Alert archive / Texas / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 554, NWS Norman, OK

June 19, 2013Knox County, Texas

NWS Norman, OK issued this severe thunderstorm warning at Jun 19, 2013, 12:36 PM CDT for Knox County, Texas. It was in force for 39 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 19, 2013, 12:36 PM CDT (17:36 UTC)
Expired: Jun 19, 2013, 1:15 PM CDT
In force: 39 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

County Knox County, TX

The radar

The Altus AFB radar (KFDR), 110 km from the middle of the area, began a volume at 17:36 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

Amarillo Airport, TX (KAMA), launched 12:00Z, 5.6 hours before the alert went out and 255 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: 1212 J/kg
Mixed-layer CIN: -116 J/kg
Mixed-layer LCL: 760 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 294 m²/s²
0-3 km storm-relative helicity: 416 m²/s²
Significant tornado parameter: 1.8
Supercell composite: 20.9

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 Norman, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 19, 11:40 AM CDT, 56 minutes earlier.

Area forecast discussion, Jun 19, 11:40 AM CDT, 56 minutes before

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Hazardous weather outlook, Jun 19, 12:07 PM CDT, 29 minutes before

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In the hours before

Special weather statement, Jun 19, 10:28 AM CDT, 2 hours 8 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
1028 AM CDT WED JUN 19 2013

TXZ083-084-191615-
HARDEMAN TX-FOARD TX-
1028 AM CDT WED JUN 19 2013

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN HARDEMAN AND
NORTHERN FOARD COUNTIES UNTIL 1115 AM CDT...

AT 1025 AM CDT...A STRONG THUNDERSTORM WAS LOCATED NEAR SWEARINGEN...
OR 10 MILES NORTHEAST OF PADUCAH...MOVING SOUTHEAST AT 30 MPH.

HAZARDS INCLUDE...
HAIL UP TO THE SIZE OF NICKELS...
WIND GUSTS TO 50 MPH...
MINOR FLOODING IN AREAS OF POOR DRAINAGE...
FREQUENT CLOUD TO GROUND LIGHTNING...

LOCATIONS IMPACTED INCLUDE...
LAZARE AND COPPERS BREAK STATE PARK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MONITOR THE WEATHER SITUATION CLOSELY...AND BE ALERT FOR THREATENING
WEATHER CONDITIONS IN CASE THIS STORM BECOMES SEVERE.

&&

LAT...LON 3423 10005 3424 10003 3424 10001 3423 10000
      3429 10000 3410 9967 3409 9968 3384 9994
      3384 9996 3389 10005
TIME...MOT...LOC 1525Z 309DEG 24KT 3415 10013

AUSTIN

Special weather statement, Jun 19, 11:21 AM CDT, 1 hour 15 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
1121 AM CDT WED JUN 19 2013

TXZ083-084-087-191645-
HARDEMAN TX-FOARD TX-KNOX TX-
1121 AM CDT WED JUN 19 2013

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN HARDEMAN...FOARD AND
NORTHERN KNOX COUNTIES UNTIL 1145 AM CDT...

AT 1114 AM CDT...STRONG THUNDERSTORMS WERE LOCATED ACROSS
WESTERN FOARD COUNTY...WEST OF CROWELL... MOVING SOUTHEAST AT 20 MPH.

HAZARDS INCLUDE...
HAIL UP TO ONE-HALF INCH DIAMETER...
WIND GUSTS TO 40 MPH...
FLOODING...

LOCATIONS IMPACTED INCLUDE...
CROWELL...MARGARET...TRUSCOTT...LAZARE AND COPPERS BREAK STATE PARK.

LAT...LON 3423 10005 3424 10001 3423 10000 3429 10000
      3434 9996 3409 9952 3382 9965 3365 9999
      3383 10000 3384 10005
TIME...MOT...LOC 1614Z 341DEG 16KT 3396 10011

CMS

Special weather statement, Jun 19, 11:57 AM CDT, 39 minutes before

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The office that day

Everything else NWS Norman, OK issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 19, 2:03 AM CDT	Special Weather Statement	OUN	Harper	27 min
Jun 19, 2:31 AM CDT	Special Weather Statement	OUN	Harper	29 min
Jun 19, 4:39 AM CDT	Special Weather Statement	OUN	Ellis	21 min
Jun 19, 5:06 AM CDT	Special Weather Statement	OUN	Ellis	24 min
Jun 19, 5:31 AM CDT	Special Weather Statement	OUN	Roger Mills	29 min
Jun 19, 4:33 PM CDT	Special Weather Statement	OUN	Love	27 min
Jun 19, 10:28 AM CDT	Special Weather Statement	OUN	Foard	47 min
Jun 19, 11:21 AM CDT	Special Weather Statement	OUN	Foard	24 min
Jun 19, 11:30 AM CDT	Flash Flood Warning	OUN	Foard, Hardeman	2 hr
Jun 19, 11:57 AM CDT	Special Weather Statement	OUN	Foard, Knox	63 min
Jun 19, 1:13 PM CDT	Severe Thunderstorm Warning	OUN	Baylor, Knox	32 min

Nearby

Severe Thunderstorm Warnings in Texas, 2013 Every severe thunderstorm warning in 2013

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.