Alert archive / Arkansas / Mesoscale Discussions in 2017

Mesoscale Discussion 885

May 27, 20174 states

The Storm Prediction Center issued this mesoscale discussion at May 27, 2017, 9:26 PM CDT for 4 states. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued
May 27, 2017, 9:26 PM CDT (02:26 UTC)
Expired
May 27, 2017, 11:00 PM CDT
In force
94 min
Issued by
the Storm Prediction Center
All 23 counties

Clay County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Greene County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Lawrence County, AR, Mississippi County, AR, Poinsett County, AR, Randolph County, AR, Sharp County, AR, St. Francis County, AR, Butler County, MO, Dunklin County, MO, Pemiscot County, MO, DeSoto County, MS, Fayette County, TN, Haywood County, TN, Lauderdale County, TN, Shelby County, TN, Tipton County, TN

The radar

The Memphis radar (KNQA), 92 km from the middle of the area, began a volume at 02:30 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 00:00Z, 2.4 hours before the alert went out and 126 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 00:00Z on 2017-05-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3385 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 00:00Z on 2017-05-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 113 square meters per square second.19395878Sfc1 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
3385 J/kg
Mixed-layer CIN
-56 J/kg
Mixed-layer LCL
1096 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
113 m²/s²
0-3 km storm-relative helicity
157 m²/s²
Significant tornado parameter
2.5
Supercell composite
15.1

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 27, 7:01 PM CDTTornado WatchSPCBaxter, Boone, Clay, Cleburne, Conway, Craighead and 20 more6 hr
May 27, 9:59 PM CDTTornado WatchSPCCrittenden, Cross, Lee, St. Francis2 hr
May 27, 11:47 PM CDTMesoscale DiscussionSPCCrawford, Sebastian, Washington58 min
May 28, 12:06 AM CDTSevere Thunderstorm WatchSPCBenton, Carroll, Columbia, Crawford, Franklin, Hempstead and 10 more5 hr
May 28, 12:18 AM CDTSevere Thunderstorm WatchSPCArkansas, Bradley, Calhoun, Clark, Cleburne, Cleveland and 36 more6 hr
May 28, 12:52 AM CDTMesoscale DiscussionSPCHoward, Montgomery, Polk23 min
May 28, 2:11 AM CDTMesoscale DiscussionSPCArkansas, Clark, Cleveland, Dallas, Desha, Faulkner and 12 more2 hr
May 28, 2:53 AM CDTMesoscale DiscussionSPCColumbia, Hempstead, Howard, Lafayette, Little River, Miller and 6 more2 hr
May 28, 4:59 AM CDTMesoscale DiscussionSPCAshley, Bradley, Calhoun, Chicot, Cleveland, Columbia and 9 more2 hr
May 27, 11:46 PM CDTMesoscale DiscussionSPCCalhoun, Carroll, Chickasaw, Choctaw, Clay, Grenada and 12 more59 min
May 28, 10:59 AM CDTMesoscale DiscussionSPCGeorge, Hancock, Harrison, Jackson, Pearl River, Stone2 hr
May 27, 7:02 PM CDTMesoscale DiscussionSPCBedford, Cannon, Cheatham, Coffee, Davidson, DeKalb and 18 more58 min
May 27, 9:07 PM CDTSevere Thunderstorm WatchSPCFranklin, Giles, Lawrence, Lincoln, Moore, Wayne8 hr
May 27, 9:46 PM CDTMesoscale DiscussionSPCAnderson, Bledsoe, Blount, Bradley, Carter, Claiborne and 24 more89 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.