Alert archive / Arkansas / Mesoscale Discussions in 2017

Mesoscale Discussion 786

May 19, 20175 states

The Storm Prediction Center issued this mesoscale discussion at May 19, 2017, 5:03 PM CDT for 5 states. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued
May 19, 2017, 5:03 PM CDT (22:03 UTC)
Expired
May 19, 2017, 7:00 PM CDT
In force
117 min
Issued by
the Storm Prediction Center
Chance of a watch
20%
All 48 counties

Arkansas County, AR, Clay County, AR, Cleburne County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Faulkner County, AR, Greene County, AR, Independence County, AR, Jackson County, AR, Lawrence County, AR, Lee County, AR, Lonoke County, AR, Mississippi County, AR, Monroe County, AR, Phillips County, AR, Poinsett County, AR, Prairie County, AR, Randolph County, AR, Sharp County, AR, St. Francis County, AR, Stone County, AR, White County, AR, Woodruff County, AR, Carlisle County, KY, Fulton County, KY, Hickman County, KY, Butler County, MO, Dunklin County, MO, Mississippi County, MO, New Madrid County, MO, Pemiscot County, MO, Stoddard County, MO, DeSoto County, MS, Marshall County, MS, Tate County, MS, Tunica County, MS, Crockett County, TN, Dyer County, TN, Fayette County, TN, Gibson County, TN, Haywood County, TN, Lake County, TN, Lauderdale County, TN, Obion County, TN, Shelby County, TN, Tipton County, TN, Weakley County, TN

The radar

The Memphis radar (KNQA), 75 km from the middle of the area, began a volume at 22:05 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, 10.1 hours before the alert went out and 127 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-pSkew-T log-p diagram, Little Rock, AR at 12:00Z on 2017-05-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 276 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Little Rock, AR at 12:00Z on 2017-05-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 183 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
276 J/kg
Mixed-layer CIN
-189 J/kg
Mixed-layer LCL
874 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
183 m²/s²
0-3 km storm-relative helicity
121 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.3

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.

IssuedProductOfficeCountiesLasted
May 18, 9:41 PM CDTMesoscale DiscussionSPCBenton, Carroll, Crawford, Franklin, Logan, Madison and 3 more94 min
May 18, 10:58 PM CDTTornado WatchSPCBaxter, Benton, Boone, Carroll, Cleburne, Conway and 21 more6 hr
May 18, 11:48 PM CDTMesoscale DiscussionSPCBenton, Boone, Carroll, Crawford, Madison, Washington57 min
May 19, 2:13 PM CDTMesoscale DiscussionSPCBaxter, Benton, Boone, Carroll, Crawford, Franklin and 9 more92 min
May 19, 3:26 PM CDTTornado WatchSPCBenton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more11 hr
May 19, 6:56 PM CDTMesoscale DiscussionSPCBenton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more2 hr
May 19, 12:38 PM CDTMesoscale DiscussionSPCAnderson, Bath, Boone, Bourbon, Boyd, Bracken and 31 more2 hr
May 19, 2:13 PM CDTSevere Thunderstorm WatchSPCBoone, Bracken, Campbell, Carroll, Gallatin, Grant and 5 more6 hr
May 19, 4:50 PM CDTMesoscale DiscussionSPCBracken, Campbell, Grant, Mason, Pendleton55 min
May 18, 7:06 PM CDTMesoscale DiscussionSPCBuchanan, Caldwell, Cass, Clay, Clinton, Jackson and 4 more84 min
May 18, 9:41 PM CDTSevere Thunderstorm WatchSPCAndrew, Bates, Buchanan, Caldwell, Cass, Clay and 9 more4 hr
May 19, 4:07 AM CDTMesoscale DiscussionSPCCallaway, Crawford, Franklin, Gasconade, Jefferson, Lincoln and 9 more113 min
May 19, 4:16 AM CDTSevere Thunderstorm WatchSPCCrawford, Franklin, Gasconade, Iron, Jefferson, Lincoln and 9 more3 hr
May 19, 3:06 PM CDTTornado WatchSPCAudrain, Barry, Benton, Boone, Callaway, Camden and 41 more7 hr
May 19, 6:04 PM CDTMesoscale DiscussionSPCAudrain, Barry, Benton, Boone, Callaway, Camden and 47 more86 min

Nearby

Mesoscale Discussions in Arkansas, 2017Mesoscale Discussions in Tennessee, 2017Mesoscale Discussions in Missouri, 2017Every 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.