Alert archive / Tennessee / Mesoscale Discussions in 2017

Mesoscale Discussion 859

May 27, 20175 states

The Storm Prediction Center issued this mesoscale discussion at May 27, 2017, 6:12 AM CDT for 5 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 27, 2017, 6:12 AM CDT (11:12 UTC)
Expired
May 27, 2017, 8:15 AM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 39 counties

Clay County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Greene County, AR, Mississippi County, AR, Poinsett County, AR, Fulton County, KY, Dunklin County, MO, New Madrid County, MO, Pemiscot County, MO, Alcorn County, MS, Benton County, MS, DeSoto County, MS, Marshall County, MS, Prentiss County, MS, Tippah County, MS, Tishomingo County, MS, Benton County, TN, Carroll County, TN, Chester County, TN, Crockett County, TN, Decatur County, TN, Dyer County, TN, Fayette County, TN, Gibson County, TN, Hardeman County, TN, Hardin County, TN, Haywood County, TN, Henderson County, TN, Henry County, TN, Lake County, TN, Lauderdale County, TN, Madison County, TN, McNairy County, TN, Obion County, TN, Shelby County, TN, Tipton County, TN, Weakley County, TN

The radar

The Memphis radar (KNQA), 37 km from the middle of the area, began a volume at 11:16 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, 11.2 hours before the alert went out and 92 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 2017-05-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1997 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 2017-05-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 161 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
1997 J/kg
Mixed-layer CIN
-268 J/kg
Mixed-layer LCL
951 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
161 m²/s²
0-3 km storm-relative helicity
178 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

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 26, 10:36 PM CDTMesoscale DiscussionSPCBenton, Crawford, Madison, Washington54 min
May 27, 12:06 AM CDTSevere Thunderstorm WatchSPCBaxter, Benton, Boone, Carroll, Fulton, Izard and 7 more5 hr
May 27, 2:04 AM CDTMesoscale DiscussionSPCBaxter, Benton, Boone, Carroll, Fulton, Independence and 10 more116 min
May 27, 3:54 AM CDTMesoscale DiscussionSPCBaxter, Boone, Clay, Craighead, Fulton, Greene and 7 more2 hr
May 27, 4:19 AM CDTSevere Thunderstorm WatchSPCClay, Craighead, Crittenden, Cross, Greene, Lawrence and 3 more6 hr
May 27, 4:01 PM CDTTornado WatchSPCBenton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more10 hr
May 27, 6:17 PM CDTMesoscale DiscussionSPCBaxter, Boone, Cleburne, Craighead, Fulton, Greene and 12 more58 min
May 27, 9:13 AM CDTMesoscale DiscussionSPCAdair, Allen, Barren, Bell, Clinton, Cumberland and 12 more92 min
May 27, 12:50 PM CDTMesoscale DiscussionSPCAdair, Allen, Anderson, Barren, Bath, Bell and 88 more85 min
May 27, 1:16 PM CDTMesoscale DiscussionSPCBallard, Caldwell, Calloway, Carlisle, Christian, Crittenden and 16 more59 min
May 27, 1:36 PM CDTSevere Thunderstorm WatchSPCAdair, Allen, Anderson, Ballard, Barren, Bourbon and 65 more7 hr
May 27, 3:11 PM CDTSevere Thunderstorm WatchSPCBath, Bell, Boone, Boyd, Bracken, Breathitt and 43 more6 hr
May 27, 3:50 PM CDTMesoscale DiscussionSPCAdair, Allen, Anderson, Ballard, Barren, Boyle and 53 more85 min
May 27, 5:13 PM CDTSevere Thunderstorm Watch PDSSPCAllen, Ballard, Butler, Caldwell, Calloway, Carlisle and 22 more7 hr
May 27, 9:59 AM CDTMesoscale DiscussionSPCBarton, Bates, Benton, Boone, Callaway, Camden and 47 more2 hr
May 27, 12:13 PM CDTTornado WatchSPCBarry, Barton, Bates, Benton, Bollinger, Boone and 61 more7 hr
May 27, 1:12 PM CDTMesoscale DiscussionSPCBarry, Barton, Bates, Benton, Bollinger, Camden and 50 more93 min
May 27, 3:29 PM CDTMesoscale DiscussionSPCBollinger, Butler, Carter, Crawford, Dent, Howell and 14 more91 min
May 27, 4:24 PM CDTMesoscale DiscussionSPCBollinger, Butler, Cape Girardeau, Carter, Dent, Iron and 8 more66 min
May 27, 5:56 PM CDTMesoscale DiscussionSPCBenton, Boone, Callaway, Camden, Cole, Cooper and 18 more64 min
May 27, 6:26 PM CDTSevere Thunderstorm WatchSPCBarton, Benton, Boone, Callaway, Camden, Cedar and 28 more3 hr
May 27, 7:49 AM CDTMesoscale DiscussionSPCBenton, Carroll, Chester, Crockett, Decatur, Dyer and 12 more86 min
May 27, 5:11 PM CDTMesoscale DiscussionSPCAnderson, Blount, Campbell, Carter, Claiborne, Cocke and 16 more64 min
May 27, 5:55 PM CDTSevere Thunderstorm WatchSPCAnderson, Bledsoe, Blount, Bradley, Campbell, Carter and 27 more9 hr

Nearby

Mesoscale Discussions in Tennessee, 2017Mesoscale Discussions in Arkansas, 2017Mesoscale Discussions in Mississippi, 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.