Alert archive / Texas / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 37, NWS Brownsville, TX

October 20, 2002Cameron County, Hidalgo County, Texas

NWS Brownsville, TX issued this severe thunderstorm warning at Oct 20, 2002, 4:17 PM CDT for Cameron County, Hidalgo County, Texas. It was in force for 103 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Oct 20, 2002, 4:17 PM CDT (21:17 UTC)
Expired
Oct 20, 2002, 6:00 PM CDT
In force
103 min
Issued by
NWS Brownsville, TX
Area
Counties, with a storm outline in the text

Counties Cameron County, TX, Hidalgo County, TX

The radar

The Brownsville radar (KBRO), 77 km from the middle of the area, began a volume at 21:21 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

TimeReportWhereRemark
Oct 20, 6:03 PM CDTHail 0.75Weslaco, TXA weather spotter reported 3/4 inch hail.

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.

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

Brownsville Intl, TX (KBRO), launched 12:00Z, 9.3 hours before the alert went out and 79 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-pSkew-T log-p diagram, Brownsville Intl, TX at 12:00Z on 2002-10-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1974 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brownsville Intl, TX at 12:00Z on 2002-10-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 34 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
1974 J/kg
Mixed-layer CIN
-8 J/kg
Mixed-layer LCL
724 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
34 m²/s²
0-3 km storm-relative helicity
86 m²/s²
Significant tornado parameter
0.4
Supercell composite
3.0

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KBRO 202117
SVRBRO
TXC061-215-202230-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BROWNSVILLE TX
415 PM CDT SUN OCT 20 2002

THE NATIONAL WEATHER SERVICE IN BROWNSVILLE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WESTERN CAMERON COUNTY IN DEEP SOUTH TEXAS
  SOUTHEASTERN HIDALGO COUNTY IN DEEP SOUTH TEXAS

* UNTIL 530 PM CDT

* AT 414 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM NEAR PROGRESO...OR NEAR MERCEDES...MOVING
  NORTHEAST AT 15 MPH. THIS SEVERE THUNDERSTORM WILL LIKELY PRODUCE
  HAIL TO THE SIZE OF NICKELS... AND WINDS IN EXCESS OF 60 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
   MERCEDES BY 425 PM CDT.
   LA FERIA BY 445 PM CDT.
   EDCOUCH BY 450 PM CDT.
   SANTA ROSA BY 500 PM CDT.

IF SEVERE WEATHER APPROACHES YOUR AREA...GO INSIDE A STURDY SHELTER
AWAY FROM WINDOWS. REMEMBER...SEVERE THUNDERSTORMS PRODUCE LARGE
DAMAGING HAIL...DAMAGING WINDS...FREQUENT CLOUD TO GROUND
LIGHTNING...AND VERY HEAVY RAIN.

IN ADDITION TO HAIL AND DAMAGING WINDS...FREQUENT CLOUD TO GROUND
LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS IMMEDIATELY.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

LAT...LON 2609 9809 2598 9794 2623 9765 2634 9796

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 Oct 20, 2:50 PM CDT, 1 hour 27 minutes earlier.

Area forecast discussion, Oct 20, 2:50 PM CDT, 1 hour 27 minutes before
DEEP SOUTH TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BROWNSVILLE TX
250 PM CDT SUN OCT 20 2002

.SHORT TERM...THE UPPER LEVEL LOW HAS CONTINUED ON ITS EASTWARD
PROGRESSION AND IS CURRENTLY OVER ARKANSAS.  AT THE SURFACE...A COLD
FRONT EXTENDS FROM AR THROUGH THE TX HILL COUNTRY...WHILE A SURFACE
TROUGH EXTENDS FROM LA THROUGH THE WEST GULF OF MEX WATERS AND BACK
ON SHORE NEAR BRO.  THIS BOUNDARY IS EXPECTED TO WEAKEN TODAY...
ALLOWING THE WINDS TO BECOME MORE UNIFORM AND SOUTHEASTERLY. THIS
WEAKENING BOUNDARY AS WELL AS THE RRQ OF THE UPPER LEVEL JET WILL
AID IN UVV TONIGHT. PLUS WITH PWATS APPROACHING 2 IN...ADEQUATE
MOISTURE APPEARS TO BE IN PLACE FOR SHOWER/THUNDERSTORM DEVELOPMENT.
AVN AND ETA BOTH HAVE PRECIP. TONIGHT FOR THE AREA...HOWEVER...BY
MONDAY THE ETA KEEPS MOST OF THE PRECIP TO THE NORTH. THE AVN HAS
STRONGER OVERRUNNING/ISENTROPIC LIFT TO THE NORTH AS WELL AS MORE
PRECIP. BELIEVE BEST CHANCE WILL BE IN THE MORNING AS GREATEST UVV
SHIFTS FROM DEPSOTX TO LA BY MON. NIGHT. MODELS TRENDING DRIER FOR
TUES...WILL ADJUST ZONES TO REFLECT THIS CHANGE.

.EXTENDED...AN UPPER LEVEL LOW WILL TRAVERSE THE SOUTHERN U.S. IN
THE WEST-SOUTHWESTERLY FLOW REACHING TEXAS BY FRIDAY. AT THE
SURFACE...ONSHORE FLOW WILL CONTINUE UNTIL LATE FRIDAY WHEN THE
ASSOCIATED COLD FRONT IS EXPECTED TO MAKE IT INTO SOUTH
TEXAS...WHETHER OR NOT IT WILL REACH DEPSOTX IS STILL IN QUESTION.
OTHERWISE...MOST OF THE WEEK SEEMS RELATIVELY DRY.

.MARINE DISCUSSION...THE POTENTIAL FOR ISOLATED SHOWERS AND
THUNDERSTORMS WILL CONTINUE OVER THE COASTAL WATERS THROUGH MID
WEEK...AS MOIST GULF AIR IS DESTABILIZED BY CONDITIONS ALOFT.  THE
AVN IS MORE AGGRESSIVE WITH RAINFALL AREAL COVERAGE AND AMOUNT.
WINDS WILL REMAIN LIGHT TO MODERATE FROM THE SOUTHEAST...WITH SEAS
MODERATE AS WELL.  NO FLAGS ARE EXPECTED IN THE SHORT TERM.  BY MID
WEEK A COLD FRONT PUSHES SOUTH INTO CENTRAL AND EAST TEXAS...AND THE
AVN THEN DEVELOPS DEEPENING SURFACE LOW PRESSURE IN EAST TEXAS LATE
IN THE WEEK.  IF THIS VERIFIES...WINDS WILL INCREASE OVER THE LOWER
TEXAS COASTAL WATERS TOWARD THE END OF THE WEEK...THOUGH SMALL CRAFT
ADVISORIES STILL APPEAR MARGINAL AT THIS POINT.

PRELIMINARY NUMBERS...
BRO EE 072/085 072/086 072 50/30/20/20/00
HRL EE 070/085 070/086 071 50/30/20/20/00
MFE EE 070/086 070/087 070 50/30/20/20/00
RGC EE 069/086 068/088 068 50/30/20/20/00
SPI EE 076/081 074/080 075 30/20/20/20/00

SYNOPTIC...63
AVIATION-MARINE-MESO...54

INTERNET ADDRESS...WWW.SRH.NOAA.GOV/BRO

.BRO...NONE.
Hazardous weather outlook, Oct 20, 6:15 AM CDT, 10 hours 2 minutes before
TXZ248>257-211100-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BROWNSVILLE TX
615 AM CDT SUN OCT 20 2002

THIS HAZARDOUS WEATHER OUTLOOK IS FOR DEEP SOUTH TEXAS.

.DAY ONE...

SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED TODAY AND TONIGHT.
THESE THUNDERSTORMS SHOULD REMAIN BELOW SEVERE CRITERIA...BUT MAY
PRODUCE ENOUGH RAINFALL TO PRODUCE FLOODING OF URBAN AREAS OR SMALL
STREAMS.

.SPOTTER CALL TO ACTION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY AND TONIGHT.

.DAYS TWO THROUGH SEVEN...

NO HAZARDOUS WEATHER IS EXPECTED.

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 19, 7:37 PM CDTSevere Thunderstorm WarningBROBrooks, Kenedy68 min
Oct 19, 8:16 PM CDTSevere Thunderstorm WarningBROBrooks21 hr
Oct 20, 4:29 PM CDTTornado WarningBROKenedy31 min
Oct 20, 4:32 PM CDTSpecial Marine WarningBRO58 min
Oct 20, 4:32 PM CDTSpecial Marine WarningBRO58 min
Oct 20, 5:02 PM CDTTornado WarningBROKenedy, Willacy28 min
Oct 20, 5:06 PM CDTSevere Thunderstorm WarningBROCameron, Hidalgo, Willacy84 min
Oct 20, 5:24 PM CDTSevere Thunderstorm WarningBROCameron, Hidalgo, Willacy81 min
Oct 20, 5:29 PM CDTTornado WarningBROHidalgo31 min
Oct 20, 5:41 PM CDTSpecial Marine WarningBRO2 hr
Oct 20, 5:51 PM CDTSevere Thunderstorm WarningBROCameron, Willacy69 min
Oct 20, 6:17 PM CDTSevere Thunderstorm WarningBROCameron, Hidalgo, Kenedy, Willacy88 min
Oct 20, 6:38 PM CDTTornado WarningBROCameron37 min
Oct 20, 6:58 PM CDTSevere Thunderstorm WarningBROCameron47 min

Nearby

Severe Thunderstorm Warnings in Texas, 2002Every severe thunderstorm warning in 2002

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.