Alert archive / Arkansas / Mesoscale Discussions in 2012

Mesoscale Discussion 2024

October 5, 201229 counties in Arkansas

The Storm Prediction Center issued this mesoscale discussion at Oct 5, 2012, 11:16 AM CDT for 29 counties in Arkansas. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued: Oct 5, 2012, 11:16 AM CDT (16:16 UTC)
Expired: Oct 5, 2012, 1:15 PM CDT
In force: 119 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

All 29 counties

Baxter County, AR, Clay County, AR, Cleburne County, AR, Conway County, AR, Craighead County, AR, Faulkner 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, Montgomery County, AR, Newton County, AR, Perry County, AR, Poinsett County, AR, Polk County, AR, Pope County, AR, Randolph County, AR, Scott County, AR, Searcy County, AR, Sharp County, AR, Stone County, AR, Van Buren County, AR, White County, AR, Yell County, AR

The radar

The Little Rock radar (KLZK), 103 km from the middle of the area, began a volume at 16:16 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 nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 4.3 hours before the alert went out and 194 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 753 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 271 m²/s²
0-3 km storm-relative helicity: 323 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

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
Oct 4, 10:54 PM CDT	Mesoscale Discussion	SPC	Benton	3 hr
Oct 5, 4:29 PM CDT	Mesoscale Discussion	SPC	Arkansas, Clark, Crittenden, Cross, Faulkner, Garland and 18 more	2 hr

Nearby

Mesoscale Discussions in Arkansas, 2012 Every mesoscale discussion in 2012

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.