Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 12, NWS Tulsa, OK

February 9, 2001Sequoyah County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Feb 9, 2001, 4:11 AM CST for Sequoyah County, Oklahoma. It was in force for 49 min. No storm report in the archive falls 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.

The facts

Issued: Feb 9, 2001, 4:11 AM CST (10:11 UTC)
Expired: Feb 9, 2001, 5:00 AM CST
In force: 49 min
Issued by: NWS Tulsa, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Sequoyah County, OK

The radar

The Western Arkansas radar (KSRX), 51 km from the middle of the area, began a volume at 10:14 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.

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, 10.2 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: 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 091011
SVRTUL
OKC135-091100-

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

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SEQUOYAH COUNTY IN EAST CENTRAL OKLAHOMA

* UNTIL 500 AM CST

* AT 411 AM CST...DOPPLER RADAR INDICATED SEVERE THUNDERSTORMS ALONG
  A LINE EXTENDING FROM 4 MILES SOUTHWEST OF VIAN TO 7 MILES SOUTH OF
  VIAN TO 18 MILES SOUTHWEST OF SALLISAW...MOVING NORTHEAST AT 50
  MPH.

* SOME LOCATIONS NEAR THE PATH OF THESE STORMS INCLUDE...MARBLE
  CITY...SHORT...BRUSHY...VIAN...ROLAND...MULDROW AND SALLISAW.

DAMAGING WINDS MAY OCCUR UP TO 10 MILES AHEAD OF THE HEAVY RAIN
AND HAIL. 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 3548 9519 3534 9500 3537 9485 3541 9446
          3565 9449 3564 9496

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 9, 4:00 AM CST, 11 minutes earlier.

Area forecast discussion, Feb 9, 4:00 AM CST, 11 minutes before

EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OK
400 AM CST FRI FEB 9 2001

SEVERE LINE OF THUNDERSTORMS IS RACING THROUGH EASTERN OKLAHOMA
EARLY THIS MORNING. STRONG COLD FRONT EXTENDS FROM EAST OF
MCALESTER NORTHEAST THROUGH DELAWARE COUNTY. THE TEMPERATURE DROPPED
NEARLY 30 DEGREES WHEN THE FRONT CAME THROUGH TULSA SHORTLY
AFTER 1 AM...AND MUSKOGEE NOTED A 30 DEGREE DROP IN TEMPERATURE IN
ABOUT A HALF HOUR AS THE FRONT MOVED THROUGH.

WILL CLEAR MANY OF THE COUNTIES IN THE TORNADO WATCH BOX...BY ZONE
ISSUANCE AS LINE IS THROUGH MUCH OF EASTERN OKLAHOMA. WILL KEEP
WINTER WEATHER ADVISORY GOING THIS MORNING...AS TEMPERATURES WILL
JUST CONTINUE FALLING ACROSS NORTHWEST COUNTIES. PORTIONS OF OSAGE
COUNTY ARE AT OR BELOW FREEZING NOW. BIG QUESTION WILL BE HOW LONG
PRECIPITATION LASTS. WARM GROUND TEMPERATURES WILL LIMIT ICING
POTENTIAL. HOWEVER 06Z MESOETA SOUNDINGS INDICATE ENOUGH COLD AIR AT
THE SURFACE TO CREATE A WINTRY MIX OF SNOW/SLEET AT LEAST OVER THE
FAR NORTHERN ZONES. WILL LIKELY EXTEND WINTER WEATHER ADVISORY OVER
AT LEAST THE NORTHERN TIER OF COUNTIES. LOCATIONS AS FAR SOUTH AS
TULSA MAY SEE SOME SLEET MIX IN...BUT OTHERWISE FREEZING RAIN WILL
BE THE MAIN PRECIPITATION TYPE ONCE TEMPERATURE FALLS BELOW 32 F.
FRONT WILL CLEAR FORECAST AREA BY 12Z...WITH TEMPERATURES PLUMMETING
AS THE FRONT COMES THROUGH. NOT EXPECTING MUCH RECOVERY TODAY...AND
WILL GO WELL BELOW GUIDANCE ESPECIALLY IN THE EASTERN ZONES. AS FAR
AS POPS...WILL GO HIGHER IN THE EAST...AND RATHER LOW IN THE WEST AS
SQUALL LINE HAS MOVED THROUGH.

MID LEVEL MOISTURE CLEARS OUT RATHER QUICKLY TODAY...AND MAY SEE
SOME SUNSHINE IN THE SOUTHERN ZONES...BUT NORTHERN ZONES WILL BE
MOSTLY CLOUDY. UPPER LOW WILL TRACK ACROSS EASTERN KANSAS
TODAY...AND SURFACE HIGH PRESSURE WILL BUILD IN TONIGHT ACROSS THE
REGION ALLOWING FOR EXCELLENT RADIATIONAL COOLING. TEMPERATURES
SATURDAY SHOULD MODERATE SOMEWHAT...AS WINDS SHIFT BACK AROUND TO
THE SOUTH BY LATE IN THE DAY.

QUICK LOOK AT EXTENDED SHOWS LATEST AVN/UKMET SHOW DRIER SOLUTIONS
FOR SATURDAY NIGHT/SUNDAY PERIOD. ALSO MAY ADD POPS TO MONDAY PER
LATEST AVN/MRF RUN. OTHERWISE NO MAJOR CHANGES PLANNED.

FCSTID = 6

...PRELIMINARY NUMBERS...
TUL   34  14  40  26 /  30   0   0   0
FSM   40  17  43  27 /  90   0   0   0
MLC   40  18  40  28 /  20   0   0   0
BVO   33   8  39  26 /  20   0   0   0
FYV   35  17  41  24 /  90  10   0  10
BYV   35  17  41  24 /  90  10   0  10
MIO   35   9  38  26 /  50   0   0   0
MKO   40  18  40  28 /  20   0   0   0
F10   34  14  40  26 /  30   0   0   0
HHW   44  21  46  29 /  20   0   0   0

.TUL...
AR...TORNADO WATCH UNTIL 700 AM CST FRIDAY FOR ZONES ARZ001>002...
ARZ010>011...ARZ019>020...ARZ029.

OK...TORNADO WATCH UNTIL 700 AM CST FRIDAY FOR ZONES
OKZ049...OKZ053...OKZ066...OKZ062>063...HOKZ067>076.

WINTER WEATHER ADVISORY FOR THIS MORNING FOR ZONES OKZ054>059...
OKZ059.

TAYLOR

In the hours before

Local storm report, Feb 9, 2:30 AM CST, 1 hour 41 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

Local storm report, Feb 9, 3:21 AM CST, 50 minutes before

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

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

B0222 AM    LOCUST GROVE              OK    1 INCH HAIL
02/09/01   MAYES                           EMERGENCY MANAGEMENT
                                           REPORT

Local storm report, Feb 9, 3:34 AM CST, 37 minutes before

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

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

0230 AM    GROVE                     OK    60 MPH TSTM GUST
02/09/01   DELAWARE                        SPOTTER 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, 3:15 AM CST	Severe Thunderstorm Warning	TSA	Delaware	30 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, 4:15 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.