Alert archive / Arkansas / Mesoscale Discussions in 2017

Mesoscale Discussion 1750

November 3, 201713 counties in Arkansas; 8 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Nov 3, 2017, 5:21 PM CDT for 13 counties in Arkansas; 8 counties in Mississippi. It was in force for 114 min.

The area

The outline as issued.

The facts

Issued: Nov 3, 2017, 5:21 PM CDT (22:21 UTC)
Expired: Nov 3, 2017, 7:15 PM CDT
In force: 114 min
Issued by: the Storm Prediction Center

All 21 counties

Arkansas County, AR, Ashley County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Cleveland County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Grant County, AR, Jefferson County, AR, Lincoln County, AR, Phillips County, AR, Bolivar County, MS, Coahoma County, MS, Humphreys County, MS, Leflore County, MS, Quitman County, MS, Sunflower County, MS, Tallahatchie County, MS, Washington County, MS

The radar

The Little Rock radar (KLZK), 149 km from the middle of the area, began a volume at 22:23 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

Little Rock, AR (KBYH), launched 12:00Z, 10.4 hours before the alert went out and 154 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: 1840 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 478 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: -67 m²/s²
0-3 km storm-relative helicity: -73 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
Nov 3, 2:11 PM CDT	Mesoscale Discussion	SPC	Arkansas, Bradley, Calhoun, Chicot, Cleveland, Dallas and 11 more	2 hr
Nov 3, 3:49 PM CDT	Severe Thunderstorm Watch	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 7 more	6 hr

Nearby

Mesoscale Discussions in Arkansas, 2017 Mesoscale Discussions in Mississippi, 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.