Alert archive / Iowa / Mesoscale Discussions in 2014

Mesoscale Discussion 632

May 21, 201423 counties in Illinois; 27 counties in Iowa; 7 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at May 21, 2014, 1:27 AM CDT for 23 counties in Illinois; 27 counties in Iowa; 7 counties in Missouri. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued
May 21, 2014, 1:27 AM CDT (06:27 UTC)
Expired
May 21, 2014, 3:00 AM CDT
In force
93 min
Issued by
the Storm Prediction Center
Chance of a watch
20%
All 57 counties

Appanoose County, IA, Cedar County, IA, Clarke County, IA, Clinton County, IA, Davis County, IA, Decatur County, IA, Des Moines County, IA, Henry County, IA, Iowa County, IA, Jackson County, IA, Jefferson County, IA, Johnson County, IA, Keokuk County, IA, Lee County, IA, Louisa County, IA, Lucas County, IA, Mahaska County, IA, Marion County, IA, Monroe County, IA, Muscatine County, IA, Ringgold County, IA, Scott County, IA, Taylor County, IA, Van Buren County, IA, Wapello County, IA, Washington County, IA, Wayne County, IA, Bureau County, IL, Carroll County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Grundy County, IL, Henderson County, IL, Henry County, IL, Kane County, IL, Kendall County, IL, Knox County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, McHenry County, IL, Mercer County, IL, Ogle County, IL, Putnam County, IL, Rock Island County, IL, Stark County, IL, Warren County, IL, Whiteside County, IL, Will County, IL, Harrison County, MO, Mercer County, MO, Nodaway County, MO, Putnam County, MO, Schuyler County, MO, Scotland County, MO, Worth County, MO

The radar

The Quad Cities radar (KDVN), 103 km from the middle of the area, began a volume at 06:30 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

Davenport, (KDVN), launched 00:00Z, 6.5 hours before the alert went out and 109 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, Davenport, at 00:00Z on 2014-05-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1315 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, Davenport, at 00:00Z on 2014-05-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 27 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
1315 J/kg
Mixed-layer CIN
-5 J/kg
Mixed-layer LCL
1553 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
27 m²/s²
0-3 km storm-relative helicity
67 m²/s²
Significant tornado parameter
0.1
Supercell composite
2.1

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
May 20, 8:06 PM CDTMesoscale DiscussionSPCDeKalb, DuPage, Grundy, Kane, Kankakee, Kendall and 1 more84 min
May 20, 9:56 PM CDTMesoscale DiscussionSPCCarroll, DeKalb, DuPage, Jo Daviess, Kane, Kendall and 4 more94 min
May 20, 11:23 PM CDTMesoscale DiscussionSPCCook, Lake97 min
May 21, 11:54 AM CDTMesoscale DiscussionSPCIroquois, Vermilion3 hr
May 21, 1:40 PM CDTMesoscale DiscussionSPCAdams, Brown, Cass, Champaign, Christian, Clark and 27 more2 hr
May 21, 2:35 PM CDTSevere Thunderstorm WatchSPCChampaign, Clark, Coles, Cumberland, DeWitt, Douglas and 10 more5 hr
May 21, 3:12 PM CDTMesoscale DiscussionSPCBond, Calhoun, Champaign, Christian, Clark, Clay and 44 more2 hr
May 21, 5:03 PM CDTMesoscale DiscussionSPCEdwards, Franklin, Hamilton, Jefferson, Wabash, Washington and 2 more87 min
May 21, 5:28 PM CDTSevere Thunderstorm WatchSPCEdwards, Franklin, Gallatin, Hamilton, Hardin, Jefferson and 7 more13 hr
May 21, 6:50 PM CDTMesoscale DiscussionSPCChampaign, Clark, Douglas, Edgar, Vermilion85 min

Nearby

Mesoscale Discussions in Iowa, 2014Mesoscale Discussions in Illinois, 2014Mesoscale Discussions in Missouri, 2014Every mesoscale discussion in 2014

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.