Alert archive / Illinois / Mesoscale Discussions in 2015

Mesoscale Discussion 744

May 24, 201523 counties in Illinois; 23 counties in Iowa; Clark County, Scotland County, Missouri

The Storm Prediction Center issued this mesoscale discussion at May 24, 2015, 3:34 PM CDT for 23 counties in Illinois; 23 counties in Iowa; Clark County, Scotland County, Missouri. It was in force for 56 min.

The area

The outline as issued.

The facts

Issued
May 24, 2015, 3:34 PM CDT (20:34 UTC)
Expired
May 24, 2015, 4:30 PM CDT
In force
56 min
Issued by
the Storm Prediction Center
Chance of a watch
40%
All 48 counties

Benton County, IA, Cedar County, IA, Clinton County, IA, Davis County, IA, Des Moines County, IA, Henry County, IA, Iowa County, IA, Jackson County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Lee County, IA, Linn County, IA, Louisa County, IA, Mahaska County, IA, Muscatine County, IA, Poweshiek County, IA, Scott County, IA, Tama County, IA, Van Buren County, IA, Wapello County, IA, Washington County, IA, Bureau County, IL, Carroll County, IL, Fulton County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Knox County, IL, LaSalle County, IL, Lee County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, Mercer County, IL, Ogle County, IL, Peoria County, IL, Putnam County, IL, Rock Island County, IL, Schuyler County, IL, Stark County, IL, Tazewell County, IL, Warren County, IL, Whiteside County, IL, Woodford County, IL, Clark County, MO, Scotland County, MO

The radar

The Quad Cities radar (KDVN), 24 km from the middle of the area, began a volume at 20:34 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, 8.6 hours before the alert went out and 30 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 2015-05-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2015-05-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 175 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1494 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
175 m²/s²
0-3 km storm-relative helicity
206 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 24, 4:14 PM CDTTornado WatchSPCAdams, Alexander, Bond, Brown, Calhoun, Clinton and 16 more8 hr
May 24, 5:34 PM CDTTornado WatchSPCBoone, Bureau, Carroll, Cass, Christian, DeKalb and 36 more7 hr
May 24, 6:04 PM CDTMesoscale DiscussionSPCAlexander, Calhoun, Greene, Jackson, Jersey, Madison and 6 more116 min
May 24, 6:41 PM CDTMesoscale DiscussionSPCBureau, Carroll, Cass, Fulton, Grundy, Hancock and 22 more94 min
May 23, 10:49 PM CDTMesoscale DiscussionSPCMcDonald, Newton86 min
May 24, 12:54 PM CDTMesoscale DiscussionSPCAudrain, Benton, Boone, Callaway, Camden, Chariton and 34 more96 min
May 24, 1:18 PM CDTTornado WatchSPCAdair, Audrain, Benton, Boone, Callaway, Camden and 56 more6 hr

Nearby

Mesoscale Discussions in Illinois, 2015Mesoscale Discussions in Iowa, 2015Mesoscale Discussions in Missouri, 2015Every mesoscale discussion in 2015

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.