Alert archive / Kansas / Mesoscale Discussions in 2008

Mesoscale Discussion 720

April 25, 20084 states

The Storm Prediction Center issued this mesoscale discussion at Apr 25, 2008, 12:55 AM CDT for 4 states. It was in force for 35 min.

The area

The outline as issued.

The facts

Issued
Apr 25, 2008, 12:55 AM CDT (05:55 UTC)
Expired
Apr 25, 2008, 1:30 AM CDT
In force
35 min
Issued by
the Storm Prediction Center
All 22 counties

Page County, IA, Atchison County, KS, Brown County, KS, Clay County, KS, Cloud County, KS, Doniphan County, KS, Jackson County, KS, Jefferson County, KS, Marshall County, KS, Mitchell County, KS, Nemaha County, KS, Ottawa County, KS, Pottawatomie County, KS, Riley County, KS, Washington County, KS, Andrew County, MO, Atchison County, MO, Holt County, MO, Nodaway County, MO, Nemaha County, NE, Pawnee County, NE, Richardson County, NE

The radar

The Topeka radar (KTWX), 78 km from the middle of the area, began a volume at 05:56 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

Topeka, KS (KTOP), launched 00:00Z, 5.9 hours before the alert went out and 110 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 2008-04-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 956 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 2008-04-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 140 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
956 J/kg
Mixed-layer CIN
-138 J/kg
Mixed-layer LCL
777 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
140 m²/s²
0-3 km storm-relative helicity
219 m²/s²
Significant tornado parameter
0.2
Supercell composite
1.3

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 25, 12:07 AM CDTSevere Thunderstorm WatchSPCAdair, Adams, Cass, Clarke, Dallas, Decatur and 15 more7 hr
Apr 25, 1:13 AM CDTTornado WatchSPCFremont, Montgomery, Page5 hr
Apr 25, 2:24 AM CDTMesoscale DiscussionSPCAdair, Adams, Cass, Clarke, Dallas, Decatur and 14 more66 min
Apr 25, 3:18 AM CDTMesoscale DiscussionSPCFremont, Montgomery, Page57 min
Apr 25, 4:22 AM CDTMesoscale DiscussionSPCAppanoose, Benton, Cedar, Clarke, Clinton, Davis and 31 more23 min
Apr 25, 4:51 AM CDTSevere Thunderstorm WatchSPCAppanoose, Benton, Black Hawk, Buchanan, Cedar, Clinton and 23 more5 hr
Apr 25, 9:10 AM CDTMesoscale DiscussionSPCClinton, Jackson, Scott65 min
Apr 25, 12:21 PM CDTMesoscale DiscussionSPCCedar, Clinton, Davis, Delaware, Des Moines, Henry and 14 more54 min
Apr 25, 1:27 PM CDTSevere Thunderstorm WatchSPCCedar, Clinton, Des Moines, Dubuque, Henry, Iowa and 12 more7 hr
Apr 25, 3:28 PM CDTMesoscale DiscussionSPCClinton, Louisa, Scott62 min
Apr 25, 3:41 PM CDTTornado WatchSPCCedar, Clinton, Des Moines, Dubuque, Jackson, Jones and 4 more4 hr
Apr 25, 5:18 PM CDTMesoscale DiscussionSPCClinton, Louisa, Scott57 min
Apr 25, 6:01 PM CDTMesoscale DiscussionSPCClinton, Louisa, Scott59 min
Apr 24, 8:55 PM CDTMesoscale DiscussionSPCCheyenne, Decatur, Gove, Graham, Logan, Norton and 6 more95 min
Apr 24, 10:20 PM CDTSevere Thunderstorm WatchSPCBrown, Clay, Cloud, Dickinson, Geary, Jackson and 14 more7 hr
Apr 24, 11:55 PM CDTMesoscale DiscussionSPCBrown, Clay, Cloud, Dickinson, Geary, Jackson and 14 more65 min
Apr 25, 5:39 AM CDTMesoscale DiscussionSPCAtchison, Brown, Doniphan, Jackson36 min
Apr 25, 6:38 AM CDTMesoscale DiscussionSPCAllen, Anderson, Bourbon, Chautauqua, Cherokee, Coffey and 17 more67 min
Apr 25, 2:15 PM CDTMesoscale DiscussionSPCBarry, Camden, Christian, Dallas, Dent, Douglas and 13 more90 min
Apr 25, 6:40 PM CDTMesoscale DiscussionSPCButler, Carter, Oregon, Reynolds, Ripley, Shannon and 1 more65 min
Apr 25, 6:06 AM CDTMesoscale DiscussionSPCAntelope, Blaine, Boyd, Brown, Garfield, Holt and 5 more6 hr

Nearby

Mesoscale Discussions in Kansas, 2008Mesoscale Discussions in Missouri, 2008Mesoscale Discussions in Nebraska, 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.