Alert archive / Oklahoma / Mesoscale Discussions in 2008

Mesoscale Discussion 689

April 22, 20085 counties in Arkansas; 8 counties in Missouri; 30 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Apr 22, 2008, 3:30 PM CDT for 5 counties in Arkansas; 8 counties in Missouri; 30 counties in Oklahoma. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued
Apr 22, 2008, 3:30 PM CDT (20:30 UTC)
Expired
Apr 22, 2008, 5:00 PM CDT
In force
90 min
Issued by
the Storm Prediction Center
All 43 counties

Benton County, AR, Carroll County, AR, Crawford County, AR, Madison County, AR, Washington County, AR, Barry County, MO, Christian County, MO, Greene County, MO, Lawrence County, MO, McDonald County, MO, Newton County, MO, Stone County, MO, Taney County, MO, Adair County, OK, Atoka County, OK, Carter County, OK, Cherokee County, OK, Cleveland County, OK, Coal County, OK, Delaware County, OK, Garvin County, OK, Haskell County, OK, Hughes County, OK, Johnston County, OK, Latimer County, OK, LeFlore County, OK, Mayes County, OK, McClain County, OK, McIntosh County, OK, Murray County, OK, Muskogee County, OK, Okfuskee County, OK, Okmulgee County, OK, Ottawa County, OK, Pittsburg County, OK, Pontotoc County, OK, Pottawatomie County, OK, Pushmataha County, OK, Rogers County, OK, Seminole County, OK, Sequoyah County, OK, Tulsa County, OK, Wagoner County, OK

The radar

The Western Arkansas radar (KSRX), 80 km from the middle of the area, began a volume at 20:33 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 nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 8.5 hours before the alert went out and 201 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 2008-04-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2707 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 2008-04-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 161 square meters per square second.193958Sfc1 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
2707 J/kg
Mixed-layer CIN
-159 J/kg
Mixed-layer LCL
818 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
161 m²/s²
0-3 km storm-relative helicity
199 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.7

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, 12:16 PM CDTMesoscale DiscussionSPCArkansas, Baxter, Benton, Boone, Carroll, Clark and 48 more89 min
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, 3:52 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 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 Oklahoma, 2008Mesoscale Discussions in Missouri, 2008Mesoscale Discussions in Arkansas, 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.