Alert archive / Arkansas / Mesoscale Discussions in 2013

Mesoscale Discussion 1670

August 8, 201328 counties in Arkansas; 12 counties in Missouri; 7 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Aug 8, 2013, 5:24 PM CDT for 28 counties in Arkansas; 12 counties in Missouri; 7 counties in Oklahoma. It was in force for 66 min.

The area

The outline as issued.

The facts

Issued
Aug 8, 2013, 5:24 PM CDT (22:24 UTC)
Expired
Aug 8, 2013, 6:30 PM CDT
In force
66 min
Issued by
the Storm Prediction Center
Chance of a watch
95%
All 47 counties

Baxter County, AR, Benton County, AR, Boone County, AR, Carroll County, AR, Clay County, AR, Cleburne County, AR, Conway County, AR, Crawford County, AR, Franklin County, AR, Fulton County, AR, Greene County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Johnson County, AR, Lawrence County, AR, Logan County, AR, Madison County, AR, Marion County, AR, Newton County, AR, Pope County, AR, Randolph County, AR, Searcy County, AR, Sebastian County, AR, Sharp County, AR, Stone County, AR, Van Buren County, AR, Washington County, AR, Barry County, MO, Carter County, MO, Christian County, MO, Douglas County, MO, Howell County, MO, McDonald County, MO, Newton County, MO, Oregon County, MO, Ozark County, MO, Ripley County, MO, Stone County, MO, Taney County, MO, Adair County, OK, Cherokee County, OK, Delaware County, OK, Haskell County, OK, Latimer County, OK, LeFlore County, OK, Sequoyah County, OK

The radar

The Springfield radar (KSGF), 113 km from the middle of the area, began a volume at 22:26 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

Springfield, MO (KSGF), launched 12:00Z, 10.4 hours before the alert went out and 95 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, Springfield, MO at 12:00Z on 2013-08-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 195 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, Springfield, MO at 12:00Z on 2013-08-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 65 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
195 J/kg
Mixed-layer CIN
-51 J/kg
Mixed-layer LCL
651 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
65 m²/s²
0-3 km storm-relative helicity
-14 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
Aug 8, 3:57 AM CDTSevere Thunderstorm WatchSPCBenton, Carroll, Madison, Washington3 hr
Aug 8, 5:32 PM CDTSevere Thunderstorm WatchSPCBaxter, Benton, Boone, Carroll, Clay, Cleburne and 43 more6 hr
Aug 7, 8:16 PM CDTMesoscale DiscussionSPCBeaver, Cimarron, Texas89 min
Aug 7, 9:02 PM CDTMesoscale DiscussionSPCAlfalfa, Blaine, Custer, Dewey, Ellis, Garfield and 6 more88 min
Aug 7, 10:24 PM CDTSevere Thunderstorm WatchSPCAlfalfa, Beckham, Blaine, Caddo, Canadian, Custer and 17 more7 hr
Aug 7, 11:30 PM CDTMesoscale DiscussionSPCBeaver, Texas60 min
Aug 8, 3:18 AM CDTMesoscale DiscussionSPCCreek, Kay, Lincoln, Logan, Noble, Nowata and 7 more87 min
Aug 8, 3:00 PM CDTMesoscale DiscussionSPCBeaver, Beckham, Cimarron, Ellis, Greer, Harmon and 2 more60 min
Aug 8, 3:21 PM CDTSevere Thunderstorm WatchSPCBeaver, Beckham, Cimarron, Custer, Dewey, Greer and 7 more9 hr
Aug 8, 5:02 PM CDTMesoscale DiscussionSPCBlaine, Caddo, Canadian, Carter, Cleveland, Coal and 30 more88 min
Aug 8, 6:23 PM CDTSevere Thunderstorm WatchSPCAtoka, Blaine, Bryan, Caddo, Canadian, Carter and 22 more8 hr
Aug 8, 6:47 PM CDTMesoscale DiscussionSPCBeaver, Beckham, Cimarron, Custer, Dewey, Greer and 7 more88 min

Nearby

Mesoscale Discussions in Arkansas, 2013Mesoscale Discussions in Missouri, 2013Mesoscale Discussions in Oklahoma, 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.