Alert archive / Texas / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 196, NWS San Angelo, TX

July 1, 2017Callahan County, Shackelford County, Taylor County, Texas

NWS San Angelo, TX issued this severe thunderstorm warning at Jul 1, 2017, 5:39 AM CDT for Callahan County, Shackelford County, Taylor County, Texas. It was in force for 51 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: Jul 1, 2017, 5:39 AM CDT (10:39 UTC)
Expired: Jul 1, 2017, 6:30 AM CDT
In force: 51 min
Issued by: NWS San Angelo, TX
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Callahan County, TX, Shackelford County, TX, Taylor County, TX

The radar

The Dyess AFB radar (KDYX), 29 km from the middle of the area, began a volume at 10:41 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 watch it was issued in

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

Issued	Product	Office	Lasted
Jul 1, 2:34 AM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 10.7 hours before the alert went out and 215 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: 1697 J/kg
Mixed-layer CIN: -124 J/kg
Mixed-layer LCL: 1703 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 20 m²/s²
0-3 km storm-relative helicity: 108 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.4

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 San Angelo, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 1, 4:41 AM CDT, 58 minutes earlier.

Area forecast discussion, Jul 1, 4:41 AM CDT, 58 minutes before

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Hazardous weather outlook, Jul 1, 4:25 AM CDT, 1 hour 14 minutes before

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In the hours before

Special weather statement, Jul 1, 2:07 AM CDT, 3 hours 32 minutes before

Special Weather Statement
National Weather Service San Angelo TX
207 AM CDT SAT JUL 1 2017

TXZ098-099-113-114-010745-
Haskell TX-Throckmorton TX-Shackelford TX-Jones TX-
207 AM CDT SAT JUL 1 2017

...SIGNIFICANT WEATHER ADVISORY FOR HASKELL...NORTHEASTERN JONES...
NORTHWESTERN SHACKELFORD AND WESTERN THROCKMORTON COUNTIES UNTIL 245
AM CDT...

At 206 AM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from 7 miles northwest of O'brien to Rule to near
Stamford. Movement was east at 40 mph.

Wind gusts up to 45 mph will be possible with these storms.

Strong thunderstorms will be near...
  O'brien around 215 AM CDT.
  Haskell and Paint Creek around 220 AM CDT.
  Stamford and Lake Stamford Marina around 225 AM CDT.
  Irby around 240 AM CDT.
  Millers Creek Reservoir around 245 AM CDT.

Other locations impacted by these storms include The Intersection Of
US-380 And Highway 222.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Heavy downpours can be expected with these storms, and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3317 9925 3287 9922 3291 9991 3332 9999
      3339 9999 3340 9929
TIME...MOT...LOC 0706Z 269DEG 35KT 3345 9994 3320 9989 3298 9985

JW

Local storm report, Jul 1, 3:28 AM CDT, 2 hours 11 minutes before

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Special weather statement, Jul 1, 4:05 AM CDT, 1 hour 34 minutes before

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Special weather statement, Jul 1, 4:46 AM CDT, 53 minutes before

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The office that day

Everything else NWS San Angelo, TX issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 30, 7:44 PM CDT	Severe Thunderstorm Warning	SJT	Haskell	28 min
Jun 30, 9:58 PM CDT	Special Weather Statement	SJT	Fisher	47 min
Jun 30, 10:39 PM CDT	Severe Thunderstorm Warning	SJT	Fisher, Jones	34 min
Jul 1, 2:07 AM CDT	Special Weather Statement	SJT	Haskell	38 min
Jul 1, 3:58 AM CDT	Severe Thunderstorm Warning	SJT	Fisher, Haskell, Jones, Nolan	47 min
Jul 1, 4:05 AM CDT	Special Weather Statement	SJT	Shackelford	40 min
Jul 1, 4:46 AM CDT	Special Weather Statement	SJT	Haskell, Jones, Nolan	44 min
Jul 1, 5:08 AM CDT	Severe Thunderstorm Warning	SJT	Haskell, Jones, Shackelford, Throckmorton	37 min
Jul 1, 6:29 AM CDT	Areal Flood Advisory	SJT	Callahan, Haskell, Jones, Shackelford, Taylor, Throckmorton	3 hr
Jul 1, 6:32 AM CDT	Special Weather Statement	SJT	Brown	43 min
Jul 1, 6:40 AM CDT	Areal Flood Advisory	SJT	Tom Green	3 hr
Jul 1, 6:55 AM CDT	Severe Thunderstorm Warning	SJT	Brown	50 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.