS OUR AREA LATE TMRW NGT AND EARLY
SAT. WILL KEEP 20 POPS GOING DUE TO THIS FEATURE.

PW VALUES FCST TO DECR BY LATE SAT AND HGTS WILL HAVE INCREASED A
BIT WITH NRN MEX H5 HIGH BEGINNING TO BUILD IN. THERE WILL ALSO BE A
LACK OF A FOCUS ALOFT AND AT THE SFC FOR ANY ACTIVITY TO FORM. THIS
SHD SET THE STAGE FOR EVEN LOWER POPS SUN. AVN AND MESOETA SHOW A
FAIRLY VIGOROUS VORT MAX MVG ACRS NERN ZONES EARLY IN THE
DAY...WHICH CUD HELP ENHANCE ACTIVITY A BIT THERE. RDG BUILDS IN
FURTHER EARLY NEXT WEEK. WILL KEEP EFP AS IT IS NOW...DRY MON AND
BEYOND.

.HGX...NONE.

46/35/48

PRELIMS...
CLL EB 086/066 086/068 087 222
IAH EB 087/068 088/069 088 222
GLS EB 083/074 084/074 084 222 (322 SW)

END

The office that day

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

Issued	Product	Office	Counties	Lasted
May 25, 11:02 AM CDT	Tornado Warning	HGX	Matagorda	28 min
May 25, 4:25 PM CDT	Severe Thunderstorm Warning	HGX	Matagorda, Wharton	50 min
May 25, 5:55 PM CDT	Severe Thunderstorm Warning	HGX	Brazoria, Fort Bend	50 min

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.