Alert archive / Arkansas / Mesoscale Discussions in 2014

Mesoscale Discussion 1441

July 23, 20144 states

The Storm Prediction Center issued this mesoscale discussion at Jul 23, 2014, 11:56 AM CDT for 4 states. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued: Jul 23, 2014, 11:56 AM CDT (16:56 UTC)
Expired: Jul 23, 2014, 1:30 PM CDT
In force: 94 min
Issued by: the Storm Prediction Center
Chance of a watch: 80%

All 60 counties

Baxter County, AR, Benton County, AR, Boone County, AR, Carroll County, AR, Cleburne County, AR, Conway County, AR, Crawford County, AR, Faulkner County, AR, Franklin County, AR, Fulton County, AR, Garland County, AR, Howard County, AR, Izard County, AR, Johnson County, AR, Logan County, AR, Madison County, AR, Marion County, AR, Montgomery County, AR, Newton County, AR, Perry County, AR, Pike County, AR, Polk County, AR, Pope County, AR, Scott County, AR, Searcy County, AR, Sebastian County, AR, Sevier County, AR, Stone County, AR, Van Buren County, AR, Washington County, AR, Yell County, AR, Cherokee County, KS, Labette County, KS, Barry County, MO, Jasper County, MO, McDonald County, MO, Newton County, MO, Ozark County, MO, Stone County, MO, Taney County, MO, Adair County, OK, Atoka County, OK, Cherokee County, OK, Craig County, OK, Delaware County, OK, Haskell County, OK, Latimer County, OK, LeFlore County, OK, Mayes County, OK, McCurtain County, OK, McIntosh County, OK, Muskogee County, OK, Nowata County, OK, Ottawa County, OK, Pittsburg County, OK, Pushmataha County, OK, Rogers County, OK, Sequoyah County, OK, Wagoner County, OK, Washington County, OK

The radar

The Western Arkansas radar (KSRX), 80 km from the middle of the area, began a volume at 16:57 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.

Severe Thunderstorm Watch 431Jul 23, 1:00 PM CDT

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 4.9 hours before the alert went out and 115 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 3863 J/kg
Mixed-layer CIN: -51 J/kg
Mixed-layer LCL: 981 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 76 m²/s²
0-3 km storm-relative helicity: 95 m²/s²
Significant tornado parameter: 1.4
Supercell composite: 7.1

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.

Issued	Product	Office	Counties	Lasted
Jul 23, 6:29 AM CDT	Mesoscale Discussion	SPC	Clay, Craighead, Greene, Lawrence, Randolph	2 hr
Jul 23, 12:59 PM CDT	Severe Thunderstorm Watch	SPC	Arkansas, Baxter, Benton, Boone, Bradley, Calhoun and 49 more	7 hr
Jul 23, 1:27 PM CDT	Mesoscale Discussion	SPC	Clay, Craighead, Crittenden, Cross, Greene, Lawrence and 3 more	63 min
Jul 23, 1:37 PM CDT	Severe Thunderstorm Watch	SPC	Clay, Craighead, Crittenden, Cross, Greene, Lawrence and 4 more	4 hr
Jul 23, 3:01 PM CDT	Mesoscale Discussion	SPC	Baxter, Clark, Cleburne, Conway, Craighead, Crawford and 46 more	89 min
Jul 23, 4:04 PM CDT	Severe Thunderstorm Watch	SPC	Columbia, Hempstead, Lafayette, Miller, Nevada	5 hr
Jul 23, 6:06 PM CDT	Mesoscale Discussion	SPC	Bradley, Calhoun, Cleveland, Columbia, Drew, Lafayette and 4 more	84 min
Jul 23, 6:29 PM CDT	Severe Thunderstorm Watch	SPC	Union	5 hr
Jul 23, 3:19 AM CDT	Mesoscale Discussion	SPC	Cheyenne, Decatur, Graham, Norton, Phillips, Rawlins and 4 more	116 min
Jul 23, 9:21 AM CDT	Mesoscale Discussion	SPC	Decatur, Graham, Norton, Rawlins	84 min
Jul 22, 7:41 PM CDT	Mesoscale Discussion	SPC	Adair, Clark, Knox, Lewis, Linn, Livingston and 5 more	94 min

Nearby

Mesoscale Discussions in Arkansas, 2014 Mesoscale Discussions in Oklahoma, 2014 Mesoscale Discussions in Missouri, 2014 Every 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.