Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 47, NWS Tulsa, OK

April 11, 2001Choctaw County, Pushmataha County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Apr 11, 2001, 5:55 AM CDT for Choctaw County, Pushmataha County, Oklahoma. It was in force for 50 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, 5:55 AM CDT (10:55 UTC)
Expired: Apr 11, 2001, 6:45 AM CDT
In force: 50 min
Issued by: NWS Tulsa, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Choctaw County, OK, Pushmataha County, OK

The radar

The Western Arkansas radar (KSRX), 171 km from the middle of the area, began a volume at 10:55 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, 6:30 AM CDT	Thunderstorm Wind	Soper, OK	Thunderstorm winds blew the roofs off of two barns.
Apr 11, 6:42 AM CDT	Thunderstorm Wind 52 E	Antlers, OK
Apr 11, 6:45 AM CDT	Thunderstorm Wind	Grant, OK	Thunderstorm winds damaged a trailer.

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 nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 10.9 hours before the alert went out and 185 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

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

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WUUS54 KTSA 111055
SVRTUL
OKC023-127-111145-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
555 AM CDT WED APR 11 2001

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR
  CHOCTAW COUNTY IN SOUTHEAST OKLAHOMA
  PUSHMATAHA COUNTY IN SOUTHEAST OKLAHOMA

* UNTIL 645 AM CDT

* AT 555 AM CDT SEVERE THUNDERSTORMS CAPABLE OF PRODUCING WINDS UP TO
  65 MPH WERE LOCATED ALONG A LINE EXTENDING FROM 6 MILES NORTH
  OF REDDEN TO 7 MILES NORTH OF FARRIS TO 11 MILES SOUTH OF YUBA...
  MOVING NORTHEAST AT 35 MPH.

* SOME LOCATIONS AFFECTED INCLUDE... DUNBAR...KELLOND...OLETA...
  TUSKAHOMA...STANLEY...NASHOBA...SNOW...KOSOMA...MOYERS...CLOUDY...
  RATTAN...CLAYTON...ANTLERS...KENT...MESSER...SOPER...BOSWELL...
  SAWYER...GOODLAND AND HUGO.

THESE STORMS WILL AFFECT A LARGE PORTION OF THE WARNED AREA WITH
WIDESPREAD DAMAGING WINDS. PERSONS IN THESE AREAS SHOULD TAKE COVER
FROM THESE STORMS.

A TORNADO WATCH IS ALSO IN EFFECT. TORNADOES CAN DEVELOP SUDDENLY
FROM SEVERE THUNDERSTORMS. BE ALERT FOR RAPIDLY CHANGING WEATHER
CONDITIONS.

LAT...LON 3459 9577 3432 9586 3386 9590 3391 9546
     a     3424 9520 3467 9522

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 Apr 11, 3:55 AM CDT, 2 hours earlier.

Area forecast discussion, Apr 11, 3:55 AM CDT, 2 hours 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, 5:22 AM CDT	Severe Thunderstorm Warning	TSA	Okfuskee, Okmulgee	53 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, 2001 Every 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.