Alert archive / Texas / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 13, NWS Corpus Christi, TX
NWS Corpus Christi, TX issued this severe thunderstorm warning at Apr 25, 1999, 8:59 AM CDT for La Salle County, Webb County, Texas. It was in force for 61 min. No storm report in the archive falls 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.
The facts
- Issued
- Apr 25, 1999, 8:59 AM CDT (13:59 UTC)
- Expired
- Apr 25, 1999, 10:00 AM CDT
- In force
- 61 min
- Issued by
- NWS Corpus Christi, TX
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties La Salle County, TX, Webb County, TX
The radar
The Laughlin AFB radar (KDFX), 153 km from the middle of the area, began a volume at 14:00 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.
The nearest sounding before it
Corpus Christi, TX (KCRP), launched 12:00Z, 2.0 hours before the alert went out and 191 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
- 1211 J/kg
- Mixed-layer CIN
- -153 J/kg
- Mixed-layer LCL
- 517 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 63 m²/s²
- 0-3 km storm-relative helicity
- 187 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.1
The text
As transmitted, in the capitals the NWS used until 2016.
999 WUUS1 KCRP 251404 RRA SVRCRP TXC283-479-251500- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE CORPUS CHRISTI TX 859 AM CDT SUN APR 25 1999 THE NATIONAL WEATHER SERVICE IN CORPUS CHRISTI HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... LA SALLE COUNTY IN TEXAS THIS INCLUDES THE CITY OF COTULLA EXTREME NORTH CENTRAL WEBB COUNTY IN TEXAS * UNTIL 1000 AM CDT * AT 856 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 29 MILES SOUTH OF COTULLA...MOVING NORTHEAST AT 20 MPH. REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN CORPUS CHRISTI. LAT...LON 2807 9943 2807 9881 2864 9882 2863 9938
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 Corpus Christi, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 25, 2:55 AM CDT, 6 hours 4 minutes earlier.
Area forecast discussion, Apr 25, 2:55 AM CDT, 6 hours 4 minutes before
COASTAL BEND FORECAST DISCUSSION NATIONAL WEATHER SERVICE CORPUS CHRISTI TX 255 AM CDT SUN APR 25 1999 THE FNTL ZONE CONTINUES TO RETROGRADE NWWD AS A WARM FNT THROUGH THE HILL COUNTRY. THIS WL CONTINUE THROUGH THE DAY AS LOW PRESSURE DEVELOPS IN W TX. WE WL CONTINUE TO WEAKEN OUR CAP. THIS WL BE MOST EVIDENT OUT WEST WHERE THE CAP IS EXPECTED TO ERODE BY AFTN. SOME WK DIFL ALOFT...AN APPROACHING THETA-E RDG AXIS AND WK LOW LVL CONVERGENCE WL BE ENOUGH TO WARRANT SMALL POPS OUT WEST. DO NOT REALLY SEE THE NEED FOR POPS FOR THE EAST UNTIL TNT AND MON. THAT IS WHEN WE WL SEE MUCH BETTER LIFT...ESPECIALLY THE NRN SECTIONS. SPLITTING JETS WL ENHANCE THE DIV/DIFL ALOFT. ALSO THE LOW LVL MOIST CONVERGENCE WL BE INCREASING WITH TIME AS THE COLD FNT APPROACHES. IT LOOKS OUR BEST CHCS AT PCPN WL BE LATE TNT INTO THE FIRST PART OF MON. SOME STORMS MAY BE STRONG DUE TO A GOOD DRY PUNCH OF AIR. CLOUDS/PCPN CHCS WL BE ENDING RATHER QUICKLY FROM WEST TO EAST ON MON ACROSS MOST OF THE AREA. THE ERN SECTIONS WL LKLY TAKE UNTIL MON NIGHT TO CLEAR OUT AS THE FNT WL BEGIN STALLING AND WEAKENING AS IT REACHES THE COAST. THE WINDS WL BE WEAKENING ON MON GIVEN THE APPROACHING WK FNT. PRELIMS FOLLOW... CRP EE 083/074 081/063 086 123 VCT EE 083/072 080/061 084 134 LRD EB 088/075 091/062 091 222 NGP EE 082/074 080/068 084 123 MB(SYN)...80 JM(MESO)...75 .CRP...NONE.
Nearby
Severe Thunderstorm Warnings in Texas, 1999Every severe thunderstorm warning in 1999
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.