Alert archive / Texas / Severe Thunderstorm Watches in 2004
Severe Thunderstorm Watch 849
The Storm Prediction Center issued this severe thunderstorm watch at Sep 30, 2004, 12:55 PM MDT for 8 counties in New Mexico; 27 counties in Texas. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 30, 2004, 12:55 PM MDT (18:55 UTC)
- Expired
- Sep 30, 2004, 7:00 PM MDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
All 35 counties
Chaves County, NM, Curry County, NM, De Baca County, NM, Eddy County, NM, Guadalupe County, NM, Lea County, NM, Quay County, NM, Roosevelt County, NM, Andrews County, TX, Armstrong County, TX, Bailey County, TX, Borden County, TX, Carson County, TX, Castro County, TX, Cochran County, TX, Crosby County, TX, Dawson County, TX, Deaf Smith County, TX, Floyd County, TX, Gaines County, TX, Garza County, TX, Hale County, TX, Hockley County, TX, Howard County, TX, Lamb County, TX, Lubbock County, TX, Lynn County, TX, Martin County, TX, Oldham County, TX, Parmer County, TX, Potter County, TX, Randall County, TX, Swisher County, TX, Terry County, TX, Yoakum County, TX
Warnings issued inside it
11 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 30, 2:58 PM MDT | Severe Thunderstorm Warning | MAF | Eddy | 62 min |
| Sep 30, 5:00 PM MDT | Flash Flood Warning | MAF | Eddy | 6 hr |
| Sep 30, 5:04 PM MDT | Severe Thunderstorm Warning | LUB | Garza | 41 min |
| Sep 30, 5:35 PM MDT | Severe Thunderstorm Warning | LUB | Terry | 40 min |
| Sep 30, 5:45 PM MDT | Severe Thunderstorm Warning | LUB | Garza | 45 min |
| Sep 30, 6:07 PM MDT | Flash Flood Warning | LUB | Terry | 113 min |
| Sep 30, 6:56 PM MDT | Severe Thunderstorm Warning | LUB | Garza | 64 min |
| Sep 30, 6:56 PM MDT | Severe Thunderstorm Warning | MAF | Andrews | 64 min |
| Sep 30, 6:57 PM MDT | Flash Flood Warning | LUB | Garza | 2 hr |
| Sep 30, 7:00 PM MDT | Flash Flood Warning | LUB | Lynn | 2 hr |
| Sep 30, 7:00 PM MDT | Severe Thunderstorm Warning | LUB | Lynn | 60 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Amarillo Airport, TX (KAMA), launched 12:00Z, 6.9 hours before the alert went out and 187 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
- 19 J/kg
- Mixed-layer CIN
- -110 J/kg
- Mixed-layer LCL
- 1054 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 79 m²/s²
- 0-3 km storm-relative helicity
- 85 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
WWUS20 KWNS 301856
SEL9
SPC WW 301855
NMZ000-TXZ000-010100-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 849
NWS STORM PREDICTION CENTER NORMAN OK
155 PM CDT THU SEP 30 2004
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
EASTERN NEW MEXICO
WEST TEXAS
EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 155 PM UNTIL
800 PM CDT.
HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 120 STATUTE MILES
NORTH AND SOUTH OF A LINE FROM 40 MILES NORTH NORTHWEST OF ROSWELL
NEW MEXICO TO 30 MILES EAST SOUTHEAST OF PLAINVIEW TEXAS.
REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA.
PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING
WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
TORNADOES.
DISCUSSION...SCATTERED THUNDERSTORMS ARE EXPECTED TO INTENSIFY OVER
EASTERN NM THIS AFTERNOON AND SPREAD EASTWARD INTO WEST TX. COLD
TEMPERATURES ALOFT AND STEEP LAPSE RATES...MLCAPE VALUES OVER 1000
J/KG...AND SUFFICIENT DEEP LAYER VERTICAL SHEAR WILL POSE A RISK OF
SUPERCELLS CAPABLE OF LARGE HAIL.
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 26030.
...HART
353,1044 354,1011 321,1011 320,1044SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 30, 12:23 PM MDT | Mesoscale Discussion | SPC | Chaves, Curry, Eddy, Lea, Quay, Roosevelt | 2 hr |
| Sep 30, 3:52 PM MDT | Mesoscale Discussion | SPC | Childress, Collingsworth, Cottle, Dickens, Donley, Fisher and 18 more | 83 min |
| Sep 30, 4:56 PM MDT | Mesoscale Discussion | SPC | Jeff Davis, Loving, Pecos, Reeves, Ward, Winkler | 94 min |
Nearby
Severe Thunderstorm Watches in Texas, 2004Severe Thunderstorm Watches in New Mexico, 2004Every severe thunderstorm watch in 2004
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.