Alert archive / Texas / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 30, NWS San Angelo, TX

April 21, 2014Mason County, Texas

NWS San Angelo, TX issued this severe thunderstorm warning at Apr 21, 2014, 5:54 PM CDT for Mason County, Texas. It was in force for 66 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: Apr 21, 2014, 5:54 PM CDT (22:54 UTC)
Expired: Apr 21, 2014, 7:00 PM CDT
In force: 66 min
Issued by: NWS San Angelo, TX
Area: Storm-based polygon
Hail: 1.5 in
Wind: 60.0 mph

County Mason County, TX

The radar

The San Angelo radar (KSJT), 141 km from the middle of the area, began a volume at 22:54 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
Apr 21, 2:52 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Del Rio, TX (KDLF), launched 12:00Z, 10.9 hours before the alert went out and 216 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: 1251 J/kg
Mixed-layer CIN: -190 J/kg
Mixed-layer LCL: 710 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 118 m²/s²
0-3 km storm-relative helicity: 69 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

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 Apr 21, 3:32 PM CDT, 2 hours 22 minutes earlier.

Area forecast discussion, Apr 21, 3:32 PM CDT, 2 hours 22 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN ANGELO TX
332 PM CDT MON APR 21 2014

.SHORT TERM...
(Today and Tonight)

A weak cold front/outflow boundary will continue to slowly move
south across West Central Texas this afternoon, then stall somewhere
near the Interstate 10 corridor this evening. Isolated to scattered
showers and thunderstorms will develop this afternoon ahead of the
boundary, which is depicted well by most of the high resolution
models. A fairly unstable environment is present ahead of the
boundary, with 1000-2000 J/KG SBCAPE along the Interstate 10
corridor, but 0-6 KM bulk shear values are not too impressive,
generally in the 15 to 25 knot range. A few strong to severe
thunderstorms will be possible, with large hail and damaging winds
being the main concerns. Most convection should move south of the
area or dissipate by 06z. Above normal temperatures are once again
forecast on Tuesday with highs in the mid to upper 80s, as upper
level ridging dominates. No rain is forecast on Tuesday.

.LONG TERM...
(Tuesday through the Weekend)

A little more active weather pattern across West Central Texas for
the next week, as several rounds of convection will be possible
after today. Weak upper level ridge holds for for Tuesday across the
area, limit thunderstorm potential. As a deeper trough digs into the
Southwest US, a shortwave will rotate across West Texas by late
Wednesday afternoon. Looks like a dryline setup from the Panhandle
south into the Permian Basin, with storms spreading east off the
dryline Wednesday night. Will continue the mention of a few isolated
storms during the afternoon, but next chances will continue during
the evening hours.

Cold front drops through the area during the day on Thursday,
temporarily scouring the moisture out. Front stalls and moisture
surges back north on Friday. Deeper upper level trough moves into
New Mexico and Colorado for the weekend, setting the stage for a
little more widespread shower and thunderstorm event. Still, if the
system shifts even a little farther north, West Central Texas gets
dryslotted very quickly. Given the odds this year, wont rule that
one out, so will keep the slight chance pops as is.
&&

.PRELIMINARY POINT TEMPS/POPS...
Abilene 	 59  83  60  86  63 /  10   0   5  10  30
San Angelo 	 60  86  60  89  64 /  20   5   5  10  30
Junction 	 60  85  61  85  63 /  40   5   5  10  20

&&

.SJT WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

daniels/07

Hazardous weather outlook, Apr 21, 2:38 PM CDT, 3 hours 16 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SAN ANGELO TX
238 PM CDT MON APR 21 2014

TXZ049-054-064>066-071>073-076>078-098-099-113-114-127-128-139-
140-154-155-168>170-221945-
FISHER-NOLAN-STERLING-COKE-RUNNELS-IRION-TOM GREEN-CONCHO-
CROCKETT-SCHLEICHER-SUTTON-HASKELL-THROCKMORTON-JONES-SHACKELFORD-
TAYLOR-CALLAHAN-COLEMAN-BROWN-MCCULLOCH-SAN SABA-MENARD-KIMBLE-
MASON-
238 PM CDT MON APR 21 2014

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF WEST CENTRAL
TEXAS.

.DAY ONE...THIS AFTERNOON AND TONIGHT

SCATTERED SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE MAINLY SOUTH
OF A BARNHART...TO SAN SABA LINE THIS AFTERNOON AND EVENING. A FEW
STORMS MAY BECOME STRONG TO SEVERE WITH LARGE HAIL...DAMAGING
WINDS AND DANGEROUS LIGHTNING BEING THE MAIN HAZARDS

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE ACROSS MUCH OF WEST
CENTRAL TEXAS WEDNESDAY AFTERNOON AND EVENING. A FEW STORMS MAY
BECOME STRONG TO SEVERE WITH LARGE HAIL...DAMAGING WINDS AND
DANGEROUS LIGHTNING BEING THE MAIN HAZARDS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE REQUIRED LATER THIS AFTERNOON OR EVENING.

In the hours before

Special weather statement, Apr 21, 5:13 PM CDT, 41 minutes before

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Local storm report, Apr 21, 5:16 PM CDT, 38 minutes before

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Local storm report, Apr 21, 5:29 PM CDT, 25 minutes before

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Local storm report, Apr 21, 5:32 PM CDT, 22 minutes before

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Special weather statement, Apr 21, 5:33 PM CDT, 21 minutes before

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Local storm report, Apr 21, 5:40 PM CDT, 14 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
Apr 20, 11:47 PM CDT	Special Weather Statement	SJT	Haskell	58 min
Apr 21, 12:49 AM CDT	Special Weather Statement	SJT	Throckmorton	26 min
Apr 21, 3:38 PM CDT	Special Weather Statement	SJT	Menard	67 min
Apr 21, 4:02 PM CDT	Special Weather Statement	SJT	Mason	28 min
Apr 21, 4:06 PM CDT	Special Weather Statement	SJT	San Saba	24 min
Apr 21, 4:12 PM CDT	Severe Thunderstorm Warning	SJT	San Saba	33 min
Apr 21, 4:18 PM CDT	Severe Thunderstorm Warning	SJT	Mason, San Saba	27 min
Apr 21, 4:28 PM CDT	Special Weather Statement	SJT	Schleicher	32 min
Apr 21, 4:43 PM CDT	Severe Thunderstorm Warning	SJT	Mason	32 min
Apr 21, 4:53 PM CDT	Areal Flood Advisory	SJT	Mason	112 min
Apr 21, 5:01 PM CDT	Severe Thunderstorm Warning	SJT	San Saba	44 min
Apr 21, 5:13 PM CDT	Special Weather Statement	SJT	Mason	32 min
Apr 21, 5:20 PM CDT	Severe Thunderstorm Warning	SJT	Mason	40 min
Apr 21, 5:33 PM CDT	Special Weather Statement	SJT	Mason	27 min
Apr 21, 6:10 PM CDT	Special Weather Statement	SJT	Menard	35 min
Apr 21, 6:40 PM CDT	Special Weather Statement	SJT	Schleicher	35 min
Apr 21, 6:58 PM CDT	Special Weather Statement	SJT	Mason	32 min

Nearby

Severe Thunderstorm Warnings in Texas, 2014 Every severe thunderstorm warning in 2014

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.