Alert archive / Kentucky / Mesoscale Discussions in 2016

Mesoscale Discussion 615

May 11, 20164 states

The Storm Prediction Center issued this mesoscale discussion at May 11, 2016, 11:28 PM CDT for 4 states. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued
May 11, 2016, 11:28 PM CDT (04:28 UTC)
Expired
May 12, 2016, 1:00 AM CDT
In force
92 min
Issued by
the Storm Prediction Center
All 51 counties

Alexander County, IL, Franklin County, IL, Gallatin County, IL, Hamilton County, IL, Hardin County, IL, Jackson County, IL, Johnson County, IL, Massac County, IL, Pope County, IL, Pulaski County, IL, Saline County, IL, Union County, IL, White County, IL, Williamson County, IL, Posey County, IN, Vanderburgh County, IN, Ballard County, KY, Butler County, KY, Caldwell County, KY, Carlisle County, KY, Christian County, KY, Crittenden County, KY, Daviess County, KY, Edmonson County, KY, Graves County, KY, Grayson County, KY, Hancock County, KY, Henderson County, KY, Hopkins County, KY, Livingston County, KY, Logan County, KY, Lyon County, KY, Marshall County, KY, McCracken County, KY, McLean County, KY, Muhlenberg County, KY, Ohio County, KY, Simpson County, KY, Todd County, KY, Trigg County, KY, Union County, KY, Warren County, KY, Webster County, KY, Bollinger County, MO, Cape Girardeau County, MO, Iron County, MO, Madison County, MO, Mississippi County, MO, Perry County, MO, Scott County, MO, Wayne County, MO

The radar

The Paducah radar (KPAH), 57 km from the middle of the area, began a volume at 04:31 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

Nashville Metro, TN (KBNA), launched 00:00Z, 4.5 hours before the alert went out and 212 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 00:00Z on 2016-05-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 541 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Nashville Metro, TN at 00:00Z on 2016-05-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 71 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
541 J/kg
Mixed-layer CIN
-58 J/kg
Mixed-layer LCL
2087 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
71 m²/s²
0-3 km storm-relative helicity
89 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

867 
ACUS11 KWNS 120428
SWOMCD
SPC MCD 120428 
KYZ000-INZ000-TNZ000-ILZ000-MOZ000-120600-

MESOSCALE DISCUSSION 0615
NWS STORM PREDICTION CENTER NORMAN OK
1128 PM CDT WED MAY 11 2016

AREAS AFFECTED...ERN MO...WRN AND SRN IL...WRN KY

CONCERNING...SEVERE THUNDERSTORM WATCH 171...

VALID 120428Z - 120600Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 171
CONTINUES.

SUMMARY...A THREAT FOR ISOLATED DAMAGING WIND AND HAIL WILL BE
POSSIBLE WITH THE STRONGER THUNDERSTORMS ACROSS SE MO...SRN IL INTO
FAR WRN KY FOR A COUPLE MORE HOURS. THE THREAT WILL LIKELY CONTINUE
BEYOND THE WATCH EXPIRATION AND A LOCAL EXTENSION MAY BE NEEDED.
ADDITIONAL WW ISSUANCE IS NOT ANTICIPATED.

DISCUSSION...LATEST RADAR TRENDS SHOW A BOWING LINE SEGMENT OVER FAR
SRN IL THAT HAS BEEN SUSTAINED IN INTENSITY OVER THE LAST FEW HOURS.
THIS BOWING LINE IS LOCATED ALONG A TIGHT GRADIENT OF MODERATE
INSTABILITY NEAR AN OUTFLOW BOUNDARY LEFT OVER FROM PREVIOUS
CONVECTION. AS THE LINE CONTINUES TO MOVE ESEWD...A MAX IN LOW-LEVEL
FLOW WHICH IS ANALYZED BY THE RAP NEAR THE IL-KY STATELINE...WILL
HELP TO SUSTAIN STRONG UPDRAFTS WITHIN THE BOWING LINE SEGMENT.
MODERATE DEEP-LAYER SHEAR EVIDENT ON REGIONAL WSR-88D VWPS ALONG
WITH AN ESEWD MOVEMENT AT 35 KT WILL MAKE DAMAGING WIND GUSTS A
POSSIBILITY WITH THE STRONGER PARTS OF THE LINE. THIS THREAT SHOULD
PERSIST AND A LOCAL EXTENSION MAY BE NEEDED FOR A COUPLE MORE HOURS.

..BROYLES/THOMPSON.. 05/12/2016

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...LMK...OHX...PAH...LSX...

LAT...LON   38328871 37798997 37639079 37229090 36838957 36588755
            36568667 37038594 37578595 37948685 38328871

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 11, 8:24 PM CDTMesoscale DiscussionSPCClark, Jefferson, Scott, Switzerland96 min
May 12, 9:10 AM CDTMesoscale DiscussionSPCCalloway, Fulton95 min
May 11, 8:11 PM CDTMesoscale DiscussionSPCBarry, Christian, Douglas, Greene, Howell, Lawrence and 8 more3 hr
May 12, 2:48 AM CDTMesoscale DiscussionSPCDunklin87 min

Nearby

Mesoscale Discussions in Kentucky, 2016Mesoscale Discussions in Illinois, 2016Mesoscale Discussions in Missouri, 2016Every mesoscale discussion in 2016

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.