Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 240, NWS Tulsa, OK
NWS Tulsa, OK issued this severe thunderstorm warning at Jul 28, 2002, 11:42 PM CDT for Nowata County, Washington County, Oklahoma. It was in force for 63 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jul 28, 2002, 11:42 PM CDT (04:42 UTC)
- Expired
- Jul 29, 2002, 12:45 AM CDT
- In force
- 63 min
- Issued by
- NWS Tulsa, OK
- Area
- Counties, with a storm outline in the text
Counties Nowata County, OK, Washington County, OK
The radar
The Tulsa radar (KINX), 79 km from the middle of the area, began a volume at 04:42 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.
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 nearest sounding before it
Lamont, OK (KLMN), launched 00:00Z, 4.7 hours before the alert went out and 155 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
- 2257 J/kg
- Mixed-layer CIN
- -74 J/kg
- Mixed-layer LCL
- 1318 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 60 m²/s²
- 0-3 km storm-relative helicity
- 153 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.3
The text
As transmitted, in the capitals the NWS used until 2016.
991 WUUS54 KTSA 290442 SVRTUL OKC105-147-290545- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TULSA OK 1141 PM CDT SUN JUL 28 2002 THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NOWATA COUNTY IN NORTHEAST OKLAHOMA WASHINGTON COUNTY IN NORTHEAST OKLAHOMA * UNTIL 1245 AM CDT * AT 1141 PM CDT...DOPPLER RADAR INDICATED SEVERE THUNDERSTORMS ALONG A LINE EXTENDING FROM 5 MILES NORTH OF COPAN TO 10 MILES WEST OF OCHELATA...MOVING EAST AT 50 MPH. * SOME LOCATIONS NEAR THE PATH OF THESE STORMS INCLUDE...OCHELATA... DEWEY...COPAN...NOWATA...DELAWARE...LENAPAH...WANN...WATOVA...NEW ALLUWE AND BARTLESVILLE. WIND GUSTS TO 60 MPH CAN BE EXPECTED IN THE WARNED AREA. STAY INDOORS AND AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED. LAT...LON 3707 9598 3659 9601 3660 9543 3700 9544
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 Jul 28, 9:30 PM CDT, 2 hours 12 minutes earlier.
Area forecast discussion, Jul 28, 9:30 PM CDT, 2 hours 12 minutes before
EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION NATIONAL WEATHER SERVICE TULSA OKLAHOMA 930 PM CDT SUN JUL 28 2002 LINE OF STORMS THAT DEVELOPED ALONG COLD FRONT ARE SLOWLY PUSHING EAST ACROSS KS AND NRN OK. ALTHOUGH SVR POTENTIAL MAY LESSEN ACROSS ERN OK...A 20-30 KT LOW LEVEL JET IN PLACE ACROSS THE REGION WILL HELP MAINTAIN STORM IDENTITY AS THEY PROGRESS TOWARDS NERN OK LATE TONIGHT. CURRENT POPS FORECAST LOOKS GOOD WITH HIGHEST POPS ACROSS NERN OK. WILL NOT ISSUE UPDATED ZFP...THOUGH THICK MID LEVEL/HIGH CLOUDS HAVE KEPT TEMPS UP THIS EVENING...SO WILL GO AHEAD AND UPDATE RDF TEMP TRENDS. FORECAST ID = 23 .TSA... AR...NONE. OK...NONE.
In the hours before
Special weather statement, Jul 28, 10:34 PM CDT, 1 hour 8 minutes before
ARZ001-002-010-011-019-020-029-OKZ049-053>076-291200- EASTERN OKLAHOMA/NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TULSA OK 1034 PM CDT SUN JUL 28 2002 ...UPDATED FOR EVENING TRENDS... A LINE OF THUNDERSTORMS HAS DEVELOPED THIS EVENING FROM KANSAS DOWN INTO NORTH CENTRAL AND NORTHWEST OKLAHOMA. THESE STORMS ARE MOVING TO THE SOUTH AND SOUTHEAST AT 40 TO 50 MILES AN HOUR AND WILL BE CAPABLE OF PRODUCING HEAVY RAIN AND STRONG GUSTY WINDS INTO THE EARLY MORNING HOURS AS THEY MOVE INTO NORTHEAST OKLAHOMA. WINDS OF 50 TO 60 MILES AN HOUR OR GREATER WILL BE POSSIBLE ALONG THE LEADING EDGE OF THE STORMS. THE STORMS ARE EXPECTED TO WEAKEN WITH TIME AFTER MIDNIGHT.
The office that day
Everything else NWS Tulsa, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 28, 10:36 PM CDT | Severe Thunderstorm Warning | TSA | Osage, Pawnee | 54 min |
| Jul 28, 11:26 PM CDT | Severe Thunderstorm Warning | TSA | Osage | 49 min |
Nearby
Severe Thunderstorm Warnings in Oklahoma, 2002Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.