Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 373, NWS Norman, OK

August 13, 2002Canadian County, Oklahoma County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Aug 13, 2002, 3:29 AM CDT for Canadian County, Oklahoma County, Oklahoma. It was in force for 46 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Aug 13, 2002, 3:29 AM CDT (08:29 UTC)
Expired: Aug 13, 2002, 4:15 AM CDT
In force: 46 min
Issued by: NWS Norman, OK
Area: Counties, with a storm outline in the text

Counties Canadian County, OK, Oklahoma County, OK

The radar

The Norman radar (KTLX), 45 km from the middle of the area, began a volume at 08:33 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.

What was reported inside it

Time	Report	Where	Remark
Aug 13, 3:40 AM CDT	Thunderstorm Wind	Yukon, OK	Two inch diameter tree limbs were downed.

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Aug 12, 11:40 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 8.5 hours before the alert went out and 45 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: 2177 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 1765 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 38 m²/s²
0-3 km storm-relative helicity: 158 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 4.8

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 13, 3:24 AM CDT, 5 minutes earlier.

Area forecast discussion, Aug 13, 3:24 AM CDT, 5 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
324 AM CDT TUE AUG 13 2002

CONVECTION THAT DEVELOPED LATE MONDAY AFTERNOON AND EVENING ALONG A
COLD FRONT IN KANSAS HAS MOVED SOUTHEAST INTO THE FORECAST AREA WITH
ANOTHER MUCH LARGER AREA OF MIXED STRATIFORM AND CONVECTIVE
PRECIPITATION OVER KANSAS DEVELOPING ABOVE THE FRONTAL INVERSION AND
DIRECTLY ASSOCIATED WITH MID/UPPER TROUGH. MID/UPPER TROUGH IS NOW
JUST EXITING THE CENTRAL ROCKIES AND DIGGING AS IT APPROACHES.
BELIEVE TSRA WILL EXPAND AND REDEVELOP SOUTHWARD OUT OF KANSAS AS
THIS TROUGH APPROACHES THIS MORNING WITH PRECIPITATION ENDING THIS
AFTERNOON OVER FAR NORTHWEST OKLAHOMA. CONVECTION NOW MOVING TO NEAR
INTERSTATE 40 IN OKLAHOMA IS EXPECTED TO CONTINUE SOUTH AND
SOUTHEASTWARD FOR MOST OF THE DAY. THESE TWO MAIN AREAS OF
PRECIPITATION WILL BE EMPHASIZED IN THE FIRST PERIOD.

SUBSIDENCE ASSOCIATED WITH SHORTWAVE RIDGE WILL BEGIN TO BUILD INTO
NORTHWEST PARTS OF THE FORECAST AREA LATE THIS AFTERNOON BUT WITH
THE MODELS INDICATING THE TROUGH AXIS SLOWING DOWN OVER CENTRAL AND
EASTERN OKLAHOMA TONIGHT WILL HOLD ONTO SMALL POPS FOR SOUTHEAST
OKLAHOMA FOR BOTH TONIGHT AND WEDNESDAY.

LITTLE OR NO CHANGES ARE PLANNED BEYOND THURSDAY.

OKC   83  64  85  64 /  90  20  10  10
HBR   86  64  87  66 /  50  10  10  10
SPS   89  66  88  66 /  70  30  10  10
GAG   81  59  85  63 /  60   0  10  10
PNC   82  62  85  61 /  80  10  10  10
DUA   84  66  85  66 /  80  50  20  10

.OUN...
OK...NONE
TX...NONE.
JAMES

In the hours before

Local storm report, Aug 13, 12:29 AM CDT, 3 hours before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
1229 AM CDT TUE AUG 13 2002

TIME (CDT) .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

1140 PM    21 NNE MOORELAND          OK   NON TSTM WIND
08/12/02   WOODWARD                       WIND OCCURRED FROM 2340 TO
                                          2355.

CJS

Local storm report, Aug 13, 1:10 AM CDT, 2 hours 19 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
110 AM CDT TUE AUG 13 2002

TIME (CDT) .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

1205 AM    1 SW MEDFORD              OK   59 MPH WIND GUST
08/13/02   GRANT

1235 AM    4 SSE BLACKWELL           OK   62 MPH WIND GUST
08/13/02   KAY

CJS

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 12, 10:52 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa	38 min
Aug 12, 11:23 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Grant	52 min
Aug 13, 12:09 AM CDT	Severe Thunderstorm Warning	OUN	Major, Woodward	51 min
Aug 13, 12:15 AM CDT	Severe Thunderstorm Warning	OUN	Garfield, Grant, Kay	45 min
Aug 13, 12:50 AM CDT	Severe Thunderstorm Warning	OUN	Noble	40 min
Aug 13, 1:18 AM CDT	Severe Thunderstorm Warning	OUN	Logan, Payne	42 min
Aug 13, 1:43 AM CDT	Severe Thunderstorm Warning	OUN	Kingfisher	47 min
Aug 13, 1:58 AM CDT	Severe Thunderstorm Warning	OUN	Logan	47 min
Aug 13, 2:41 AM CDT	Severe Thunderstorm Warning	OUN	Logan, Oklahoma	49 min
Aug 13, 6:34 AM CDT	Severe Thunderstorm Warning	OUN	Grant	41 min
Aug 13, 7:16 AM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Garfield, Grant, Kay, Major	74 min
Aug 13, 4:16 PM CDT	Severe Thunderstorm Warning	OUN	Pottawatomie	44 min
Aug 13, 4:35 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, Pontotoc	40 min
Aug 13, 4:58 PM CDT	Severe Thunderstorm Warning	OUN	Pottawatomie, Seminole	62 min
Aug 13, 6:12 PM CDT	Severe Thunderstorm Warning	OUN	Garvin	48 min
Aug 13, 6:51 PM CDT	Severe Thunderstorm Warning	OUN	Murray	24 min
Aug 13, 6:10 PM CDT	Severe Thunderstorm Warning	OUN	Archer	50 min
Aug 13, 6:18 PM CDT	Severe Thunderstorm Warning	OUN	Clay	42 min
Aug 13, 6:57 PM CDT	Severe Thunderstorm Warning	OUN	Clay	33 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2002 Every severe thunderstorm warning in 2002

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.