Alert archive / Kansas / Mesoscale Discussions in 2003

Mesoscale Discussion 642

April 30, 20034 states

The Storm Prediction Center issued this mesoscale discussion at Apr 30, 2003, 2:49 PM CDT for 4 states. It was in force for 116 min.

The area

The outline as issued.

The facts

Issued
Apr 30, 2003, 2:49 PM CDT (19:49 UTC)
Expired
Apr 30, 2003, 4:45 PM CDT
In force
116 min
Issued by
the Storm Prediction Center
All 45 counties

Appanoose County, IA, Clarke County, IA, Decatur County, IA, Lucas County, IA, Monroe County, IA, Page County, IA, Ringgold County, IA, Taylor County, IA, Wayne County, IA, Atchison County, KS, Brown County, KS, Clay County, KS, Dickinson County, KS, Doniphan County, KS, Geary County, KS, Jackson County, KS, Jefferson County, KS, Leavenworth County, KS, Lyon County, KS, Marshall County, KS, Morris County, KS, Nemaha County, KS, Osage County, KS, Pottawatomie County, KS, Riley County, KS, Shawnee County, KS, Wabaunsee County, KS, Washington County, KS, Andrew County, MO, Atchison County, MO, Buchanan County, MO, Daviess County, MO, DeKalb County, MO, Gentry County, MO, Grundy County, MO, Harrison County, MO, Holt County, MO, Mercer County, MO, Nodaway County, MO, Putnam County, MO, Worth County, MO, Johnson County, NE, Nemaha County, NE, Pawnee County, NE, Richardson County, NE

The radar

The Pleasant Hill radar (KEAX), 147 km from the middle of the area, began a volume at 19:52 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 12:00Z, 7.8 hours before the alert went out and 127 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 12:00Z on 2003-04-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 758 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 12:00Z on 2003-04-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 284 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
758 J/kg
Mixed-layer CIN
-361 J/kg
Mixed-layer LCL
980 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
284 m²/s²
0-3 km storm-relative helicity
293 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 29, 7:00 PM CDTMesoscale DiscussionSPCAdair, Adams, Audubon, Boone, Carroll, Cass and 13 more3 hr
Apr 29, 7:30 PM CDTSevere Thunderstorm WatchSPCAdair, Adams, Audubon, Boone, Carroll, Cass and 17 more7 hr
Apr 29, 10:40 PM CDTMesoscale DiscussionSPCAdair, Adams, Audubon, Boone, Carroll, Cass and 17 more2 hr
Apr 30, 11:04 AM CDTMesoscale DiscussionSPCCedar, Clinton, Dubuque, Jackson, Jones, Scott116 min
Apr 30, 12:22 PM CDTMesoscale DiscussionSPCDes Moines, Henry, Lee113 min
Apr 30, 1:00 PM CDTSevere Thunderstorm WatchSPCDes Moines, Louisa, Muscatine, Scott5 hr
Apr 30, 3:24 PM CDTMesoscale DiscussionSPCDes Moines, Louisa, Muscatine2 hr
Apr 30, 5:15 PM CDTTornado WatchSPCAppanoose, Cedar, Clarke, Clinton, Davis, Decatur and 23 more6 hr
Apr 29, 7:56 PM CDTMesoscale DiscussionSPCClay, Cloud, Decatur, Graham, Jewell, Mitchell and 10 more2 hr
Apr 29, 8:45 PM CDTSevere Thunderstorm WatchSPCBrown, Cheyenne, Clay, Cloud, Decatur, Dickinson and 29 more5 hr
Apr 29, 10:29 PM CDTMesoscale DiscussionSPCBrown, Cheyenne, Clay, Cloud, Decatur, Dickinson and 28 more2 hr
Apr 30, 1:22 AM CDTMesoscale DiscussionSPCDecatur, Norton, Phillips, Rawlins113 min
Apr 30, 1:49 AM CDTMesoscale DiscussionSPCDecatur, Norton, Phillips, Rawlins116 min
Apr 30, 3:28 PM CDTMesoscale DiscussionSPCGreeley, Wallace, Wichita92 min
Apr 30, 6:29 PM CDTMesoscale DiscussionSPCButler, Chase, Coffey, Cowley, Elk, Franklin and 11 more91 min

Nearby

Mesoscale Discussions in Kansas, 2003Mesoscale Discussions in Missouri, 2003Mesoscale Discussions in Iowa, 2003Every mesoscale discussion in 2003

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.