Alert archive / Missouri / Mesoscale Discussions in 2006

Mesoscale Discussion 737

May 3, 200610 counties in Illinois; 25 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at May 3, 2006, 9:17 AM CDT for 10 counties in Illinois; 25 counties in Missouri. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued: May 3, 2006, 9:17 AM CDT (14:17 UTC)
Expired: May 3, 2006, 10:45 AM CDT
In force: 88 min
Issued by: the Storm Prediction Center

All 35 counties

Calhoun County, IL, Greene County, IL, Jersey County, IL, Macoupin County, IL, Madison County, IL, Monroe County, IL, Pike County, IL, Saint Clair County, IL, Scott County, IL, Washington County, IL, Audrain County, MO, Boone County, MO, Callaway County, MO, Camden County, MO, City of Saint Louis, MO, Cole County, MO, Crawford County, MO, Franklin County, MO, Gasconade County, MO, Jefferson County, MO, Lincoln County, MO, Maries County, MO, Miller County, MO, Moniteau County, MO, Monroe County, MO, Montgomery County, MO, Osage County, MO, Phelps County, MO, Pike County, MO, Pulaski County, MO, Ralls County, MO, Saint Charles County, MO, Saint Louis County, MO, Warren County, MO, Washington County, MO

The radar

The St Louis radar (KLSX), 100 km from the middle of the area, began a volume at 14:20 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.

Severe Thunderstorm Watch 282May 3, 1:05 PM CDT

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 2.3 hours before the alert went out and 256 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1602 J/kg
Mixed-layer CIN: -87 J/kg
Mixed-layer LCL: 1017 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 100 m²/s²
0-3 km storm-relative helicity: 133 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.9

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.

Issued	Product	Office	Counties	Lasted
May 3, 12:46 PM CDT	Mesoscale Discussion	SPC	Alexander, Massac, Pulaski, Union	59 min
May 3, 1:02 PM CDT	Severe Thunderstorm Watch	SPC	Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 14 more	7 hr
May 3, 4:06 PM CDT	Mesoscale Discussion	SPC	Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 16 more	54 min
May 3, 6:34 PM CDT	Mesoscale Discussion	SPC	Alexander	86 min
May 2, 9:41 PM CDT	Mesoscale Discussion	SPC	Andrew, Atchison, Buchanan, Clay, Clinton, DeKalb and 5 more	94 min
May 3, 2:59 AM CDT	Mesoscale Discussion	SPC	Andrew, Buchanan, Caldwell, Carroll, Chariton, Clay and 19 more	2 hr

Nearby

Mesoscale Discussions in Missouri, 2006 Mesoscale Discussions in Illinois, 2006 Every mesoscale discussion in 2006

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.