Alert archive / Oklahoma / Tornado Warnings in 2001
Tornado Warning 5, NWS Tulsa, OK
NWS Tulsa, OK issued this tornado warning at May 20, 2001, 4:56 PM CDT for McIntosh County, Oklahoma. It was in force for 49 min. 1 report came from inside the area while it was in force.
The area
The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties, with what was reported inside it.
The facts
- Issued
- May 20, 2001, 4:56 PM CDT (21:56 UTC)
- Expired
- May 20, 2001, 5:45 PM CDT
- In force
- 49 min
- Issued by
- NWS Tulsa, OK
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County McIntosh County, OK
The radar
The Tulsa radar (KINX), 93 km from the middle of the area, began a volume at 21:56 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 |
|---|---|---|---|
| May 20, 5:48 PM CDT | Hail 1.75 | Vivian, OK |
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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| May 20, 3:30 PM CDT | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Norman, OK (KOUN), launched 12:00Z, 9.9 hours before the alert went out and 154 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
- 796 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- -20 m²/s²
- 0-3 km storm-relative helicity
- 7 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WFUS54 KTSA 202157 TORTUL OKC091-202245- BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE TULSA OK 456 PM CDT SUN MAY 20 2001 THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A * TORNADO WARNING FOR... MCINTOSH COUNTY IN SOUTHEAST OKLAHOMA * UNTIL 545 PM CDT * AT 456 PM CDT...DOPPLER RADAR INDICATED A TORNADIC THUNDERSTORM 4 MILES NORTH OF HANNA...MOVING NORTHEAST AT 20 MPH. STORM SPOTTERS REPORTED A TORNADO ON THE GROUND WITH THIS STORM. THIS IS A LIFE THREATENING SITUATION...TAKE COVER NOW BOATERS AND CAMPERS ON OR NEAR LAKE EUFAULA SHOULD GET OFF THE LAKE NOW AND SEEK SHELTER. * SOME LOCATIONS NEAR THE PATH OF THIS TORNADO INCLUDE...STIDHAM... VIVIAN...RAIFORD...HANNA AND EUFAULA. THIS IS A LARGE AND DESTRUCTIVE TORNADO PEOPLE NEAR ITS PATH SHOULD TAKE COVER NOW. IF NO UNDERGROUND SHELTER IS AVAILABLE MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR. MOBILE HOMES AND VEHICLES SHOULD BE ABANDONED FOR MORE SUBSTANTIAL SHELTER. AVOID WINDOWS ACT QUICKLY - YOUR LIFE MAY DEPEND ON IT IN ADDITION TO THE TORNADO...LARGE HAIL AND DAMAGING STRAIGHT LINE WINDS CAN BE EXPECTED WITH THIS STORM. GO TO A SAFE PLACE NOW LAT...LON 3536 9597 3518 9592 3533 9534 3551 9534
The office that day
Everything else NWS Tulsa, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 20, 4:17 PM CDT | Severe Thunderstorm Warning | TSA | Osage | 58 min |
| May 20, 4:24 PM CDT | Severe Thunderstorm Warning | TSA | Okfuskee, Okmulgee | 51 min |
| May 20, 4:30 PM CDT | Severe Thunderstorm Warning | TSA | McIntosh | 60 min |
| May 20, 4:31 PM CDT | Tornado Warning | TSA | McIntosh | 29 min |
| May 20, 5:14 PM CDT | Severe Thunderstorm Warning | TSA | Osage | 61 min |
| May 20, 5:23 PM CDT | Severe Thunderstorm Warning | TSA | Creek | 52 min |
| May 20, 5:32 PM CDT | Tornado Warning | TSA | Osage | 43 min |
| May 20, 5:45 PM CDT | Tornado Warning | TSA | McIntosh | 60 min |
| May 20, 5:46 PM CDT | Severe Thunderstorm Warning | TSA | Tulsa | 44 min |
| May 20, 5:51 PM CDT | Severe Thunderstorm Warning | TSA | Rogers, Wagoner | 39 min |
| May 20, 6:02 PM CDT | Tornado Warning | TSA | Pittsburg | 58 min |
| May 20, 6:11 PM CDT | Tornado Warning | TSA | Haskell, Muskogee | 64 min |
| May 20, 6:12 PM CDT | Severe Thunderstorm Warning | TSA | Osage | 48 min |
| May 20, 6:13 PM CDT | Severe Thunderstorm Warning | TSA | Pawnee | 62 min |
| May 20, 6:16 PM CDT | Tornado Warning | TSA | Osage | 44 min |
| May 20, 6:33 PM CDT | Severe Thunderstorm Warning | TSA | Craig, Mayes, Rogers | 57 min |
| May 20, 6:41 PM CDT | Tornado Warning | TSA | Washington | 49 min |
| May 20, 6:43 PM CDT | Severe Thunderstorm Warning | TSA | Creek, Tulsa | 62 min |
| May 20, 6:56 PM CDT | Tornado Warning | TSA | Mayes | 49 min |
| May 20, 6:59 PM CDT | Severe Thunderstorm Warning | TSA | Osage | 46 min |
Nearby
Tornado Warnings in Oklahoma, 2001Every tornado warning in 2001Tornadoes in 2001
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.