Alert archive / Arkansas / Mesoscale Discussions in 2004

Mesoscale Discussion 435

April 22, 20044 states

The Storm Prediction Center issued this mesoscale discussion at Apr 22, 2004, 6:23 PM CDT for 4 states. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued
Apr 22, 2004, 6:23 PM CDT (23:23 UTC)
Expired
Apr 22, 2004, 7:30 PM CDT
In force
67 min
Issued by
the Storm Prediction Center
All 37 counties

Boone County, AR, Carroll County, AR, Crawford County, AR, Franklin County, AR, Howard County, AR, Johnson County, AR, Logan County, AR, Madison County, AR, Montgomery County, AR, Newton County, AR, Pike County, AR, Polk County, AR, Scott County, AR, Sebastian County, AR, Sevier County, AR, Washington County, AR, Yell County, AR, Barry County, MO, Stone County, MO, Taney County, MO, Adair County, OK, Carter County, OK, Garvin County, OK, Hughes County, OK, LeFlore County, OK, Mayes County, OK, McCurtain County, OK, McIntosh County, OK, Murray County, OK, Muskogee County, OK, Okfuskee County, OK, Okmulgee County, OK, Pontotoc County, OK, Pottawatomie County, OK, Seminole County, OK, Wagoner County, OK, Lamar County, TX

The radar

The Western Arkansas radar (KSRX), 90 km from the middle of the area, began a volume at 23:24 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

Norman, OK (KOUN), launched 12:00Z, 11.4 hours before the alert went out and 187 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, Norman, OK at 12:00Z on 2004-04-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 900 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, Norman, OK at 12:00Z on 2004-04-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 232 square meters per square second.1939587897Sfc1 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
900 J/kg
Mixed-layer CIN
-89 J/kg
Mixed-layer LCL
473 m above ground
0-6 km bulk shear
78 kt
0-1 km storm-relative helicity
232 m²/s²
0-3 km storm-relative helicity
312 m²/s²
Significant tornado parameter
0.0
Supercell composite
5.3

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
Apr 21, 7:01 PM CDTMesoscale DiscussionSPCClay, Craighead, Crittenden, Cross, Greene, Lawrence and 6 more119 min
Apr 21, 8:12 PM CDTMesoscale DiscussionSPCArkansas, Ashley, Baxter, Benton, Boone, Bradley and 52 more63 min
Apr 21, 10:10 PM CDTMesoscale DiscussionSPCBenton, Washington95 min
Apr 21, 10:50 PM CDTSevere Thunderstorm WatchSPCCrawford, Sebastian5 hr
Apr 22, 1:43 AM CDTMesoscale DiscussionSPCCrawford, Logan, Sebastian92 min
Apr 22, 12:32 PM CDTMesoscale DiscussionSPCBenton, Washington88 min
Apr 22, 1:40 PM CDTTornado WatchSPCBenton, Boone, Carroll, Crawford, Franklin, Howard and 12 more6 hr
Apr 22, 3:26 PM CDTMesoscale DiscussionSPCCrawford, Franklin, Johnson, Logan, Madison, Newton and 6 more64 min
Apr 22, 5:27 PM CDTMesoscale DiscussionSPCBenton, Boone, Carroll, Crawford, Franklin, Howard and 12 more63 min
Apr 21, 7:06 PM CDTMesoscale DiscussionSPCAlfalfa, Beaver, Blaine, Dewey, Ellis, Harper and 3 more2 hr
Apr 21, 7:51 PM CDTMesoscale DiscussionSPCAlfalfa, Blaine, Choctaw, Cleveland, Creek, Delaware and 18 more84 min
Apr 21, 8:35 PM CDTSevere Thunderstorm WatchSPCAlfalfa, Blaine, Dewey, Ellis, Garfield, Grant and 9 more5 hr
Apr 21, 8:35 PM CDTTornado WatchSPCAtoka, Bryan, Choctaw, Coal, Haskell, Hughes and 6 more5 hr
Apr 21, 10:26 PM CDTMesoscale DiscussionSPCAtoka, Bryan, Choctaw, Coal, Haskell, Hughes and 7 more64 min
Apr 21, 10:56 PM CDTMesoscale DiscussionSPCAlfalfa, Garfield, Grant, Kay, Kingfisher, Logan and 2 more94 min
Apr 22, 4:30 PM CDTTornado WatchSPCBryan, Love6 hr
Apr 22, 3:15 PM CDTMesoscale DiscussionSPCCollin, Cooke, Dallas, Denton, Fannin, Grayson and 8 more3 hr

Nearby

Mesoscale Discussions in Arkansas, 2004Mesoscale Discussions in Oklahoma, 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.