Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 228, NWS Tulsa, OK
NWS Tulsa, OK issued this severe thunderstorm warning at Jul 18, 2002, 2:48 PM CDT for Sequoyah County, Oklahoma. It was in force for 42 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 18, 2002, 2:48 PM CDT (19:48 UTC)
- Expired
- Jul 18, 2002, 3:30 PM CDT
- In force
- 42 min
- Issued by
- NWS Tulsa, OK
- Area
- Counties, with a storm outline in the text
County Sequoyah County, OK
The radar
The Western Arkansas radar (KSRX), 46 km from the middle of the area, began a volume at 19:49 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
Springfield, MO (KSGF), launched 12:00Z, 7.8 hours before the alert went out and 175 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
- 2076 J/kg
- Mixed-layer CIN
- -15 J/kg
- Mixed-layer LCL
- 601 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 134 m²/s²
- 0-3 km storm-relative helicity
- 120 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.5
The text
As transmitted, in the capitals the NWS used until 2016.
175 WUUS54 KTSA 181948 SVRTUL OKC135-182030- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TULSA OK 248 PM CDT THU JUL 18 2002 THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SEQUOYAH COUNTY IN EAST CENTRAL OKLAHOMA * UNTIL 330 PM CDT * AT 248 PM CDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 4 MILES NORTHWEST OF SALLISAW...MOVING EAST AT 10MPH. * SOME LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...SALLISAW... MULDROW...BRUSHY AND MARBLE CITY. HAIL TO THE SIZE OF DIMES AND 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 3564 9493 3541 9497 3537 9453 3563 9450
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 18, 11:06 AM CDT, 3 hours 42 minutes earlier.
Area forecast discussion, Jul 18, 11:06 AM CDT, 3 hours 42 minutes before
EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION NATIONAL WEATHER SERVICE TULSA OKLAHOMA 1106 AM CDT THU JUL 18 2002 MORNING ANALYSIS SHOWS UPPER TROUGH AT 500 MB EXTENDING FROM CENTRAL MISSOURI INTO NORTHERN OKLAHOMA. RADAR SHOWED AREA OF SHOWERS AND THUNDERSTORMS...ASSOCIATED WITH 850 MB WARM ADVECTION AHEAD OF THE UPPER TROUGH...MOVING EAST ACROSS NORTHWEST ARKANSAS. EXPECT THE CURRENT CONVECTION TO EVENTUALLY MOVE OFF TO THE EAST THIS AFTERNOON...BUT SOME REDEVELOPMENT EXPECTED THIS AFTERNOON IN VICINITY OF UPPER TROUGH. WILL SEND AN UPDATE BY 1120 AM TO MAKE FIRST PERIOD CHANGES TO POPS AND TEMPERATURES. WILL KEEP IN CHANCE CATEGORY POPS ACROSS EASTERN AND SOUTHERN ZONES...AND WILL INSERT SOME LOW POPS ACROSS EXTREME NORTHEAST OKLAHOMA NEAREST THE DEVELOPING CONVECTION IN SOUTHEAST KANSAS. WILL ALSO RAISE HIGH TEMPERATURES ACROSS WESTERN PARTS OF NORTHEAST OKLAHOMA WHERE CURRENT TRENDS SUGGEST READINGS WILL MAKE LOWER 90S. NO SIGNIFICANT CHANGES TO LATER PERIODS OF FORECAST. FCSTID = 9 .TSA... AR...NONE. OK...NONE.
In the hours before
Special weather statement, Jul 18, 1:15 PM CDT, 1 hour 33 minutes before
ARZ001-002-010-011-019-020-029-OKZ049-053>076-191200- EASTERN OKLAHOMA/NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TULSA OK 115 PM CDT THU JUL 18 2002 ...SCATTERED THUNDERSTORMS EXPECTED THIS AFTERNOON OVER EXTREME EASTERN OKLAHOMA AND NORTHWEST ARKANSAS... SCATTERED THUNDERSTORMS WILL CONTINUE TO DEVELOP OVER EXTREME EASTERN OKLAHOMA AND NORTHWEST ARKANSAS THROUGH THE AFTERNOON...MAINLY TO THE SOUTH AND EAST OF TULSA. THUNDERSTORMS HAVE DEVELOPED OVER FAR EASTERN OKLAHOMA EARLY THIS AFTERNOON AS A RESULT OF DAYTIME HEATING AND THE PRESENCE OF AN UPPER LEVEL TROUGH EXTENDING FROM MISSOURI INTO NORTHEAST OKLAHOMA. BRIEF HEAVY RAIN AND FREQUENT LIGHTNING WILL ACCOMPANY STRONGER STORMS. THUNDERSTORMS ARE EXPECTED TO DIMINISH THIS EVENING WITH LOSS OF DAYTIME HEATING.
The office that day
Everything else NWS Tulsa, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 18, 6:36 PM CDT | Severe Thunderstorm Warning | TSA | Delaware | 39 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.