Alert archive / Iowa / Mesoscale Discussions in 2014

Mesoscale Discussion 563

May 11, 20146 counties in Illinois; 20 counties in Iowa

The Storm Prediction Center issued this mesoscale discussion at May 11, 2014, 12:51 PM CDT for 6 counties in Illinois; 20 counties in Iowa. It was in force for 54 min.

The area

The outline as issued.

The facts

Issued
May 11, 2014, 12:51 PM CDT (17:51 UTC)
Expired
May 11, 2014, 1:45 PM CDT
In force
54 min
Issued by
the Storm Prediction Center
All 26 counties

Appanoose County, IA, Cedar County, IA, Clinton County, IA, Davis County, IA, Des Moines County, IA, Dubuque County, IA, Henry County, IA, Iowa County, IA, Jackson County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Louisa County, IA, Monroe County, IA, Muscatine County, IA, Scott County, IA, Van Buren County, IA, Wapello County, IA, Washington County, IA, Carroll County, IL, Henderson County, IL, Jo Daviess County, IL, Mercer County, IL, Rock Island County, IL, Whiteside County, IL

The radar

The Quad Cities radar (KDVN), 81 km from the middle of the area, began a volume at 17:53 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

Davenport, (KDVN), launched 12:00Z, 5.9 hours before the alert went out and 88 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 12:00Z on 2014-05-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 52 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 12:00Z on 2014-05-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 140 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
52 J/kg
Mixed-layer CIN
-261 J/kg
Mixed-layer LCL
1382 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
140 m²/s²
0-3 km storm-relative helicity
162 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
May 10, 7:55 PM CDTMesoscale DiscussionSPCCalhoun, Greene, Jersey, Macoupin, Madison, Monroe and 2 more95 min
May 10, 10:22 PM CDTMesoscale DiscussionSPCCalhoun, Jersey, Madison, Monroe, Randolph, Saint Clair83 min
May 11, 9:16 AM CDTMesoscale DiscussionSPCMercer, Rock Island89 min
May 11, 10:47 AM CDTMesoscale DiscussionSPCHancock118 min
May 11, 11:53 AM CDTTornado WatchSPCCarroll, Henderson, Henry, Mercer, Rock Island, Warren and 1 more7 hr
May 11, 2:36 PM CDTMesoscale DiscussionSPCMercer84 min
May 11, 3:05 PM CDTSevere Thunderstorm WatchSPCBoone, Bureau, Cook, DeKalb, DuPage, Ford and 23 more7 hr
May 11, 5:09 PM CDTMesoscale DiscussionSPCBoone, Bureau, Cook, DeKalb, DuPage, Grundy and 21 more66 min
May 11, 5:49 PM CDTMesoscale DiscussionSPCClark, Coles, Edgar56 min
May 11, 1:19 AM CDTMesoscale DiscussionSPCAdams, Cass, Fremont, Harrison, Mills, Montgomery and 3 more2 hr
May 11, 2:58 AM CDTSevere Thunderstorm WatchSPCFremont, Mills, Montgomery, Page, Pottawattamie7 hr
May 11, 7:02 AM CDTMesoscale DiscussionSPCFremont, Mills, Montgomery, Page, Pottawattamie118 min
May 11, 12:49 PM CDTMesoscale DiscussionSPCAdams, Cass, Fremont, Mills, Montgomery, Page and 2 more116 min
May 11, 2:21 PM CDTTornado WatchSPCAdair, Adams, Audubon, Cass, Fremont, Harrison and 8 more8 hr
May 11, 6:23 PM CDTMesoscale DiscussionSPCAdair, Adams, Cass, Fremont, Mills, Montgomery and 5 more67 min

Nearby

Mesoscale Discussions in Iowa, 2014Mesoscale Discussions in Illinois, 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.