Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 579, NWS Norman, OK

October 17, 20117 counties in Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Oct 17, 2011, 8:15 PM CDT for 7 counties in Oklahoma. It was in force for 49 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: Oct 17, 2011, 8:15 PM CDT (01:15 UTC)
Expired: Oct 17, 2011, 9:04 PM CDT
In force: 49 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

Counties Atoka County, OK, Bryan County, OK, Carter County, OK, Coal County, OK, Johnston County, OK, Love County, OK, Marshall County, OK

The radar

The Norman radar (KTLX), 137 km from the middle of the area, began a volume at 01:17 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

Norman, OK (KOUN), launched 00:00Z, 1.3 hours before the alert went out and 132 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: 19 J/kg
Mixed-layer CIN: -528 J/kg
Mixed-layer LCL: 1195 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 144 m²/s²
0-3 km storm-relative helicity: 252 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.4

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 Norman, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at Oct 17, 7:54 PM CDT, 21 minutes earlier.

Area forecast discussion, Oct 17, 7:54 PM CDT, 21 minutes before

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Hazardous weather outlook, Oct 17, 7:45 PM CDT, 30 minutes before

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In the hours before

Special weather statement, Oct 17, 6:45 PM CDT, 1 hour 30 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
645 PM CDT MON OCT 17 2011

OKZ028-030>032-039>042-045>047-180015-
CARTER OK-GARVIN OK-HUGHES OK-JEFFERSON OK-JOHNSTON OK-MCCLAIN OK-
MURRAY OK-PONTOTOC OK-POTTAWATOMIE OK-SEMINOLE OK-STEPHENS OK-
645 PM CDT MON OCT 17 2011

...SIGNIFICANT WEATHER ADVISORY...

THIS SIGNIFICANT WEATHER ADVISORY IS FOR CARTER...GARVIN...HUGHES...
JEFFERSON...JOHNSTON...MCCLAIN...MURRAY...PONTOTOC...POTTAWATOMIE...
SEMINOLE AND STEPHENS COUNTIES.

AT 644 PM CDT...A LINE OF SCATTERED STRONG THUNDERSTORMS WAS LOCATED
FROM 7 MILES SOUTHEAST OF CROMWELL... TO NEAR ADA... TO 5 MILES
SOUTHEAST OF DURANT...MOVING NORTHEAST AT 25 MPH.

HAZARDS INCLUDE...
HAIL UP TO THE SIZE OF NICKELS...
WIND GUSTS TO 40 MPH...

LAT...LON 3455 9669 3407 9765 3444 9793 3489 9705
      3534 9645 3534 9643 3530 9643 3530 9615
      3527 9598

MAXWELL

Local storm report, Oct 17, 7:14 PM CDT, 1 hour 1 minute before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
714 PM CDT MON OCT 17 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0710 PM     HAIL             DAVIS                   34.50N 97.12W
10/17/2011  E1.00 INCH       MURRAY             OK   LAW ENFORCEMENT

&&

MA

Local storm report, Oct 17, 7:21 PM CDT, 54 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
721 PM CDT MON OCT 17 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0715 PM     HAIL             SULPHUR                 34.51N 96.98W
10/17/2011  E1.00 INCH       MURRAY             OK   LAW ENFORCEMENT

            DIME TO QUARTER SIZED HAIL REPORTED

&&

MA

Special weather statement, Oct 17, 7:38 PM CDT, 37 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
738 PM CDT MON OCT 17 2011

OKZ045-180115-
JEFFERSON OK-
738 PM CDT MON OCT 17 2011

...SIGNIFICANT WEATHER ADVISORY...

THIS SIGNIFICANT WEATHER ADVISORY IS FOR JEFFERSON COUNTY.

AT 739 PM CDT...A LINE OF STRONG THUNDERSTORMS WAS LOCATED FROM 11
MILES WEST OF CORNISH TO 9 MILES SOUTHWEST OF OSCAR...MOVING EAST AT
40 MPH.

HAZARDS INCLUDE...
HAIL UP TO THE SIZE OF NICKELS...
WIND GUSTS TO 50 MPH...

LAT...LON 3386 9791 3422 9783 3426 9757 3392 9757
      3391 9760 3396 9761 3399 9768 3389 9778
      3387 9781 3385 9790

MAXWELL

Local storm report, Oct 17, 7:42 PM CDT, 33 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
742 PM CDT MON OCT 17 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0703 PM     HAIL             1 N HOLDENVILLE         35.10N 96.40W
10/17/2011  E1.75 INCH       HUGHES             OK   PUBLIC

            DELAYED REPORT FROM MOTORIST NORTH OF HOLDENVILLE

&&

MA

Local storm report, Oct 17, 8:15 PM CDT, 0 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
Oct 17, 7:06 PM CDT	Severe Thunderstorm Warning	OUN	Atoka, Carter, Coal, Garvin, Johnston, Murray and 1 more	69 min
Oct 17, 7:38 PM CDT	Special Weather Statement	OUN	Jefferson	37 min
Oct 17, 7:43 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Love, Marshall	47 min
Oct 17, 7:49 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Jefferson, Murray	16 min
Oct 18, 4:37 AM CDT	Wind Advisory	OUN	Alfalfa, Beckham, Blaine, Caddo, Comanche, Custer and 13 more	14 hr
Oct 18, 3:31 PM CDT	Frost Advisory	OUN	Alfalfa, Blaine, Custer, Garfield, Grant, Kay and 5 more	17 hr
Oct 18, 3:31 PM CDT	Freeze Watch	OUN	Alfalfa, Atoka, Beckham, Blaine, Caddo, Canadian and 29 more	13 hr

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2011 Every severe thunderstorm warning in 2011

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.