Alert archive / Texas / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 45, NWS Brownsville, TX

September 23, 1997Cameron County, Kenedy County, Willacy County, Texas

NWS Brownsville, TX issued this severe thunderstorm warning at Sep 23, 1997, 7:40 PM CDT for Cameron County, Kenedy County, Willacy County, Texas. It was in force for 2 hr. 2 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Sep 23, 1997, 7:40 PM CDT (00:40 UTC)
Expired
Sep 23, 1997, 9:45 PM CDT
In force
2 hr
Issued by
NWS Brownsville, TX
Area
Whole counties

Counties Cameron County, TX, Kenedy County, TX, Willacy County, TX

The radar

The Brownsville radar (KBRO), 69 km from the middle of the area, began a volume at 00:47 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
Sep 23, 9:15 PM CDTThunderstorm Wind 54Lyford, TXWind casued extensive tree damage.
Sep 23, 9:35 PM CDTThunderstorm Wind 54Sarita, 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

Brownsville Intl, TX (KBRO), launched 00:00Z, 0.7 hours before the alert went out and 71 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 00:00Z on 1997-09-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1486 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brownsville Intl, TX at 00:00Z on 1997-09-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 49 square meters per square second.1939Sfc1 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
1486 J/kg
Mixed-layer CIN
-92 J/kg
Mixed-layer LCL
1208 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
49 m²/s²
0-3 km storm-relative helicity
108 m²/s²
Significant tornado parameter
0.2
Supercell composite
3.2

Open this sounding in Storm Lab

The text

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

317 
WUUS1 KBRO 240041 RRA
SVRBRO
TXC061-261-489-240245-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM AND SPECIAL MARINE WARNING
NATIONAL WEATHER SERVICE BROWNSVILLE TX
740 PM CDT TUE SEP 23 1997
 
THE NATIONAL WEATHER SERVICE IN BROWNSVILLE HAS ISSUED A
SEVERE THUNDERSTORM AND SPECIAL MARINE WARNING
EFFECTIVE UNTIL  945 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...S...
 
IN SOUTH TEXAS
 
   ...CAMERON COUNTY...KENEDY COUNTY...WILLACY COUNTY
 
   AND THE ADJACENT COASTAL WATERS OF THE LOWER TEXAS COAST
   THE BAY WATERS OF THE LAGUNA MADRE
 
A LINE OF INTENSE THUNDERSTORMS FROM NORTHERN KENEDY COUNTY TO EASTERN
HIDALGO COUNTY OF DEEP SOUTH TEXAS. THIS LINE IS MOVING SOUTHEAST AT 15
MPH. GUSTY WINDS...FREQUENT LIGHTNING...HAIL AND HEAVY RAINS COULD BE
ASSOCIATED WITH THESE THUNDERSTORMS.
 
WHEN THUNDERSTORMS ARE OCCURRING...PEOPLE SHOULD MOVE INSIDE A
STRONG BUILDING.  DO NOT STAND BY WINDOWS.  DONT USE TELEPHONES
OR ELECTRICAL APPLIANCES UNLESS IN AN EMERGENCY UNTIL THE STORM
HAS PASSED.  MOTORISTS SHOULD NOT DRIVE INTO LOW WATER CROSSINGS.
 
IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER FROM THE WEATHER IN A
STRONG BUILDING.  DAMAGING WIND...LARGE HAIL...VERY HEAVY RAIN...
AND DEADLY LIGHTNING ARE ALL POSSIBLE IN SEVERE THUNDERSTORMS.
STAY INSIDE AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.

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 Sep 23, 2:49 PM CDT, 4 hours 51 minutes earlier.

Area forecast discussion, Sep 23, 2:49 PM CDT, 4 hours 51 minutes before
DEEP SOUTH TEXAS FORECAST DISCUSSION...CORRECTION FOR TEXT
NATIONAL WEATHER SERVICE BROWNSVILLE TX
245 PM CDT TUE SEP 23 1997

CURRENT KBRO REFLECTIVITY SHOWS WIDELY SCT CELLS PERSISTING OVER
THE COASTAL BEND AND EXTENDING SOUTHWARDS INTO BROOKS AND KENEDY
COUNTIES.  THESE CELLS ARE MOVING EASTERLY AT 5 TO 10 MPH AND WILL
LIKELY DISSIPATE WITH THE SETTING SUN AND LOSS OF DAYTIME HEATING.
ALTHOUGH THE CURRENT SOUNDING REMAINS VERY MOIST AND UNSTABLE
AROUND THE REGION...SIGNIFICANT FORCING MECHANISMS ARE PRESENT WITH
THE SURFACE FRONTAL BOUNDARY JUST TO OUR NORTH AND SEVERAL 5H VORT
MAXES MOVING OVER THE REGION.  THE VORTS PERSIST THROUGH EARLY WED
WITH THE FRONTAL BOUNDARY PUSHING THROUGH DEEP SOUTH TX LATE
WED/EARLY THUR.  WILL GO BELOW MOS POP GUIDANCE AND FAN GUIDANCE AS
FEEL THAT THIS MAY BE A BIT OVERDONE.

SO FOR TXZ248>255...

.TONIGHT...PARTLY CLOUDY WITH A LESS THAN 20% CHC OF EARLY EVENING
RW/TRW. SOUTHEAST WIND 5 TO 10 MPH.

.WED...PARTLY CLOUDY WITH A 30 % CHC OF RW/TRW.  SOUTH TO SOUTHEAST
WIND 10 TO 15 MPH.

.WED NIGHT AND THUR...PARTLY CLOUDY WITH A 30% CHC OF RW/TRW.

IN THE 3 TO 5 DAY RANGE (FRI-SUN)...THE 5H CLOSED LOW GRADUALLY
SHIFTS NORTHEAST AND ALLOWS SURFACE RIDGING AND DRIER CONDITIONS TO
PREVAIL OVER THE FORECAST AREA.  ACCORDINGLY...WOULD LIKE TO
MAINTAIN WORDING OF "PARTLY CLOUDY" FOR ALL THREE DAYS.  TEMPS
SHOULD SLOWLY WARM AS CURRENT AIRMASS MODERATES AND EAST TO
SOUTHEAST SURFACE FLOW RETURNS.  SO WOULD LIKE TO WORD TEMPS
AS..."LOWS IN THE 60S INLAND...70S COAST.  HIGHS IN THE 80S NEAR
THE COAST TO THE 90S INLAND WEST."  THE ONLY POSSIBLE FLY IN THE
OINTMENT IS THE POTENTIAL MOISTURE ADVECTION FROM "NORA" OFF OF
BAJA CAL. MODEL GUIDANCE AND PMDEPD KEEPS MOISTURE ADVECTION
LIMITED TO SOUTHWESTERN STATES.  SO FOR NOW A DRY FORECAST LOOKS ON
TRACK.

IN THE CWF...SURFACE FRONTAL BOUNDARY WILL CONTINUE TO PUSH
OFFSHORE ON THURSDAY BRINGING ABOUT A WIND SHIFT.  SO FOR
WORDING...WOULD LIKE "TONIGHT...SOUTHEAST WND 15 KT.  SEAS 5 FT.
ISOLD RW/TRW. SMALL CRAFT SHOULD EXERCISE CAUTION. WED...SOUTHEAST
WND 15 KT. SEAS 5 FT. ISOLD RW/TRW. SMALL CRAFT SHOULD EXERCISE
CAUTION.  WED NIGHT...SOUTHEAST WND 15 KT...SHIFTING TO THE
NORTHWEST LATE. SEAS 5 FT. SMALL CRAFT SHOULD EXERCISE CAUTION."

BRO BB 077/093 074/089 070 05/30/30/30 `
MFE BB 077/095 074/091 068 10/30/30/30
RGC BB 077/097 073/092 068 10/30/30/30
SPI BB 079/089 077/087 073 10/30/30/30

60

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 23, 7:19 PM CDTSevere Thunderstorm WarningBROHidalgo56 min

Nearby

Severe Thunderstorm Warnings in Texas, 1997Every severe thunderstorm warning in 1997

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.