Alert archive / Oklahoma / Severe Thunderstorm Watches in 2001

Severe Thunderstorm Watch 245

May 18, 200119 counties in Oklahoma; 4 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at May 18, 2001, 3:30 AM CDT for 19 counties in Oklahoma; 4 counties in Texas. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
May 18, 2001, 3:30 AM CDT (08:30 UTC)
Expired
May 18, 2001, 8:00 AM CDT
In force
5 hr
Issued by
the Storm Prediction Center
All 23 counties

Atoka County, OK, Bryan County, OK, Carter County, OK, Choctaw County, OK, Coal County, OK, Haskell County, OK, Hughes County, OK, Johnston County, OK, Latimer County, OK, Love County, OK, Marshall County, OK, McIntosh County, OK, Murray County, OK, Okfuskee County, OK, Pittsburg County, OK, Pontotoc County, OK, Pushmataha County, OK, Seminole County, OK, Sequoyah County, OK, Cooke County, TX, Fannin County, TX, Grayson County, TX, Montague County, TX

Warnings issued inside it

9 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
May 18, 4:03 AM CDTSevere Thunderstorm WarningOUNJohnston, Pontotoc, Seminole57 min
May 18, 4:18 AM CDTSevere Thunderstorm WarningTSAOkfuskee57 min
May 18, 4:35 AM CDTSevere Thunderstorm WarningOUNCoal, Hughes55 min
May 18, 4:59 AM CDTSevere Thunderstorm WarningOUNAtoka61 min
May 18, 5:07 AM CDTSevere Thunderstorm WarningTSAMcIntosh, Okmulgee, Pittsburg53 min
May 18, 5:23 AM CDTSevere Thunderstorm WarningTSAPushmataha52 min
May 18, 5:39 AM CDTSevere Thunderstorm WarningTSAHaskell, Latimer, Muskogee51 min
May 18, 5:48 AM CDTSevere Thunderstorm WarningTSAChoctaw42 min
May 18, 6:14 AM CDTSevere Thunderstorm WarningTSAPushmataha46 min

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 8.5 hours before the alert went out and 126 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, Norman, OK at 00:00Z on 2001-05-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2992 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, Norman, OK at 00:00Z on 2001-05-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 57 square meters per square second.1939Sfc1 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
2992 J/kg
Mixed-layer CIN
-6 J/kg
Mixed-layer LCL
1092 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
57 m²/s²
0-3 km storm-relative helicity
95 m²/s²
Significant tornado parameter
0.0
Supercell composite
4.5

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 17, 9:30 PM CDTSevere Thunderstorm WatchSPCAlfalfa, Beaver, Beckham, Blaine, Custer, Dewey and 13 more6 hr
May 18, 2:00 AM CDTSevere Thunderstorm WatchSPCCaddo, Canadian, Cleveland, Comanche, Cotton, Garvin and 7 more4 hr

Nearby

Severe Thunderstorm Watches in Oklahoma, 2001Severe Thunderstorm Watches in Texas, 2001Every severe thunderstorm watch 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.