Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 7, NWS Tulsa, OK

February 9, 2001Delaware County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Feb 9, 2001, 3:15 AM CST for Delaware County, Oklahoma. It was in force for 30 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: Feb 9, 2001, 3:15 AM CST (09:15 UTC)
Expired: Feb 9, 2001, 3:45 AM CST
In force: 30 min
Issued by: NWS Tulsa, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Delaware County, OK

The radar

The Tulsa radar (KINX), 71 km from the middle of the area, began a volume at 09:17 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
Feb 9, 3:30 AM CST	Thunderstorm Wind 52 E	Grove, OK
Feb 9, 3:30 AM CST	Thunderstorm Wind	Jay, OK	Thunderstorm winds blew the roof off a mobile home.
Feb 9, 3:45 AM CST	Thunderstorm Wind	Grove, OK	Thunderstorm winds blew down several 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
Feb 9, 2:45 AM CST	Tornado Watch	SPC	4 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 9.3 hours before the alert went out and 106 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: 69 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 556 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 362 m²/s²
0-3 km storm-relative helicity: 399 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KTSA 090915
SVRTUL
OKC041-090945-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
315 AM CST FRI FEB 9 2001

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  DELAWARE COUNTY IN NORTHEAST OKLAHOMA

* UNTIL 345 AM CST

* AT 315 AM CST...DOPPLER RADAR INDICATED SEVERE THUNDERSTORMS ALONG
  A LINE EXTENDING FROM 11 MILES SOUTHWEST OF CLEORA TO 8 MILES
  SOUTHWEST OF CHLOETA TO 9 MILES WEST OF LEACH...MOVING EAST AT 50
  MPH.

* SOME LOCATIONS NEAR THE PATH OF THESE STORMS INCLUDE...BERNICE...
  GROVE...CLEORA...CHLOETA...COLCORD...KANSAS...TWIN OAKS...LEACH AND
  JAY.

DAMAGING WINDS MAY OCCUR UP TO 10 MILES AHEAD OF THE HEAVY RAIN. 
MOVE TO A SAFE PLACE NOW.

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

LAT...LON 3664 9503 3638 9501 3618 9503 3620 9460
          3649 9460 3667 9465

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 Feb 8, 11:29 PM CST, 3 hours 46 minutes earlier.

Area forecast discussion, Feb 8, 11:29 PM CST, 3 hours 46 minutes before

EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OK
1129 PM CST THU FEB 8 2001

WITH TEMPS ALREADY IN THE MID 30S OVER NRN OSAGE COUNTY...DECIDED TO
GO AHEAD WITH A WINTER WEATHER ADVISORY FOR OUR ZONES NW OF TUL.
WARM GROUND WILL GREATLY LIMIT ANY ICING ON ROADS...ALTHO A FEW
EXPOSED ROADWAYS MAY SEE SOME MINOR ACCUMULATIONS.

FCSTID = 18

.TUL...
AR...NONE.
OK...WINTER WEATHER ADVISORY THROUGH EARLY FRIDAY MORNING FOR ZONES
OKZ054>055...OKZ059.

In the hours before

Local storm report, Feb 9, 2:30 AM CST, 45 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
230 AM CST FRI FEB 09 2001

TIME(CST)  .....CITY LOCATION..... STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0155 AM    3 E OKEMAH                OK    58 MPH TSTM GUST
02/09/01   OKFUSKEE                        MESONET REPORT

The office that day

Everything else NWS Tulsa, OK issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Feb 9, 1:59 AM CST	Severe Thunderstorm Warning	TSA	Okfuskee, Okmulgee	46 min
Feb 9, 2:31 AM CST	Severe Thunderstorm Warning	TSA	Okmulgee, Tulsa, Wagoner	44 min
Feb 9, 2:31 AM CST	Severe Thunderstorm Warning	TSA	Muskogee	44 min
Feb 9, 3:01 AM CST	Severe Thunderstorm Warning	TSA	Mayes	29 min
Feb 9, 3:07 AM CST	Severe Thunderstorm Warning	TSA	Choctaw, Pushmataha	53 min
Feb 9, 3:07 AM CST	Severe Thunderstorm Warning	TSA	Latimer, Pittsburg	53 min
Feb 9, 3:25 AM CST	Severe Thunderstorm Warning	TSA	Adair, Cherokee	50 min
Feb 9, 3:41 AM CST	Severe Thunderstorm Warning	TSA	Delaware	49 min
Feb 9, 3:56 AM CST	Severe Thunderstorm Warning	TSA	Haskell, Latimer, LeFlore, Pushmataha	64 min
Feb 9, 3:56 AM CST	Severe Thunderstorm Warning	TSA	Choctaw	64 min
Feb 9, 4:11 AM CST	Severe Thunderstorm Warning	TSA	Sequoyah	49 min
Feb 9, 4:15 AM CST	Severe Thunderstorm Warning	TSA	Adair	60 min
Feb 9, 4:32 AM CST	Severe Thunderstorm Warning	TSA	LeFlore, Sequoyah	58 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.