Alert archive / Illinois / Mesoscale Discussions in 2003

Mesoscale Discussion 225

March 12, 200315 counties in Illinois

The Storm Prediction Center issued this mesoscale discussion at Mar 12, 2003, 9:28 PM CST for 15 counties in Illinois. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Mar 12, 2003, 9:28 PM CST (03:28 UTC)
Expired
Mar 12, 2003, 11:30 PM CST
In force
2 hr
Issued by
the Storm Prediction Center

Counties Christian County, IL, Clark County, IL, Coles County, IL, Cumberland County, IL, Douglas County, IL, Greene County, IL, Jersey County, IL, Macoupin County, IL, Montgomery County, IL, Morgan County, IL, Moultrie County, IL, Pike County, IL, Sangamon County, IL, Scott County, IL, Shelby County, IL

The radar

The Lincoln radar (KILX), 67 km from the middle of the area, began a volume at 03:30 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 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 00:00Z, 3.5 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, Lincoln, IL at 00:00Z on 2003-03-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 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, Lincoln, IL at 00:00Z on 2003-03-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 192 square meters per square second.1939587897Sfc1 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
1320 m above ground
0-6 km bulk shear
66 kt
0-1 km storm-relative helicity
192 m²/s²
0-3 km storm-relative helicity
313 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
Mar 12, 9:52 PM CSTMesoscale DiscussionSPCMonroe, Saint Clair113 min
Mar 13, 12:00 AM CSTSevere Thunderstorm WatchSPCBond, Calhoun, Clinton, Fayette, Jersey, Macoupin and 5 more5 hr
Mar 13, 1:35 AM CSTMesoscale DiscussionSPCAlexander, Franklin, Hamilton, Jackson, Jefferson, Johnson and 7 more115 min

Nearby

Mesoscale Discussions in Illinois, 2003Every mesoscale discussion in 2003

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.