Alert archive / Texas / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 43, NWS Corpus Christi, TX

May 21, 2017Webb County, Texas

NWS Corpus Christi, TX issued this severe thunderstorm warning at May 21, 2017, 7:30 PM CDT for Webb County, Texas. It was in force for 45 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: May 21, 2017, 7:30 PM CDT (00:30 UTC)
Expired: May 21, 2017, 8:15 PM CDT
In force: 45 min
Issued by: NWS Corpus Christi, TX
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Webb County, TX

The radar

The Corpus Christi radar (KCRP), 179 km from the middle of the area, began a volume at 00:34 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, 0.5 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-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: 2241 J/kg
Mixed-layer CIN: -43 J/kg
Mixed-layer LCL: 836 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 24 m²/s²
0-3 km storm-relative helicity: 76 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 3.2

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 May 21, 7:09 PM CDT, 21 minutes earlier.

Area forecast discussion, May 21, 7:09 PM CDT, 21 minutes before

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Hazardous weather outlook, May 21, 5:09 AM CDT, 14 hours 21 minutes before

Hazardous Weather Outlook
National Weather Service Corpus Christi TX
509 AM CDT Sun May 21 2017

GMZ230-235-250-255-270-275-TXZ229>234-239>247-221015-
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-La Salle-McMullen-Live Oak-Bee-Goliad-Victoria-Webb-Duval-
Jim Wells-Kleberg-Nueces-San Patricio-Aransas-Refugio-Calhoun-
509 AM CDT Sun May 21 2017

This hazardous weather outlook is for South Texas and the Middle
Texas Coastal Waters.

.DAY ONE...Today and Tonight

Scattered to numerous thunderstorms are expected today and
tonight across South Texas. There is a slight risk of severe
thunderstorms across the Rio Grande Plains and a marginal risk
across the remainder of South Texas. Damaging wind and large hail
will be the primary threat with tornadoes a lower threat.

Heavy rainfall with localized minor flooding will be possible
today and tonight, mainly across interior portions of South
Texas.

.DAYS TWO THROUGH SEVEN...Monday through Saturday

Scattered thunderstorms are expected Monday through Tuesday night.
Although a few strong storms are possible on Monday, producing hail
and gusty winds, the main concern will be locally heavy rainfall and
possible flooding. The main concern for flooding will be over the
Victoria Crossroads region and coastal counties, with flooding more
isolated farther west. Non severe thunderstorms are possible on
Tuesday and Tuesday evening.

Small Craft Advisory conditions are possible over the Gulf of Mexico
late Thursday night and Friday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed later today or tonight and
possibly again Monday.

TE/GW

In the hours before

Local storm report, May 21, 5:40 PM CDT, 1 hour 50 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CORPUS CHRISTI TX
540 PM CDT SUN MAY 21 2017

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

0501 PM     HAIL             9 ESE LAREDO            27.50N  99.35W
05/21/2017  M2.50 INCH       WEBB               TX   STORM CHASER

            HAIL 2.50 INCHES IN DIAMETER REPORTED BY
            SPOTTERNETWORK.ORG. EVENT OCCURRED AT 2201 UTC
            5/21/2017.

&&

EVENT NUMBER CRP1700092

87

Local storm report, May 21, 5:43 PM CDT, 1 hour 47 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CORPUS CHRISTI TX
543 PM CDT SUN MAY 21 2017

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

0505 PM     TSTM WND GST     4 SE LAREDO             27.50N  99.44W
05/21/2017  E70 MPH          WEBB               TX   STORM CHASER

            70 MPH WIND GUST REPORTED BY SPOTTERNETWORK.ORG. EVENT
            OCCURRED AT 2205 UTC 5/21/2017.

&&

EVENT NUMBER CRP1700093

87

Local storm report, May 21, 6:09 PM CDT, 1 hour 21 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CORPUS CHRISTI TX
609 PM CDT SUN MAY 21 2017

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

0535 PM     HAIL             5 WNW AGUILARES         27.48N  99.16W
05/21/2017  M2.75 INCH       WEBB               TX   STORM CHASER

            SPOTTERNETWORK.ORG REPORTED TENNIS TO BASEBALL SIZED
            HAIL AT 2235 UTC 5/21/2017

&&

EVENT NUMBER CRP1700094

87

Local storm report, May 21, 6:15 PM CDT, 1 hour 15 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CORPUS CHRISTI TX
615 PM CDT SUN MAY 21 2017

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

0507 PM     HAIL             LAREDO                  27.55N  99.48W
05/21/2017  M1.00 INCH       WEBB               TX   AMATEUR RADIO

            HAM OPERATOR REPORTED 1 INCH DIAMETER HAIL AT THE
            LAREDO INTERNATIONAL AIRPORT AT 2207 UTC 5/21/2017

&&

EVENT NUMBER CRP1700095

87

Special weather statement, May 21, 6:41 PM CDT, 49 minutes before

Special Weather Statement
National Weather Service Corpus Christi TX
641 PM CDT SUN MAY 21 2017

TXZ239-220030-
Webb-
641 PM CDT SUN MAY 21 2017

...A STRONG THUNDERSTORM WILL AFFECT CENTRAL WEBB COUNTY...

At 640 PM CDT, a strong thunderstorm was located near Columbia
Bridge, or 24 miles northwest of Laredo, moving east at 25 mph.

Winds in excess of 30 mph and half inch hail are possible with this
storm.

Locations impacted include...
Laredo, Rio Bravo, Laredo International Airport, Botines, Unitec
Industrial Park, Ranchos Penitas West, Columbia Bridge, United South
High School, Texas A&M International University, St Augustine High
School South Laredo, Doctors Hospital Of Laredo, Laredo Community
College, Laredo Country Club and Orvil.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

LAT...LON 2749 9948 2750 9953 2757 9951 2761 9954
      2760 9958 2761 9958 2764 9960 2764 9963
      2763 9964 2764 9967 2766 9967 2766 9971
      2772 9976 2774 9980 2777 9981 2776 9984
      2779 9985 2778 9939 2736 9937 2735 9951
TIME...MOT...LOC 2340Z 278DEG 21KT 2770 9984

TJC

Special weather statement, May 21, 7:08 PM CDT, 22 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
May 21, 7:08 PM CDT	Special Weather Statement	CRP	Webb	37 min
May 21, 8:19 PM CDT	Severe Thunderstorm Warning	CRP	Webb	30 min
May 21, 8:50 PM CDT	Areal Flood Warning	CRP	Webb	3 hr
May 21, 8:56 PM CDT	River Flood Warning	CRP	Webb	47 hr
May 22, 2:16 AM CDT	Special Weather Statement	CRP	Calhoun	44 min
May 22, 2:25 AM CDT	Special Marine Warning	CRP		35 min
May 22, 2:39 AM CDT	Special Weather Statement	CRP	McMullen	51 min
May 22, 3:08 AM CDT	Special Weather Statement	CRP	Victoria	52 min
May 22, 3:26 AM CDT	Special Marine Warning	CRP		49 min
May 22, 4:01 AM CDT	Special Weather Statement	CRP	Victoria	44 min
May 22, 4:13 AM CDT	Flash Flood Warning	CRP	Calhoun	3 hr
May 22, 4:30 AM CDT	Special Weather Statement	CRP	Calhoun	45 min
May 22, 5:03 AM CDT	Special Marine Warning	CRP		42 min
May 22, 5:17 AM CDT	Special Weather Statement	CRP	Calhoun	58 min
May 22, 6:45 AM CDT	Special Marine Warning	CRP		30 min
May 22, 7:34 AM CDT	Special Marine Warning	CRP		56 min

Nearby

Severe Thunderstorm Warnings in Texas, 2017 Every severe thunderstorm warning in 2017

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.