Alert archive / Illinois / Mesoscale Discussions in 2007

Mesoscale Discussion 949

June 1, 20074 states

The Storm Prediction Center issued this mesoscale discussion at Jun 1, 2007, 11:09 AM CDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Jun 1, 2007, 11:09 AM CDT (16:09 UTC)
Expired
Jun 1, 2007, 1:15 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 64 counties

Benton County, IA, Buchanan County, IA, Cedar County, IA, Clinton County, IA, Delaware 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, Lee County, IA, Linn County, IA, Louisa County, IA, Muscatine County, IA, Poweshiek County, IA, Scott County, IA, Tama County, IA, Van Buren County, IA, Washington County, IA, Adams County, IL, Brown County, IL, Bureau County, IL, Calhoun County, IL, Carroll County, IL, Cass County, IL, Fulton County, IL, Greene County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Jo Daviess County, IL, Knox County, IL, Lee County, IL, Logan County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, Menard County, IL, Mercer County, IL, Morgan County, IL, Ogle County, IL, Peoria County, IL, Pike County, IL, Putnam County, IL, Rock Island County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Stark County, IL, Stephenson County, IL, Tazewell County, IL, Warren County, IL, Whiteside County, IL, Woodford County, IL, Clark County, MO, Lewis County, MO, Marion County, MO, Pike County, MO, Ralls County, MO, Lafayette County, WI

The radar

The Quad Cities radar (KDVN), 68 km from the middle of the area, began a volume at 16:10 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, 4.2 hours before the alert went out and 72 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 2007-06-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 259 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 2007-06-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 47 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
259 J/kg
Mixed-layer CIN
-43 J/kg
Mixed-layer LCL
871 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
47 m²/s²
0-3 km storm-relative helicity
77 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
Jun 1, 12:35 PM CDTTornado WatchSPCBoone, Bureau, Carroll, DeKalb, Fulton, Grundy and 23 more6 hr
Jun 1, 2:35 PM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, DeKalb, Henry, Jo Daviess and 11 more85 min
Jun 1, 12:04 AM CDTMesoscale DiscussionSPCBarry, Barton, Dade, Jasper, Lawrence, McDonald and 3 more116 min
Jun 1, 1:14 AM CDTSevere Thunderstorm WatchSPCBarry, Barton, Cedar, Christian, Dade, Greene and 8 more6 hr
Jun 1, 3:18 AM CDTMesoscale DiscussionSPCBarry, Barton, Bates, Cedar, Christian, Dade and 11 more87 min
Jun 1, 5:39 AM CDTMesoscale DiscussionSPCBarry, Barton, Bates, Benton, Cedar, Christian and 16 more66 min
Jun 1, 5:15 PM CDTSevere Thunderstorm WatchSPCBarry, Barton, Benton, Camden, Cedar, Christian and 17 more8 hr

Nearby

Mesoscale Discussions in Illinois, 2007Mesoscale Discussions in Iowa, 2007Mesoscale Discussions in Missouri, 2007Every mesoscale discussion in 2007

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.