Alert archive / Arkansas / Mesoscale Discussions in 2018

Mesoscale Discussion 209

April 3, 20186 states

The Storm Prediction Center issued this mesoscale discussion at Apr 3, 2018, 3:34 PM CDT for 6 states. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued
Apr 3, 2018, 3:34 PM CDT (20:34 UTC)
Expired
Apr 3, 2018, 5:00 PM CDT
In force
86 min
Issued by
the Storm Prediction Center
All 120 counties

Arkansas County, AR, Clark County, AR, Clay County, AR, Cleburne County, AR, Cleveland County, AR, Conway County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Dallas County, AR, Faulkner County, AR, Fulton County, AR, Garland County, AR, Grant County, AR, Greene County, AR, Hot Spring County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Jefferson County, AR, Lawrence County, AR, Lee County, AR, Lincoln County, AR, Lonoke County, AR, Mississippi County, AR, Monroe County, AR, Montgomery County, AR, Perry County, AR, Phillips County, AR, Pike County, AR, Poinsett County, AR, Polk County, AR, Pope County, AR, Prairie County, AR, Pulaski County, AR, Randolph County, AR, Saline County, AR, Searcy County, AR, Sharp County, AR, St. Francis County, AR, Stone County, AR, Van Buren County, AR, White County, AR, Woodruff County, AR, Yell County, AR, Alexander County, IL, Bond County, IL, Clay County, IL, Clinton County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, Douglas County, IL, Edwards County, IL, Effingham County, IL, Fayette County, IL, Franklin County, IL, Gallatin County, IL, Hamilton County, IL, Hardin County, IL, Jackson County, IL, Jasper County, IL, Jefferson County, IL, Johnson County, IL, Lawrence County, IL, Marion County, IL, Massac County, IL, Monroe County, IL, Moultrie County, IL, Perry County, IL, Pope County, IL, Pulaski County, IL, Randolph County, IL, Richland County, IL, Saint Clair County, IL, Saline County, IL, Shelby County, IL, Union County, IL, Wabash County, IL, Washington County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Posey County, IN, Ballard County, KY, Carlisle County, KY, Crittenden County, KY, Fulton County, KY, Graves County, KY, Hickman County, KY, Livingston County, KY, Marshall County, KY, McCracken County, KY, Union County, KY, Bollinger County, MO, Butler County, MO, Cape Girardeau County, MO, Carter County, MO, Dunklin County, MO, Iron County, MO, Madison County, MO, Mississippi County, MO, New Madrid County, MO, Oregon County, MO, Pemiscot County, MO, Perry County, MO, Reynolds County, MO, Ripley County, MO, Saint Francois County, MO, Sainte Genevieve County, MO, Scott County, MO, Stoddard County, MO, Wayne County, MO, Crockett County, TN, Dyer County, TN, Lake County, TN, Lauderdale County, TN, Obion County, TN, Shelby County, TN, Tipton County, TN

The radar

The Memphis radar (KNQA), 145 km from the middle of the area, began a volume at 20:33 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Little Rock, AR (KBYH), launched 12:00Z, 8.6 hours before the alert went out and 197 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 2018-04-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 494 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 2018-04-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 256 square meters per square second.1939587897117Sfc1 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
494 J/kg
Mixed-layer CIN
-170 J/kg
Mixed-layer LCL
639 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
256 m²/s²
0-3 km storm-relative helicity
233 m²/s²
Significant tornado parameter
0.1
Supercell composite
5.4

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
Apr 3, 10:26 AM CDTSevere Thunderstorm WatchSPCColumbia, Hempstead, Howard, Lafayette, Little River, Miller and 2 more8 hr
Apr 3, 12:57 PM CDTMesoscale DiscussionSPCBaxter, Clark, Clay, Cleburne, Conway, Craighead and 39 more2 hr
Apr 3, 1:33 PM CDTTornado WatchSPCArkansas, Baxter, Boone, Bradley, Calhoun, Clark and 51 more7 hr
Apr 3, 1:55 PM CDTMesoscale DiscussionSPCLittle River95 min
Apr 3, 4:33 PM CDTMesoscale DiscussionSPCAshley, Chicot, Union57 min
Apr 3, 4:51 PM CDTSevere Thunderstorm WatchSPCAshley, Chicot, Union5 hr
Apr 2, 10:46 PM CDTMesoscale DiscussionSPCBond, Clay, Clinton, Edwards, Effingham, Fayette and 21 more119 min
Apr 3, 11:41 AM CDTMesoscale DiscussionSPCBartholomew, Blackford, Brown, Clark, Clay, Crawford and 46 more3 hr
Apr 3, 12:16 PM CDTTornado WatchSPCBartholomew, Boone, Brown, Clark, Clay, Crawford and 48 more6 hr
Apr 3, 3:18 PM CDTMesoscale DiscussionSPCClark, Dearborn, Decatur, Fayette, Floyd, Franklin and 9 more117 min
Apr 3, 6:30 PM CDTTornado WatchSPCBartholomew, Boone, Brown, Clark, Clay, Crawford and 41 more5 hr
Apr 3, 5:38 PM CDTMesoscale DiscussionSPCBath, Bourbon, Boyd, Carter, Clark, Elliott and 12 more2 hr
Apr 3, 6:07 PM CDTSevere Thunderstorm WatchSPCBoyd, Carter, Greenup, Lawrence6 hr
Apr 3, 6:51 PM CDTMesoscale DiscussionSPCBedford, Benton, Cannon, Carroll, Cheatham, Chester and 40 more114 min

Nearby

Mesoscale Discussions in Arkansas, 2018Mesoscale Discussions in Illinois, 2018Mesoscale Discussions in Missouri, 2018Every 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.