Alert archive / Missouri / Mesoscale Discussions in 2009

Mesoscale Discussion 747

May 7, 20095 states

The Storm Prediction Center issued this mesoscale discussion at May 7, 2009, 5:42 PM CDT for 5 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 7, 2009, 5:42 PM CDT (22:42 UTC)
Expired: May 7, 2009, 7:45 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 63 counties

Adams County, IA, Appanoose County, IA, Clarke County, IA, Davis County, IA, Decatur County, IA, Fremont County, IA, Lucas County, IA, Monroe County, IA, Montgomery County, IA, Page County, IA, Ringgold County, IA, Taylor County, IA, Union County, IA, Wayne County, IA, Adams County, IL, Brown County, IL, Pike County, IL, Scott County, IL, Atchison County, KS, Brown County, KS, Doniphan County, KS, Jackson County, KS, Jefferson County, KS, Leavenworth County, KS, Shawnee County, KS, Wyandotte County, KS, Adair County, MO, Andrew County, MO, Atchison County, MO, Audrain County, MO, Buchanan County, MO, Caldwell County, MO, Carroll County, MO, Chariton County, MO, Clark County, MO, Clay County, MO, Clinton County, MO, Daviess County, MO, DeKalb County, MO, Gentry County, MO, Grundy County, MO, Harrison County, MO, Holt County, MO, Knox County, MO, Lewis County, MO, Linn County, MO, Livingston County, MO, Macon County, MO, Marion County, MO, Mercer County, MO, Monroe County, MO, Nodaway County, MO, Pike County, MO, Platte County, MO, Putnam County, MO, Ralls County, MO, Randolph County, MO, Schuyler County, MO, Scotland County, MO, Shelby County, MO, Sullivan County, MO, Worth County, MO, Richardson County, NE

The radar

The Pleasant Hill radar (KEAX), 129 km from the middle of the area, began a volume at 22:45 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

Omaha, NE (KOAX), launched 12:00Z, 10.7 hours before the alert went out and 278 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2057 m above ground
0-6 km bulk shear: 72 kt
0-1 km storm-relative helicity: 33 m²/s²
0-3 km storm-relative helicity: 200 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.

Issued	Product	Office	Counties	Lasted
May 7, 5:56 PM CDT	Mesoscale Discussion	SPC	Adams, Brown, Cass, Champaign, Christian, Clark and 29 more	64 min
May 7, 6:14 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Bond, Brown, Calhoun, Cass, Champaign and 39 more	8 hr
May 7, 1:12 PM CDT	Mesoscale Discussion	SPC	Decatur, Fremont, Mills, Montgomery, Page, Ringgold and 1 more	93 min
May 7, 1:44 PM CDT	Tornado Watch	SPC	Adams, Appanoose, Clarke, Decatur, Fremont, Mills and 7 more	6 hr
May 7, 3:55 PM CDT	Mesoscale Discussion	SPC	Appanoose, Decatur, Fremont, Montgomery, Page, Ringgold and 2 more	65 min

Nearby

Mesoscale Discussions in Missouri, 2009 Mesoscale Discussions in Iowa, 2009 Mesoscale Discussions in Kansas, 2009 Every mesoscale discussion in 2009

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.