Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 46, NWS Tulsa, OK
NWS Tulsa, OK issued this severe thunderstorm warning at Apr 11, 2001, 5:22 AM CDT for Okfuskee County, Okmulgee County, Oklahoma. It was in force for 53 min. 3 reports 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
- Apr 11, 2001, 5:22 AM CDT (10:22 UTC)
- Expired
- Apr 11, 2001, 6:15 AM CDT
- In force
- 53 min
- Issued by
- NWS Tulsa, OK
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Okfuskee County, OK, Okmulgee County, OK
The radar
The Norman radar (KTLX), 124 km from the middle of the area, began a volume at 10:23 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 11, 5:25 AM CDT | Tornado F2 | Coalgate, OK | This tornado formed 4 miles southeast of Coalgate and tracked northeastward for 8 miles before crossing into northwest Atoka County at 0434 CST (See following entry for information about the Atoka County segment). The tornado then continued for another 5 miles |
| Apr 11, 5:34 AM CDT | Tornado F0 | Wardville, OK | This is the 2nd and final county segment to the tornado which formed 4 miles southeast of Coalgate in Coal County at 0425 CST, then moved into Atoka County at 0434 CST. In Atoka County, minor roof damage was sustained to a mobile home, and numerous trees were |
| Apr 11, 5:40 AM CDT | Thunderstorm Wind | Henryetta, OK | Thunderstorm wind blew down large tree limbs. |
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 |
|---|---|---|---|
| Apr 11, 3:15 AM CDT | Tornado Watch | SPC | 5 hr |
The nearest sounding before it
Norman, OK (KOUN), launched 00:00Z, 10.4 hours before the alert went out and 129 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
- 1767 J/kg
- Mixed-layer CIN
- -45 J/kg
- Mixed-layer LCL
- 678 m above ground
- 0-6 km bulk shear
- 63 kt
- 0-1 km storm-relative helicity
- 114 m²/s²
- 0-3 km storm-relative helicity
- 192 m²/s²
- Significant tornado parameter
- 1.0
- Supercell composite
- 3.8
The text
As transmitted, in the capitals the NWS used until 2016.
000
WUUS54 KTSA 111024
SVRTUL
OKC091-107-111-121-111115-
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
522 AM CDT WED APR 11 2001
THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR
SOUTHEASTERN OKFUSKEE COUNTY IN EAST CENTRAL OKLAHOMA
SOUTHERN OKMULGEE COUNTY IN NORTHEAST OKLAHOMA
MCINTOSH COUNTY IN SOUTHEAST OKLAHOMA
PITTSBURG COUNTY IN SOUTHEAST OKLAHOMA
* UNTIL 615 AM CDT
* AT 522 AM CDT SEVERE THUNDERSTORMS CAPABLE OF PRODUCING WINDS UP TO
70 MPH WERE LOCATED ALONG A LINE EXTENDING FROM 5 MILES NORTH
OF LAMAR TO 6 MILES WEST OF WARDVILLE TO 2 MILES NORTHEAST OF
ROBERTA...MOVING NORTHEAST AT 35 MPH.
* SOME LOCATIONS AFFECTED INCLUDE... CANADIAN...INDIANOLA...
CROWDER...SCIPIO...KREBS...ALDERSON...HAYWOOD...SAVANNA...
ASHLAND...BLANCO...KIOWA...MCALESTER...STIDHAM...VIVIAN...
RAIFORD...HANNA...SCHULTER...GRAYSON...HOFFMAN...DEWAR...
HENRYETTA...PHAROAH...CLEARVIEW AND WELEETKA.
DAMAGING WINDS ARE LIKELY WITH THESE STORMS...MOVE TO A SAFE PLACE
NOW.
A TORNADO WATCH IS ALSO IN EFFECT. TORNADOES CAN DEVELOP SUDDENLY
FROM SEVERE THUNDERSTORMS. BE ALERT F OR RAPIDLY CHANGING WEATHER
CONDITIONS.
LAT...LON 3534 9632 3457 9623 3380 9638 3419 9583
3495 9560 3568 9574What 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 11, 3:55 AM CDT, 1 hour 27 minutes earlier.
Area forecast discussion, Apr 11, 3:55 AM CDT, 1 hour 27 minutes before
EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION NATIONAL WEATHER SERVICE TULSA OK 355 AM CDT WED APR 11 2001 RUNNING A BIT BEHIND THIS MORNING... LARGE RAIN SHIELD WITH EMBEDDED SEVERE THUNDERSTORMS IS CURRENTLY MOVING THROUGH ERN OK...WITH ADDITIONAL ACTIVITY FARTHER W ALONG DRYLINE. VAD WIND PROFILES SHOWING MARGINAL DIRECTION SHEAR...ALTHO SPEED SHEAR IS IMPRESSIVE. CHANCE OF SEVERE STORMS WILL CONTINUE INTO THE MORNING...WITH ACTIVITY EXITING ERN EXTENT OF FORECAST AREA 14-16Z. WILL USE RADAR FOR FINAL 1ST PERIOD POPS. INTENSE 982MB SFC CYCLONE WILL LIFT INTO NE TODAY...WITH PRESSURE GRADIENT TIGHTENING ACROSS THE AREA. DEEP LAYERED MIXING WILL HELP BRING DOWN GUSTY SWLY WINDS TO THE SFC...AND WILL GO WITH A WIND ADVISORY FOR ALL ZONES TODAY. MUCH DRIER LOW-LEVEL AIR WILL FILTER EWD LATER TODAY AND TONIGHT. WINDS WILL SLACK OFF TONIGHT...SO THE STRING OF 5 RECORD HIGH LOWS WILL END AT TULSA WITH MORE SEASONABLE TEMPS ON TAP. REMAINDER OF WEEK LOOKS SEASONABLE AND DRY. ZONAL FLOW WILL PERSIST THROUGH THE WEEKEND...WITH SEVERAL FAST-MOVING/IMPOSSIBLE-TO-TIME WAVES PASSING ACROSS THE FORECAST AREA. AVN WANTS TO BRING LOW-LEVEL MOISTURE BACK ON SAT AHEAD OF STRENGTHENING SFC LOW OVER WRN TX. WILL KEEP LOW CHANCE POPS IN FOR SAT AND SUN. FCSTID = 18 PRELIM NUMBERS... TUL 74 49 77 53 / 50 0 0 10 FSM 78 50 82 55 / 70 0 0 10 MLC 76 49 81 57 / 50 0 0 10 BVO 74 48 77 52 / 50 0 0 10 FYV 74 47 76 52 / 70 0 0 10 BYV 74 47 76 52 / 70 0 0 10 MIO 74 47 76 52 / 70 0 0 10 MKO 74 49 77 53 / 50 0 0 10 F10 74 49 77 53 / 50 0 0 10 HHW 76 51 81 58 / 60 0 0 10 .TSA... AR...WIND ADVISORY FOR WEDNESDAY FOR ZONES ARZ001>002...ARZ010>011... ARZ019>020...ARZ029. OK...TORNADO WATCH UNTIL 800 AM CDT FOR ZONES OKZ054>057...OKZ059>062...OKZ064>067...OKZ070>071...OKZ073. WIND ADVISORY FOR WEDNESDAY FOR ZONES OKZ049...OKZ053>076.
The office that day
Everything else NWS Tulsa, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 11, 5:22 AM CDT | Severe Thunderstorm Warning | TSA | McIntosh, Pittsburg | 53 min |
| Apr 11, 5:55 AM CDT | Severe Thunderstorm Warning | TSA | Choctaw, Pushmataha | 50 min |
| Apr 11, 6:14 AM CDT | Severe Thunderstorm Warning | TSA | Haskell, Latimer, Pittsburg | 46 min |
| Apr 11, 6:14 AM CDT | Severe Thunderstorm Warning | TSA | McIntosh | 46 min |
| Apr 11, 6:40 AM CDT | Severe Thunderstorm Warning | TSA | Choctaw, Pushmataha | 65 min |
| Apr 11, 6:53 AM CDT | Severe Thunderstorm Warning | TSA | Haskell, Muskogee, Sequoyah | 52 min |
| Apr 11, 6:53 AM CDT | Severe Thunderstorm Warning | TSA | McIntosh | 52 min |
| Apr 11, 6:53 AM CDT | Severe Thunderstorm Warning | TSA | Latimer | 52 min |
| Apr 11, 7:20 AM CDT | Severe Thunderstorm Warning | TSA | Mayes, Wagoner | 40 min |
| Apr 11, 7:26 AM CDT | Severe Thunderstorm Warning | TSA | LeFlore | 64 min |
| Apr 11, 7:28 AM CDT | Tornado Warning | TSA | Haskell, Sequoyah | 47 min |
| Apr 11, 7:33 AM CDT | Severe Thunderstorm Warning | TSA | Cherokee | 27 min |
| Apr 11, 7:44 AM CDT | Severe Thunderstorm Warning | TSA | Sequoyah | 46 min |
| Apr 11, 7:53 AM CDT | Severe Thunderstorm Warning | TSA | Adair, Cherokee, Delaware | 52 min |
| Apr 11, 7:53 AM CDT | Severe Thunderstorm Warning | TSA | Craig, Mayes, Ottawa | 52 min |
| Apr 11, 8:27 AM CDT | Severe Thunderstorm Warning | TSA | LeFlore | 63 min |
Nearby
Severe Thunderstorm Warnings in Oklahoma, 2001Every severe thunderstorm warning 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.