Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 105, NWS Norman, OK

April 17, 2002Roger Mills County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Apr 17, 2002, 9:26 PM CDT for Roger Mills County, Oklahoma. It was in force for 49 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: Apr 17, 2002, 9:26 PM CDT (02:26 UTC)
Expired: Apr 17, 2002, 10:15 PM CDT
In force: 49 min
Issued by: NWS Norman, OK
Area: Counties, with a storm outline in the text

County Roger Mills County, OK

The radar

The Altus AFB radar (KFDR), 161 km from the middle of the area, began a volume at 02:26 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
Apr 17, 9:30 PM CDT	Hail 0.75	Angora, OK

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
Apr 17, 6:00 PM CDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 00:00Z, 2.4 hours before the alert went out and 189 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: 53 J/kg
Mixed-layer CIN: -53 J/kg
Mixed-layer LCL: 3565 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 33 m²/s²
0-3 km storm-relative helicity: 63 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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 Apr 17, 9:04 PM CDT, 22 minutes earlier.

Area forecast discussion, Apr 17, 9:04 PM CDT, 22 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
904 PM CDT WED APR 17 2002

SVR WX EVENT ONGOING ACROSS MUCH OF THE WESTERN THIRD OF THE FA
ATTM. MAIN QUESTION FOR THE OVERNITE PERIOD IS WHAT THE EVOLUTION OF
THIS CONVECTION WILL BE.  NUMEROUS DISCREET AND SPLITTING
STORMS/SUPERCELLS CONTINUE ALONG AND EAST OF THE SFC DRYLINE ATTM..
BUT THERE SEEMS TO BE SOME TENDENCY TOWARD STORMS MERGING AND THE
LINE FILLING IN A BIT IN THE PAST HALF HOUR OR SO.  CURRENT THINKING
IS THAT STORMS WILL CONTINUE FOR AT LEAST SEVERAL MORE HOURS AS
INSTABILITY WILL BE SLOW TO DIMINISH WITH WINDS/CLOUD COVER.  SOME
OF THESE STORMS MAY ALSO TRY TO CONGEAL INTO A SMALL MCS AFFECTING
PARTS OF WRN/NRN OK UNTIL AFTER MIDNITE.  BY LATE TONITE HOWEVER..
THE FOCUS FOR CONVECTION SHUD BEGIN TO CONSOLIDATE WELL NORTH OF THE
SRN PLAINS AT THE NOSE OF INTENSE LLJ FORECAST TO DEVELOP BY ALL
SHORT RANGE GUIDANCE. THE GOING FORECAST HAS A FAIRLY GOOD HANDLE ON
THIS SCENARIO..BUT WILL NEED TO MAKE A FEW MINOR ADJUSTMENTS TO POPS
AND SKY COVER.  UPDATED ISC GRIDS WERE SENT ABOUT AN HOUR AGO.. ZFP
SHUD BE OUT WITHIN THE HOUR.
 MILLER

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

In the hours before

Local storm report, Apr 17, 7:55 PM CDT, 1 hour 31 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
755 PM CDT WED APR 17 2002

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

0751 PM    1 N CESTOS                OK   .75 INCH HAIL
04/17/02   DEWEY                          REPORTED BY SPOTTER

Local storm report, Apr 17, 8:26 PM CDT, 1 hour before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
826 PM CDT WED APR 17 2002

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

0745 PM    1 W CHEYENNE              OK   .75 INCH HAIL
04/17/02   ROGER MILLS                    REPORTED BY PUBLIC

Local storm report, Apr 17, 8:49 PM CDT, 37 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
849 PM CDT WED APR 17 2002

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

0805 PM    3 ESE MAYFIELD            OK   1.00 INCH HAIL
04/17/02   BECKHAM                        REPORTED BY PUBLIC

Local storm report, Apr 17, 9:11 PM CDT, 15 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
911 PM CDT WED APR 17 2002

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

0800 PM    1 N ERICK                 OK   1.50 INCH HAIL
04/17/02   BECKHAM                        REPORTED BY COOP OBSERVER

Local storm report, Apr 17, 9:18 PM CDT, 8 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
918 PM CDT WED APR 17 2002

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

0917 PM    1 S SAYRE                 OK   1.00 INCH HAIL
04/17/02   BECKHAM                        REPORTED BY AMATUER RADIO

0919 PM    2 S SAYRE                 OK   1.75 INCH HAIL
04/17/02   BECKHAM                        REPORTED BY AMATUER RADIO

Local storm report, Apr 17, 9:23 PM CDT, 3 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
923 PM CDT WED APR 17 2002

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

0922 PM    SAYRE                     OK   1.75 INCH HAIL
04/17/02   BECKHAM                        REPORTED BY COUNTY EM

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 17, 7:01 PM CDT	Severe Thunderstorm Warning	OUN	Dewey	44 min
Apr 17, 7:13 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Roger Mills	47 min
Apr 17, 7:48 PM CDT	Tornado Warning	OUN	Dewey	27 min
Apr 17, 7:50 PM CDT	Tornado Warning	OUN	Beckham	40 min
Apr 17, 7:53 PM CDT	Severe Thunderstorm Warning	OUN	Woodward	37 min
Apr 17, 7:58 PM CDT	Severe Thunderstorm Warning	OUN	Roger Mills	47 min
Apr 17, 7:59 PM CDT	Severe Thunderstorm Warning	OUN	Major	46 min
Apr 17, 8:03 PM CDT	Severe Thunderstorm Warning	OUN	Harmon	27 min
Apr 17, 8:18 PM CDT	Severe Thunderstorm Warning	OUN	Dewey	42 min
Apr 17, 8:29 PM CDT	Severe Thunderstorm Warning	OUN	Woodward	46 min
Apr 17, 8:29 PM CDT	Severe Thunderstorm Warning	OUN	Beckham	61 min
Apr 17, 8:47 PM CDT	Severe Thunderstorm Warning	OUN	Major, Roger Mills, Woods	43 min
Apr 17, 8:55 PM CDT	Severe Thunderstorm Warning	OUN	Harmon	50 min
Apr 17, 9:10 PM CDT	Tornado Warning	OUN	Beckham	35 min
Apr 17, 9:43 PM CDT	Severe Thunderstorm Warning	OUN	Dewey	47 min
Apr 17, 9:43 PM CDT	Tornado Warning	OUN	Beckham	32 min
Apr 17, 9:53 PM CDT	Tornado Warning	OUN	Washita	37 min
Apr 17, 10:00 PM CDT	Severe Thunderstorm Warning	OUN	Custer	60 min
Apr 17, 10:19 PM CDT	Tornado Warning	OUN	Custer	41 min
Apr 17, 11:17 PM CDT	Severe Thunderstorm Warning	OUN	Dewey	28 min
Apr 17, 11:30 PM CDT	Severe Thunderstorm Warning	OUN	Major, Woods, Woodward	45 min
Apr 17, 11:53 PM CDT	Tornado Warning	OUN	Major	37 min
Apr 18, 12:28 AM CDT	Tornado Warning	OUN	Major, Woods	32 min
Apr 18, 12:51 AM CDT	Tornado Warning	OUN	Alfalfa, Woods	39 min
Apr 18, 1:22 AM CDT	Severe Thunderstorm Warning	OUN	Grant	38 min
Apr 18, 1:26 AM CDT	Tornado Warning	OUN	Alfalfa	34 min
Apr 18, 1:57 AM CDT	Tornado Warning	OUN	Alfalfa, Grant	33 min
Apr 17, 9:01 PM CDT	Severe Thunderstorm Warning	OUN	Foard, Knox	59 min
Apr 17, 10:24 PM CDT	Severe Thunderstorm Warning	OUN	Hardeman	66 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.