Alert archive / Oklahoma / Mesoscale Discussions in 2014

Mesoscale Discussion 414

April 27, 20144 states

The Storm Prediction Center issued this mesoscale discussion at Apr 27, 2014, 7:55 AM CDT for 4 states. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued
Apr 27, 2014, 7:55 AM CDT (12:55 UTC)
Expired
Apr 27, 2014, 9:30 AM CDT
In force
95 min
Issued by
the Storm Prediction Center
All 114 counties

Allen County, KS, Anderson County, KS, Atchison County, KS, Bourbon County, KS, Brown County, KS, Butler County, KS, Chase County, KS, Chautauqua County, KS, Cherokee County, KS, Clay County, KS, Cloud County, KS, Coffey County, KS, Cowley County, KS, Crawford County, KS, Dickinson County, KS, Douglas County, KS, Elk County, KS, Franklin County, KS, Geary County, KS, Greenwood County, KS, Harvey County, KS, Jackson County, KS, Jefferson County, KS, Labette County, KS, Linn County, KS, Lyon County, KS, Marion County, KS, Marshall County, KS, McPherson County, KS, Montgomery County, KS, Morris County, KS, Nemaha County, KS, Neosho County, KS, Osage County, KS, Ottawa County, KS, Pottawatomie County, KS, Republic County, KS, Riley County, KS, Saline County, KS, Sedgwick County, KS, Shawnee County, KS, Sumner County, KS, Wabaunsee County, KS, Washington County, KS, Wilson County, KS, Woodson County, KS, Pawnee County, NE, Atoka County, OK, Bryan County, OK, Canadian County, OK, Carter County, OK, Cherokee County, OK, Choctaw County, OK, Cleveland County, OK, Coal County, OK, Cotton County, OK, Craig County, OK, Creek County, OK, Delaware County, OK, Garfield County, OK, Garvin County, OK, Grady County, OK, Grant County, OK, Haskell County, OK, Hughes County, OK, Jefferson County, OK, Johnston County, OK, Kay County, OK, Kingfisher County, OK, Latimer 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, Pushmataha County, OK, Rogers County, OK, Seminole County, OK, Stephens County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK, Clay County, TX, Collin County, TX, Cooke County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Fannin County, TX, Grayson County, TX, Hunt County, TX, Jack County, TX, Lamar County, TX, Montague County, TX, Parker County, TX, Rockwall County, TX, Tarrant County, TX, Wise County, TX

The radar

The Norman radar (KTLX), 55 km from the middle of the area, began a volume at 12:59 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

Norman, OK (KOUN), launched 12:00Z, 0.9 hours before the alert went out and 68 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 2014-04-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1256 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 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 2014-04-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 335 square meters per square second.1939587897Sfc1 km3 km6 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
1256 J/kg
Mixed-layer CIN
-16 J/kg
Mixed-layer LCL
580 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
335 m²/s²
0-3 km storm-relative helicity
365 m²/s²
Significant tornado parameter
2.1
Supercell composite
10.7

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 27, 5:09 AM CDTMesoscale DiscussionSPCAnderson, Atchison, Barber, Barton, Butler, Chase and 46 more96 min
Apr 27, 6:09 AM CDTSevere Thunderstorm WatchSPCAllen, Anderson, Brown, Butler, Chase, Chautauqua and 41 more6 hr
Apr 27, 10:37 AM CDTMesoscale DiscussionSPCBourbon, Crawford, Doniphan, Johnson, Leavenworth, Linn and 2 more113 min
Apr 27, 11:23 AM CDTTornado WatchSPCBourbon, Cherokee, Crawford, Johnson, Leavenworth, Linn and 2 more8 hr
Apr 27, 11:54 AM CDTMesoscale DiscussionSPCClay, Cloud, Dickinson, Jewell, Mitchell, Ottawa and 3 more96 min
Apr 27, 12:16 PM CDTTornado WatchSPCJewell, Mitchell, Smith7 hr
Apr 27, 4:57 PM CDTMesoscale DiscussionSPCBourbon, Cherokee, Crawford, Johnson, Linn, Miami and 1 more63 min
Apr 27, 6:10 PM CDTMesoscale DiscussionSPCBourbon, Cherokee, Crawford, Johnson, Linn, Miami and 1 more95 min
Apr 27, 6:26 PM CDTTornado WatchSPCJohnson, Leavenworth, Miami, Wyandotte8 hr
Apr 27, 12:48 PM CDTMesoscale DiscussionSPCKeith2 hr
Apr 27, 3:19 PM CDTMesoscale DiscussionSPCAdams, Arthur, Blaine, Brown, Buffalo, Cherry and 19 more86 min
Apr 27, 6:28 PM CDTMesoscale DiscussionSPCBlaine, Boyd, Brown, Cherry, Custer, Garfield and 13 more62 min
Apr 27, 5:33 AM CDTSevere Thunderstorm WatchSPCAlfalfa, Atoka, Blaine, Bryan, Caddo, Canadian and 51 more6 hr
Apr 27, 10:06 AM CDTMesoscale DiscussionSPCAtoka, Bryan, Cherokee, Choctaw, Coal, Craig and 16 more84 min
Apr 27, 12:25 PM CDTMesoscale DiscussionSPCLeFlore, McCurtain, Sequoyah2 hr
Apr 27, 1:46 PM CDTTornado WatchSPCAdair, Cherokee, Choctaw, Craig, Delaware, Haskell and 11 more9 hr
Apr 27, 3:36 PM CDTTornado Watch PDSSPCLeFlore, McCurtain7 hr
Apr 27, 4:52 PM CDTMesoscale DiscussionSPCAdair, Cherokee, Haskell, LeFlore, McCurtain, Sequoyah53 min
Apr 27, 6:11 PM CDTMesoscale DiscussionSPCAdair, Haskell, LeFlore, McCurtain, Sequoyah64 min
Apr 27, 9:03 AM CDTMesoscale DiscussionSPCAnderson, Collin, Dallas, Delta, Ellis, Falls and 15 more27 min
Apr 27, 9:16 AM CDTSevere Thunderstorm WatchSPCAnderson, Bell, Collin, Delta, Falls, Fannin and 16 more6 hr
Apr 27, 11:27 AM CDTMesoscale DiscussionSPCAnderson, Bell, Bosque, Camp, Collin, Coryell and 27 more93 min
Apr 27, 2:56 PM CDTSevere Thunderstorm WatchSPCDelta, Ellis, Fannin, Henderson, Hopkins, Hunt and 6 more5 hr
Apr 27, 5:14 PM CDTMesoscale DiscussionSPCDelta, Falls, Freestone, Henderson, Hopkins, Hunt and 6 more91 min
Apr 27, 6:28 PM CDTMesoscale DiscussionSPCBastrop, Brazos, Burleson, Caldwell, Fayette, Lee and 3 more92 min

Nearby

Mesoscale Discussions in Oklahoma, 2014Mesoscale Discussions in Kansas, 2014Mesoscale Discussions in Texas, 2014Every mesoscale discussion in 2014

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.