Alert archive / Texas / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 49, NWS Corpus Christi, TX

April 4, 2012Calhoun County, Texas

NWS Corpus Christi, TX issued this severe thunderstorm warning at Apr 4, 2012, 3:45 PM CDT for Calhoun County, Texas. It was in force for 30 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Apr 4, 2012, 3:45 PM CDT (20:45 UTC)
Expired: Apr 4, 2012, 4:15 PM CDT
In force: 30 min
Issued by: NWS Corpus Christi, TX
Area: Storm-based polygon

County Calhoun County, TX

The radar

The Corpus Christi radar (KCRP), 103 km from the middle of the area, began a volume at 20:46 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

Time	Report	Where	Remark
Apr 4, 3:50 PM CDT	HAIL 1	Seadrift, TX	REPORTED BY BAYSIDE EXPRESS GAS STATION

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 4, 12:55 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Corpus Christi, TX (KCRP), launched 12:00Z, 8.8 hours before the alert went out and 96 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: 3692 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 499 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: -42 m²/s²
0-3 km storm-relative helicity: 18 m²/s²
Significant tornado parameter: -0.5
Supercell composite: -3.1

Open this sounding in Storm Lab

The text

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

704 
WUUS54 KCRP 042045
SVRCRP
TXC057-042115-
/O.NEW.KCRP.SV.W.0049.120404T2045Z-120404T2115Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CORPUS CHRISTI TX
345 PM CDT WED APR 4 2012

THE NATIONAL WEATHER SERVICE IN CORPUS CHRISTI HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WESTERN CALHOUN COUNTY IN SOUTH CENTRAL TEXAS

* UNTIL 415 PM CDT

* AT 344 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  SEADRIFT...AND MOVING EAST AT 15 MPH.

* LOCATIONS IMPACTED INCLUDE...
  SEADRIFT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM CDT
WEDNESDAY EVENING FOR SOUTH TEXAS.

&&

LAT...LON 2827 9663 2829 9662 2831 9664 2829 9670
      2838 9671 2841 9676 2843 9676 2845 9678
      2843 9681 2847 9684 2849 9683 2856 9670
      2855 9669 2827 9660
TIME...MOT...LOC 2044Z 276DEG 11KT 2838 9675

$$


MB

1 follow-up statement

860 
WWUS54 KCRP 042056
SVSCRP

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CORPUS CHRISTI TX
356 PM CDT WED APR 4 2012

TXC057-042115-
/O.CON.KCRP.SV.W.0049.000000T0000Z-120404T2115Z/
CALHOUN-
356 PM CDT WED APR 4 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM CDT
FOR WESTERN CALHOUN COUNTY...

AT 350 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR SEADRIFT...MOVING EAST AT 15 MPH.

* LOCATIONS IMPACTED INCLUDE...
  RURAL CENTRAL CALHOUN COUNTY...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM CDT
WEDNESDAY EVENING FOR SOUTH TEXAS.

&&

LAT...LON 2827 9663 2829 9662 2831 9664 2829 9670
      2838 9671 2841 9676 2843 9676 2845 9678
      2843 9681 2847 9684 2849 9683 2856 9670
      2855 9669 2827 9660
TIME...MOT...LOC 2055Z 276DEG 11KT 2838 9671

$$


MB

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 4, 3:05 PM CDT	Severe Thunderstorm Warning	CRP	Calhoun, Refugio	40 min
Apr 4, 3:09 PM CDT	Special Marine Warning	CRP		51 min
Apr 4, 3:39 PM CDT	Severe Thunderstorm Warning	CRP	Calhoun	66 min
Apr 4, 3:54 PM CDT	Severe Thunderstorm Warning	CRP	Aransas, Refugio	36 min
Apr 4, 4:02 PM CDT	Special Marine Warning	CRP		44 min
Apr 4, 4:17 PM CDT	Areal Flood Advisory	CRP	Calhoun, Refugio	88 min

Nearby

Severe Thunderstorm Warnings in Texas, 2012 Every severe thunderstorm warning in 2012

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.