Alert archive / Texas / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 21, NWS Corpus Christi, TX

April 11, 2017Webb County, Texas

NWS Corpus Christi, TX issued this severe thunderstorm warning at Apr 11, 2017, 8:29 PM CDT for Webb County, Texas. It was in force for 31 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Apr 11, 2017, 8:29 PM CDT (01:29 UTC)
Expired: Apr 11, 2017, 9:00 PM CDT
In force: 31 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), 198 km from the middle of the area, began a volume at 01:33 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, 1.5 hours before the alert went out and 213 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: 1773 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 617 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 33 m²/s²
0-3 km storm-relative helicity: 30 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.6

Open this sounding in Storm Lab

The text

As transmitted.

441 
WUUS54 KCRP 120129
SVRCRP
TXC479-120200-
/O.NEW.KCRP.SV.W.0021.170412T0129Z-170412T0200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Corpus Christi TX
829 PM CDT TUE APR 11 2017

The National Weather Service in Corpus Christi has issued a

* Severe Thunderstorm Warning for...
  South central Webb County in south central Texas...

* Until 900 PM CDT

* At 829 PM CDT, a severe thunderstorm was located 7 miles southeast
  of Rio Bravo, or 18 miles southeast of Laredo, moving south at 15
  mph.

  HAZARD...60 mph wind gusts and quarter size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees. 

* Locations impacted include...
  Rio Bravo and El Cenizo. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 2726 9948 2727 9949 2730 9949 2731 9950
      2730 9952 2731 9954 2734 9951 2735 9951
      2737 9950 2737 9921 2727 9923 2727 9933
      2732 9937 2726 9945 2727 9947
TIME...MOT...LOC 0129Z 020DEG 13KT 2730 9937 

HAIL...1.00IN
WIND...60MPH
 
$$

CB

1 follow-up statement

699 
WWUS54 KCRP 120151
SVSCRP

Severe Weather Statement
National Weather Service Corpus Christi TX
851 PM CDT TUE APR 11 2017

TXC479-120200-
/O.EXP.KCRP.SV.W.0021.000000T0000Z-170412T0200Z/
Webb TX-
851 PM CDT TUE APR 11 2017

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL WEBB COUNTY WILL
EXPIRE AT 900 PM CDT...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire.

LAT...LON 2726 9948 2727 9949 2730 9949 2731 9950
      2730 9952 2731 9954 2734 9951 2735 9951
      2737 9950 2737 9921 2727 9923 2727 9933
      2732 9937 2726 9945 2727 9947
TIME...MOT...LOC 0150Z 020DEG 13KT 2723 9940 

$$

CB

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 11, 7:29 PM CDT	Special Marine Warning	CRP		61 min
Apr 11, 7:37 PM CDT	Severe Thunderstorm Warning	CRP	Webb	53 min
Apr 11, 7:56 PM CDT	Special Weather Statement	CRP	Nueces	34 min
Apr 11, 8:23 PM CDT	Flash Flood Warning	CRP	Webb	82 min
Apr 11, 8:36 PM CDT	Special Marine Warning	CRP		54 min
Apr 11, 9:32 PM CDT	Small Craft Advisory	CRP		5 hr
Apr 11, 9:41 PM CDT	River Flood Warning	CRP	Webb	25 hr
Apr 12, 8:57 AM CDT	River Flood Watch	CRP	Calhoun, Refugio, Victoria	6 hr
Apr 12, 2:47 PM CDT	River Flood Warning	CRP	Calhoun, Refugio, Victoria	5 days

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.