Alert archive / Oklahoma / Mesoscale Discussions in 2011

Mesoscale Discussion 544

April 23, 201132 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Apr 23, 2011, 9:08 PM CDT for 32 counties in Oklahoma. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued
Apr 23, 2011, 9:08 PM CDT (02:08 UTC)
Expired
Apr 23, 2011, 10:45 PM CDT
In force
97 min
Issued by
the Storm Prediction Center
All 32 counties

Adair County, OK, Canadian County, OK, Cherokee County, OK, Cleveland County, OK, Craig County, OK, Creek County, OK, Delaware County, OK, Grady County, OK, Hughes County, OK, Kingfisher County, OK, Lincoln County, OK, Logan County, OK, Mayes County, OK, McClain County, OK, McIntosh County, OK, Muskogee County, OK, Noble County, OK, Nowata County, OK, Okfuskee County, OK, Oklahoma County, OK, Okmulgee County, OK, Osage County, OK, Ottawa County, OK, Pawnee County, OK, Payne County, OK, Pottawatomie County, OK, Rogers County, OK, Seminole County, OK, Sequoyah County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK

The radar

The Tulsa radar (KINX), 43 km from the middle of the area, began a volume at 02:10 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.

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Lamont, OK (KLMN), launched 00:00Z, 2.1 hours before the alert went out and 153 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 2011-04-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Lamont, OK at 00:00Z on 2011-04-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 187 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2165 m above ground
0-6 km bulk shear
67 kt
0-1 km storm-relative helicity
187 m²/s²
0-3 km storm-relative helicity
440 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.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 23, 7:04 PM CDTMesoscale DiscussionSPCAtoka, Bryan, Carter, Choctaw, Coal, Jefferson and 9 more86 min
Apr 23, 9:53 PM CDTSevere Thunderstorm WatchSPCAdair, Atoka, Bryan, Caddo, Canadian, Carter and 47 more7 hr
Apr 23, 10:40 PM CDTMesoscale DiscussionSPCAdair95 min
Apr 24, 2:02 AM CDTMesoscale DiscussionSPCAtoka, Bryan, Caddo, Canadian, Carter, Cherokee and 42 more88 min
Apr 24, 4:17 AM CDTMesoscale DiscussionSPCBlaine, Caddo, Canadian, Cherokee, Cleveland, Coal and 29 more28 min
Apr 24, 1:13 PM CDTMesoscale DiscussionSPCAtoka, Bryan, Carter, Choctaw, Coal, Cotton and 13 more92 min
Apr 24, 2:28 PM CDTSevere Thunderstorm WatchSPCAdair, Atoka, Bryan, Carter, Cherokee, Choctaw and 31 more7 hr
Apr 24, 5:34 PM CDTMesoscale DiscussionSPCAdair, Atoka, Bryan, Choctaw, Coal, Haskell and 11 more26 min
Apr 24, 5:36 PM CDTTornado WatchSPCAtoka, Bryan, Choctaw, Coal, Haskell, Johnston and 7 more7 hr
Apr 24, 6:23 PM CDTMesoscale DiscussionSPCAtoka, Bryan, Choctaw, Latimer, LeFlore, McCurtain and 2 more2 hr

Nearby

Mesoscale Discussions in Oklahoma, 2011Every mesoscale discussion in 2011

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.