Alert archive / Arkansas / Mesoscale Discussions in 2020

Mesoscale Discussion 211

March 19, 20209 counties in Arkansas; LeFlore County, Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Mar 19, 2020, 6:06 PM CDT for 9 counties in Arkansas; LeFlore County, Oklahoma. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued: Mar 19, 2020, 6:06 PM CDT (23:06 UTC)
Expired: Mar 19, 2020, 7:30 PM CDT
In force: 84 min
Issued by: the Storm Prediction Center

Counties Franklin County, AR, Johnson County, AR, Logan County, AR, Newton County, AR, Polk County, AR, Pope County, AR, Scott County, AR, Searcy County, AR, Sebastian County, AR, LeFlore County, OK

The radar

The Western Arkansas radar (KSRX), 40 km from the middle of the area, began a volume at 23:09 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 12:00Z, 11.1 hours before the alert went out and 192 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: 545 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 176 m²/s²
0-3 km storm-relative helicity: 245 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
Mar 19, 11:05 AM CDT	Mesoscale Discussion	SPC	Baxter, Benton, Boone, Carroll, Clay, Cleburne and 21 more	115 min
Mar 19, 1:58 PM CDT	Mesoscale Discussion	SPC	Garland, Hempstead, Hot Spring, Howard, Little River, Logan and 9 more	62 min
Mar 19, 2:24 PM CDT	Tornado Watch	SPC	Baxter, Benton, Boone, Carroll, Clark, Cleburne and 48 more	8 hr
Mar 19, 3:40 PM CDT	Mesoscale Discussion	SPC	Clay, Randolph	65 min
Mar 19, 3:23 AM CDT	Mesoscale Discussion	SPC	Cleveland, Garvin, Grady, McClain, Murray, Oklahoma and 4 more	2 hr

Nearby

Mesoscale Discussions in Arkansas, 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.