Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2000
Severe Thunderstorm Warning 368, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at Jul 21, 2000, 3:55 AM CDT for Garvin County, Hughes County, Pontotoc County, Oklahoma. It was in force for 65 min. 5 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Jul 21, 2000, 3:55 AM CDT (08:55 UTC)
- Expired
- Jul 21, 2000, 5:00 AM CDT
- In force
- 65 min
- Issued by
- NWS Norman, OK
- Area
- Whole counties
Counties Garvin County, OK, Hughes County, OK, Pontotoc County, OK
The radar
The Norman radar (KTLX), 74 km from the middle of the area, began a volume at 08:56 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 21, 4:20 AM CDT | Thunderstorm Wind | Holdenville, OK | Damage was sustained to roofs, trees, and power poles on Eastern Hills Road. |
| Jul 21, 4:25 AM CDT | Thunderstorm Wind | Holdenville, OK | An RV was blown over at Lake Holdenville, which is 5 miles southeast of Holdenville. In addition, trees and power poles were downed, and numerous house roofs sustained minor structural damage. |
| Jul 21, 4:30 AM CDT | Thunderstorm Wind | Stratford, OK | Trees were downed. |
| Jul 21, 4:40 AM CDT | Thunderstorm Wind | Wynnewood, OK | Trees were downed. |
| Jul 21, 4:45 AM CDT | Thunderstorm Wind | Ada, OK | Damage was sustained to a driveway entrance and a porch light fixture. |
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 nearest sounding before it
Norman, OK (KOUN), launched 00:00Z, 8.9 hours before the alert went out and 74 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.
- Mixed-layer CAPE
- 1499 J/kg
- Mixed-layer CIN
- -118 J/kg
- Mixed-layer LCL
- 1859 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 41 m²/s²
- 0-3 km storm-relative helicity
- 140 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 4.5
The text
As transmitted, in the capitals the NWS used until 2016.
117 WUUS54 KOUN 210856 SVROKC OKC049-063-123-211000- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE NORMAN OK 355 AM CDT FRI JUL 21 2000 THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... PONTOTOC COUNTY IN EAST CENTRAL OKLAHOMA HUGHES COUNTY IN SOUTHEAST OKLAHOMA GARVIN COUNTY IN SOUTHERN OKLAHOMA * UNTIL 500 AM CDT * AT 355 AM CDT...DOPPLER RADAR INDICATED SEVERE THUNDERSTORMS ALONG A LINE EXTENDING FROM 17 MILES NORTHWEST OF YEAGER TO 13 MILES NORTH OF STRATFORD TO 5 MILES SOUTH OF LINDSAY...MOVING SOUTHEAST AT 50 MPH. * LOCATIONS IN THE WARNING INCLUDE ADA...ALLEN...BYNG...CALVIN... ELMORE CITY...FITTSTOWN...FOSTER...FRANCIS...GERTY...HOLDENVILLE... LAMAR...LINDSAY...MAYSVILLE...PAOLI...PAULS VALLEY...PERNELL... ROFF...STRATFORD...VANOSS...WETUMKA...WYNNEWOOD AND YEAGER WIND GUSTS FROM 60 TO 80 MPH ARE LIKELY. DAMAGING WIND GUSTS MAY OCCUR 10 TO 20 MINUTES BEFORE THE ONSET OF PRECIPITATION FROM THESE STORMS. $$ 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 21, 3:31 AM CDT, 24 minutes earlier.
Area forecast discussion, Jul 21, 3:31 AM CDT, 24 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE NORMAN OK 330 A CDT FRI JUL 21 2000 MCS...WITH WIND GUSTS OF AT LEAST 70 TO 80 MPH...NOW MOVING ACROSS THE AREA EARLY THIS MORNING WILL LAY DOWN SFC BOUNDARY WHICH WILL PUSH INTO SOUTHERN OKLAHOMA AND PROBABLY INTO NORTH TEXAS DURING THE DAY TODAY. COULD SEE SOME RECOVERY OF THIS BOUNDARY NORTH THIS AFTN AND EVENING BEFORE ANOTHER SYSTEM DEVELOPS IN THE HIGH PLAINS LATE THIS AFTN AS ANOTHER WAVE MOVES OUT OF THE ROCKIES INTO THE CENTRAL AND SOUTHERN PLAINS. THIS COMPLEX WILL THEN ROLL SOUTHEAST ACROSS THE AREA LATE TONIGHT INTO SATURDAY. THIS ONE COULD BE SLIGHTLY FARTHER SOUTH THAN THE ONE THIS MORNING WITH SFC BOUNDARY BEING FARTHER SOUTH. FOR TODAY WILL MAKE LAST MINUTE CHANGES TO FIRST PERIOD POPS BASED ON THE LATEST RADAR AND SATELITE PICS POSSIBLE. COLD POOL ASSOCIATED WITH THIS SYSTEM WILL KEEP TEMPS IN THE NORTH IN THE 80S TODAY. THESE COOLER READINGS WILL MAKE THEIR WAY SOUTH FOR SATURDAY AS THE DAY STARTS WITH RAIN AND CLOUDY CONDITIONS. COULD SEE YET ANOTHER COMPLEX SATURDAY NIGHT BUT THINGS LOOK LESS LIKELY FOR THIS TO OCCUR AS SFC BOUNDARY LOOKS TO PUSH INTO AT LEAST NORTHERN AND PERHAPS CENTRAL TX AND UPPER FLOW APPEARS THAT IT WILL BE FROM NORTH TO SOUTH KEEPING ANYTHING THAT DEVELOPS OVER THE HIGH PLAINS TO OUR WEST. HOWEVER WITH FRONT IN PROXIMITY TO SOUTHERN OK WILL KEEP SLIGHTLY HIGHER POPS GOING THERE INTO SUNDAY WITH LOWER POPS TO THE NORTH. NOT TOO EXCITED ABOUT PRECIP CHANCES INTO THE FIRST PART OF NEXT WEEK AS IT LOOKS LIKE BEST CHANCES WILL BE SOUTH AND EAST OF MY AREA...BUT WILL NOT MAKE ANY DRASTIC CHANGES TO GOING EXTENDED. WILL SEE TEMPS BEGIN TO REBOUND BY END OF EXTENDED AS WELL. FCSTID = 30 PRELIMINARY CCF NUMBERS... OKC 91 67 85 67 / 70 40 60 30 HBR 96 69 90 68 / 40 40 60 30 SPS 100 71 94 70 / 30 20 50 40 GAG 88 64 84 64 / 50 60 40 30 PNC 85 65 83 67 / 70 60 60 30 DUA 94 72 91 68 / 60 40 50 40 .OUN... OK...NONE. TX...NONE.
In the hours before
Special weather statement, Jul 20, 11:37 PM CDT, 4 hours 18 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, 4 hours 18 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, 3 hours 28 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
CWLocal storm report, Jul 21, 12:31 AM CDT, 3 hours 24 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
CWThe office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 11:15 PM CDT | Severe Thunderstorm Warning | OUN | Harper | 45 min |
| Jul 20, 11:42 PM CDT | Severe Thunderstorm Warning | OUN | Ellis | 18 min |
| Jul 21, 12:02 AM CDT | Severe Thunderstorm Warning | OUN | Harper, Woods, Woodward | 43 min |
| Jul 21, 12:02 AM CDT | Severe Thunderstorm Warning | OUN | Ellis | 43 min |
| Jul 21, 12:10 AM CDT | Severe Thunderstorm Warning | OUN | Grant | 50 min |
| Jul 21, 12:32 AM CDT | Severe Thunderstorm Warning | OUN | Alfalfa, Woods | 53 min |
| Jul 21, 12:50 AM CDT | Severe Thunderstorm Warning | OUN | Major, Woodward | 35 min |
| Jul 21, 1:24 AM CDT | Severe Thunderstorm Warning | OUN | Alfalfa, Garfield, Grant | 51 min |
| Jul 21, 1:24 AM CDT | Severe Thunderstorm Warning | OUN | Major | 51 min |
| Jul 21, 1:48 AM CDT | Severe Thunderstorm Warning | OUN | Blaine, Kingfisher | 42 min |
| Jul 21, 2:14 AM CDT | Severe Thunderstorm Warning | OUN | Garfield, Grant, Kay, Noble | 46 min |
| Jul 21, 2:29 AM CDT | Severe Thunderstorm Warning | OUN | Canadian, Kingfisher, Logan, Oklahoma | 61 min |
| Jul 21, 2:58 AM CDT | Severe Thunderstorm Warning | OUN | Noble, Payne | 62 min |
| Jul 21, 2:58 AM CDT | Severe Thunderstorm Warning | OUN | Lincoln | 62 min |
| Jul 21, 3:10 AM CDT | Severe Thunderstorm Warning | OUN | Cleveland, Grady, McClain | 50 min |
| Jul 21, 3:20 AM CDT | Severe Thunderstorm Warning | OUN | Pottawatomie, Seminole | 55 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.