Alert archive / Arkansas / Mesoscale Discussions in 2008

Mesoscale Discussion 686

April 22, 20085 states

The Storm Prediction Center issued this mesoscale discussion at Apr 22, 2008, 12:16 PM CDT for 5 states. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued
Apr 22, 2008, 12:16 PM CDT (17:16 UTC)
Expired
Apr 22, 2008, 1:45 PM CDT
In force
89 min
Issued by
the Storm Prediction Center
All 70 counties

Arkansas County, AR, Baxter County, AR, Benton County, AR, Boone County, AR, Carroll County, AR, Clark County, AR, Cleburne County, AR, Conway County, AR, Craighead County, AR, Crawford County, AR, Crittenden County, AR, Cross County, AR, Faulkner County, AR, Franklin County, AR, Fulton County, AR, Garland County, AR, Grant County, AR, Greene County, AR, Hot Spring County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Jefferson County, AR, Johnson County, AR, Lawrence County, AR, Lee County, AR, Logan County, AR, Lonoke County, AR, Madison County, AR, Marion County, AR, Mississippi County, AR, Monroe County, AR, Montgomery County, AR, Newton County, AR, Perry County, AR, Phillips County, AR, Pike County, AR, Poinsett County, AR, Polk County, AR, Pope County, AR, Prairie County, AR, Pulaski County, AR, Saline County, AR, Scott County, AR, Searcy County, AR, Sebastian County, AR, Sharp County, AR, St. Francis County, AR, Stone County, AR, Van Buren County, AR, Washington County, AR, White County, AR, Woodruff County, AR, Yell County, AR, Dunklin County, MO, Ozark County, MO, Pemiscot County, MO, Taney County, MO, DeSoto County, MS, Tunica County, MS, Adair County, OK, Cherokee County, OK, Delaware County, OK, Haskell County, OK, LeFlore County, OK, Sequoyah County, OK, Dyer County, TN, Lauderdale County, TN, Shelby County, TN, Tipton County, TN

The radar

The Little Rock radar (KLZK), 90 km from the middle of the area, began a volume at 17:19 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

Springfield, MO (KSGF), launched 12:00Z, 5.3 hours before the alert went out and 210 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, Springfield, MO at 12:00Z on 2008-04-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2654 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, Springfield, MO at 12:00Z on 2008-04-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 374 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
2654 J/kg
Mixed-layer CIN
-31 J/kg
Mixed-layer LCL
645 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
374 m²/s²
0-3 km storm-relative helicity
353 m²/s²
Significant tornado parameter
0.0
Supercell composite
13.7

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 22, 7:42 AM CDTMesoscale DiscussionSPCBaxter, Benton, Boone, Carroll, Fulton, Izard and 8 more63 min
Apr 22, 7:49 AM CDTSevere Thunderstorm WatchSPCBaxter, Benton, Boone, Carroll, Crawford, Franklin and 10 more6 hr
Apr 22, 10:12 AM CDTMesoscale DiscussionSPCBaxter, Benton, Boone, Carroll, Cleburne, Conway and 31 more93 min
Apr 22, 10:47 AM CDTSevere Thunderstorm WatchSPCArkansas, Clark, Cleburne, Cleveland, Conway, Craighead and 40 more5 hr
Apr 22, 1:51 PM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 25 more54 min
Apr 22, 2:06 PM CDTSevere Thunderstorm WatchSPCBenton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more7 hr
Apr 22, 2:33 PM CDTSevere Thunderstorm WatchSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 35 more6 hr
Apr 22, 3:30 PM CDTMesoscale DiscussionSPCBenton, Carroll, Crawford, Madison, Washington90 min
Apr 22, 3:52 PM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 26 more83 min
Apr 22, 6:51 PM CDTMesoscale DiscussionSPCBenton, Carroll, Crawford, Garland, Logan, Madison and 7 more114 min
Apr 22, 4:06 PM CDTMesoscale DiscussionSPCAdams, Amite, Claiborne, Copiah, Franklin, Hinds and 12 more2 hr
Apr 21, 7:03 PM CDTSevere Thunderstorm WatchSPCAndrew, Buchanan, Clinton, DeKalb, Holt, Platte7 hr
Apr 21, 10:38 PM CDTMesoscale DiscussionSPCAndrew, Buchanan, Clinton, DeKalb, Holt, Platte2 hr
Apr 22, 1:14 AM CDTMesoscale DiscussionSPCBarton, Bates, Caldwell, Cass, Cedar, Clay and 10 more91 min
Apr 22, 9:41 AM CDTMesoscale DiscussionSPCCape Girardeau, Perry, Scott94 min
Apr 21, 7:34 PM CDTMesoscale DiscussionSPCCarter, Cleveland, Creek, Garfield, Garvin, Kingfisher and 9 more86 min
Apr 21, 8:56 PM CDTTornado WatchSPCCarter, Cleveland, Coal, Creek, Garvin, Hughes and 11 more5 hr
Apr 21, 10:29 PM CDTMesoscale DiscussionSPCCarter, Cleveland, Coal, Creek, Garvin, Hughes and 11 more91 min

Nearby

Mesoscale Discussions in Arkansas, 2008Mesoscale Discussions in Oklahoma, 2008Mesoscale Discussions in Missouri, 2008Every mesoscale discussion in 2008

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.