Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 89, NWS Tulsa, OK

April 20, 2000Haskell County, Muskogee County, Sequoyah County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Apr 20, 2000, 12:40 AM CDT for Haskell County, Muskogee County, Sequoyah County, Oklahoma. It was in force for 65 min. 2 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Apr 20, 2000, 12:40 AM CDT (05:40 UTC)
Expired
Apr 20, 2000, 1:45 AM CDT
In force
65 min
Issued by
NWS Tulsa, OK
Area
Whole counties

Counties Haskell County, OK, Muskogee County, OK, Sequoyah County, OK

The radar

The Western Arkansas radar (KSRX), 68 km from the middle of the area, began a volume at 05:42 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 20, 12:50 AM CDTThunderstorm WindWhitefield, OKThunderstorm winds blew down several large trees.
Apr 20, 1:01 AM CDTThunderstorm WindMc Key, OKThunderstorm winds blew down a large tree.

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 19, 10:15 PM CDTTornado WatchSPC6 hr
Apr 20, 12:30 AM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 5.7 hours before the alert went out and 199 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, Springfield, MO at 00:00Z on 2000-04-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1428 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Springfield, MO at 00:00Z on 2000-04-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 131 square meters per square second.19395878Sfc1 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
1428 J/kg
Mixed-layer CIN
-113 J/kg
Mixed-layer LCL
1062 m above ground
0-6 km bulk shear
54 kt
0-1 km storm-relative helicity
131 m²/s²
0-3 km storm-relative helicity
247 m²/s²
Significant tornado parameter
1.2
Supercell composite
12.7

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KTSA 200542
SVRTUL
OKC061-101-135-200645-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
1240 AM CDT THU APR 20 2000

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN MUSKOGEE COUNTY IN EAST CENTRAL OKLAHOMA
  WESTERN SEQUOYAH COUNTY IN EAST CENTRAL OKLAHOMA
  HASKELL COUNTY IN SOUTHEAST OKLAHOMA

* UNTIL 145 AM CDT

* AT 1240 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  SEVERE THUNDERSTORMS ALONG A LINE EXTENDING FROM 7 MILES NORTHWEST
  OF KEEFETON TO 6 MILES NORTH OF ENTERPRISE TO 14 MILES SOUTHWEST OF
  ENTERPRISE...MOVING EAST AT 45 MPH.

* SOME LOCATIONS NEAR THE PATH OF THESE STORMS INCLUDE...WEBBERS
FALLS...BRAGGS...KEEFETON...OKTAHA...WARNER...PORUM...BRIARTOWN...
GORE...VIAN...TAMAHA...KEOTA...WHITEFIELD...ENTERPRISE...MC
CURTAIN...KINTA...LEQUIRE AND STIGLER

HAIL TO THE SIZE OF DIMES AND WIND GUSTS TO 65 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.

CALL 1-800-722-2778 TO REPORT SEVE&RE WEATHER TO THE NATIONAL WEATHER
SERVICE.

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 19, 10:22 PM CDTSevere Thunderstorm WarningTSAOsage, Pawnee38 min
Apr 19, 10:33 PM CDTSevere Thunderstorm WarningTSACreek, Okfuskee42 min
Apr 19, 11:02 PM CDTSevere Thunderstorm WarningTSAOsage, Pawnee, Washington58 min
Apr 19, 11:06 PM CDTSevere Thunderstorm WarningTSAOkfuskee, Okmulgee54 min
Apr 19, 11:14 PM CDTSevere Thunderstorm WarningTSACreek46 min
Apr 19, 11:29 PM CDTSevere Thunderstorm WarningTSAOkmulgee, Tulsa, Wagoner61 min
Apr 19, 11:29 PM CDTSevere Thunderstorm WarningTSAMuskogee61 min
Apr 19, 11:37 PM CDTSevere Thunderstorm WarningTSANowata38 min
Apr 19, 11:46 PM CDTTornado WarningTSAMuskogee, Wagoner44 min
Apr 19, 11:59 PM CDTSevere Thunderstorm WarningTSARogers, Tulsa46 min
Apr 19, 11:59 PM CDTSevere Thunderstorm WarningTSACreek46 min
Apr 20, 12:01 AM CDTSevere Thunderstorm WarningTSACraig, Ottawa59 min
Apr 20, 12:17 AM CDTSevere Thunderstorm WarningTSACherokee, Mayes, Muskogee58 min
Apr 20, 12:23 AM CDTSevere Thunderstorm WarningTSAMcIntosh, Pittsburg52 min
Apr 20, 12:44 AM CDTSevere Thunderstorm WarningTSAAdair, Delaware46 min
Apr 20, 1:21 AM CDTSevere Thunderstorm WarningTSAAdair, Sequoyah54 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2000Every severe thunderstorm warning in 2000

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.