Alert archive / Arkansas / Mesoscale Discussions in 2018

Mesoscale Discussion 339

May 3, 201837 counties in Arkansas

The Storm Prediction Center issued this mesoscale discussion at May 3, 2018, 4:52 PM CDT for 37 counties in Arkansas. It was in force for 53 min.

The area

The outline as issued.

The facts

Issued: May 3, 2018, 4:52 PM CDT (21:52 UTC)
Expired: May 3, 2018, 5:45 PM CDT
In force: 53 min
Issued by: the Storm Prediction Center

All 37 counties

Baxter County, AR, Clark County, AR, Clay County, AR, Cleburne County, AR, Cleveland County, AR, Conway County, AR, Dallas County, AR, Faulkner County, AR, Fulton County, AR, Garland County, AR, Grant County, AR, Greene County, AR, Hot Spring County, AR, Howard County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Jefferson County, AR, Lawrence County, AR, Lonoke County, AR, Marion County, AR, Montgomery County, AR, Perry County, AR, Pike County, AR, Pope County, AR, Prairie County, AR, Pulaski County, AR, Randolph County, AR, Saline County, AR, Searcy County, AR, Sevier County, AR, Sharp County, AR, Stone County, AR, Van Buren County, AR, White County, AR, Woodruff County, AR, Yell County, AR

The radar

The Little Rock radar (KLZK), 74 km from the middle of the area, began a volume at 21:51 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, 9.9 hours before the alert went out and 201 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: 363 J/kg
Mixed-layer CIN: -131 J/kg
Mixed-layer LCL: 962 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 394 m²/s²
0-3 km storm-relative helicity: 310 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.3

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 2, 10:20 PM CDT	Mesoscale Discussion	SPC	Baxter, Benton, Boone, Carroll, Crawford, Franklin and 6 more	115 min
May 2, 11:09 PM CDT	Severe Thunderstorm Watch	SPC	Baxter, Benton, Boone, Carroll, Crawford, Franklin and 12 more	7 hr
May 3, 2:32 AM CDT	Mesoscale Discussion	SPC	Baxter, Boone, Carroll, Franklin, Fulton, Izard and 6 more	88 min
May 3, 9:02 AM CDT	Mesoscale Discussion	SPC	Crawford, Franklin, Sebastian, Washington	88 min
May 3, 12:35 PM CDT	Mesoscale Discussion	SPC	Boone, Carroll, Clark, Conway, Crawford, Franklin and 22 more	85 min
May 3, 1:44 PM CDT	Severe Thunderstorm Watch	SPC	Baxter, Clark, Clay, Cleburne, Conway, Craighead and 34 more	4 hr
May 3, 3:45 PM CDT	Mesoscale Discussion	SPC	Arkansas, Clark, Clay, Cleburne, Cleveland, Craighead and 25 more	60 min

Nearby

Mesoscale Discussions in Arkansas, 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.