Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 303, NWS Norman, OK

June 15, 2002Canadian County, Oklahoma County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jun 15, 2002, 7:51 PM CDT for Canadian County, Oklahoma County, Oklahoma. It was in force for 39 min. 1 report 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: Jun 15, 2002, 7:51 PM CDT (00:51 UTC)
Expired: Jun 15, 2002, 8:30 PM CDT
In force: 39 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), 39 km from the middle of the area, began a volume at 00:55 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
Jun 15, 7:55 PM CDT	Thunderstorm Wind 52 E	Piedmont, 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 watch it was issued in

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

Issued	Product	Office	Lasted
Jun 15, 4:00 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 0.9 hours before the alert went out and 46 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: 368 J/kg
Mixed-layer CIN: -259 J/kg
Mixed-layer LCL: 1599 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 80 m²/s²
0-3 km storm-relative helicity: 235 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KOUN 160051
SVROKC
OKC017-109-160130-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORMAN OK
749 PM CDT SAT JUN 15 2002

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN CANADIAN COUNTY IN CENTRAL OKLAHOMA
  OKLAHOMA COUNTY IN CENTRAL OKLAHOMA

* UNTIL 830 PM CDT

* AT 749 PM CDT...DOPPLER RADAR DETECTED A LINE OF STRONG TO SEVERE 
THUNDERSTORM FROM 19 MILES NORTH OF EDMOND TO 4 MILES NORTH OF 
OKARCHE...MOVING SOUTHEAST AT 45 MPH.  MOST AREAS CAN EXPECT WIND
GUSTS OF 40 TO 50 MPH...HOWEVER A FEW GUSTS NEAR 60 MPH ARE LIKELY
WITH THIS LINE OF STORMS.

* LOCATIONS IN THE WARNING INCLUDE ARCADIA...BETHANY...CHOCTAW...
  CONCHO...DEL CITY...EDMOND...HARRAH...JONES...MIDWEST CITY...
  NICHOLS HILLS...NICOMA PARK...OKARCHE...OKLAHOMA CITY...PIEDMONT...
  SPENCER...THE VILLAGE...TINKER AIR FORCE BASE...WARR ACRES AND
  YUKON

LAT...LON 3572 9719 3574 9765 3573 9807 3539 9788
          3541 9716

SIX

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 Jun 15, 3:46 PM CDT, 4 hours 5 minutes earlier.

Area forecast discussion, Jun 15, 3:46 PM CDT, 4 hours 5 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
346 PM CDT SAT JUN 15 2002

SHOULD BE AN INTERESTING EVENING. QUESTION IS WHERE THE MAIN SHOW
WILL BE...AS ALL MODELS BOLDLY ADVERTIZE MCS DEVELOPING SOMEWHERE
OVER CENTRAL OR S HIGH PLAINS AND ROLLING SE. LEANING MORE TOWARD
THE MORE S AND W TRACK OF THE ETA/NGM...WITH QPF MAX ACROSS SW PARTS
OF THE CWA. NOSE OF UPPER JET MAX...WITH 80-KT SPEED MAX NOW
VICINITY S UT...WILL DIVE SE INTO WC/CENTRAL TX BY LATE TONIGHT.
THIS PLACES SW CWA IN FAVORABLE LEFT EXIT REGION AND STRONG
DIVERGENCE ALOFT. POPS UPPED TO 80PCT OR GREATER AREAWIDE TONIGHT
BASED ON CURRENT RADAR TRENDS OVER KS. S.

MAIN CONCERN TONIGHT IS SEVERE POTENTIAL. SURFACE DEWPOINTS ONLY
EXPECTED TO BE IN LOW 60S...VS L-M 70S EARLIER IN WEEK. THIS STILL
YIELDS CAPES OF 2-3000 J/KG ALONG INSTABILITY AXIS EXPECTED TO LIE
ACROSS PANHANDLES BY LATE AFTERNOON. LL MOISTURE WILL CONTINUE TO
INCREASE INTO THIS EVENING AS SLUG OF GOOD 850 MOISTURE IS PULLED N
INTO AREA. WINDOW OF OPPORTUNITY FOR TORNADIC SUPERCELLS INVOF
SURFACE LOW/TRIPLE POINT THIS EVENING...MAINLY OVER E PANHANDLES BUT
POSSIBLY INCLUDING FAR W CWA. VERY FAVORABLE SHEAR WHERE INCREASING
NW FLOW ALOFT COMES ATOP STRENGTHENING SE LL FLOW AHEAD OF SURFACE
LOW. PROGGED 0-6KM SHEAR OVER 50KT SUGGESTS POSSIBLITY OF A FEW
STRONG/VIOLENT TORNADOES. RISK SHIFTS TO POTENTIAL WIDESPREAD
DAMAGING WINDS LATER THIS EVENING AS MCS DRIVES SE-WARD. LOCALLY
EXCESSIVE RAIN ALSO LIKELY PER HPC GUIDANCE AND AGRESSIVE MODEL
QPFS...BUT WITH DEWPOINTS DOWN FROM EARLIER IN WEEK AND MCS EXPECTED
TO ROLL SE FAIRLY QUICKLY...WILL HOLD OFF ON FF WATCH AT THIS TIME.
NW FLOW PATTERNS TYPICALLY ARE NOT CONDUCIVE TO WIDESPREAD EXCESSIVE
RAINFALL HERE. BUT WE WILL CARRY SEVERE AND HEAVY-RAIN WORDING.

WITH MOST OF OUR ATTENTION FOCUSED ON THE SHOW TONIGHT...WILL NOT
MAKE TOO MANY CHANGES TO LATTER PERIODS OF FORECAST. LOW POPS
CONTINUED SUN NIGHT INTO MON NIGHT UNDER CONTINUING NW FLOW ALOFT.
TUE-SAT DRY WITH TEMPS MODELLED CLOSELY TO MEX/HPC NUMBERS.

FCSTID = 24
OKC   62  81  62  83 /  90  20  20  30
HBR   61  86  61  84 /  90  10  30  30
SPS   63  81  62  83 /  90  40  20  30
GAG   59  85  60  85 /  90  10  30  30
PNC   61  83  61  85 /  90  10  20  30
DUA   61  78  62  81 /  80  70  20  30

.OUN...
OK...SEVERE THUNDERSTORM WATCH FROM 400 PM CDT SATURDAY UNTIL 1000
PM CDT SATURDAY FOR ZONES
OKZ006...OKZ021...OKZ017...OKZ023>024...OKZ029...OKZ016...OKZ015...OK
Z009...OKZ012...OKZ027...OKZ007...OKZ004...OKZ008...OKZ018...OKZ026..
.OKZ019...OKZ028...OKZ011...OKZ013...OKZ025...OKZ020...OKZ030...OKZ01
4...OKZ031...OKZ022...OKZ005...OKZ010.

TX...NONE.

In the hours before

Local storm report, Jun 15, 6:21 PM CDT, 1 hour 30 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
621 PM CDT SAT JUN 15 2002

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

0546 PM    4 NW CAPRON               OK   70 MPH WIND GUST
06/15/02   WOODS                          ESTIMATED BY PUBLIC.
                                          ALSO 2 TO 3 INCH TREE
                                          LIMBS BROKEN.

0610 PM    8 E BYRON                 OK   80 MPH WIND GUST
06/15/02   ALFALFA                        ESTIMATED BY PUBLIC.

KT

Local storm report, Jun 15, 6:36 PM CDT, 1 hour 15 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
636 PM CDT SAT JUN 15 2002

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

0605 PM    7 SW ALVA                 OK   64 MPH WIND GUST
06/15/02   WOODS                          MEASURED BY MESONET

0610 PM    7 SW ALVA                 OK   63 MPH WIND GUST
06/15/02   WOODS                          MEASURED BY MESONET

0615 PM    1 SW CHEROKEE             OK   58 MPH WIND GUST
06/15/02   ALFALFA                        MEASURED BY MESONET

KT

Local storm report, Jun 15, 7:01 PM CDT, 50 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
701 PM CDT SAT JUN 15 2002

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

0640 PM    3 NW CARRIER              OK   60 MPH WIND GUST
06/15/02   GARFIELD                       ESTIMATED BY PUBLIC.
                                          ALSO 2 INCH TREE LIMBS
                                          DOWN.

0645 PM    5 N MENO                  OK   60 MPH WIND GUST
06/15/02   MAJOR                          ESTIMATED BY PUBLIC.

KT

Local storm report, Jun 15, 7:09 PM CDT, 42 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
709 PM CDT SAT JUN 15 2002

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

0700 PM    ENID                      OK   70 MPH WIND GUST
06/15/02   GARFIELD                       ESTIMATED GUST. REPORTED
                                          BY COUNTY SHERIFFS OFFICE.

KT

Local storm report, Jun 15, 7:25 PM CDT, 26 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
725 PM CDT SAT JUN 15 2002

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

0717 PM    1 S BISON                 OK   60 MPH WIND GUST
06/15/02   GARFIELD                       ESTIMATED BY AMATEUR
                                          RADIO OPERATOR.

0717 PM    3 N HENNESSEY             OK   60 MPH WIND GUST
06/15/02   KINGFISHER                     ESTIMATED BY AMATEUR
                                          RADIO OPERATOR.

KT

Local storm report, Jun 15, 7:34 PM CDT, 17 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
734 PM CDT SAT JUN 15 2002

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

0733 PM    MARSHALL                  OK   60 MPH WIND GUST
06/15/02   LOGAN                          ESTIMATED BY NWS COOP
                                          OBSERVER.

KT

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 15, 7:07 PM CDT	Severe Thunderstorm Warning	OUN	Dewey	38 min
Jun 15, 7:15 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Kingfisher, Logan, Noble	45 min
Jun 15, 7:26 PM CDT	Severe Thunderstorm Warning	OUN	Custer	64 min
Jun 15, 7:32 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Roger Mills	58 min
Jun 15, 8:03 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Washita	57 min
Jun 15, 8:15 PM CDT	Severe Thunderstorm Warning	OUN	Blaine	30 min
Jun 15, 8:19 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Harmon, Kiowa	56 min
Jun 15, 8:28 PM CDT	Severe Thunderstorm Warning	OUN	Beckham	32 min
Jun 15, 8:56 PM CDT	Severe Thunderstorm Warning	OUN	Jackson	64 min
Jun 15, 9:01 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Grady	59 min
Jun 15, 9:11 PM CDT	Severe Thunderstorm Warning	OUN	Tillman	64 min
Jun 15, 9:14 PM CDT	Severe Thunderstorm Warning	OUN	Kiowa	31 min
Jun 15, 9:38 PM CDT	Severe Thunderstorm Warning	OUN	Cotton, Stephens	52 min
Jun 15, 10:04 PM CDT	Severe Thunderstorm Warning	OUN	Jefferson	56 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.