Alert archive / Oklahoma / Mesoscale Discussions in 2017

Mesoscale Discussion 1200

June 30, 201745 counties in Oklahoma; 12 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Jun 30, 2017, 3:21 PM CDT for 45 counties in Oklahoma; 12 counties in Texas. It was in force for 114 min.

The area

The outline as issued.

The facts

Issued
Jun 30, 2017, 3:21 PM CDT (20:21 UTC)
Expired
Jun 30, 2017, 5:15 PM CDT
In force
114 min
Issued by
the Storm Prediction Center
Chance of a watch
95%
All 57 counties

Atoka County, OK, Beckham 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, Creek County, OK, Custer 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, Lincoln County, OK, Love County, OK, Marshall County, OK, McClain County, OK, McCurtain 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, Seminole County, OK, Sequoyah County, OK, Stephens County, OK, Tillman County, OK, Washita County, OK, Archer County, TX, Baylor County, TX, Childress County, TX, Clay County, TX, Cooke County, TX, Cottle County, TX, Foard County, TX, Hardeman County, TX, Lamar County, TX, Montague County, TX, Wichita County, TX, Wilbarger County, TX

The radar

The Norman radar (KTLX), 70 km from the middle of the area, began a volume at 20:29 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, 8.4 hours before the alert went out and 53 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 2017-06-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1766 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 2017-06-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 79 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
1766 J/kg
Mixed-layer CIN
-23 J/kg
Mixed-layer LCL
805 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
79 m²/s²
0-3 km storm-relative helicity
138 m²/s²
Significant tornado parameter
1.3
Supercell composite
5.2

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 29, 8:37 PM CDTMesoscale DiscussionSPCAlfalfa, Grant, Harper, Woods83 min
Jun 29, 10:56 PM CDTSevere Thunderstorm WatchSPCAlfalfa, Garfield, Grant, Harper, Kay, Major and 7 more6 hr
Jun 30, 1:32 AM CDTMesoscale DiscussionSPCAlfalfa, Garfield, Grant, Kay, Major, Noble and 5 more118 min
Jun 30, 2:42 AM CDTSevere Thunderstorm WatchSPCAdair, Cherokee, Craig, Creek, Delaware, Mayes and 7 more6 hr
Jun 30, 4:37 AM CDTMesoscale DiscussionSPCAlfalfa, Garfield, Grant, Kay, Major, Noble and 7 more113 min
Jun 30, 6:30 AM CDTMesoscale DiscussionSPCAdair, Cherokee, Creek, Muskogee, Okmulgee, Sequoyah and 2 more2 hr
Jun 30, 3:42 PM CDTSevere Thunderstorm WatchSPCAdair, Atoka, Beckham, Bryan, Caddo, Canadian and 41 more7 hr
Jun 30, 6:27 PM CDTMesoscale DiscussionSPCAdair, Atoka, Beckham, Bryan, Caddo, Canadian and 44 more93 min
Jun 30, 4:23 PM CDTMesoscale DiscussionSPCDickens, Fisher, Kent, King, Mitchell, Scurry and 1 more2 hr

Nearby

Mesoscale Discussions in Oklahoma, 2017Mesoscale Discussions in Texas, 2017Every mesoscale discussion in 2017

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.