Alert archive / Arkansas / Mesoscale Discussions in 2017

Mesoscale Discussion 773

May 18, 20176 counties in Arkansas; 6 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at May 18, 2017, 11:48 PM CDT for 6 counties in Arkansas; 6 counties in Missouri. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued: May 18, 2017, 11:48 PM CDT (04:48 UTC)
Expired: May 19, 2017, 12:45 AM CDT
In force: 57 min
Issued by: the Storm Prediction Center

Counties Benton County, AR, Boone County, AR, Carroll County, AR, Crawford County, AR, Madison County, AR, Washington County, AR, Barry County, MO, Christian County, MO, McDonald County, MO, Newton County, MO, Stone County, MO, Taney County, MO

The radar

The Springfield radar (KSGF), 104 km from the middle of the area, began a volume at 04:52 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 nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 4.8 hours before the alert went out and 59 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: 2055 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 1439 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 44 m²/s²
0-3 km storm-relative helicity: 52 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 2.4

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 18, 9:41 PM CDT	Mesoscale Discussion	SPC	Benton, Carroll, Crawford, Franklin, Logan, Madison and 3 more	94 min
May 18, 10:58 PM CDT	Tornado Watch	SPC	Baxter, Benton, Boone, Carroll, Cleburne, Conway and 21 more	6 hr
May 19, 2:13 PM CDT	Mesoscale Discussion	SPC	Baxter, Benton, Boone, Carroll, Crawford, Franklin and 9 more	92 min
May 19, 3:26 PM CDT	Tornado Watch	SPC	Benton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more	11 hr
May 19, 5:03 PM CDT	Mesoscale Discussion	SPC	Arkansas, Clay, Cleburne, Craighead, Crittenden, Cross and 18 more	117 min
May 19, 6:56 PM CDT	Mesoscale Discussion	SPC	Benton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more	2 hr
May 18, 7:06 PM CDT	Mesoscale Discussion	SPC	Buchanan, Caldwell, Cass, Clay, Clinton, Jackson and 4 more	84 min
May 18, 9:41 PM CDT	Severe Thunderstorm Watch	SPC	Andrew, Bates, Buchanan, Caldwell, Cass, Clay and 9 more	4 hr
May 19, 4:07 AM CDT	Mesoscale Discussion	SPC	Callaway, Crawford, Franklin, Gasconade, Jefferson, Lincoln and 9 more	113 min
May 19, 4:16 AM CDT	Severe Thunderstorm Watch	SPC	Crawford, Franklin, Gasconade, Iron, Jefferson, Lincoln and 9 more	3 hr
May 19, 3:06 PM CDT	Tornado Watch	SPC	Audrain, Barry, Benton, Boone, Callaway, Camden and 41 more	7 hr
May 19, 6:04 PM CDT	Mesoscale Discussion	SPC	Audrain, Barry, Benton, Boone, Callaway, Camden and 47 more	86 min

Nearby

Mesoscale Discussions in Arkansas, 2017 Mesoscale Discussions in Missouri, 2017 Every mesoscale discussion in 2017

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.