Alert archive / Missouri / Mesoscale Discussions in 2014

Mesoscale Discussion 1303

July 7, 2014Monroe County, Illinois; 16 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Jul 7, 2014, 6:01 PM CDT for Monroe County, Illinois; 16 counties in Missouri. It was in force for 59 min.

The area

The outline as issued.

The facts

Issued: Jul 7, 2014, 6:01 PM CDT (23:01 UTC)
Expired: Jul 7, 2014, 7:00 PM CDT
In force: 59 min
Issued by: the Storm Prediction Center
Chance of a watch: 5%

Counties Monroe County, IL, Callaway County, MO, City of Saint Louis, MO, Crawford County, MO, Franklin County, MO, Gasconade County, MO, Iron County, MO, Jefferson County, MO, Lincoln County, MO, Montgomery County, MO, Osage County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Warren County, MO, Washington County, MO

The radar

The St Louis radar (KLSX), 55 km from the middle of the area, began a volume at 23:02 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 401Jul 7, 8:55 PM CDT

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 11.0 hours before the alert went out and 293 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: 1670 J/kg
Mixed-layer CIN: -91 J/kg
Mixed-layer LCL: 689 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 140 m²/s²
0-3 km storm-relative helicity: 240 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.8

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
Jul 6, 11:11 PM CDT	Mesoscale Discussion	SPC	Boone, Cook, DeKalb, DuPage, Kane, Lake and 3 more	64 min
Jul 7, 1:45 PM CDT	Mesoscale Discussion	SPC	Bond, Clark, Clay, Clinton, Crawford, Cumberland and 21 more	90 min
Jul 7, 5:39 PM CDT	Severe Thunderstorm Watch	SPC	Atchison, Holt, Nodaway	7 hr

Nearby

Mesoscale Discussions in Missouri, 2014 Mesoscale Discussions in Illinois, 2014 Every mesoscale discussion in 2014

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.