Alert archive / Arkansas / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 156, NWS Tulsa, OK
NWS Tulsa, OK issued this severe thunderstorm warning at May 12, 2002, 8:26 PM CDT for Sequoyah County, Oklahoma; Crawford County, Sebastian County, Arkansas. It was in force for 64 min. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- May 12, 2002, 8:26 PM CDT (01:26 UTC)
- Expired
- May 12, 2002, 9:30 PM CDT
- In force
- 64 min
- Issued by
- NWS Tulsa, OK
- Area
- Counties, with a storm outline in the text
Counties Crawford County, AR, Sebastian County, AR, Sequoyah County, OK
The radar
The Western Arkansas radar (KSRX), 18 km from the middle of the area, began a volume at 01:30 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 |
|---|---|---|---|
| May 12, 8:40 PM CDT | Thunderstorm Wind 61 E | Hartford, AR | Thunderstorm winds estimated at 70 miles an hour blew trees down. |
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.
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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| May 12, 7:00 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Norman, OK (KOUN), launched 00:00Z, 1.4 hours before the alert went out and 259 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
- 2 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 488 m above ground
- 0-6 km bulk shear
- 71 kt
- 0-1 km storm-relative helicity
- -21 m²/s²
- 0-3 km storm-relative helicity
- 140 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 8.5
The text
As transmitted, in the capitals the NWS used until 2016.
000
WUUS54 KTSA 130126
SVRTUL
ARC033-131-OKC135-130300-
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
825 PM CDT SUN MAY 12 2002
THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
SEQUOYAH COUNTY IN EAST CENTRAL OKLAHOMA
CRAWFORD COUNTY IN NORTHWEST ARKANSAS
SEBASTIAN COUNTY IN WEST CENTRAL ARKANSAS
* UNTIL 930 PM CDT
* AT 824 PM CDT...DOPPLER RADAR INDICATED SEVERE THUNDERSTORMS ALONG
A LINE EXTENDING FROM 4 MILES SOUTHWEST OF GANS TO 5 MILES SOUTH OF
SPIRO TO 7 MILES WEST OF HEAVENER...MOVING NORTHEAST AT 25 MPH.
* SOME LOCATIONS NEAR THE PATH OF THESE STORMS INCLUDE...GANS...
MULDROW...ROLAND...MOFFETT...POTEAU...HEAVENER...HOWE...CAMERON...
SPIRO...POCOLA...ARKOMA...FORT SMITH...HARTFORD...HACKETT...
BARLING...MIDLAND...EXCELSIOR...BONANZA...JENNY LIND...VAN BUREN
AND FIGURE FIVE.
HAIL TO THE SIZE OF DIMES AND WIND GUSTS TO 60 MPH CAN BE EXPECTED
WITH THIS LINE OF STORMS.
LAT...LON 3540 9478 3519 9462 3484 9474 3494 9434
3534 9419 3559 9440What 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 May 12, 6:42 PM CDT, 1 hour 44 minutes earlier.
Area forecast discussion, May 12, 6:42 PM CDT, 1 hour 44 minutes before
EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION NATIONAL WEATHER SERVICE TULSA OK 642 PM CDT SUN MAY 12 2002 MOST CONVECTION OVER CWA IS ELEVATED...WITH AN EXCEPTION BEING SEVERE CELL IN WASHINGTON COUNTY ARKANSAS. USING MODIFIED RUC SOUNDING...GETTING A LITTLE OVER 3000 J/KG FOR THIS CELL...VERSUS ABOUT 1200 J/KG WITH ELEVATED STORMS AROUND OKFUSKEE COUNTY. MANY OF THE ELEVATED STORMS LOOK TO BE INDUCING INFLOW ON ON THEIR NORTHERN FLANKS. BOTH SURFACE-BASED STORMS AND ELEVATED STORMS ONLY GETTING 10-15 KT OF RELATIVE INFLOW. PER VWP...COLD AIR ABOUT 3700 FEET DEEP OVER TULSA AREA. ELEVATED STORMS MOSTLY DEPENDENT ON UPPER LIFT THAT SHOULD SLIDE EAST OF CWA BY AROUND MIDNIGHT. THINK THAT STRONG ELEVATED STORMS WILL CONTINUE THROUGH THE EVENING. .TSA... AR...NONE. OK...NONE. MATHEWS
In the hours before
Local storm report, May 12, 3:43 PM CDT, 4 hours 43 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
343 PM CDT SUN MAY 12 2002
TIME(CDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0311 PM 2 NORTH PETTIT OK .88 INCH HAIL 05/12/02
CHEROKEE DIME TO NICKEL HAILLocal storm report, May 12, 3:50 PM CDT, 4 hours 36 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
350 PM CDT SUN MAY 12 2002
...CORRECTION FOR DATE GROUP...
TIME(CDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0311 PM 2 NORTH PETTIT OK .88 INCH HAIL
05/12/02 CHEROKEE DIME TO NICKEL HAILLocal storm report, May 12, 4:07 PM CDT, 4 hours 19 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
407 PM CDT SUN MAY 12 2002
TIME(CDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0400 PM 5 N CHOUTEAU OK .75 INCH HAIL
05/12/02 MAYES REPORTED BY EMA
0404 PM PRYOR OK 1.75 INCH HAIL
05/12/02 MAYES REPORTED BY EMALocal storm report, May 12, 6:18 PM CDT, 2 hours 8 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
618 PM CDT SUN MAY 12 2002
TIME(CDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0417 PM KETCHUM OK .75 INCH HAIL
05/12/02 CRAIG REPORTED BY LAW
ENFORCEMENT
0509 PM 1 E GROVE OK 1.00 INCH HAIL
05/12/02 DELAWARE REPORTED BY EMA
0530 PM 9 NNW TAHLEQUAH OK WIND DAMAGE
05/12/02 CHEROKEE POWER LINES BLOWN DOWN.
REPORTED BY SPOTTERS
0511 PM 3 NE GROVE OK 1.00 INCH HAIL
05/12/02 DELAWARE REPORTED BY SPOTTERS
0528 PM 1 W WESTVILLE OK WIND DAMAGE
05/12/02 ADAIR LARGE TREE BLOWN DOWN.
REPORTED BY LAW ENFORCEMENT
0539 PM STILWELL OK .75 INCH HAIL
05/12/02 ADAIR REPORTED BY LAW
ENFORCEMENT
0540 PM 5 WNW WESTVILLE OK 59 MPH TSTM WIND GUST
05/12/02 ADAIR REPORTED BY OKLAHOMA
MESONETThe office that day
Everything else NWS Tulsa, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 12, 7:00 PM CDT | Severe Thunderstorm Warning | TSA | Okmulgee | 45 min |
| May 12, 7:06 PM CDT | Severe Thunderstorm Warning | TSA | Pittsburg | 39 min |
| May 12, 7:13 PM CDT | Severe Thunderstorm Warning | TSA | Tulsa | 32 min |
| May 12, 7:36 PM CDT | Severe Thunderstorm Warning | TSA | Latimer | 54 min |
| May 12, 8:00 PM CDT | Severe Thunderstorm Warning | TSA | LeFlore | 60 min |
| May 12, 8:01 PM CDT | Severe Thunderstorm Warning | TSA | Mayes, Rogers | 44 min |
| May 12, 8:53 PM CDT | Severe Thunderstorm Warning | TSA | Ottawa | 37 min |
| May 12, 9:39 PM CDT | Severe Thunderstorm Warning | TSA | LeFlore | 21 min |
| May 12, 7:03 PM CDT | Severe Thunderstorm Warning | TSA | Carroll | 57 min |
| May 12, 7:18 PM CDT | Severe Thunderstorm Warning | TSA | Madison | 42 min |
Nearby
Severe Thunderstorm Warnings in Arkansas, 2002Severe 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.