Alert archive / Oklahoma / Mesoscale Discussions in 2013

Mesoscale Discussion 508

April 17, 201347 counties in Oklahoma; 7 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 17, 2013, 8:36 PM CDT for 47 counties in Oklahoma; 7 counties in Texas. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued
Apr 17, 2013, 8:36 PM CDT (01:36 UTC)
Expired
Apr 17, 2013, 10:00 PM CDT
In force
84 min
Issued by
the Storm Prediction Center
All 54 counties

Caddo County, OK, Canadian County, OK, Carter County, OK, Cherokee County, OK, Cleveland County, OK, Coal County, OK, Comanche County, OK, Cotton County, OK, Craig County, OK, Creek County, OK, Delaware County, OK, Garfield County, OK, Garvin County, OK, Grady County, OK, Hughes County, OK, Jefferson County, OK, Johnston County, OK, Kay County, OK, Kingfisher County, OK, Lincoln County, OK, Logan County, OK, Love County, OK, Marshall County, OK, Mayes County, OK, McClain County, OK, McIntosh County, OK, Murray 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, Pittsburg County, OK, Pontotoc County, OK, Pottawatomie County, OK, Rogers County, OK, Seminole County, OK, Stephens County, OK, Tillman County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK, Archer County, TX, Baylor County, TX, Clay County, TX, Knox County, TX, Montague County, TX, Wichita County, TX, Wilbarger County, TX

The radar

The Norman radar (KTLX), 19 km from the middle of the area, began a volume at 01:39 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, 1.6 hours before the alert went out and 161 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 2013-04-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1 joules per kilogram.LCLEL10008507005003002001001 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 2013-04-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 327 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
1 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
457 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
327 m²/s²
0-3 km storm-relative helicity
520 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.7

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 17, 10:37 PM CDTMesoscale DiscussionSPCCaddo, Canadian, Carter, Cherokee, Cleveland, Comanche and 35 more53 min
Apr 17, 10:47 PM CDTTornado WatchSPCAdair, Atoka, Bryan, Carter, Cherokee, Coal and 28 more7 hr
Apr 17, 11:46 PM CDTMesoscale DiscussionSPCCraig, Ottawa89 min
Apr 18, 2:01 AM CDTMesoscale DiscussionSPCAdair, Cherokee, Delaware, Haskell, Hughes, Latimer and 7 more89 min
Apr 18, 4:02 AM CDTMesoscale DiscussionSPCHaskell, Latimer, LeFlore, McCurtain, Pushmataha, Sequoyah58 min
Apr 18, 4:29 AM CDTMesoscale DiscussionSPCMarshall91 min
Apr 17, 7:30 PM CDTMesoscale DiscussionSPCZavala90 min
Apr 17, 10:47 PM CDTSevere Thunderstorm WatchSPCArcher, Brown, Callahan, Clay, Coke, Coleman and 32 more7 hr
Apr 17, 11:44 PM CDTMesoscale DiscussionSPCArcher, Brown, Callahan, Coke, Coleman, Concho and 19 more91 min

Nearby

Mesoscale Discussions in Oklahoma, 2013Mesoscale Discussions in Texas, 2013Every mesoscale discussion in 2013

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.