Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 348, NWS Norman, OK

July 24, 2002Seminole County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jul 24, 2002, 5:15 PM CDT for Seminole County, Oklahoma. It was in force for 45 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 24, 2002, 5:15 PM CDT (22:15 UTC)
Expired: Jul 24, 2002, 6:00 PM CDT
In force: 45 min
Issued by: NWS Norman, OK
Area: Counties, with a storm outline in the text

County Seminole County, OK

The radar

The Norman radar (KTLX), 64 km from the middle of the area, began a volume at 22:19 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

Norman, OK (KOUN), launched 12:00Z, 10.3 hours before the alert went out and 73 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: 2839 J/kg
Mixed-layer CIN: -55 J/kg
Mixed-layer LCL: 1040 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 81 m²/s²
0-3 km storm-relative helicity: 140 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

888 
WUUS54 KOUN 242215
SVROKC
OKC133-242300-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORMAN OK
515 PM CDT WED JUL 24 2002

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SEMINOLE COUNTY IN EAST CENTRAL OKLAHOMA

* UNTIL 600 PM CDT

* AT 515 PM CDT...DOPPLER RADAR DETECTED A SEVERE THUNDERSTORM 3
  MILES EAST OF BOWLEGS...MOVING SOUTHEAST AT 10 MPH.

* LOCATIONS IN THE WARNING INCLUDE BOWLEGS...SEMINOLE AND WEWOKA

WIND GUSTS TO 65 MPH ARE LIKELY WITH THIS SEVERE THUNDERSTORM.

LAT...LON 3526 9665 3511 9676 3493 9651 3521 9645
JAMES

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 Jul 24, 2:31 PM CDT, 2 hours 44 minutes earlier.

Area forecast discussion, Jul 24, 2:31 PM CDT, 2 hours 44 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
231 PM CDT WED JUL 24 2002

SCATTERED THUNDERSTORMS HAVE CRANKED UP THIS AFTERNOON OVER A
LOW-LEVEL CONVERGENCE ZONE ACROSS THE CENTRAL/SOUTHWEST PART OF OUR
FORECAST AREA.  THE POSITION AND COVERAGE OF THE STORMS AT ZONE
ISSUANCE TIME WILL DICTATE TO A GREAT DEGREE THE FINAL ARRANGEMENT
OF POPS FOR TONIGHT.  AT THIS TIME... THE PLAN IS TO HAVE SCATTERED
THUNDERSTORMS REMAINING IN THE GENERAL REGION OF THE CONVERGENCE
ZONE... WITH DECREASING POPS FARTHER AWAY FROM IT.  BY THE TIME THE
ZONES TAKE EFFECT... COVERAGE SHOULD BE ON THE ORDER OF 30 TO 40
PERCENT OR LESS.  HOWEVER... WE WILL RESERVE THE RIGHT TO MAKE
SIGNIFICANT CHANGES TO THE POPS SHOWN BELOW.

ONCE THIS CONVECTION IS OVER... THINGS LOOK RATHER DRY.  THE UPPER
RIDGE TAKES STRONGER EFFECT FROM TOMORROW ONWARD AND SHOULD RESULT
IN VERY LOW OR NIL POPS AND WARMER TEMPERATURES.  THE MAV GUIDANCE
LOOKS REASONABLE... ALTHOUGH PERHAPS A COUPLE DEGREES TOO COOL.  FOR
NOW... WILL RAISE TEMPERATURES BY A HAIR OR TWO... WHICH PUTS THEM
GENERALLY EVEN WITH MAV.

THERE MAY BE ANOTHER CHANCE OF RAIN TUESDAY OR WEDNESDAY OF NEXT
WEEK.  MEDIUM-RANGE GUIDANCE SUGGESTS THAT A BOUNDARY FROM THE NORTH
WILL GET JUST CLOSE ENOUGH TO ALLOW SOME STORMS TO APPROACH THE
FORECAST AREA... OR FOR SCATTERED STORMS TO FORM IN MOIST GULF FLOW
UNDER A LESS-SUBSTANTIAL UPPER HIGH.  EITHER WAY... 20 PERCENT POPS
SEEMS APPROPRIATE.  THE POPS WE HAD FOR MONDAY WERE REMOVED SINCE
THE ARRIVAL OF THE PRO-RAIN FEATURES WILL LIKELY BE DELAYED UNTIL AT
LEAST TUESDAY.

FCSTID = 23 = CMS

OKC   72  96  73  97 /  30   0   0  10
HBR   72  99  73  99 /  20  10  10  10
SPS   73 100  74 100 /  20  10  10  10
GAG   68  97  70  98 /  20   0  10  10
PNC   71  97  73  97 /  10   0  10  10
DUA   73  96  74  97 /  30  10  10  10

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

In the hours before

Special weather statement, Jul 24, 1:55 PM CDT, 3 hours 20 minutes before

OKZ004>048-050>052-TXZ083>090-242200-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
155 PM CDT WED JUL 24 2002

THUNDERSTORM OUTLOOK...
WIDELY SCATTERED THUNDERSTORMS WILL CONTINUE TO DEVELOP
ACROSS PARTS OF WESTERN...CENTRAL AND SOUTHERN OKLAHOMA
THIS AFTERNOON.  SOME OF THESE STORMS MAY PRODUCE STRONG
DAMAGING WINDS.

DISCUSSION...
WIDELY SCATTERED THUNDERSTORMS HAVE DEVELOPED ALONG A SURFACE
BOUNDARY WHICH EXTENDS FROM NORTHWEST OKLAHOMA SOUTHEAST
INTO CENTRAL AND SOUTHERN OKLAHOMA.  MODERATE TO STRONG
INSTABILITY IS PRESENT ACROSS THIS AREA AS TEMPERATURES
HAVE WARMED INTO THE LOWER AND MID 90S.  FAIRLY WEAK WINDS ALOFT
WILL RESULT IN PULSE SEVERE TYPE STORMS WITH HAIL TO THE SIZE
OF PENNIES AND WIND GUSTS OVER 65 MPH.  THUNDERSTORM INTENSITY
WILL WEAKEN THIS EVENING WITH THE LOSS OF HEATING.  VERY
HEAVY RAINFALL WITH THE STRONGER STORMS WILL CAUSE PONDING
OF WATER ON ROADWAYS.

PROBABILITY TABLE...
VALID THROUGH 700 AM CDT TUE JUL 25.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
              NWS NORMAN COUNTY WARNING AREA...100 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...50 PERCENT.

OTHER HAZARDOUS WEATHER...
NO OTHER HAZARDOUS WEATHER IS EXPECTED TODAY OR TONIGHT.

THE NEXT SCHEDULED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED AT 7 AM
THURSDAY.

SIX

Local storm report, Jul 24, 2:36 PM CDT, 2 hours 39 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
236 PM CDT WED JUL 24 2002

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

0230 PM    YUKON                     OK   ESTIMATED 65 MPH WIND GUST
07/24/02   CANADIAN                       REPORTED BY LAW ENFORCEMENT.

TY

Local storm report, Jul 24, 3:11 PM CDT, 2 hours 4 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
311 PM CDT WED JUL 24 2002

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

0310 PM    OKLAHOMA CITY             OK   60 MPH WIND GUST
07/24/02   OKLAHOMA                        EST BY HAM SPOTTER
                                           AT BAPTIST HOSP.

0310 PM    OKLAHOMA CITY             OK   .75 INCH HAIL
07/24/02   OKLAHOMA                        REPORTED BY
                                           OKLAHOMA COUNTY
                                           EM

Local storm report, Jul 24, 3:20 PM CDT, 1 hour 55 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
320 PM CDT WED JUL 24 2002

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

0305 PM    TUTTLE                    OK   ESTIMATED 60 MPH WIND GUST
07/24/02   GRADY                          REPORTED BY TUTTLE EM.

TY

Local storm report, Jul 24, 4:22 PM CDT, 53 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
422 PM CDT WED JUL 24 2002

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

0335 PM    NEWCASTLE                 OK   65 MPH WIND GUST
07/24/02   MCCLAIN                        EST BY OFF DUTY
                                          NWS FORECASTER

Local storm report, Jul 24, 4:40 PM CDT, 35 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
440 PM CDT WED JUL 24 2002

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

0435 PM    1 S DALE                  OK   .75 INCH HAIL
07/24/02   POTTAWATOMIE                    REPORTED BY
                                           SHAWNEE EOC

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 24, 2:02 PM CDT	Severe Thunderstorm Warning	OUN	Canadian	58 min
Jul 24, 2:41 PM CDT	Severe Thunderstorm Warning	OUN	Grady	64 min
Jul 24, 2:48 PM CDT	Severe Thunderstorm Warning	OUN	Oklahoma	57 min
Jul 24, 3:01 PM CDT	Severe Thunderstorm Warning	OUN	Canadian	29 min
Jul 24, 3:32 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, McClain	58 min
Jul 24, 4:00 PM CDT	Severe Thunderstorm Warning	OUN	Blaine	60 min
Jul 24, 4:23 PM CDT	Severe Thunderstorm Warning	OUN	Pottawatomie	67 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.