Alert archive / Texas / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 94, NWS Houston/Galveston, TX

May 5, 2000Walker County, Texas

NWS Houston/Galveston, TX issued this severe thunderstorm warning at May 5, 2000, 6:47 PM CDT for Walker County, Texas. It was in force for 43 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: May 5, 2000, 6:47 PM CDT (23:47 UTC)
Expired: May 5, 2000, 7:30 PM CDT
In force: 43 min
Issued by: NWS Houston/Galveston, TX
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Walker County, TX

The radar

The Houston radar (KHGX), 163 km from the middle of the area, began a volume at 23:58 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
May 5, 6:55 PM CDT	Hail 1.75	Crabbs Prairie, 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, 11.8 hours before the alert went out and 242 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: 697 J/kg
Mixed-layer CIN: -119 J/kg
Mixed-layer LCL: 796 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 67 m²/s²
0-3 km storm-relative helicity: 170 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.

000 
WUUS54 KHGX 052346
SVRHOU
TXC471-060030-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
647 PM CDT FRI MAY 5 2000

THE NATIONAL WEATHER SERVICE IN HOUSTON/GALVESTON TX HAS ISSUED A

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

* UNTIL 730 PM CDT

* AT 645 PM CDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 8    
  MILES SOUTH OF MIDWAY...MOVING EAST SOUTHEAST AT 20 MPH.

* LOCATIONS IN THE PATH OF THE SEVERE THUNDERSTORM INCLUDE...
  CRABBS PRAIRIE
  HUNTSVILLE

HAIL TO 1 INCH IN DIAMETER AND WIND GUSTS IN EXCESS OF 55 MPH ARE 
LIKELY WITH THIS STORM.

MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR
BUSINESS.

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 3098 9556 3084 9584 3062 9544 3095 9545

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 5, 2:45 PM CDT, 4 hours 2 minutes earlier.

Area forecast discussion, May 5, 2:45 PM CDT, 4 hours 2 minutes before

SOUTHEAST TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
245 PM CDT FRI MAY 5 2000

WV SAT LOOP INDICATES UPPER LOW MOVING N-NW TODAY. MODEL SOLNS IN
GOOD AGREEMENT THAT THIS FEATURE WILL WEAKEN AND MOVE OFF TO THE NE
AS IT GETS PICKED UP BY THE WESTERLIES. HEIGHTS WILL RISE OVER THE
AREA THIS WEEKEND WHICH WILL ALLOW FOR WARMER TEMPS AND A DECREASING
CHC OF RAIN.

LOW-LEVEL MOISTURE IS IN ABUNDANCE THIS AFT WITH NEAR 70 DW PTS
ACROSS MOST OF FA. SOUTHWARD SINKING BOUNDARY FROM EARLIER N TX
CONVECTION GETTING CLOSE TO NW PORTIONS OF FA. EXPECT SCT TSTMS
ACROSS THE NW ZONES DURING THE NEXT FEW HOURS. WILL LIKELY ADJUST
POPS FOR FIRST PD BASED ON CONVECTIVE TRENDS ACROSS N/NW ZONES AT
ISSUANCE TIME. WILL KEEP MENTION OF SVR TSTMS FOR CENTRAL AND N
ZONES FOR THIS EVENING.

WILL MENTION SLIGHT CHC FOR AFT/EVE TSTMS SAT. ATMOS STILL
POTENTIALLY UNSTABLE...BUT NOT LIKELY TO HAVE A SIGNIFICANT TRIGGER
OTHER THAN HEATING. EXPECT CAP TO BE SUFFICIENT ON SUN AND MON TO
LEAVE POPS OUT OF FORECAST. WILL BRING SLIGHT CHC BACK ON
TUE/WED AS MID-LEVEL TROF MOVES ACROSS AND FRONT WASHES OUT ACROSS
AREA. TEMPS WILL BE CLOSE TO GUID NUMBERS.

LITTLE CHG IN SFC PRESSURE GRADIENT EXPECTED DURING THE PD AS HIGH
REMAINS TO OUR EAST AND LOW PRESSURE TROF IS PARKED IN TX
PANHANDLE/FAR WEST TEXAS. SE WINDS EXPECTED IN THE 15 TO 20 MPH
DURING THE AFT HOURS.

33/47

.KHGX...NONE.

PRELIMS...
CLL BB 071/088 071/089 072 321
IAH BB 071/088 071/088 072 321
GLS BB 074/082 075/082 075 221

The office that day

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

Issued	Product	Office	Counties	Lasted
May 4, 7:17 PM CDT	Severe Thunderstorm Warning	HGX	Walker	43 min
May 5, 5:28 PM CDT	Severe Thunderstorm Warning	HGX	Brazos, Madison	62 min
May 5, 6:27 PM CDT	Severe Thunderstorm Warning	HGX	Houston, Madison	48 min
May 5, 6:55 PM CDT	Severe Thunderstorm Warning	HGX	Grimes	35 min

Nearby

Severe Thunderstorm Warnings in Texas, 2000 Every severe thunderstorm warning in 2000

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.