Alert archive / Texas / Special Weather Statements in 2015

Special Weather Statement, NWS Austin/San Antonio, TX

April 18, 2015Dimmit County, Texas

NWS Austin/San Antonio, TX issued this special weather statement at Apr 18, 2015, 10:50 AM CDT for Dimmit County, Texas. It was in force for 25 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 18, 2015, 10:50 AM CDT (15:50 UTC)
Expired: Apr 18, 2015, 11:15 AM CDT
In force: 25 min
Issued by: NWS Austin/San Antonio, TX

County Dimmit County, TX

The radar

The Laughlin AFB radar (KDFX), 107 km from the middle of the area, began a volume at 15:52 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

Del Rio, TX (KDLF), launched 12:00Z, 3.8 hours before the alert went out and 141 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: 668 J/kg
Mixed-layer CIN: -134 J/kg
Mixed-layer LCL: 705 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: -48 m²/s²
0-3 km storm-relative helicity: 81 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.4

Open this sounding in Storm Lab

The text

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

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What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Austin/San Antonio, TX wrote its last area forecast discussion before this special weather statement went out at Apr 18, 6:11 AM CDT, 4 hours 39 minutes earlier.

Area forecast discussion, Apr 18, 6:11 AM CDT, 4 hours 39 minutes before

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Hazardous weather outlook, Apr 18, 4:26 AM CDT, 6 hours 24 minutes before

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In the hours before

Special weather statement, Apr 18, 6:06 AM CDT, 4 hours 44 minutes before

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Special weather statement, Apr 18, 9:18 AM CDT, 1 hour 32 minutes before

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Special weather statement, Apr 18, 10:50 AM CDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1050 AM CDT SAT APR 18 2015

TXZ228-181615-
DIMMIT TX-
1050 AM CDT SAT APR 18 2015

...SPECIAL WEATHER STATEMENT FOR SOUTHWESTERN DIMMIT COUNTY UNTIL
1115 AM CDT...

AT 1049 AM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 11
MILES NORTH OF CHUPADERA RANCH AIRPORT...OR 15 MILES SOUTHWEST OF
CARRIZO SPRINGS...MOVING EAST AT 20 MPH.

NICKEL SIZE HAIL AND WIND GUSTS UP TO 50 MPH WILL BE POSSIBLE WITH
THIS STORM.

LOCATIONS IMPACTED INCLUDE...
CARRIZO HILL.

LAT...LON 2827 10007 2835 10011 2839 10010 2851 9983
      2829 9974
TIME...MOT...LOC 1549Z 252DEG 19KT 2835 10001

JA

The office that day

Everything else NWS Austin/San Antonio, TX issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 17, 7:00 PM CDT	River Flood Warning	EWX	Kerr	20 hr
Apr 17, 7:13 PM CDT	Special Weather Statement	EWX	DeWitt	47 min
Apr 17, 8:02 PM CDT	Areal Flood Advisory	EWX	Travis, Williamson	3 hr
Apr 17, 8:34 PM CDT	Special Weather Statement	EWX	Lavaca	26 min
Apr 17, 8:38 PM CDT	Special Weather Statement	EWX	DeWitt	37 min
Apr 17, 10:29 PM CDT	Special Weather Statement	EWX	Dimmit	46 min
Apr 18, 6:06 AM CDT	Special Weather Statement	EWX	Val Verde	39 min
Apr 18, 9:18 AM CDT	Special Weather Statement	EWX	Maverick	42 min
Apr 18, 10:53 AM CDT	Special Weather Statement	EWX	Dimmit	52 min
Apr 18, 4:14 PM CDT	Severe Thunderstorm Warning	EWX	Bandera, Kendall, Kerr	33 min
Apr 18, 4:15 PM CDT	Special Weather Statement	EWX	Val Verde	30 min
Apr 18, 4:40 PM CDT	Areal Flood Advisory	EWX	Bandera, Kendall, Kerr	2 hr
Apr 18, 4:50 PM CDT	Special Weather Statement	EWX	Kendall	40 min
Apr 18, 4:58 PM CDT	Severe Thunderstorm Warning	EWX	Kendall	47 min
Apr 18, 5:21 PM CDT	Areal Flood Advisory	EWX	Kendall	114 min
Apr 18, 5:37 PM CDT	Severe Thunderstorm Warning	EWX	Blanco, Gillespie, Kendall, Kerr	38 min
Apr 18, 6:10 PM CDT	Severe Thunderstorm Warning	EWX	Blanco, Gillespie, Llano	50 min
Apr 18, 6:29 PM CDT	Special Weather Statement	EWX	Kendall	46 min
Apr 18, 6:30 PM CDT	Severe Thunderstorm Warning	EWX	Gillespie, Llano	30 min
Apr 18, 6:45 PM CDT	Severe Thunderstorm Warning	EWX	Burnet, Llano	30 min

Nearby

Special Weather Statements in Texas, 2015 Every special weather statement 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.