Alert archive / Texas / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 52, NWS Brownsville, TX

July 22, 2004Zapata County, Texas

NWS Brownsville, TX issued this severe thunderstorm warning at Jul 22, 2004, 8:17 PM CDT for Zapata County, Texas. It was in force for 28 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 22, 2004, 8:17 PM CDT (01:17 UTC)
Expired: Jul 22, 2004, 8:45 PM CDT
In force: 28 min
Issued by: NWS Brownsville, TX
Area: Counties, with a storm outline in the text

County Zapata County, TX

The radar

The Corpus Christi radar (KCRP), 185 km from the middle of the area, began a volume at 01:18 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Corpus Christi, TX (KCRP), launched 00:00Z, 1.3 hours before the alert went out and 198 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: 1489 J/kg
Mixed-layer CIN: -23 J/kg
Mixed-layer LCL: 1260 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: -18 m²/s²
0-3 km storm-relative helicity: 3 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.3

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KBRO 230117
SVRBRO
TXC505-230145-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BROWNSVILLE TX
815 PM CDT THU JUL 22 2004

THE NATIONAL WEATHER SERVICE IN BROWNSVILLE HAS EXTENDED THE

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN ZAPATA COUNTY IN DEEP SOUTH TEXAS

* UNTIL 845 PM CDT

* AT 815 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED 
  TO INDICATE A SEVERE THUNDERSTORM...NOW ABOUT 10 MILES NORTHEAST OF
  ZAPATA...MOVING NORTHEAST AT 15 MPH.

* THE SEVERE THUNDERSTORM WILL REMAIN OVER MAINLY RURAL AREAS OF...
  ZAPATA COUNTY.

DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THIS STORM.
WHILE NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A
TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A
STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

LAT...LON 2703 9933 2691 9917 2718 9902 2726 9920

$$

PHILO

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 Brownsville, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 22, 8:15 PM CDT, 2 minutes earlier.

Area forecast discussion, Jul 22, 8:15 PM CDT, 2 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BROWNSVILLE TX
815 PM CDT THU JUL 22 2004

.1ST PD...STRONG TSTM OVR ZAPATA AND NORTHERN JIM HOGG COUNTIES ATTM
WITH SVR ISSUED. THREE TO 4 INCH RAFL TOTALS OVR ZAPATA COUNTY AND
HEBRONVILLE. FLASH FLOOD WARNING OUT FOR ZAPATA. DEVELOPMENT
CONTINUES IN THE WRN VLY...AS UNSTABLE ATMS AND CONVERGING OUTFLOW
BOUNDARIES ASSIST IN THE LIFTING PROCESS.

UPDATED ZFPBRO TO REFLECT CURRENT CONVECTIVE TRENDS.
&&

.PREVIOUS DISCUSSION...VISIBLE SATELLITE IMAGERY SHOWS A MESOSCALE
CYCLONIC SWIRL MOVING NORTH INTO STARR AND HIDALGO COUNTIES. IN
ADDITION...SHOWERS AND THUNDERSTORMS HAVE DEVELOPED ALONG THE SEA
BREEZE FRONT IN KENEDY COUNTY. THESE FEATURES ARE SUPPORTED BY AN
UPPER LEVEL LOW PRESSURE SYSTEM CENTERED NEAR LAREDO TX THAT IS
MOVING SLOWLY WEST. THE CHANCE FOR SHOWER AND THUNDERSTORM ACTIVITY
WILL DECREASE TOMORROW AS THE UPPER LOW CONTINUES MOVING WEST AND
WEAKENS. DURING THE NEXT FEW DAYS...A HIGH PRESSURE RIDGE OVER THE
GULF OF MEXICO WILL BE THE DOMINANT WEATHER FEATURE FOR DEEP SOUTH
TEXAS. THE RIDGE WILL GENERALLY INDUCE LIGHT TO MODERATE INTENSITY
SOUTHEAST SURFACE WINDS OVER DEEP SOUTH TEXAS.
&&

.MARINE...THE UPPER LEVEL LOW PRESSURE AREA IS EXITING THE REGION TO
THE WEST THIS EVENING. REMAINING GULF MOISTURE MAY SPARK A FEW
MARITIME SHOWERS DURING THE NEXT COUPLE DAYS. HIGH PRESSURE WILL
DOMINATE MOST OF THE WEEKEND BEFORE ANOTHER WEAK LOW PRESSURE SYSTEM
MOVES ACROSS THE GULF EARLY NEXT WEEK. CURRENT SEAS 3 TO 4 FEET
OFFSHORE WILL MODERATE TO AROUND 2 FEET DURING THE NEXT 24 HOURS.
&&

.AVIATION...UPPER LEVEL LOW PRESSURE IS SPARKING THUNDERSTORMS
BETWEEN MFE AND LRD THIS EVENING. VFR CONDITIONS WILL REMAIN FOR THE
REGIONAL AIRPORTS TONIGHT INTO TOMORROW. WINDS WILL DECOUPLE AFTER
SUNSET AND ONCE AGAIN INCREASE TOMORROW MORNING.
&&

.BRO WATCHES/WARNINGS/ADVISORIES...SEVERE THUNDERSTORM AND FLASH
FLOOD WARNINGS IN ZAPATA COUNTY.
&&

SYNOPTIC/GRIDS...PHILO/CAFFREY
MARINE/AVIATION...STRAUB
MESO...VEGA

THIS PRODUCT IS ALSO AVAILABLE ON OUR INTERNET WEB PAGE AT:
HTTP://WWW.SRH.NOAA.GOV/BRO

Hazardous weather outlook, Jul 22, 5:30 PM CDT, 2 hours 47 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BROWNSVILLE TX
530 PM CDT THU JUL 22 2004

TXZ248>257-231100-
BROOKS-COASTAL CAMERON-COASTAL WILLACY-HIDALGO-INLAND CAMERON-
INLAND WILLACY-JIM HOGG-KENEDY-STARR-ZAPATA-
530 PM CDT THU JUL 22 2004

THIS HAZARDOUS WEATHER OUTLOOK IS FOR DEEP SOUTH TEXAS.

.DAY ONE...REMAINDER OF TONIGHT.

ISOLATED SHOWERS AND THUNDERSTORM ARE POSSIBLE OVER THE WESTERN
PORTIONS OF THE RIO GRANDE VALLEY...ENDING BY MIDNIGHT. SOME FLOODED
ROADWAYS MAY BE ENCOUNTERED IN NORTHERN ZAPATA AND JIM HOGG THROUGH
MIDNIGHT.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.

ISOLATED THUNDERSTORMS WILL BE POSSIBLE. HOT WEATHER WILL
CONTINUE...WITH AFTERNOON HEAT INDICES OF 105 AND ABOVE COMMON.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED.

In the hours before

Local storm report, Jul 22, 7:10 PM CDT, 1 hour 7 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BROWNSVILLE TX
710 PM CDT THU JUL 22 2004

..TIME...   ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE...   ....MAG....     ..COUNTY LOCATION...ST.. ...SOURCE....
            ..REMARKS..

0707 PM     HAIL             7 N SAN YGNACIO         27.13N 99.45W
07/22/2004  0.75 INCH        XXX                XX   LAW ENFORCEMENT

            ZAPATA COUNTY SHERIFF REPORTED DIME-SIZE HAIL ON HIGHWAY
            83 JUST SOUTH OF THE WEBB/ZAPATA COUNTY LINE.

&&

JP

The office that day

Everything else NWS Brownsville, TX issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 22, 7:42 PM CDT	Severe Thunderstorm Warning	BRO	Jim Hogg, Zapata	33 min
Jul 22, 7:58 PM CDT	Flash Flood Warning	BRO	Zapata	3 hr
Jul 22, 11:00 PM CDT	Flash Flood Warning	BRO	Zapata	3 hr

Nearby

Severe Thunderstorm Warnings in Texas, 2004 Every severe thunderstorm warning 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; radar from the NEXRAD Level II archive.