Alert archive / Arkansas / Mesoscale Discussions in 2009

Mesoscale Discussion 93

February 10, 200924 counties in Arkansas; 12 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Feb 10, 2009, 11:13 PM CST for 24 counties in Arkansas; 12 counties in Missouri. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued: Feb 10, 2009, 11:13 PM CST (05:13 UTC)
Expired: Feb 11, 2009, 12:45 AM CST
In force: 92 min
Issued by: the Storm Prediction Center

All 36 counties

Baxter County, AR, Boone County, AR, Cleburne County, AR, Conway County, AR, Faulkner County, AR, Fulton County, AR, Garland County, AR, Independence County, AR, Izard County, AR, Johnson County, AR, Logan County, AR, Marion County, AR, Montgomery County, AR, Newton County, AR, Perry County, AR, Pope County, AR, Pulaski County, AR, Randolph County, AR, Saline County, AR, Searcy County, AR, Sharp County, AR, Stone County, AR, Van Buren County, AR, Yell County, AR, Bollinger County, MO, Carter County, MO, Douglas County, MO, Howell County, MO, Oregon County, MO, Ozark County, MO, Reynolds County, MO, Ripley County, MO, Shannon County, MO, Texas County, MO, Wayne County, MO, Wright County, MO

The radar

The Little Rock radar (KLZK), 129 km from the middle of the area, began a volume at 05:15 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.

Tornado Watch 14Feb 10, 11:45 PM CST

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 5.2 hours before the alert went out and 179 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: 7 J/kg
Mixed-layer CIN: -98 J/kg
Mixed-layer LCL: 1210 m above ground
0-6 km bulk shear: 76 kt
0-1 km storm-relative helicity: 96 m²/s²
0-3 km storm-relative helicity: 177 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

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
Feb 10, 6:13 PM CST	Mesoscale Discussion	SPC	Crawford, Washington	92 min
Feb 10, 8:34 PM CST	Mesoscale Discussion	SPC	Conway, Crawford, Faulkner, Franklin, Garland, Hempstead and 19 more	86 min
Feb 10, 9:30 PM CST	Tornado Watch	SPC	Baxter, Benton, Boone, Carroll, Clark, Cleburne and 42 more	7 hr
Feb 10, 11:45 PM CST	Tornado Watch	SPC	Arkansas, Clay, Craighead, Crittenden, Cross, Greene and 12 more	6 hr
Feb 11, 12:37 AM CST	Mesoscale Discussion	SPC	Ashley, Bradley, Calhoun, Chicot, Cleveland, Desha and 3 more	53 min
Feb 11, 1:04 AM CST	Tornado Watch	SPC	Ashley, Bradley, Calhoun, Chicot, Cleveland, Desha and 3 more	5 hr
Feb 11, 2:30 AM CST	Mesoscale Discussion	SPC	Arkansas, Clay, Craighead, Crittenden, Cross, Fulton and 18 more	90 min
Feb 11, 4:01 AM CST	Mesoscale Discussion	SPC	Ashley, Bradley, Calhoun, Chicot, Cleveland, Columbia and 6 more	89 min
Feb 11, 5:26 AM CST	Mesoscale Discussion	SPC	Mississippi	64 min

Nearby

Mesoscale Discussions in Arkansas, 2009 Mesoscale Discussions in Missouri, 2009 Every mesoscale discussion in 2009

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.