Alert archive / Arkansas / Mesoscale Discussions in 2020

Mesoscale Discussion 615

May 16, 20204 states

The Storm Prediction Center issued this mesoscale discussion at May 16, 2020, 5:31 PM CDT for 4 states. It was in force for 59 min.

The area

The outline as issued.

The facts

Issued: May 16, 2020, 5:31 PM CDT (22:31 UTC)
Expired: May 16, 2020, 6:30 PM CDT
In force: 59 min
Issued by: the Storm Prediction Center
Concerning: Tornado watch 191

Counties Columbia County, AR, Hempstead County, AR, Howard County, AR, Lafayette County, AR, Little River County, AR, Miller County, AR, Nevada County, AR, Ouachita County, AR, Sevier County, AR, Union County, AR, Claiborne Parish, LA, Union Parish, LA, McCurtain County, OK, Bowie County, TX

The radar

The Shreveport radar (KSHV), 111 km from the middle of the area, began a volume at 22:31 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

Shreveport, LA (KSHV), launched 12:00Z, 10.5 hours before the alert went out and 107 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: 144 J/kg
Mixed-layer CIN: -88 J/kg
Mixed-layer LCL: 699 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 20 m²/s²
0-3 km storm-relative helicity: 43 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 16, 1:16 PM CDT	Mesoscale Discussion	SPC	Ashley, Bradley, Calhoun, Clark, Cleveland, Columbia and 19 more	2 hr
May 16, 3:27 PM CDT	Tornado Watch	SPC	Calhoun, Clark, Columbia, Dallas, Garland, Hempstead and 12 more	6 hr
May 16, 6:21 PM CDT	Mesoscale Discussion	SPC	Ashley, Chicot, Drew	84 min
May 15, 8:18 PM CDT	Mesoscale Discussion	SPC	Beaver, Cimarron, Texas	2 hr
May 15, 8:56 PM CDT	Mesoscale Discussion	SPC	Atascosa, Bandera, Bastrop, Bee, Bell, Bexar and 71 more	2 hr
May 15, 9:14 PM CDT	Severe Thunderstorm Watch	SPC	Aransas, Atascosa, Bandera, Bastrop, Bee, Bell and 66 more	7 hr
May 15, 11:44 PM CDT	Mesoscale Discussion	SPC	Aransas, Atascosa, Austin, Bastrop, Bee, Bell and 48 more	2 hr
May 16, 12:54 AM CDT	Severe Thunderstorm Watch	SPC	Austin, Brazoria, Chambers, Colorado, Fort Bend, Galveston and 6 more	4 hr
May 16, 1:31 AM CDT	Mesoscale Discussion	SPC	Aransas, Brooks, Calhoun, Duval, Goliad, Hidalgo and 11 more	89 min

Nearby

Mesoscale Discussions in Arkansas, 2020 Mesoscale Discussions in Louisiana, 2020 Mesoscale Discussions in Oklahoma, 2020 Every mesoscale discussion in 2020

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.