Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 71, NWS Norman, OK

April 13, 2002Woodward County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Apr 13, 2002, 7:01 PM CDT for Woodward County, Oklahoma. It was in force for 29 min. 3 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Apr 13, 2002, 7:01 PM CDT (00:01 UTC)
Expired: Apr 13, 2002, 7:30 PM CDT
In force: 29 min
Issued by: NWS Norman, OK
Area: Counties, with a storm outline in the text

County Woodward County, OK

What was reported inside it

Time	Report	Where
Apr 13, 7:10 PM CDT	Hail 0.75	Woodward, OK
Apr 13, 7:18 PM CDT	Hail 1.25	Woodward, OK
Apr 13, 7:30 PM CDT	Hail 0.75	Woodward, 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.

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

Dodge City, (KDDC), launched 00:00Z, 0.0 hours before the alert went out and 160 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: 303 J/kg
Mixed-layer CIN: -45 J/kg
Mixed-layer LCL: 1554 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 21 m²/s²
0-3 km storm-relative helicity: 80 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WUUS54 KOUN 140001
SVROKC
OKC153-140030-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORMAN OK
700 PM CDT SAT APR 13 2002

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WOODWARD COUNTY IN NORTHWEST OKLAHOMA

* UNTIL 730 PM CDT

* AT 700 PM CDT...DOPPLER RADAR DETECTED A SEVERE THUNDERSTORM OVER
  WOODWARD...MOVING SOUTHEAST AT 15 MPH.

* LOCATIONS IN THE WARNING INCLUDE MOORELAND...SHARON AND WOODWARD

HAIL UP TO THE SIZE OF NICKELS IS LIKELY WITH THIS SEVERE 
THUNDERSTORM.

SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH NO ADVANCE WARNING.
MOVE IMMEDIATELY TO A STORM SHELTER... BASEMENT OR STURDY BUILDING IF
A TORNADO IS SIGHTED.

LAT...LON 3653 9939 3641 9955 3618 9930 3637 9904

30

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 13, 3:48 PM CDT, 3 hours 13 minutes earlier.

Area forecast discussion, Apr 13, 3:48 PM CDT, 3 hours 13 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
348 PM CDT SAT APR 13 2002

AFTN HEATING HAS HAS DESTABILIZED AMS OUT WEST THIS AFTN AS MCS
WHICH MOVED THROUGH THE FA THIS CONTINUES TO WEAKEN AND MOVE SE.
EXPECT CONVECTION TO INCREASE LATE THIS AFTN AND EVENING AND THEN
WORK EWD ACRS MUCH OF THE FA OVERNIGHT. SHEAR AND INSTAB SUFF TO
SUPPORT SEVERE. SOME RESIDUAL ACTIVITY MAY LINGER IN THE SE EARLY IN
THE MORNING. LOOKS LIKE A BREAK IN THE ACTION SUNDAY THROUGH MONDAY
AS S/W RDG BUILDS OVER THE AREA. WILL INTRO POPS FOR MONDAY NIGHT IN
THE WEST AS SYS NOW OVER BAJA GETS EJECTED NEWD INTO THE SRN PLAINS
IN ADVANCE OF DEVELOPING WRN U.S. UPR TROF. WILL CONT POPS INTO
TUESDAY AS THIS WAVE WORKS ITS WAY NEWD ACRS THE FA. PATTERN LOOKS
REL ACTIVE INTO THE EXTENDED PD AND WILL NOT MAKE MUCH CHANGE TO
GOING FCST.

FCSTID = 2
OKC   58  78  61  84 /  60  10   0  10
HBR   57  80  61  86 /  60  10   0  10
SPS   59  82  63  86 /  60  10   0  10
GAG   52  81  58  86 /  40  10   0  10
PNC   55  79  60  85 /  40  10   0  10
DUA   60  78  63  83 /  60  20   0  10

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

In the hours before

Local storm report, Apr 13, 1:12 PM CDT, 5 hours 49 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
112 PM CDT SAT APR 13 2002

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

0820 AM    1 S ODELL                 TX   .75 INCH HAIL
04/13/02   WILBARGER                      SPOTTER REPORT VIA
                                          QUANAH RADIO STATION

KT

Local storm report, Apr 13, 3:09 PM CDT, 3 hours 52 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
309 PM CDT SAT APR 13 2002

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

0730 AM    6 SW GRANDFIELD           OK   3.00 INCH HAIL
04/13/02   TILLMAN                        DAMAGED TO CARS AND
                                          TREES. PUBLIC REPORT

0730 AM    MANGUM                    OK   1.00 INCH HAIL
04/13/02   GREER                          COUNTY SHERIFF REPORT

0800 AM    3 SE DEVOL                OK   1.25 INCH HAIL
04/13/02   COTTON                         PUBLIC REPORT

0820 AM    5 S RANDLETT              OK   1.75 INCH HAIL
04/13/02   COTTON                         PUBLIC REPORT

1030 AM    HOLLIDAY                  TX   WIND DAMAGE
04/13/02   ARCHER                         MOBILE HOME ROOF BLOWN
                                          OFF...POWER LINES AND
                                          TREES DOWN...FOOTBALL
                                          STADIUM LIGHTS DOWNED
                                          COUNTY SHERIFF REPORT

1030 AM    RYAN                      OK   .75 INCH HAIL
04/13/02   JEFFERSON                      PUBLIC REPORT

KT

Local storm report, Apr 13, 6:58 PM CDT, 3 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
658 PM CDT SAT APR 13 2002

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

0655 PM    WOODWARD                  OK   1.00 INCH HAIL
04/13/02   WOODWARD                       EMERGENCY MANAGEMENT

KT

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 13, 7:27 PM CDT	Severe Thunderstorm Warning	OUN	Woodward	48 min
Apr 13, 8:13 PM CDT	Severe Thunderstorm Warning	OUN	Woodward	47 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.