Alert archive / Arkansas / Mesoscale Discussions in 2004

Mesoscale Discussion 2387

November 1, 200424 counties in Arkansas; 8 parishes in Louisiana; 5 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Nov 1, 2004, 9:17 AM CST for 24 counties in Arkansas; 8 parishes in Louisiana; 5 counties in Missouri. It was in force for 118 min.

The area

The outline as issued.

The facts

Issued
Nov 1, 2004, 9:17 AM CST (15:17 UTC)
Expired
Nov 1, 2004, 11:15 AM CST
In force
118 min
Issued by
the Storm Prediction Center
All 37 counties

Bradley County, AR, Calhoun County, AR, Cleburne County, AR, Cleveland County, AR, Columbia County, AR, Dallas County, AR, Faulkner County, AR, Fulton County, AR, Grant County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Jefferson County, AR, Lawrence County, AR, Lonoke County, AR, Ouachita County, AR, Prairie County, AR, Pulaski County, AR, Randolph County, AR, Saline County, AR, Sharp County, AR, Stone County, AR, Union County, AR, White County, AR, Bienville Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Lincoln Parish, LA, Natchitoches Parish, LA, Red River Parish, LA, Sabine Parish, LA, Webster Parish, LA, Carter County, MO, Oregon County, MO, Reynolds County, MO, Ripley County, MO, Shannon County, MO

The radar

The Little Rock radar (KLZK), 35 km from the middle of the area, began a volume at 15:19 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

Little Rock, AR (KLZK), launched 12:00Z, 3.3 hours before the alert went out and 212 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, Little Rock, AR at 12:00Z on 2004-11-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 362 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, Little Rock, AR at 12:00Z on 2004-11-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 252 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
362 J/kg
Mixed-layer CIN
-15 J/kg
Mixed-layer LCL
631 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
252 m²/s²
0-3 km storm-relative helicity
264 m²/s²
Significant tornado parameter
0.5
Supercell composite
2.6

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 1, 10:00 AM CSTTornado WatchSPCArkansas, Ashley, Bradley, Calhoun, Cleveland, Cross and 16 more6 hr
Nov 1, 1:11 PM CSTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Chicot, Cleveland, Cross and 8 more94 min
Nov 1, 2:35 PM CSTTornado WatchSPCCrittenden, Cross, Desha, Lee, Mississippi, Phillips and 2 more5 hr
Nov 1, 5:57 PM CSTMesoscale DiscussionSPCCrittenden, Cross, Desha, Lee, Mississippi, Phillips and 2 more2 hr
Nov 1, 2:25 PM CSTMesoscale DiscussionSPCDunklin, Mississippi, New Madrid, Pemiscot95 min

Nearby

Mesoscale Discussions in Arkansas, 2004Mesoscale Discussions in Louisiana, 2004Mesoscale Discussions in Missouri, 2004Every mesoscale discussion in 2004

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.