Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 412, NWS Norman, OK

July 28, 2000Noble County, Payne County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jul 28, 2000, 9:31 PM CDT for Noble County, Payne County, Oklahoma. It was in force for 44 min. 2 reports came from inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties, with what was reported inside it.

The facts

Issued: Jul 28, 2000, 9:31 PM CDT (02:31 UTC)
Expired: Jul 28, 2000, 10:15 PM CDT
In force: 44 min
Issued by: NWS Norman, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Noble County, OK, Payne County, OK

The radar

The Norman radar (KTLX), 99 km from the middle of the area, began a volume at 02:30 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
Jul 28, 10:00 PM CDT	Thunderstorm Wind 52 E	Perry, OK
Jul 28, 10:15 PM CDT	Thunderstorm Wind 51 M	Stillwater, OK	Wind was measured by the Oklahoma mesonet.

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
Jul 28, 5:00 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 28, 9:30 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Lamont, OK (KLMN), launched 00:00Z, 2.5 hours before the alert went out and 59 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: 1648 J/kg
Mixed-layer CIN: -22 J/kg
Mixed-layer LCL: 1548 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 28 m²/s²
0-3 km storm-relative helicity: 86 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 3.5

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KOUN 290231
SVROKC
OKC103-119-290315-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORMAN OK
931 PM CDT FRI JUL 28 2000

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  PAYNE COUNTY IN CENTRAL OKLAHOMA
  SOUTHERN NOBLE COUNTY IN NORTHERN OKLAHOMA

* UNTIL 1015 PM CDT

* AT 931 PM CDT...DOPPLER RADAR INDICATED A LARGE SEVERE 
THUNDERSTORM CENTERED ALONG A LINE...EXTENDING FROM 7 MILES 
NORTHWEST OF MORRISON...TO 3 MILES NORTHEAST OF PERRY...TO 7 MILES 
WEST OF PERRY...MOVING SOUTHEAST AT 25 MPH.

* LOCATIONS IN THE WARNING INCLUDE GLENCOE...MORRISON...PERRY...  
RIPLEY...STILLWATER...AND YALE

HAIL UP TO THE SIZE OF GOLFBALLS AND WIND GUSTS TO AT LEAST 60 MPH 
ARE LIKELY.

LAT...LON 3641 9708 3638 9734 3635 9748 3621 9739
          3600 9718 3600 9691 3600 9669 3609 9667
          3622 9691

11

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 28, 9:30 PM CDT, 1 minute earlier.

Area forecast discussion, Jul 28, 9:30 PM CDT, 1 minute before

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE NORMAN OK
930 PM CDT FRI JUL 28 2000

STRONG TO SEVERE THUNDERSTORMS CONTINUE TO DEVELOP ALONG
FRONT/OUTFLOW BOUNDARY IN NORTHERN OKLAHOMA. A FEW SHOWERS AND
THUNDERSTORMS ALSO BEGINNING TO FORM FARTHER SOUTH IN CENTRAL
OKLAHOMA. THE LOW LEVEL CONVERGENCE... ALONG WITH THE TAIL END OF
SHORT WAVE MOVING ACROSS THE AREA... AND PRESENCE OF MODERATE
INSTABILITIES SHOULD HELP ACTIVITY MAINTAIN ITSELF FOR SEVERAL MORE
HOURS.

32

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

In the hours before

Special weather statement, Jul 28, 5:00 PM CDT, 4 hours 31 minutes before

OKZ004>048-050>052-TXZ083>090-290100-

THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
500 PM CDT FRI JUL 28 2000

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS EVENING AND
OVERNIGHT ACROSS PORTIONS OF NORTHERN AND CENTRAL OKLAHOMA. THE
SLIGHT RISK AREA IS ALONG AND NORTH OF A LINE FROM ELK CITY...TO THE
OKLAHOMA METRO AREA...TO STILLWATER.

DISCUSSION...THUNDERSTORMS ARE EXPECTED TO INCREASE IN COVERAGE AND
INTENSITY LATE THIS AFTERNOON AND EARLY EVENING ACROSS SOUTHERN
KANSAS...NEAR A SURFACE FRONTAL BOUNDARY. WITH TIME...THESE STORMS
ARE EXPECTED TO ORGANIZE INTO ONE OR MORE CLUSTERS...AND MOVE SOUTH
INTO THE SOONER STATE. A COMBINATION OF MODERATE NORTHERLY FLOW IN
THE MID LEVELS OF THE ATMOSPHERE AND ADEQUATE INSTABILITY...WILL
SUPPORT THE THREAT OF SEVERE WIND GUSTS AND LARGE HAIL WITH STORMS
THROUGH EARLY EVENING. FROM MID EVENING ON...AS THE STORMS TRY TO
ORGANIZE INTO CLUSTERS...THE MAIN THREAT WILL BE SEVERE WIND
GUSTS...MAINLY ALONG THE LEADING EDGE OF THE STORM CLUSTERS.

EMERGENCY MANAGERS AND STORM SPOTTER GROUPS ACROSS THE SLIGHT RISK
AREA SHOULD BE PREPARED FOR POSSIBLE ACTIVATION THIS EVENING AND
OVERNIGHT.

11

Special weather statement, Jul 28, 5:24 PM CDT, 4 hours 7 minutes before

OKZ004>048-050>052-TXZ083>090-290100-

THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
524 PM CDT FRI JUL 28 2000

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS EVENING AND
OVERNIGHT ACROSS PORTIONS OF NORTHERN AND CENTRAL OKLAHOMA. THE
SLIGHT RISK AREA IS ALONG AND NORTH OF A LINE FROM ELK CITY...TO THE
OKLAHOMA CITY METRO AREA...TO STILLWATER.

DISCUSSION...THUNDERSTORMS ARE EXPECTED TO INCREASE IN COVERAGE AND
INTENSITY LATE THIS AFTERNOON AND EARLY EVENING ACROSS SOUTHERN
KANSAS...NEAR A SURFACE FRONTAL BOUNDARY. WITH TIME...THESE STORMS
ARE EXPECTED TO ORGANIZE INTO ONE OR MORE CLUSTERS...AND MOVE SOUTH
INTO THE SOONER STATE. A COMBINATION OF MODERATE NORTHERLY FLOW IN
THE MID LEVELS OF THE ATMOSPHERE AND ADEQUATE INSTABILITY...WILL
SUPPORT THE THREAT OF SEVERE WIND GUSTS AND LARGE HAIL WITH STORMS
THROUGH EARLY EVENING. FROM MID EVENING ON...AS THE STORMS TRY TO
ORGANIZE INTO CLUSTERS...THE MAIN THREAT WILL BE SEVERE WIND
GUSTS...MAINLY ALONG THE LEADING EDGE OF THE STORM CLUSTERS.

EMERGENCY MANAGERS AND STORM SPOTTER GROUPS ACROSS THE SLIGHT RISK
AREA SHOULD BE PREPARED FOR POSSIBLE ACTIVATION THIS EVENING AND
OVERNIGHT.

11

Local storm report, Jul 28, 8:17 PM CDT, 1 hour 14 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
817 PM CDT FRI JUL 28 2000

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

0805 PM    4 SW MANCHESTER            OK   1.00 INCH HAIL
07/28/00   GRANT/ALFALFA                  REPORTED BY STORM
                                          SPOTTER.

KT

Local storm report, Jul 28, 9:05 PM CDT, 26 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
905 PM CDT FRI JUL 28 2000

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

0855 PM    7 W RED ROCK              OK   1.75 INCH HAIL
07/28/00   NOBLE                          PUBLIC REPORT

0904 PM    8 WSW RED ROCK            OK   1.50 INCH HAIL
07/28/00   NOBLE                          REPORTED2 BY STORM
                                          SPOTTER

KT

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 28, 7:59 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Grant	46 min
Jul 28, 8:32 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa	43 min
Jul 28, 8:37 PM CDT	Severe Thunderstorm Warning	OUN	Noble	53 min
Jul 28, 8:41 PM CDT	Severe Thunderstorm Warning	OUN	Woods	64 min
Jul 28, 9:24 PM CDT	Severe Thunderstorm Warning	OUN	Major	51 min
Jul 28, 9:54 PM CDT	Severe Thunderstorm Warning	OUN	Logan	51 min
Jul 28, 10:15 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Payne	30 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2000 Every severe thunderstorm warning in 2000

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.