Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 252, NWS Tulsa, OK

August 23, 2002Craig County, Nowata County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Aug 23, 2002, 6:20 PM CDT for Craig County, Nowata County, Oklahoma. It was in force for 40 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 23, 2002, 6:20 PM CDT (23:20 UTC)
Expired: Aug 23, 2002, 7:00 PM CDT
In force: 40 min
Issued by: NWS Tulsa, OK
Area: Counties, with a storm outline in the text

Counties Craig County, OK, Nowata County, OK

The radar

The Tulsa radar (KINX), 69 km from the middle of the area, began a volume at 23:24 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 11.3 hours before the alert went out and 144 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: 1231 J/kg
Mixed-layer CIN: -116 J/kg
Mixed-layer LCL: 1240 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 45 m²/s²
0-3 km storm-relative helicity: 135 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Tulsa, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 23, 3:00 PM CDT, 3 hours 20 minutes earlier.

Area forecast discussion, Aug 23, 3:00 PM CDT, 3 hours 20 minutes before

EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OKLAHOMA
300 PM CDT FRI AUG 23 2002

HAVE SEEN SOME SCATTERED CONVECTION DEVELOP MAINLY OVER EASTERN
SECTIONS OF THE AREA THIS AFTERNOON.  THIS ACTIVITY IS GENERALLY
DIURNALLY DRIVEN...SO SHOULD QUICKLY DIMINISH BY EARLY EVENING.
FOCUS WILL THEN BE NORTHWEST OF THE AREA ONCE AGAIN AS A COMPLEX OF
STORMS EXPECTED TO DEVELOP LATER TONIGHT.  BELIEVE THIS ACTIVITY
WILL DEVELOP FAR ENOUGH TO THE NORTHWEST...AND HAVE MORE OF AN
EASTERLY MOVEMENT DURING THE NIGHT THUS REMAINING GENERALLY TO OUR
NORTH AT LEAST THROUGH 12Z.  HOWEVER...AM RELUCTANT TO REMOVE POPS
FOR LATER TONIGHT AT THIS POINT...SO SLIGHT CHANCES WILL BE LEFT IN
PLACE.

BELIEVE BEST CHANCE FOR PRECIP OVER THE AREA WILL BE SATURDAY AND
ESPECIALLY SATURDAY NIGHT AS FLOW ALOFT TURNS MORE NORTHWESTERLY.
HIGHEST POPS WILL BE ACROSS NORTHEAST OKLAHOMA INTO NORTHWEST
ARKANSAS BY LATER TOMORROW AFTERNOON INTO TOMORROW NIGHT...THEN
TAPERING DOWNWARD OVER SOUTHEAST OKLAHOMA TOWARD THE RED RIVER.
WILL KEEP CHANCE POPS OVER THE AREA SUNDAY...AND SLIGHT CHANCE
SUNDAY NIGHT.

FOR THE EXTENDED PART OF THE FORECAST WILL KEEP MONDAY AND TUESDAY
DRY...THEN HAVE ADDED A MENTION OF SHOWERS AND THUNDERSTORMS FOR
WEDNESDAY/THURSDAY.

TUL  77  93  71  92 /  20  40  50  30
FSM  73  96  73  92 /  20  30  50  30
MLC  73  96  73  93 /  20  30  40  30
BVO  73  90  69  91 /  20  40  50  30
FYV  68  91  68  90 /  20  30  50  30
BYV  69  90  67  87 /  20  30  50  30
MIO  70  89  66  90 /  20  30  50  30
MKO  73  94  71  92 /  20  30  50  30
F10  73  94  72  93 /  20  30  40  30
HHW  74  98  75  94 /  20  20  30  30

FORECAST ID= 4
.TSA...
AR...NONE.
OK...NONE.

In the hours before

Local storm report, Aug 23, 5:58 PM CDT, 22 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
558 PM CDT FRI AUG 23 2002

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

0510 PM    2 NE MIAMI                OK   58 MPH TSTM WIND GUST
08/23/02   OTTAWA                         REPORT FROM MESONET
                                          STATION.

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 23, 4:45 PM CDT	Severe Thunderstorm Warning	TSA	Ottawa	45 min
Aug 23, 5:43 PM CDT	Severe Thunderstorm Warning	TSA	Ottawa	62 min
Aug 23, 6:21 PM CDT	Flash Flood Warning	TSA	Ottawa	3 hr
Aug 23, 6:47 PM CDT	Severe Thunderstorm Warning	TSA	Washington	43 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.