Alert archive / Kansas / Mesoscale Discussions in 2008

Mesoscale Discussion 681

April 21, 200835 counties in Kansas; 6 counties in Missouri; 7 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Apr 21, 2008, 10:38 PM CDT for 35 counties in Kansas; 6 counties in Missouri; 7 counties in Oklahoma. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Apr 21, 2008, 10:38 PM CDT (03:38 UTC)
Expired
Apr 22, 2008, 12:45 AM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 48 counties

Allen County, KS, Anderson County, KS, Atchison County, KS, Brown County, KS, Butler County, KS, Chase County, KS, Chautauqua County, KS, Coffey County, KS, Cowley County, KS, Doniphan County, KS, Douglas County, KS, Elk County, KS, Franklin County, KS, Greenwood County, KS, Harvey County, KS, Jackson County, KS, Jefferson County, KS, Labette County, KS, Leavenworth County, KS, Lyon County, KS, Marion County, KS, Montgomery County, KS, Morris County, KS, Nemaha County, KS, Neosho County, KS, Osage County, KS, Pottawatomie County, KS, Riley County, KS, Sedgwick County, KS, Shawnee County, KS, Sumner County, KS, Wabaunsee County, KS, Wilson County, KS, Woodson County, KS, Wyandotte County, KS, Andrew County, MO, Buchanan County, MO, Clinton County, MO, DeKalb County, MO, Holt County, MO, Platte County, MO, Garfield County, OK, Grant County, OK, Kay County, OK, Noble County, OK, Osage County, OK, Pawnee County, OK, Washington County, OK

The radar

The Topeka radar (KTWX), 68 km from the middle of the area, began a volume at 03:40 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

Topeka, KS (KTOP), launched 00:00Z, 3.6 hours before the alert went out and 80 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, Topeka, KS at 00:00Z on 2008-04-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1388 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, Topeka, KS at 00:00Z on 2008-04-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 36 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
1388 J/kg
Mixed-layer CIN
-15 J/kg
Mixed-layer LCL
1301 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
36 m²/s²
0-3 km storm-relative helicity
74 m²/s²
Significant tornado parameter
0.2
Supercell composite
1.9

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, 7:03 PM CDTSevere Thunderstorm WatchSPCAllen, Anderson, Atchison, Brown, Butler, Chase and 29 more7 hr
Apr 22, 1:14 AM CDTMesoscale DiscussionSPCAllen, Anderson, Bourbon, Cherokee, Crawford, Franklin and 6 more91 min
Apr 22, 7:42 AM CDTMesoscale DiscussionSPCBarry, Carter, Christian, Douglas, Greene, Howell and 10 more63 min
Apr 22, 7:49 AM CDTSevere Thunderstorm WatchSPCBarry, Christian, Dent, Douglas, Greene, Howell and 11 more6 hr
Apr 22, 9:41 AM CDTMesoscale DiscussionSPCCape Girardeau, Perry, Scott94 min
Apr 22, 10:12 AM CDTMesoscale DiscussionSPCBarry, Christian, Douglas, Howell, McDonald, Oregon and 3 more93 min
Apr 22, 10:47 AM CDTSevere Thunderstorm WatchSPCDunklin, Pemiscot5 hr
Apr 22, 12:16 PM CDTMesoscale DiscussionSPCDunklin, Ozark, Pemiscot, Taney89 min
Apr 22, 2:06 PM CDTSevere Thunderstorm WatchSPCBarry, Christian, Lawrence, McDonald, Newton, Stone and 1 more7 hr
Apr 22, 3:30 PM CDTMesoscale DiscussionSPCBarry, Christian, Greene, Lawrence, McDonald, Newton and 2 more90 min
Apr 22, 6:51 PM CDTMesoscale DiscussionSPCBarry, Christian, Greene, McDonald, Newton, Stone114 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
Apr 22, 2:33 PM CDTSevere Thunderstorm WatchSPCMcCurtain6 hr

Nearby

Mesoscale Discussions in Kansas, 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.