Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 600, NWS Norman, OK

August 22, 2015Grant County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Aug 22, 2015, 1:02 AM CDT for Grant County, Oklahoma. It was in force for 31 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
Aug 22, 2015, 1:02 AM CDT (06:02 UTC)
Expired
Aug 22, 2015, 1:33 AM CDT
In force
31 min
Issued by
NWS Norman, OK
Area
Storm-based polygon
Hail
1.25 in
Wind
60.0 mph

County Grant County, OK

The radar

The Vance AFB radar (KVNX), 31 km from the middle of the area, began a volume at 06:05 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, 6.0 hours before the alert went out and 179 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, Norman, OK at 00:00Z on 2015-08-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1039 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, Norman, OK at 00:00Z on 2015-08-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -5 square meters per square second.19395878Sfc1 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
1039 J/kg
Mixed-layer CIN
-91 J/kg
Mixed-layer LCL
1680 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
-5 m²/s²
0-3 km storm-relative helicity
114 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

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 Aug 21, 9:13 PM CDT, 3 hours 49 minutes earlier.

Area forecast discussion, Aug 21, 9:13 PM CDT, 3 hours 49 minutes before
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Hazardous weather outlook, Aug 21, 11:24 PM CDT, 1 hour 38 minutes before
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In the hours before

Special weather statement, Aug 21, 7:45 PM CDT, 5 hours 17 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
745 PM CDT FRI AUG 21 2015

OKZ005-006-220115-
ALFALFA OK-WOODS OK-
745 PM CDT FRI AUG 21 2015

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN ALFALFA AND
NORTHEASTERN WOODS COUNTIES UNTIL 815 PM CDT...

AT 744 PM CDT...STRONG THUNDERSTORMS WERE ALONG A LINE EXTENDING FROM
4 MILES NORTHWEST OF BURLINGTON TO 7 MILES SOUTHWEST OF HARDTNER...
MOVING EAST AT 35 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...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MONITOR THE WEATHER SITUATION CLOSELY AND BE ALERT FOR THREATENING
WEATHER CONDITIONS.

&&

LAT...LON 3699 9819 3684 9838 3683 9893 3700 9895
TIME...MOT...LOC 0044Z 255DEG 31KT 3696 9846 3694 9874

30
Local storm report, Aug 21, 8:56 PM CDT, 4 hours 6 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
856 PM CDT FRI AUG 21 2015

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

0830 PM     TSTM WND GST     7 SSW ALVA              36.71N 98.72W
08/21/2015  M78.00 MPH       WOODS              OK   MESONET

0835 PM     TSTM WND GST     7 SSW ALVA              36.71N 98.72W
08/21/2015  M61.00 MPH       WOODS              OK   MESONET

0845 PM     TSTM WND GST     7 SSW ALVA              36.71N 98.72W
08/21/2015  M78.00 MPH       WOODS              OK   MESONET

&&

DW
Local storm report, Aug 21, 9:39 PM CDT, 3 hours 23 minutes before
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Special weather statement, Aug 21, 11:13 PM CDT, 1 hour 49 minutes before
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Special weather statement, Aug 22, 12:17 AM CDT, 45 minutes before
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Special weather statement, Aug 22, 12:39 AM CDT, 23 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Aug 21, 7:04 PM CDTSpecial Weather StatementOUNWoods41 min
Aug 21, 7:45 PM CDTSpecial Weather StatementOUNAlfalfa30 min
Aug 21, 8:07 PM CDTSevere Thunderstorm WarningOUNAlfalfa, Woods38 min
Aug 21, 8:36 PM CDTSevere Thunderstorm WarningOUNAlfalfa, Woods39 min
Aug 21, 9:09 PM CDTSevere Thunderstorm WarningOUNAlfalfa, Woods51 min
Aug 21, 9:20 PM CDTSevere Thunderstorm WarningOUNAlfalfa, Grant40 min
Aug 21, 9:53 PM CDTSevere Thunderstorm WarningOUNAlfalfa, Garfield, Grant, Major37 min
Aug 21, 10:22 PM CDTSevere Thunderstorm WarningOUNGarfield, Grant, Kay, Noble38 min
Aug 21, 11:13 PM CDTSpecial Weather StatementOUNKay, Noble47 min
Aug 22, 12:17 AM CDTSpecial Weather StatementOUNPayne28 min
Aug 22, 12:39 AM CDTSpecial Weather StatementOUNGrant36 min
Aug 22, 1:47 AM CDTSpecial Weather StatementOUNNoble28 min
Aug 22, 2:16 AM CDTSpecial Weather StatementOUNNoble29 min
Aug 22, 2:42 AM CDTSpecial Weather StatementOUNNoble18 min
Aug 22, 3:09 AM CDTSpecial Weather StatementOUNPayne36 min
Aug 22, 3:14 AM CDTSpecial Weather StatementOUNKay31 min
Aug 22, 4:05 AM CDTSpecial Weather StatementOUNKay25 min
Aug 22, 4:45 AM CDTSpecial Weather StatementOUNKay30 min
Aug 22, 5:21 AM CDTAreal Flood AdvisoryOUNGrant, Kay114 min
Aug 22, 6:01 AM CDTFlash Flood WarningOUNGrant, Kay3 hr
Aug 22, 6:21 AM CDTSpecial Weather StatementOUNKay, Noble24 min
Aug 22, 6:55 AM CDTSpecial Weather StatementOUNNoble35 min
Aug 22, 7:22 AM CDTSpecial Weather StatementOUNPayne23 min
Aug 22, 7:32 AM CDTAreal Flood AdvisoryOUNNoble, Payne3 hr
Aug 22, 7:46 AM CDTSpecial Weather StatementOUNPayne29 min
Aug 22, 7:49 AM CDTSevere Thunderstorm WarningOUNNoble, Payne41 min
Aug 22, 8:02 AM CDTSpecial Weather StatementOUNPayne13 min
Aug 22, 8:10 AM CDTSevere Thunderstorm WarningOUNLincoln, Logan, Payne50 min
Aug 22, 8:28 AM CDTSpecial Weather StatementOUNOklahoma32 min
Aug 22, 8:48 AM CDTSpecial Weather StatementOUNOklahoma27 min
Aug 22, 9:00 AM CDTSpecial Weather StatementOUNLincoln30 min
Aug 22, 9:07 AM CDTSpecial Weather StatementOUNOkfuskee23 min
Aug 22, 9:30 AM CDTAreal Flood WarningOUNKay, Noble, Payne4 hr
Aug 22, 9:36 AM CDTSpecial Weather StatementOUNHughes, Seminole24 min
Aug 22, 9:54 AM CDTSpecial Weather StatementOUNHughes36 min
Aug 22, 10:03 AM CDTSevere Thunderstorm WarningOUNHughes42 min
Aug 22, 10:35 AM CDTSpecial Weather StatementOUNHughes25 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2015Every 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.