Alert archive / Oklahoma / Mesoscale Discussions in 2015

Mesoscale Discussion 169

March 31, 2015Crawford County, Franklin County, Sebastian County, Arkansas; 45 counties in Oklahoma; 6 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Mar 31, 2015, 8:14 PM CDT for Crawford County, Franklin County, Sebastian County, Arkansas; 45 counties in Oklahoma; 6 counties in Texas. It was in force for 91 min.

The area

The outline as issued.

The facts

Issued
Mar 31, 2015, 8:14 PM CDT (01:14 UTC)
Expired
Mar 31, 2015, 9:45 PM CDT
In force
91 min
Issued by
the Storm Prediction Center
All 54 counties

Crawford County, AR, Franklin County, AR, Sebastian County, AR, Atoka County, OK, Beckham County, OK, Blaine County, OK, Bryan County, OK, Caddo County, OK, Canadian County, OK, Carter County, OK, Choctaw County, OK, Cleveland County, OK, Coal County, OK, Comanche County, OK, Cotton County, OK, Custer County, OK, Dewey County, OK, Garvin County, OK, Grady County, OK, Greer County, OK, Harmon County, OK, Haskell County, OK, Hughes County, OK, Jackson County, OK, Jefferson County, OK, Johnston County, OK, Kiowa County, OK, Latimer County, OK, LeFlore County, OK, Love County, OK, Marshall County, OK, McClain County, OK, McIntosh County, OK, Murray County, OK, Muskogee County, OK, Okfuskee County, OK, Oklahoma County, OK, Okmulgee County, OK, Pittsburg County, OK, Pontotoc County, OK, Pottawatomie County, OK, Pushmataha County, OK, Roger Mills County, OK, Seminole County, OK, Sequoyah County, OK, Stephens County, OK, Tillman County, OK, Washita County, OK, Cottle County, TX, Foard County, TX, Hardeman County, TX, Wheeler County, TX, Wichita County, TX, Wilbarger County, TX

The radar

The Norman radar (KTLX), 68 km from the middle of the area, began a volume at 01:18 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 00:00Z, 1.2 hours before the alert went out and 52 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 2015-04-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1642 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 2015-04-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 5 square meters per square second.1939587897Sfc1 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
1642 J/kg
Mixed-layer CIN
-15 J/kg
Mixed-layer LCL
1964 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
5 m²/s²
0-3 km storm-relative helicity
79 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.0

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
Mar 31, 8:50 PM CDTMesoscale DiscussionSPCClay, Cleburne, Craighead, Crittenden, Cross, Faulkner and 10 more85 min
Mar 31, 11:43 PM CDTMesoscale DiscussionSPCCrittenden, Cross, Poinsett92 min
Apr 1, 1:16 AM CDTMesoscale DiscussionSPCPolk, Scott89 min
Apr 1, 12:39 PM CDTMesoscale DiscussionSPCBaxter, Benton, Boone, Carroll, Crawford, Franklin and 8 more3 hr
Apr 1, 5:14 PM CDTMesoscale DiscussionSPCArkansas, Baxter, Boone, Carroll, Clark, Clay and 54 more91 min
Mar 31, 9:24 PM CDTMesoscale DiscussionSPCAtoka, Beckham, Caddo, Canadian, Carter, Choctaw and 29 more66 min
Mar 31, 9:40 PM CDTSevere Thunderstorm WatchSPCBlaine, Caddo, Canadian, Carter, Cleveland, Coal and 31 more6 hr
Apr 1, 3:57 PM CDTMesoscale DiscussionSPCBeaver, Beckham, Ellis, Harper, Roger Mills93 min
Apr 1, 2:23 PM CDTMesoscale DiscussionSPCBosque, Brown, Comanche, Cooke, Coryell, Dallas and 18 more3 hr

Nearby

Mesoscale Discussions in Oklahoma, 2015Mesoscale Discussions in Texas, 2015Mesoscale Discussions in Arkansas, 2015Every mesoscale discussion in 2015

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.