Alert archive / Arkansas / Mesoscale Discussions in 2018

Mesoscale Discussion 630

June 2, 201826 counties in Arkansas; Dunklin County, Missouri

The Storm Prediction Center issued this mesoscale discussion at Jun 2, 2018, 9:05 PM CDT for 26 counties in Arkansas; Dunklin County, Missouri. It was in force for 55 min.

The area

The outline as issued.

The facts

Issued: Jun 2, 2018, 9:05 PM CDT (02:05 UTC)
Expired: Jun 2, 2018, 10:00 PM CDT
In force: 55 min
Issued by: the Storm Prediction Center

All 27 counties

Clay County, AR, Cleburne County, AR, Conway County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Faulkner County, AR, Garland County, AR, Greene County, AR, Independence County, AR, Jackson County, AR, Lawrence County, AR, Lonoke County, AR, Mississippi County, AR, Monroe County, AR, Perry County, AR, Poinsett County, AR, Prairie County, AR, Pulaski County, AR, Randolph County, AR, Saline County, AR, St. Francis County, AR, Van Buren County, AR, White County, AR, Woodruff County, AR, Yell County, AR, Dunklin County, MO

The radar

The Little Rock radar (KLZK), 91 km from the middle of the area, began a volume at 02:08 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 00:00Z, 2.1 hours before the alert went out and 170 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: 3454 J/kg
Mixed-layer CIN: -78 J/kg
Mixed-layer LCL: 1169 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 46 m²/s²
0-3 km storm-relative helicity: 186 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 6.2

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
Jun 3, 1:32 AM CDT	Mesoscale Discussion	SPC	Phillips	118 min
Jun 3, 3:54 AM CDT	Mesoscale Discussion	SPC	Ashley, Bradley, Chicot, Desha, Drew, Lincoln and 1 more	66 min

Nearby

Mesoscale Discussions in Arkansas, 2018 Mesoscale Discussions in Missouri, 2018 Every mesoscale discussion in 2018

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.