Alert archive / Illinois / Mesoscale Discussions in 2007

Mesoscale Discussion 236

March 1, 200734 counties in Illinois; 18 counties in Indiana; Berrien County, Michigan

The Storm Prediction Center issued this mesoscale discussion at Mar 1, 2007, 10:24 AM CST for 34 counties in Illinois; 18 counties in Indiana; Berrien County, Michigan. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued
Mar 1, 2007, 10:24 AM CST (16:24 UTC)
Expired
Mar 1, 2007, 12:00 PM CST
In force
96 min
Issued by
the Storm Prediction Center
All 53 counties

Brown County, IL, Bureau County, IL, Cass County, IL, Cook County, IL, DeKalb County, IL, DeWitt County, IL, DuPage County, IL, Ford County, IL, Fulton County, IL, Grundy County, IL, Henry County, IL, Iroquois County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Knox County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Logan County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, McLean County, IL, Menard County, IL, Morgan County, IL, Peoria County, IL, Putnam County, IL, Sangamon County, IL, Schuyler County, IL, Stark County, IL, Tazewell County, IL, Will County, IL, Woodford County, IL, Benton County, IN, Carroll County, IN, Cass County, IN, Fulton County, IN, Jasper County, IN, Kosciusko County, IN, Lake County, IN, LaPorte County, IN, Marshall County, IN, Miami County, IN, Newton County, IN, Porter County, IN, Pulaski County, IN, Saint Joseph County, IN, Starke County, IN, Tippecanoe County, IN, Warren County, IN, White County, IN, Berrien County, MI

The radar

The Chicago radar (KLOT), 69 km from the middle of the area, began a volume at 16:23 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

Lincoln, IL (KILX), launched 12:00Z, 4.4 hours before the alert went out and 98 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, Lincoln, IL at 12:00Z on 2007-03-01Temperature 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, Lincoln, IL at 12:00Z on 2007-03-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 162 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
784 m above ground
0-6 km bulk shear
65 kt
0-1 km storm-relative helicity
162 m²/s²
0-3 km storm-relative helicity
151 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
Feb 28, 10:30 PM CSTMesoscale DiscussionSPCAdams, Brown, Cass, Fulton, Hancock, Henderson and 5 more90 min
Feb 28, 11:48 PM CSTMesoscale DiscussionSPCAdams, Brown, Calhoun, Cass, Greene, Jersey and 5 more57 min
Mar 1, 12:12 AM CSTMesoscale DiscussionSPCAlexander, Jackson, Johnson, Massac, Pope, Pulaski and 2 more2 hr
Mar 1, 12:16 AM CSTSevere Thunderstorm WatchSPCAdams, Brown, Calhoun, Cass, Christian, Greene and 11 more6 hr
Mar 1, 1:05 AM CSTSevere Thunderstorm WatchSPCGallatin, Hardin, Johnson, Massac, Pope, Pulaski and 1 more7 hr
Mar 1, 2:28 AM CSTMesoscale DiscussionSPCAdams, Brown, Calhoun, Cass, Christian, Greene and 11 more92 min
Mar 1, 3:35 AM CSTMesoscale DiscussionSPCClinton, Jackson, Monroe, Perry, Randolph, Saint Clair and 1 more55 min
Mar 1, 3:58 AM CSTTornado WatchSPCAlexander, Bond, Clinton, Fayette, Franklin, Jackson and 10 more8 hr
Mar 1, 4:18 AM CSTMesoscale DiscussionSPCGallatin, Hardin, Johnson, Massac, Pope, Saline117 min
Mar 1, 8:40 AM CSTTornado WatchSPCChampaign, Christian, Clark, Clay, Coles, Crawford and 27 more9 hr
Mar 1, 11:25 AM CSTSevere Thunderstorm WatchSPCBoone, Bureau, Cook, DeKalb, DuPage, Ford and 23 more6 hr
Mar 1, 12:48 PM CSTMesoscale DiscussionSPCChampaign, Clark, Clay, Coles, Crawford, Cumberland and 28 more117 min
Mar 1, 1:47 PM CSTMesoscale DiscussionSPCCook, DeKalb, DuPage, Ford, Grundy, Iroquois and 7 more88 min

Nearby

Mesoscale Discussions in Illinois, 2007Mesoscale Discussions in Indiana, 2007Mesoscale Discussions in Michigan, 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.