Alert archive / Kentucky / Mesoscale Discussions in 2017

Mesoscale Discussion 865

May 27, 20175 states

The Storm Prediction Center issued this mesoscale discussion at May 27, 2017, 1:16 PM CDT for 5 states. It was in force for 59 min.

The area

The outline as issued.

The facts

Issued
May 27, 2017, 1:16 PM CDT (18:16 UTC)
Expired
May 27, 2017, 2:15 PM CDT
In force
59 min
Issued by
the Storm Prediction Center
Chance of a watch
95%
All 69 counties

Alexander County, IL, Edwards County, IL, Franklin County, IL, Gallatin County, IL, Hamilton County, IL, Hardin County, IL, Jackson County, IL, Jefferson County, IL, Johnson County, IL, Massac County, IL, Perry County, IL, Pope County, IL, Pulaski County, IL, Saline County, IL, Union County, IL, Wabash County, IL, Washington County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Dubois County, IN, Gibson County, IN, Pike County, IN, Posey County, IN, Spencer County, IN, Vanderburgh County, IN, Warrick County, IN, Ballard County, KY, Caldwell County, KY, Calloway County, KY, Carlisle County, KY, Christian County, KY, Crittenden County, KY, Daviess County, KY, Fulton County, KY, Graves County, KY, Henderson County, KY, Hickman County, KY, Hopkins County, KY, Livingston County, KY, Lyon County, KY, Marshall County, KY, McCracken County, KY, McLean County, KY, Muhlenberg County, KY, Todd County, KY, Trigg County, KY, Union County, KY, Webster County, KY, Cape Girardeau County, MO, Mississippi County, MO, New Madrid County, MO, Pemiscot County, MO, Perry County, MO, Scott County, MO, Stoddard County, MO, Benton County, TN, Carroll County, TN, Crockett County, TN, Dyer County, TN, Gibson County, TN, Henry County, TN, Houston County, TN, Humphreys County, TN, Lake County, TN, Montgomery County, TN, Obion County, TN, Stewart County, TN, Weakley County, TN

The radar

The Paducah radar (KPAH), 27 km from the middle of the area, began a volume at 18:17 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

Nashville Metro, TN (KBNA), launched 12:00Z, 6.3 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-pSkew-T log-p diagram, Nashville Metro, TN at 12:00Z on 2017-05-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 825 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, Nashville Metro, TN at 12:00Z on 2017-05-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 154 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
825 J/kg
Mixed-layer CIN
-225 J/kg
Mixed-layer LCL
1026 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
154 m²/s²
0-3 km storm-relative helicity
196 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.1

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, 3:54 AM CDTMesoscale DiscussionSPCAlexander2 hr
May 27, 1:36 PM CDTSevere Thunderstorm WatchSPCAlexander, Clinton, Edwards, Franklin, Gallatin, Hamilton and 20 more7 hr
May 27, 3:50 PM CDTMesoscale DiscussionSPCAlexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 10 more85 min
May 27, 5:13 PM CDTSevere Thunderstorm Watch PDSSPCAlexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more7 hr
May 27, 6:26 PM CDTSevere Thunderstorm WatchSPCMonroe, Randolph3 hr
May 26, 7:09 PM CDTSevere Thunderstorm WatchSPCBartholomew, Boone, Carroll, Clinton, Decatur, Delaware and 23 more3 hr
May 26, 9:28 PM CDTMesoscale DiscussionSPCAdams, Bartholomew, Blackford, Boone, Brown, Carroll and 34 more92 min
May 27, 12:50 PM CDTMesoscale DiscussionSPCClark, Crawford, Dearborn, Floyd, Harrison, Jackson and 9 more85 min
May 27, 3:11 PM CDTSevere Thunderstorm WatchSPCOhio, Switzerland6 hr
May 27, 4:19 AM CDTSevere Thunderstorm WatchSPCFulton6 hr
May 27, 6:12 AM CDTMesoscale DiscussionSPCFulton2 hr
May 27, 9:13 AM CDTMesoscale DiscussionSPCAdair, Allen, Barren, Bell, Clinton, Cumberland and 12 more92 min
May 27, 12:06 AM CDTSevere Thunderstorm WatchSPCBarry, Christian, Douglas, Howell, McDonald, Oregon and 4 more5 hr
May 27, 2:04 AM CDTMesoscale DiscussionSPCBarry, Christian, Douglas, Howell, McDonald, Oregon and 4 more116 min
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, 6:17 PM CDTMesoscale DiscussionSPCHowell, Oregon, Ozark, Ripley, Taney58 min
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 Kentucky, 2017Mesoscale Discussions in Illinois, 2017Mesoscale Discussions in Tennessee, 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.