Alert archive / Arkansas / Mesoscale Discussions in 2005

Mesoscale Discussion 2478

November 27, 200530 counties in Arkansas; 8 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Nov 27, 2005, 4:39 PM CST for 30 counties in Arkansas; 8 counties in Missouri. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued
Nov 27, 2005, 4:39 PM CST (22:39 UTC)
Expired
Nov 27, 2005, 6:15 PM CST
In force
96 min
Issued by
the Storm Prediction Center
All 38 counties

Arkansas County, AR, Bradley County, AR, Clay County, AR, Cleburne County, AR, Cleveland County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Desha County, AR, Drew County, AR, Faulkner County, AR, Greene County, AR, Independence County, AR, Jackson County, AR, Jefferson County, AR, Lawrence County, AR, Lee County, AR, Lincoln County, AR, Lonoke County, AR, Mississippi County, AR, Monroe County, AR, Phillips County, AR, Poinsett County, AR, Prairie County, AR, Pulaski County, AR, Randolph County, AR, Sharp County, AR, St. Francis County, AR, White County, AR, Woodruff County, AR, Butler County, MO, Carter County, MO, Dunklin County, MO, New Madrid County, MO, Pemiscot County, MO, Ripley County, MO, Stoddard County, MO, Wayne County, MO

The radar

The Little Rock radar (KLZK), 82 km from the middle of the area, began a volume at 22:42 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

Jackson, MS (KJAN), launched 12:00Z, 10.7 hours before the alert went out and 310 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, Jackson, MS at 12:00Z on 2005-11-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Jackson, MS at 12:00Z on 2005-11-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 171 square meters per square second.19395878Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
621 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
171 m²/s²
0-3 km storm-relative helicity
188 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
Nov 27, 1:48 PM CSTMesoscale DiscussionSPCCrawford, Franklin, Hempstead, Howard, Little River, Logan and 9 more117 min
Nov 27, 2:20 PM CSTTornado WatchSPCBaxter, Benton, Boone, Calhoun, Carroll, Clark and 40 more8 hr
Nov 27, 5:07 PM CSTMesoscale DiscussionSPCClark, Conway, Faulkner, Garland, Hempstead, Hot Spring and 14 more113 min
Nov 27, 12:36 PM CSTTornado WatchSPCBarton, Jasper, McDonald, Newton, Vernon7 hr
Nov 27, 2:50 PM CSTMesoscale DiscussionSPCAndrew, Barry, Barton, Bates, Benton, Boone and 50 more115 min
Nov 27, 3:05 PM CSTTornado WatchSPCAdair, Andrew, Atchison, Barry, Bates, Benton and 65 more7 hr
Nov 27, 3:29 PM CSTMesoscale DiscussionSPCAtchison2 hr
Nov 27, 5:58 PM CSTMesoscale DiscussionSPCAndrew, Barry, Bates, Benton, Boone, Buchanan and 52 more92 min

Nearby

Mesoscale Discussions in Arkansas, 2005Mesoscale Discussions in Missouri, 2005Every mesoscale discussion in 2005

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.