Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 71, NWS Tulsa, OK

April 15, 2001Nowata County, Washington County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Apr 15, 2001, 12:11 AM CDT for Nowata County, Washington County, Oklahoma. It was in force for 49 min. 9 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 15, 2001, 12:11 AM CDT (05:11 UTC)
Expired
Apr 15, 2001, 1:00 AM CDT
In force
49 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), 81 km from the middle of the area, began a volume at 05:15 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

TimeReportWhereRemark
Apr 15, 12:12 AM CDTThunderstorm Wind 52 EBurbank, OK
Apr 15, 12:13 AM CDTThunderstorm WindBurbank, OKThunderstorm winds blew down several trees and damaged the roof of a building.
Apr 15, 12:15 AM CDTThunderstorm WindKaw City, OKLarge tree limbs were downed.
Apr 15, 12:30 AM CDTThunderstorm WindBartlesville, OKThunderstorm winds blew signs down.
Apr 15, 12:33 AM CDTHail 1Pawhuska, OK
Apr 15, 12:39 AM CDTHail 0.88Fairfax, OK
Apr 15, 12:47 AM CDTThunderstorm WindNowata, OKThunderstorm winds blew down large tree limbs.
Apr 15, 12:56 AM CDTThunderstorm WindPawnee, OKThunderstorm winds blew down large tree limbs.
Apr 15, 1:00 AM CDTHail 0.75Barnsdall, OK

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.

IssuedProductOfficeLasted
Apr 14, 10:00 PM CDTTornado WatchSPC5 hr

The nearest sounding before it

Lamont, OK (KLMN), launched 00:00Z, 5.2 hours before the alert went out and 118 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-pSkew-T log-p diagram, Lamont, OK at 00:00Z on 2001-04-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1143 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lamont, OK at 00:00Z on 2001-04-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 247 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
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
1143 J/kg
Mixed-layer CIN
-134 J/kg
Mixed-layer LCL
636 m above ground
0-6 km bulk shear
74 kt
0-1 km storm-relative helicity
247 m²/s²
0-3 km storm-relative helicity
327 m²/s²
Significant tornado parameter
0.9
Supercell composite
10.5

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KTSA 150512
SVRTUL
OKC105-113-117-147-150600-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
1211 AM CDT SUN APR 15 2001

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

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

* UNTIL 100 AM CDT

* AT 1211 AM CDT...DOPPLER RADAR INDICATED SEVERE THUNDERSTORMS ALONG
  A LINE EXTENDING FROM 9 MILES NORTHWEST OF WANN TO 16 MILES WEST OF
  RALSTON...MOVING SOUTHEAST AT 55 MPH.

* SOME LOCATIONS NEAR THE PATH OF THESE STORMS INCLUDE...RALSTON...
  CLEVELAND...SKEDEE...BLACKBURN...MARAMEC...PAWNEE...COPAN...
  DEWEY...OCHELATA...BARTLESVILLE...HULAH...FORAKER...BIGHEART...
  PEARSONIA...OKESA...BURBANK...BARNSDALL...FAIRFAX...WYNONA...
  AVANT...HOMINY...SHIDLER...PAWHUSKA...WATOVA...WANN...DELAWARE AND
  NOWATA.

HAIL TO THE SIZE OF QUARTERS AND WIND GUSTS TO 70 MPH CAN BE
EXPECTED IN THE WARNED AREA.

THIS IS A DANGEROUS STORM. IF YOU ARE NEAR ITS PATH YOU SHOULD
PREPARE FOR VERY LARGE HAIL AND STRONG DAMAGING STRAIGHT L?INE WINDS.
SEEK SHELTER IN A STURDY BUILDING AND STAY AWAY FROM WINDOWS!

LAT...LON 3716 9586 3663 9718 3614 9680 3659 9581
          3662 9548

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 14, 7:20 PM CDTSevere Thunderstorm WarningTSAChoctaw, Pushmataha70 min
Apr 14, 11:37 PM CDTSevere Thunderstorm WarningTSAOsage38 min
Apr 15, 12:11 AM CDTSevere Thunderstorm WarningTSAOsage, Pawnee49 min
Apr 15, 12:58 AM CDTSevere Thunderstorm WarningTSAOsage, Pawnee, Tulsa47 min
Apr 15, 1:27 AM CDTSevere Thunderstorm WarningTSADelaware, Mayes, Rogers48 min
Apr 15, 1:27 AM CDTSevere Thunderstorm WarningTSATulsa48 min
Apr 15, 1:40 AM CDTSevere Thunderstorm WarningTSACreek50 min
Apr 15, 2:05 AM CDTSevere Thunderstorm WarningTSAAdair, Cherokee40 min
Apr 15, 2:05 AM CDTSevere Thunderstorm WarningTSAWagoner40 min
Apr 15, 2:28 AM CDTSevere Thunderstorm WarningTSAMuskogee47 min
Apr 15, 3:03 AM CDTSevere Thunderstorm WarningTSASequoyah57 min
Apr 15, 3:54 AM CDTSevere Thunderstorm WarningTSALeFlore66 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.