Alert archive / Texas / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 57, NWS Corpus Christi, TX

April 27, 2015Webb County, Texas

NWS Corpus Christi, TX issued this severe thunderstorm warning at Apr 27, 2015, 3:39 AM CDT for Webb County, Texas. It was in force for 36 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Apr 27, 2015, 3:39 AM CDT (08:39 UTC)
Expired
Apr 27, 2015, 4:15 AM CDT
In force
36 min
Issued by
NWS Corpus Christi, TX
Area
Storm-based polygon

County Webb County, TX

The radar

The Corpus Christi radar (KCRP), 179 km from the middle of the area, began a volume at 08:41 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 00:00Z, 8.7 hours before the alert went out and 196 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, Corpus Christi, TX at 00:00Z on 2015-04-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3577 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, Corpus Christi, TX at 00:00Z on 2015-04-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 43 square meters per square second.1939587897117Sfc1 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
3577 J/kg
Mixed-layer CIN
-61 J/kg
Mixed-layer LCL
627 m above ground
0-6 km bulk shear
58 kt
0-1 km storm-relative helicity
43 m²/s²
0-3 km storm-relative helicity
113 m²/s²
Significant tornado parameter
0.8
Supercell composite
3.5

Open this sounding in Storm Lab

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 27, 2:21 AM CDT, 1 hour 18 minutes earlier.

Area forecast discussion, Apr 27, 2:21 AM CDT, 1 hour 18 minutes before
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Hazardous weather outlook, Apr 26, 4:59 AM CDT, 22 hours 40 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CORPUS CHRISTI TX
459 AM CDT SUN APR 26 2015

TXZ229>234-239>247-271000-
LA SALLE-MCMULLEN-LIVE OAK-BEE-GOLIAD-VICTORIA-WEBB-DUVAL-
JIM WELLS-KLEBERG-NUECES-SAN PATRICIO-ARANSAS-REFUGIO-CALHOUN-
459 AM CDT SUN APR 26 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTH TEXAS.

.DAY ONE...TODAY AND TONIGHT

ISOLATED THUNDERSTORMS WILL BE POSSIBLE TODAY. TONIGHT...ISOLATED
TO SCATTERED THUNDERSTORMS WILL BE POSSIBLE...WITH ISOLATED STRONG
TO SEVERE STORMS POSSIBLE LATE TONIGHT OVER THE VICTORIA
CROSSROADS.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

ISOLATED TO SCATTERED THUNDERSTORMS ARE EXPECTED MONDAY. ISOLATED
STRONG TO SEVERE THUNDERSTORMS WITH DAMAGING WINDS OR HAIL WILL BE
POSSIBLE MONDAY. THE HIGHEST THREAT FOR SEVERE STORMS MONDAY WILL BE
OVER THE VICTORIA CROSSROADS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BECOME NEEDED LATE TONIGHT INTO MONDAY FOR
STORMS ACROSS THE VICTORIA CROSSROADS REGION.

GMZ230-235-250-255-270-275-271000-
BAYS AND WATERWAYS FROM BAFFIN BAY TO PORT ARANSAS-
BAYS AND WATERWAYS FROM PORT ARANSAS TO PORT O'CONNOR-
COASTAL WATERS FROM BAFFIN BAY TO PORT ARANSAS OUT 20 NM-
COASTAL WATERS FROM PORT ARANSAS TO MATAGORDA SHIP CHANNEL OUT
20 NM-WATERS FROM BAFFIN BAY TO PORT ARANSAS FROM 20 TO 60 NM-
WATERS FROM PORT ARANSAS TO MATAGORDA SHIP CHANNEL FROM 20 TO
60 NM-
459 AM CDT SUN APR 26 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTH TEXAS AND THE MIDDLE
TEXAS COASTAL WATERS.

.DAY ONE...TODAY AND TONIGHT

A MARINE DENSE FOG ADVISORY IS IN EFFECT FOR THE LOCAL AREA BAYS
AND NEARSHORE WATERS THROUGH 9 AM CDT.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

SMALL CRAFT ADVISORY CONDITIONS WILL BE POSSIBLE BEHIND A COLD
FRONT ON TUESDAY AND TUESDAY NIGHT.

LK/TMT

In the hours before

Special weather statement, Apr 27, 1:35 AM CDT, 2 hours 4 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CORPUS CHRISTI TX
135 AM CDT MON APR 27 2015

TXZ229-239-270700-
WEBB-LA SALLE-
135 AM CDT MON APR 27 2015

...AN OUTFLOW BOUNDARY OF STRONG WIND WILL AFFECT NORTHWESTERN WEBB
AND LA SALLE COUNTIES...

AT 131 AM CDT...AN OUTFLOW BOUNDARY PRECEDING A LINE OF STRONG
THUNDERSTORMS WAS ALONG A LINE EXTENDING FROM NEAR DEVINE TO DILLEY
TO 6 MILES NORTHEAST OF CATARINA TO NEAR CHUPADERA RANCH
AIRPORT...AND MOVING SOUTHEAST AT 40 MPH.

NORTHWEST WINDS IN EXCESS OF 40 MPH ARE POSSIBLE WITH THIS OUTFLOW
BOUNDARY. THUNDERSTORMS MAY IMPACT THE AREA AFTER THE INITIAL AREA
OF STRONG WINDS PUSH THROUGH.

LOCATIONS IMPACTED INCLUDE...
COTULLA...CHUPADERA RANCH AIRPORT...GARDENDALE...LOS ANGELES...LAS
TIENDAS...MILLET...MILLETT...LA ESPERANZA RANCH AIRPORT...
FOWLERTON...ARTESIA WELLS AND WOODWARD.

STORMS MAY DEVELOP AND INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL
RADIO AND TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR
ADDITIONAL INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL
WEATHER SERVICE.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 900 AM CDT FOR SOUTH TEXAS.

LAT...LON 2820 10007 2820 9940 2862 9940 2864 9936
      2865 9880 2843 9880 2840 9884 2814 9919
      2780 9979 2795 9994 2798 9993 2802 10001
      2815 10008 2816 10013
TIME...MOT...LOC 0631Z 311DEG 35KT 2911 9887 2869 9919 2842 9955 2816
10002

HART
Local storm report, Apr 27, 2:27 AM CDT, 1 hour 12 minutes before
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Special weather statement, Apr 27, 3:31 AM CDT, 8 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Apr 27, 1:35 AM CDTSpecial Weather StatementCRPLa Salle25 min
Apr 27, 2:02 AM CDTSevere Thunderstorm WarningCRPLa Salle, McMullen58 min
Apr 27, 2:10 AM CDTTornado WarningCRPLa Salle35 min
Apr 27, 3:31 AM CDTSpecial Weather StatementCRPWebb29 min
Apr 27, 4:17 AM CDTSpecial Weather StatementCRPZapata43 min
Apr 27, 4:53 AM CDTSevere Thunderstorm WarningCRPWebb22 min
Apr 27, 3:20 PM CDTSmall Craft AdvisoryCRP40 hr

Nearby

Severe Thunderstorm Warnings in Texas, 2015Every severe thunderstorm warning in 2015

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.