Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2015
Severe Thunderstorm Warning 598, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at Aug 21, 2015, 9:53 PM CDT for 4 counties in Oklahoma. It was in force for 37 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 21, 2015, 9:53 PM CDT (02:53 UTC)
- Expired
- Aug 21, 2015, 10:30 PM CDT
- In force
- 37 min
- Issued by
- NWS Norman, OK
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Alfalfa County, OK, Garfield County, OK, Grant County, OK, Major County, OK
The radar
The Vance AFB radar (KVNX), 21 km from the middle of the area, began a volume at 02:53 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, 2.9 hours before the alert went out and 161 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.
- 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
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, 40 minutes earlier.
Area forecast discussion, Aug 21, 9:13 PM CDT, 40 minutes before
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</html>Hazardous weather outlook, Aug 21, 9:37 PM CDT, 16 minutes before
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Special weather statement, Aug 21, 7:04 PM CDT, 2 hours 49 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
704 PM CDT FRI AUG 21 2015
OKZ005-220045-
WOODS OK-
704 PM CDT FRI AUG 21 2015
...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN WOODS COUNTY UNTIL 745
PM CDT...
AT 702 PM CDT...STRONG THUNDERSTORMS WERE ALONG A LINE EXTENDING FROM
4 MILES NORTHWEST OF ALVA TO 11 MILES SOUTHWEST OF HARDTNER TO 9
MILES SOUTH OF BUTTERMILK...MOVING EAST AT 15 MPH.
HAZARDS INCLUDE...
HAIL UP TO ONE-HALF INCH DIAMETER...
WIND GUSTS TO 40 MPH...
FREQUENT CLOUD TO GROUND LIGHTNING...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
MONITOR THE WEATHER SITUATION CLOSELY AND BE ALERT FOR THREATENING
WEATHER CONDITIONS.
&&
LAT...LON 3700 9855 3687 9854 3675 9856 3677 9876
3679 9922 3700 9944
TIME...MOT...LOC 0002Z 260DEG 12KT 3684 9873 3693 9884 3697 9930
30Special weather statement, Aug 21, 7:45 PM CDT, 2 hours 8 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, 57 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
&&
DWLocal storm report, Aug 21, 9:39 PM CDT, 14 minutes before
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</html>The office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 21, 7:04 PM CDT | Special Weather Statement | OUN | Woods | 41 min |
| Aug 21, 7:45 PM CDT | Special Weather Statement | OUN | Alfalfa | 30 min |
| Aug 21, 8:07 PM CDT | Severe Thunderstorm Warning | OUN | Alfalfa, Woods | 38 min |
| Aug 21, 8:36 PM CDT | Severe Thunderstorm Warning | OUN | Alfalfa, Woods | 39 min |
| Aug 21, 9:09 PM CDT | Severe Thunderstorm Warning | OUN | Alfalfa, Woods | 51 min |
| Aug 21, 9:20 PM CDT | Severe Thunderstorm Warning | OUN | Alfalfa, Grant | 40 min |
| Aug 21, 10:22 PM CDT | Severe Thunderstorm Warning | OUN | Garfield, Grant, Kay, Noble | 38 min |
| Aug 21, 11:13 PM CDT | Special Weather Statement | OUN | Kay, Noble | 47 min |
| Aug 22, 12:17 AM CDT | Special Weather Statement | OUN | Payne | 28 min |
| Aug 22, 12:39 AM CDT | Special Weather Statement | OUN | Grant | 36 min |
| Aug 22, 1:02 AM CDT | Severe Thunderstorm Warning | OUN | Grant | 31 min |
| Aug 22, 1:47 AM CDT | Special Weather Statement | OUN | Noble | 28 min |
| Aug 22, 2:16 AM CDT | Special Weather Statement | OUN | Noble | 29 min |
| Aug 22, 2:42 AM CDT | Special Weather Statement | OUN | Noble | 18 min |
| Aug 22, 3:09 AM CDT | Special Weather Statement | OUN | Payne | 36 min |
| Aug 22, 3:14 AM CDT | Special Weather Statement | OUN | Kay | 31 min |
| Aug 22, 4:05 AM CDT | Special Weather Statement | OUN | Kay | 25 min |
| Aug 22, 4:45 AM CDT | Special Weather Statement | OUN | Kay | 30 min |
| Aug 22, 5:21 AM CDT | Areal Flood Advisory | OUN | Grant, Kay | 114 min |
| Aug 22, 6:01 AM CDT | Flash Flood Warning | OUN | Grant, Kay | 3 hr |
| Aug 22, 6:21 AM CDT | Special Weather Statement | OUN | Kay, Noble | 24 min |
| Aug 22, 6:55 AM CDT | Special Weather Statement | OUN | Noble | 35 min |
| Aug 22, 7:22 AM CDT | Special Weather Statement | OUN | Payne | 23 min |
| Aug 22, 7:32 AM CDT | Areal Flood Advisory | OUN | Noble, Payne | 3 hr |
| Aug 22, 7:46 AM CDT | Special Weather Statement | OUN | Payne | 29 min |
| Aug 22, 7:49 AM CDT | Severe Thunderstorm Warning | OUN | Noble, Payne | 41 min |
| Aug 22, 8:02 AM CDT | Special Weather Statement | OUN | Payne | 13 min |
| Aug 22, 8:10 AM CDT | Severe Thunderstorm Warning | OUN | Lincoln, Logan, Payne | 50 min |
| Aug 22, 8:28 AM CDT | Special Weather Statement | OUN | Oklahoma | 32 min |
| Aug 22, 8:48 AM CDT | Special Weather Statement | OUN | Oklahoma | 27 min |
| Aug 22, 9:00 AM CDT | Special Weather Statement | OUN | Lincoln | 30 min |
| Aug 22, 9:07 AM CDT | Special Weather Statement | OUN | Okfuskee | 23 min |
| Aug 22, 9:30 AM CDT | Areal Flood Warning | OUN | Kay, Noble, Payne | 4 hr |
| Aug 22, 9:36 AM CDT | Special Weather Statement | OUN | Hughes, Seminole | 24 min |
| Aug 22, 9:54 AM CDT | Special Weather Statement | OUN | Hughes | 36 min |
| Aug 22, 10:03 AM CDT | Severe Thunderstorm Warning | OUN | Hughes | 42 min |
| Aug 22, 10:35 AM CDT | Special Weather Statement | OUN | Hughes | 25 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.