Alert archive / Texas / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 171, NWS San Angelo, TX

June 9, 2017Mason County, Texas

NWS San Angelo, TX issued this severe thunderstorm warning at Jun 9, 2017, 5:50 PM CDT for Mason County, Texas. It was in force for 55 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
Jun 9, 2017, 5:50 PM CDT (22:50 UTC)
Expired
Jun 9, 2017, 6:45 PM CDT
In force
55 min
Issued by
NWS San Angelo, TX
Area
Storm-based polygon
Hail
1.0 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 22:50 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, 10.8 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-pSkew-T log-p diagram, Del Rio, TX at 12:00Z on 2017-06-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 48 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Del Rio, TX at 12:00Z on 2017-06-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 22 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
48 J/kg
Mixed-layer CIN
-362 J/kg
Mixed-layer LCL
1646 m above ground
0-6 km bulk shear
16 kt
0-1 km storm-relative helicity
22 m²/s²
0-3 km storm-relative helicity
171 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 Jun 9, 3:45 PM CDT, 2 hours 5 minutes earlier.

Area forecast discussion, Jun 9, 3:45 PM CDT, 2 hours 5 minutes before
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Hazardous weather outlook, Jun 9, 2:52 PM CDT, 2 hours 58 minutes before
Hazardous Weather Outlook
National Weather Service San Angelo TX
252 PM CDT Fri Jun 9 2017

TXZ049-054-064>066-071>073-076>078-098-099-113-114-127-128-139-
140-154-155-168>170-102000-
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-
252 PM CDT Fri Jun 9 2017

This Hazardous Weather Outlook is for portions of west central
Texas.

.DAY ONE...This Afternoon and Tonight

Isolated strong to severe thunderstorms are possible late this
afternoon and evening across the area southeast of a Brownwood
to Junction line. The weather threats include damaging winds
in addition to dangerous lightning.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated at this time.

In the hours before

Special weather statement, Jun 9, 4:16 PM CDT, 1 hour 34 minutes before
Special Weather Statement
National Weather Service San Angelo TX
416 PM CDT FRI JUN 9 2017

TXZ170-092200-
Mason TX-
416 PM CDT FRI JUN 9 2017

...SIGNIFICANT WEATHER ADVISORY FOR MASON COUNTY UNTIL 500 PM CDT...

At 414 PM CDT, Doppler radar was tracking a strong thunderstorm 8
miles northwest of Loyal Valley, or 9 miles southeast of Mason,
moving southeast at 5 mph.

Half inch hail and wind gusts up to 50 mph will be possible with this
storm.

Locations impacted include...
Mason, Pontotoc, Loyal Valley, Fredonia, Katemcy, Streeter, US-377
near The Mason-McCulloch County Line, US-87 Near The Mason-Gillespie
County Line.

LAT...LON 3094 9948 3094 9910 3092 9909 3092 9897
      3050 9896 3050 9930
TIME...MOT...LOC 2114Z 330DEG 6KT 3064 9914

sn
Special weather statement, Jun 9, 5:19 PM CDT, 31 minutes before
Special Weather Statement
National Weather Service San Angelo TX
519 PM CDT FRI JUN 9 2017

TXZ170-092315-
Mason TX-
519 PM CDT FRI JUN 9 2017

...SIGNIFICANT WEATHER ADVISORY FOR MASON COUNTY UNTIL 615 PM CDT...

At 518 PM CDT, Doppler radar was tracking a strong thunderstorm 10
miles south of Mason, moving southeast at 10 mph.

Nickel size hail and wind gusts of 50 to 55 mph will be possible with
this storm.

Locations impacted include...
Mason, Loyal Valley, Katemcy, Streeter, US-377 near The
Mason-McCulloch County Line, US-87 Near The Mason-Gillespie County
Line.

LAT...LON 3050 9948 3094 9948 3094 9912 3058 9896
      3050 9896
TIME...MOT...LOC 2218Z 329DEG 8KT 3059 9925

sn

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 9, 4:16 PM CDTSpecial Weather StatementSJTMason44 min
Jun 9, 5:19 PM CDTSpecial Weather StatementSJTMason56 min
Jun 9, 6:01 PM CDTAreal Flood AdvisorySJTMason119 min
Jun 9, 6:33 PM CDTFlash Flood WarningSJTMason3 hr
Jun 9, 6:37 PM CDTSpecial Weather StatementSJTKimble53 min
Jun 9, 6:40 PM CDTSpecial Weather StatementSJTMenard65 min
Jun 9, 6:59 PM CDTSevere Thunderstorm WarningSJTKimble61 min

Nearby

Severe Thunderstorm Warnings in Texas, 2017Every 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.