Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 91, NWS Tulsa, OK

April 22, 2001Nowata County, Washington County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Apr 22, 2001, 7:25 PM CDT for Nowata County, Washington County, Oklahoma. It was in force for 50 min. 2 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 22, 2001, 7:25 PM CDT (00:25 UTC)
Expired: Apr 22, 2001, 8:15 PM CDT
In force: 50 min
Issued by: NWS Tulsa, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Nowata County, OK, Washington County, OK

The radar

The Tulsa radar (KINX), 67 km from the middle of the area, began a volume at 00:26 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 22, 7:30 PM CDT	Thunderstorm Wind 52 E	Ramona, OK
Apr 22, 8:00 PM CDT	Thunderstorm Wind	Nowata, OK	Thunderstorm winds blew down a large tree limb.

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 22, 7:00 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 0.4 hours before the alert went out and 179 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: 19 J/kg
Mixed-layer CIN: -256 J/kg
Mixed-layer LCL: 1428 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 95 m²/s²
0-3 km storm-relative helicity: 177 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 230025
SVRTUL
OKC105-147-230115-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
725 PM CDT SUN APR 22 2001

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NOWATA COUNTY IN NORTHEAST OKLAHOMA
  WASHINGTON COUNTY IN NORTHEAST OKLAHOMA

* UNTIL 815 PM CDT

* AT 725 PM CDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 6
  MILES WEST OF RAMONA...MOVING NORTHEAST AT 60 MPH.

* SOME LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...DEWEY...
  OCHELATA...RAMONA...BARTLESVILLE...WANN...LENAPAH...DELAWARE AND
  NOWATA.

HAIL TO THE SIZE OF DIMES AND WIND GUSTS TO 60 MPH CAN BE EXPECTED IN
THE WARNED AREA.

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

LAT...LON 3663 9607 3644 9599 3679 9544 3700 9545
          3700 9577

`

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 22, 3:20 PM CDT, 4 hours 5 minutes earlier.

Area forecast discussion, Apr 22, 3:20 PM CDT, 4 hours 5 minutes before

EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OK
320 PM CDT SUN APR 22 2001

LATEST SATL LOOP SHOWING STRONG UPPER SYSTEM MOVING FROM EASTERN CO
NORTHEASTWARD INTO WESTERN NEB/KS.  SURFACE LOW WAS LOCATED OVER
WESTERN KS AT 20Z...AND WILL BE LIFTING QUICKLY TO THE NORTHEAST
TOWARD IA/MN THROUGH THE NIGHT.  BROKEN LINE OF STRONG/SEVERE
CONVECTION HAS BEEN OCCURRING ALONG TRAILING DRYLINE/FRONT THROUGH
THE AFTERNOON ACROSS WESTERN AND CENTRAL KS/OK.  WILL CONTINUE TO
SEE THIS LINE ADVANCE INTO THE AREA THROUGH THE EVENING.  LINE HAS
BEEN WEAKENING OVER THE PAST HOUR OR SO...BUT STILL POTENTIAL FOR
MAINLY SOME STRONG WINDS.  WILL KEEP LIKELY POPS GOING ACROSS THE
AREA THROUGH THE NIGHT.  ALSO STILL EXPECT TO SEE SOME FURTHER
BUILDING ON THE SOUTHERN EXTENT OF THE LINE.

WILL KEEP SOME LINGERING LOW POPS IN THE FAR EASTERN AND SOUTHERN
ZONES FOR EARLY MONDAY MORNING...THEN DRY WEATHER WILL PREVAIL
THROUGH THE REMAINDER OF THE UPCOMING WEEK AS UPPER RIDGE BUILDS IN
AND DOMINATES.  A SHORT COOL SPELL IN STORE BEHIND THIS SYSTEM
TOMORROW/TOMORROW NIGHT BEFORE TEMPS REBOUND AGAIN AS UPPER RIDGE
BUILDS IN.

FCSTID = 4
TUL   57  66  45  72 /  70  10   0   0
FSM   63  70  43  74 /  60  30  10   0
MLC   60  70  45  74 /  70  10   0   0
BVO   53  65  41  72 /  70  10   0   0
FYV   58  67  41  70 /  60  30   0   0
BYV   58  67  41  70 /  60  30    0   0
MIO   57  66  41  70 /  70  10   0   0
MKO   57  66  44  73 /  70  10   0   0
F10   57  66  45  72 /  70  10   0   0
HHW   62  70  45  74 /  60  30  10   0

.TSA...
AR...NONE.
OK...NONE.

In the hours before

Local storm report, Apr 22, 6:15 PM CDT, 1 hour 10 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
615 PM CDT SUN APR 22 2001

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

0550 PM    OILTON                    OK    60 MPH TSTM GUST
04/22/01   CREEK                           OILTON EMERGENCY MANAGER

0550 PM    2 N OILTON                OK    .75 INCH HAIL
04/22/01   CREEK                           SPOTTER REPORT

Local storm report, Apr 22, 6:35 PM CDT, 50 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
635 PM CDT SUN APR 22 2001

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

0614 PM    WYNONA                    OK    60 MPH TSTM GUST
04/22/01   OSAGE                           SPOTTER REPORT

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 22, 7:41 PM CDT	Severe Thunderstorm Warning	TSA	Rogers	49 min
Apr 22, 8:07 PM CDT	Severe Thunderstorm Warning	TSA	Craig	38 min
Apr 22, 8:29 PM CDT	Severe Thunderstorm Warning	TSA	Okmulgee	46 min
Apr 23, 12:52 AM CDT	Severe Thunderstorm Warning	TSA	Adair, Delaware	53 min
Apr 23, 2:45 AM CDT	Severe Thunderstorm Warning	TSA	Choctaw	60 min
Apr 23, 3:23 AM CDT	Severe Thunderstorm Warning	TSA	Pushmataha	67 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.