Alert archive / Missouri / Mesoscale Discussions in 2015

Mesoscale Discussion 248

April 9, 201517 counties in Missouri; Ottawa County, Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Apr 9, 2015, 1:32 PM CDT for 17 counties in Missouri; Ottawa County, Oklahoma. It was in force for 118 min.

The area

The outline as issued.

The facts

Issued: Apr 9, 2015, 1:32 PM CDT (18:32 UTC)
Expired: Apr 9, 2015, 3:30 PM CDT
In force: 118 min
Issued by: the Storm Prediction Center
Chance of a watch: 60%

Counties Barry County, MO, Barton County, MO, Benton County, MO, Camden County, MO, Cedar County, MO, Dade County, MO, Dallas County, MO, Greene County, MO, Henry County, MO, Hickory County, MO, Jasper County, MO, Lawrence County, MO, McDonald County, MO, Newton County, MO, Polk County, MO, St. Clair County, MO, Vernon County, MO, Ottawa County, OK

The radar

The Springfield radar (KSGF), 67 km from the middle of the area, began a volume at 18:33 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 42Apr 9, 2:35 PM CDT

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 6.5 hours before the alert went out and 75 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: 950 J/kg
Mixed-layer CIN: -28 J/kg
Mixed-layer LCL: 857 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 275 m²/s²
0-3 km storm-relative helicity: 270 m²/s²
Significant tornado parameter: 1.6
Supercell composite: 6.3

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
Apr 8, 7:04 PM CDT	Mesoscale Discussion	SPC	Bollinger, Cape Girardeau, Iron, Madison, Perry, Sainte Genevieve and 1 more	116 min
Apr 9, 12:29 PM CDT	Mesoscale Discussion	SPC	Adair, Clark, Grundy, Knox, Linn, Macon and 5 more	91 min
Apr 9, 12:58 PM CDT	Tornado Watch	SPC	Adair, Audrain, Boone, Callaway, Carroll, Chariton and 27 more	6 hr
Apr 9, 2:32 PM CDT	Severe Thunderstorm Watch	SPC	Barry, Benton, Camden, Christian, Dade, Dallas and 22 more	7 hr
Apr 9, 3:12 PM CDT	Mesoscale Discussion	SPC	Adair, Audrain, Boone, Chariton, Clark, Cooper and 19 more	93 min
Apr 9, 3:45 PM CDT	Mesoscale Discussion	SPC	Bollinger, Butler, Cape Girardeau, Carter, Crawford, Franklin and 14 more	60 min
Apr 9, 4:40 PM CDT	Tornado Watch	SPC	Crawford, Franklin, Iron, Jefferson, Lincoln, Madison and 8 more	6 hr
Apr 9, 6:11 PM CDT	Mesoscale Discussion	SPC	Butler, Carter, Dunklin, Mississippi, New Madrid, Oregon and 5 more	64 min
Apr 9, 6:32 PM CDT	Severe Thunderstorm Watch	SPC	Dunklin, Pemiscot	5 hr
Apr 9, 6:48 PM CDT	Tornado Watch	SPC	Bollinger, Butler, Cape Girardeau, Carter, Mississippi, New Madrid and 5 more	6 hr
Apr 8, 7:45 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Beckham, Blaine, Caddo, Canadian, Custer and 22 more	90 min
Apr 9, 2:15 PM CDT	Mesoscale Discussion	SPC	McCurtain	2 hr
Apr 9, 3:17 PM CDT	Severe Thunderstorm Watch	SPC	McCurtain	7 hr

Nearby

Mesoscale Discussions in Missouri, 2015 Mesoscale Discussions in Oklahoma, 2015 Every mesoscale discussion in 2015

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.