Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 358, NWS Norman, OK

July 21, 2000Major County, Woodward County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jul 21, 2000, 12:50 AM CDT for Major County, Woodward County, Oklahoma. It was in force for 35 min. No storm report in the archive falls 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.

The facts

Issued
Jul 21, 2000, 12:50 AM CDT (05:50 UTC)
Expired
Jul 21, 2000, 1:25 AM CDT
In force
35 min
Issued by
NWS Norman, OK
Area
Whole counties; the outline is the Mesonet’s reconstruction

Counties Major County, OK, Woodward County, OK

The watch it was issued in

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

IssuedProductOfficeLasted
Jul 20, 11:45 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Dodge City, (KDDC), launched 00:00Z, 5.8 hours before the alert went out and 164 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-pSkew-T log-p diagram, Dodge City, at 00:00Z on 2000-07-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2430 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Dodge City, at 00:00Z on 2000-07-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 196 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
2430 J/kg
Mixed-layer CIN
-117 J/kg
Mixed-layer LCL
1215 m above ground
0-6 km bulk shear
56 kt
0-1 km storm-relative helicity
196 m²/s²
0-3 km storm-relative helicity
531 m²/s²
Significant tornado parameter
3.8
Supercell composite
54.8

Open this sounding in Storm Lab

The text

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

145 
WUUS54 KOUN 210551
SVROKC
OKC093-153-210625-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORMAN OK
1250 AM CDT FRI JUL 21 2000

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

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

* UNTIL 125 AM CDT

* AT 1250 AM CDT...DOPPLER RADAR INDICATED SEVERE THUNDERSTORMS
  ALONG A LINE EXTENDING FROM 10 MILES EAST OF ALABASTER CAVERNS   
  STATE PARK TO 4 MILES NORTHEAST OF QUINLAN TO 5 MILES NORTHWEST    
  OF MUTUAL...MOVING SOUTHEAST AT 45 MPH.

* LOCATIONS IN THE WARNING INCLUDE ALABASTER CAVERNS STATE PARK...
  CHESTER...MOORELAND...MUTUAL...ORION...QUINLAN AND SHARON

WIND GUSTS TO AT LEAST 60 MPH ARE LIKELY. DAMAGING WINDS MAY OCUR 
WELL IN ADVANCE OF THE PRECIPITATION WITH THESE STORMS.

LAT...LON 3676 9919 3653 9930 3620 9955 3617 9855
          3630 9850 3652 9899
 MILLER

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 20, 9:39 PM CDT, 3 hours 11 minutes earlier.

Area forecast discussion, Jul 20, 9:39 PM CDT, 3 hours 11 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
939 PM CDT THU JUL 20 2000

PARAMETERS FOR A NOCTURNAL WIND EVENT APPEAR TO BE COMING TOGETHER
FOR PORTIONS OF THE FORECAST AREA LATER TONITE.  EVENING SFC ANALYS
IS SHOWING A MULTITUDE OF LEFT OVER OUTFLOW BOUNDARIES LEFT OVER
FROM LAST NITE/S AND TODAY/S CONVECTIVE ACTIVITY.  THE MOST
IMPORTANT OF SAID BOUNDARIES APPEARS TO LIE ROUGHLY ALONG THE
GAGE/WATONGA/OKLAHOMA CITY/ADA CORRIDOR WITH A STRONG 850 MB
BAROCLINIC ZONE ALONG AND JUST NORTH OF THE SFC BOUNDARY. STRONG TO
SEVERE CONVECTION IS ALREADY ONGOING STRONG ACROSS MUCH OF CENTRAL
AND WESTERN KS ATTM..ABOUT 3 HOURS EARLIER THAN LAST EVENING. RATHER
IMPRESSIVE 300 MB JET ENTRANCE REGION FOR JULY OVER KS WILL LIKELY
ENHANCE SRLY LLJ..AND EXPECT THIS ACTIVITY WILL BUILD SEWD INTO THE
DEVELOPING LLJ AXIS OVERNIGHT ALONG AND JUST NORTH OF THE
AFOREMENTIONED SFC BOUNDARY LYING NW TO SE ACROSS THE AREA.  MCS
WILL LIKELY BE ACCOMPANIED BY SVR WIND GUSTS AND POSSIBLY SOME HAIL
WITH THE STRONGEST STORMS..ESP OVER NRN OK. THIS IS SUPPORTED BY
EVIDENCE OF A DEVELOPING LOW LEVEL COLD POOL WITH MCS ATTM..AND
CONVECTION SLOWLY BECOMING ORIENTED PERPENDICULAR TO THE MID LEVEL
FLOW.

OTHER QUESTION IS HOW FAR SOUTH TO BRING THE MCS TOMORROW MORNING.
LATEST MCS PROPAGATION VECTOR FORECASTS FROM THE 00Z RUC WUD SUGGEST
THAT THE MCS WILL OBTAIN A GOOD SRLY DEVELOPMENT COMPONENT AFTER
MIDNIGHT..SO CARRYING POPS INTO SRN OK FRIDAY MORNING LOOKS GOOD.
HEAVY RAINFALL EVENT MAY SET UP INVOF RESIDUAL OUTFLOW BOUNDARY AS
STRONG 850 MB WAA/THETA ADVECTION PERSIST THRU THE MORNING.

UPDATED ZONES WERE ISSUED ABOUT AN HOUR AGO TO REFLECT THE ABOVE
THINKING.
 MILLER

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

In the hours before

Special weather statement, Jul 20, 11:37 PM CDT, 1 hour 13 minutes before
OKZ004>048-050>052-TXZ083>090-210600-

THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
1137 PM CDT THU JUL 20 2000

THERE IS A MODERATE RISK OF SEVERE THUNDERSTORMS OVERNIGHT TONIGHT
ACROSS MUCH OF NORTHERN OKLAHOMA...GENERALLY NORTH OF A LINE FROM
GAGE...TO WATONGA...TO OKLAHOMA CITY...TO SEMINOLE. THERE IS A
SLIGHT RISK OF SEVERE THUNDERSTORMS OVERNIGHT NORTH OF A LINE FROM
CHEYENNE TO ADA.

DISCUSSION...A LARGE COMPLEX OF SEVERE THUNDERSTORMS OVER SOUTHERN
KANSAS WILL MOVE RAPIDLY SOUTHEAST ACROSS MUCH OF NORTHERN OKLAHOMA
OVERNIGHT. THE PRIMARY THREAT FROM THESE THUNDERSTORMS WILL BE
DAMAGING WIND GUSTS FROM 60 TO 90 MPH.  A FEW REPORTS OF HAIL UP TO
THE SIZE OF QUARTERS ARE ALSO EXPECTED.

WIND SHEAR PARAMETERS ARE ALSO SUPPORTIVE OF SUPERCELLS...AND A FEW
SUPERCELLS MAY DEVELOP WITHIN THE LINE OF STORMS OR AHEAD OF IT.
THE POSSIBILITY OF A TORNADO OR TWO CANNOT BE RULED WITH ANY
SUPERCELLS THAT ARE ABLE TO DEVELOP.

EMERGENCY MANAGER AND STORM SPOTTER GROUP ACTIVATION WILL BE REQUIRED
ACROSS THE NORTHERN HALF OF OKLAHOMA OVERNIGHT.

 MILLER
Special weather statement, Jul 20, 11:37 PM CDT, 1 hour 13 minutes before
OKZ004>048-050>052-TXZ083>090-210600-

THUNDERSTORM OUTLOOK...UPDATED..
NATIONAL WEATHER SERVICE NORMAN OK
1137 PM CDT THU JUL 20 2000

THERE IS A MODERATE RISK OF SEVERE THUNDERSTORMS OVERNIGHT TONIGHT
ACROSS MUCH OF NORTHERN OKLAHOMA...GENERALLY NORTH OF A LINE FROM
GAGE...TO WATONGA...TO OKLAHOMA CITY...TO SEMINOLE. THERE IS A
SLIGHT RISK OF SEVERE THUNDERSTORMS OVERNIGHT NORTH OF A LINE FROM
CHEYENNE TO ADA.

DISCUSSION...A LARGE COMPLEX OF SEVERE THUNDERSTORMS OVER SOUTHERN
KANSAS WILL MOVE RAPIDLY SOUTHEAST ACROSS MUCH OF NORTHERN OKLAHOMA
OVERNIGHT. THE PRIMARY THREAT FROM THESE THUNDERSTORMS WILL BE
DAMAGING WIND GUSTS FROM 60 TO 90 MPH.  A FEW REPORTS OF HAIL UP TO
THE SIZE OF QUARTERS ARE ALSO EXPECTED.

WIND SHEAR PARAMETERS ARE ALSO SUPPORTIVE OF SUPERCELLS...AND A FEW
SUPERCELLS MAY DEVELOP WITHIN THE LINE OF STORMS OR AHEAD OF IT.
THE POSSIBILITY OF A TORNADO OR TWO CANNOT BE RULED OUT WITH ANY
SUPERCELLS THAT ARE ABLE TO DEVELOP.

EMERGENCY MANAGER AND STORM SPOTTER GROUP ACTIVATION WILL BE REQUIRED
ACROSS THE NORTHERN HALF OF OKLAHOMA OVERNIGHT.

 MILLER
Local storm report, Jul 21, 12:27 AM CDT, 23 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
1227 AM CDT FRI JUL 21 2000

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

1155 PM    1 SW BUFFALO              OK   60 MPH WIND GUST
07/20/00   HARPER                         BY MESONET

CW
Local storm report, Jul 21, 12:31 AM CDT, 19 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
1231 AM CDT FRI JUL 21 2000

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

1205 AM    1i SW BUFFALO              OK   62 MPH WIND GUST
07/21/00   HARPER                         BY MESONET

CW

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 20, 11:15 PM CDTSevere Thunderstorm WarningOUNHarper45 min
Jul 20, 11:42 PM CDTSevere Thunderstorm WarningOUNEllis18 min
Jul 21, 12:02 AM CDTSevere Thunderstorm WarningOUNHarper, Woods, Woodward43 min
Jul 21, 12:02 AM CDTSevere Thunderstorm WarningOUNEllis43 min
Jul 21, 12:10 AM CDTSevere Thunderstorm WarningOUNGrant50 min
Jul 21, 12:32 AM CDTSevere Thunderstorm WarningOUNAlfalfa, Woods53 min
Jul 21, 1:24 AM CDTSevere Thunderstorm WarningOUNAlfalfa, Garfield, Grant51 min
Jul 21, 1:24 AM CDTSevere Thunderstorm WarningOUNMajor51 min
Jul 21, 1:48 AM CDTSevere Thunderstorm WarningOUNBlaine, Kingfisher42 min
Jul 21, 2:14 AM CDTSevere Thunderstorm WarningOUNGarfield, Grant, Kay, Noble46 min
Jul 21, 2:29 AM CDTSevere Thunderstorm WarningOUNCanadian, Kingfisher, Logan, Oklahoma61 min
Jul 21, 2:58 AM CDTSevere Thunderstorm WarningOUNNoble, Payne62 min
Jul 21, 2:58 AM CDTSevere Thunderstorm WarningOUNLincoln62 min
Jul 21, 3:10 AM CDTSevere Thunderstorm WarningOUNCleveland, Grady, McClain50 min
Jul 21, 3:20 AM CDTSevere Thunderstorm WarningOUNPottawatomie, Seminole55 min
Jul 21, 3:55 AM CDTSevere Thunderstorm WarningOUNGarvin, Hughes, Pontotoc65 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2000Every 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; the sounding from the Mesonet's radiosonde archive.