Alert archive / Texas / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 219, NWS Fort Worth, TX

May 18, 2015Bosque County, Erath County, Somervell County, Texas

NWS Fort Worth, TX issued this severe thunderstorm warning at May 18, 2015, 4:50 PM CDT for Bosque County, Erath County, Somervell County, Texas. It was in force for 40 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: May 18, 2015, 4:50 PM CDT (21:50 UTC)
Expired: May 18, 2015, 5:30 PM CDT
In force: 40 min
Issued by: NWS Fort Worth, TX
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Bosque County, TX, Erath County, TX, Somervell County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 74 km from the middle of the area, began a volume at 22:01 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

Shreveport, LA (KBAD), launched 12:00Z, 9.8 hours before the alert went out and 390 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: 840 J/kg
Mixed-layer CIN: -50 J/kg
Mixed-layer LCL: 899 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 86 m²/s²
0-3 km storm-relative helicity: 105 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 1.6

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 Fort Worth, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at May 18, 3:34 PM CDT, 1 hour 16 minutes earlier.

Area forecast discussion, May 18, 3:34 PM CDT, 1 hour 16 minutes before

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Hazardous weather outlook, May 18, 3:20 PM CDT, 1 hour 30 minutes before

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In the hours before

Special weather statement, May 18, 3:19 PM CDT, 1 hour 31 minutes before

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Special weather statement, May 18, 3:59 PM CDT, 51 minutes before

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Special weather statement, May 18, 4:15 PM CDT, 35 minutes before

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Local storm report, May 18, 4:32 PM CDT, 18 minutes before

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Special weather statement, May 18, 4:37 PM CDT, 13 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE FORT WORTH TX
437 PM CDT MON MAY 18 2015

TXZ130-143-144-182215-
HAMILTON TX-BOSQUE TX-ERATH TX-
437 PM CDT MON MAY 18 2015

...SIGNIFICANT WEATHER ADVISORY FOR NORTH CENTRAL HAMILTON...
SOUTHEASTERN ERATH AND NORTHWESTERN BOSQUE COUNTIES UNTIL 515 PM
CDT...

AT 436 PM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR
IREDELL...OR 21 MILES SOUTHEAST OF STEPHENVILLE...MOVING EAST AT 25
MPH.

HALF INCH HAIL AND WIND GUSTS UP TO 50 MPH WILL BE POSSIBLE WITH THIS
STORM.

LOCATIONS IMPACTED INCLUDE...
HICO...IREDELL AND WALNUT SPRINGS.

LAT...LON 3216 9803 3213 9789 3209 9787 3212 9781
      3209 9767 3185 9778 3194 9801 3199 9812
TIME...MOT...LOC 2136Z 276DEG 21KT 3205 9791

AJS

The office that day

Everything else NWS Fort Worth, TX issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 17, 7:05 PM CDT	Areal Flood Warning	FWD	Ellis	12 hr
May 18, 6:51 AM CDT	River Flood Warning	FWD	Wise	20 hr
May 18, 7:56 AM CDT	Areal Flood Advisory	FWD	Leon, Robertson	3 hr
May 18, 10:32 AM CDT	River Flood Warning	FWD	Delta, Hopkins	14 days
May 18, 3:19 PM CDT	Special Weather Statement	FWD	Bosque	41 min
May 18, 3:45 PM CDT	Severe Thunderstorm Warning	FWD	Grayson	45 min
May 18, 3:59 PM CDT	Special Weather Statement	FWD	Bosque	46 min
May 18, 4:13 PM CDT	Areal Flood Advisory	FWD	Robertson	2 hr
May 18, 4:15 PM CDT	Special Weather Statement	FWD	Robertson	45 min
May 18, 4:37 PM CDT	Special Weather Statement	FWD	Somervell	38 min
May 18, 4:46 PM CDT	Areal Flood Advisory	FWD	Freestone, Limestone	119 min
May 18, 4:56 PM CDT	Special Weather Statement	FWD	Freestone, Limestone	49 min
May 18, 5:05 PM CDT	Severe Thunderstorm Warning	FWD	Lampasas	28 min
May 18, 5:16 PM CDT	Special Weather Statement	FWD	Coryell	44 min
May 18, 5:47 PM CDT	Special Weather Statement	FWD	Limestone	43 min
May 18, 6:05 PM CDT	Special Weather Statement	FWD	Mills	40 min
May 18, 6:34 PM CDT	Special Weather Statement	FWD	McLennan	41 min
May 18, 6:42 PM CDT	Areal Flood Advisory	FWD	Bell, Coryell, Falls, McLennan	2 hr
May 18, 6:57 PM CDT	Severe Thunderstorm Warning	FWD	Bell, Coryell, Falls, McLennan	48 min

Nearby

Severe Thunderstorm Warnings in Texas, 2015 Every severe thunderstorm warning 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.