Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 77, NWS Tulsa, OK
NWS Tulsa, OK issued this severe thunderstorm warning at Apr 7, 1997, 10:23 PM CDT for Muskogee County, Oklahoma. It was in force for 52 min. 1 report 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
- Apr 7, 1997, 10:23 PM CDT (03:23 UTC)
- Expired
- Apr 7, 1997, 11:15 PM CDT
- In force
- 52 min
- Issued by
- NWS Tulsa, OK
- Area
- Whole counties
County Muskogee County, OK
The radar
The Tulsa radar (KINX), 64 km from the middle of the area, began a volume at 03:27 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 |
|---|---|---|---|
| Apr 7, 10:45 PM CDT | Hail 0.75 | Boynton, OK | Isolated severe thunderstorms developed in northeast Oklahoma during the evening of April 7th. The storms produced dime size hail at Broken Arrow, 2 miles northwest of Checotah, and at Boynton. |
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, 3.4 hours before the alert went out and 188 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2874 m above ground
- 0-6 km bulk shear
- 62 kt
- 0-1 km storm-relative helicity
- 95 m²/s²
- 0-3 km storm-relative helicity
- 352 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KTUL 080326 RRA SVRTUL OKC101-080415- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TULSA OK 1023 PM CDT MON APR 7 1997 THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1115 PM CDT FOR PEOPLE IN THE FOLLOWING LOCATION... IN EAST CENTRAL OKLAHOMA ...NORTHERN MUSKOGEE COUNTY AT 1023 PM...RADAR SHOWED A SEVERE THUNDERSTORM 8 MILES SOUTHWEST OF HASKELL ON THE MUSKOGEE...OKMULGEE COUNTY LINE. THE STORM WAS MOVING NORTHEAST AT 35 MPH. THE CITIES OF MUSKOGEE...HASKELL AND BOYNTON ARE IN THE PATH OF THIS STORM. HAIL TO THE SIZE OF NICKELS CAN BE EXPECTED IN THE WARNED AREA. DURING THE STORM MOVE INDOORS AND STAY AWAY FROM WINDOWS. TO PROTECT YOURSELF FROM LIGHTNING DO NOT USE THE TELEPHONE OR HAND HELD ELECTRICAL APPLIANCES...UNLESS IN AN EMERGENCY. MOTORISTS SHOULD BE ALERT FOR WATER ON ROADWAYS AND NEVER DRIVE ONTO A FLOODED ROAD. KEEP TUNED TO THIS STATION FOR THE LATEST WEATHER BULLETINS.
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 Tulsa, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 7, 6:35 PM CDT, 3 hours 48 minutes earlier.
Area forecast discussion, Apr 7, 6:35 PM CDT, 3 hours 48 minutes before
EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION NATIONAL WEATHER SERVICE TULSA OK 630 PM CDT MON APR 7 1997 UPDATED ZNS TO MENTION ISO EVE SHRA IN NW CORN OF ARK AND NE OK. THESE SHOWERS SHUD DIMINISH/MOVE NE OF FA SOON AFTER SUNSET WITH ADDITIONAL PCP DVLPMNT EXPECTED AFT MIDNIGHT. NO OTR CHGS. /13 .TUL... OK...NONE. AR...NONE.
In the hours before
Local storm report, Apr 7, 9:43 PM CDT, 40 minutes before
PRELIMINARY STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
943 PM CDT MON APR 7 1997
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
940 PM BROKEN ARROW OK .75 INCH HAIL
04/07/97 TULSALocal storm report, Apr 7, 9:44 PM CDT, 39 minutes before
PRELIMINARY STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
943 PM CDT MON APR 7 1997
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
940 PM BROKEN .ARROW OK .75 INCH HAIL
04/07/97 TULSASpecial weather statement, Apr 7, 9:45 PM CDT, 38 minutes before
OKZ060-064>067-070-080600- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE TULSA OK 945 PM CDT MON APR 7 1997 ...ISOLATED THUNDERSTORMS ACROSS PARTS OF NORTHEAST OKLAHOMA ARE PRODUCING SOME SMALL HAIL ACROSS THE AREA THIS EVENING... AT 945 PM THE STRONGEST CELLS WERE LOCATED OVER CREEK AND OKMULGEE COUNTIES MOVING QUICKLY EASTWARD. PERSONS IN TULSA...WAGONER AND MUSKOGEE COUNTIES CAN EXPECT SOME BRIEF HEAVY RAINFALL...VIVID LIGHTNING AND SMALL HAIL THROUGH 11 PM. THESE TYPES OF STORMS ARE KNOWN AS ELEVATED THUNDERSTORMS WITH BASES THIS EVENING AROUND 8000 FEET ABOVE THE GROUND. THE AIR ALOFT IS FAIRLY COLD FOR THIS TIME OF YEAR. AS FROZEN PARTICLES IN THE STORM FALL INTO THE VERY DRY AIR...THEY CAN SOMETIMES REMAIN IN A FROZEN STATE ALL THE WAY TO THE GROUND. THE PROGRESS OF THESE STORMS WILL CONTINUE TO BE MONITORED. PLEASE REFER TO THE SHORT TERM FORECASTS ISSUED BY THIS OFFICE FOR THE LATEST INFORMATION.
Special weather statement, Apr 7, 9:53 PM CDT, 30 minutes before
OKZ060-064>067-070-080600- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE TULSA OK 945 PM CDT MON APR 7 1997 ...ISOLATED THUNDERSTORMS ACROSS PARTS OF NORTHEAST OKLAHOMA ARE PRODUCING SOME SMALL HAIL ACROSS THE AREA THIS EVENING... AT 945 PM THE STRONGEST CELLS WERE LOCATED OVER CREEK AND OKMULGEE COUNTIES MOVING QUICKLY EASTWARD. PERSONS IN TULSA...WAGONER AND MUSKOGEE COUNTIES CAN EXPECT SOME BRIEF HEAVY RAINFALL...VIVID LIGHTNING AND SMALL HAIL THROUGH 11 PM. THESE TYPES OF STORMS ARE KNOWN AS ELEVATED THUNDERSTORMS WITH BASES THIS EVENING AROUND 8000 FEET ABOVE THE GROUND. THE AIR ALOFT IS FAIRLY COLD FOR THIS TIME OF YEAR. AS FROZEN PARTICLES IN THE STORM FALL INTO THE V>ERY DRY AIR...THEY CAN SOMETIMES REMAIN IN A FROZEN STATE ALL THE WAY TO THE GROUND. THE PROGRESS OF THESE STORMS WILL CONTINUE TO BE MONITORED. PLEASE REFER TO THE SHORT TERM FORECASTS ISSUED BY THIS OFFICE FOR THE LATEST INFORMATION.
Local storm report, Apr 7, 10:19 PM CDT, 4 minutes before
PRELIMINARY STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
1019 PM CDT MON APR 07 1997
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
1005 PM 2NW CHECOTAH OK .75 INCH HAIL
04/07/97 MCINTOSHLocal storm report, Apr 7, 10:20 PM CDT, 3 minutes before
PRELIMINARY STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
1019 PM CDT MON APR 07 1997
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
1005 PM 2NW CHECOTAH OK .75 INCH HAIL
04/07/97 MCINTOSHNearby
Severe Thunderstorm Warnings in Oklahoma, 1997Every severe thunderstorm warning in 1997
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.