Alert archive / Oklahoma / Severe Thunderstorm Watches in 2001

Severe Thunderstorm Watch 225

May 11, 200119 counties in Oklahoma

The Storm Prediction Center issued this severe thunderstorm watch at May 11, 2001, 4:00 PM CDT for 19 counties in Oklahoma. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
May 11, 2001, 4:00 PM CDT (21:00 UTC)
Expired
May 11, 2001, 9:00 PM CDT
In force
5 hr
Issued by
the Storm Prediction Center

Counties Atoka County, OK, Canadian County, OK, Cleveland County, OK, Coal County, OK, Garvin County, OK, Grady County, OK, Haskell County, OK, Hughes County, OK, Johnston County, OK, Latimer County, OK, McClain County, OK, Murray County, OK, Oklahoma County, OK, Pittsburg County, OK, Pontotoc County, OK, Pottawatomie County, OK, Pushmataha County, OK, Seminole County, OK, Stephens County, OK

The radar

The Norman radar (KTLX), 54 km from the middle of the area, began a volume at 21:03 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.

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
May 11, 4:34 PM CDTSevere Thunderstorm WarningOUNCanadian41 min
May 11, 5:20 PM CDTSevere Thunderstorm WarningTSAPittsburg40 min
May 11, 6:06 PM CDTSevere Thunderstorm WarningOUNCoal39 min
May 11, 6:54 PM CDTSevere Thunderstorm WarningOUNAtoka, Coal51 min

The nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 9.0 hours before the alert went out and 56 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 12:00Z on 2001-05-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 590 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 12:00Z on 2001-05-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 179 square meters per square second.193958Sfc1 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
590 J/kg
Mixed-layer CIN
-250 J/kg
Mixed-layer LCL
1202 m above ground
0-6 km bulk shear
10 kt
0-1 km storm-relative helicity
179 m²/s²
0-3 km storm-relative helicity
329 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.9

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.

Nearby

Severe Thunderstorm Watches in Oklahoma, 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; radar from the NEXRAD Level II archive.