Alert archive / Kentucky / Mesoscale Discussions in 2011
Mesoscale Discussion 644
The Storm Prediction Center issued this mesoscale discussion at Apr 27, 2011, 9:22 PM EDT for 5 states. It was in force for 53 min.
The area
The outline as issued.
The facts
- Issued
- Apr 27, 2011, 9:22 PM EDT (01:22 UTC)
- Expired
- Apr 27, 2011, 10:15 PM EDT
- In force
- 53 min
- Issued by
- the Storm Prediction Center
All 235 counties
Adams County, IN, Bartholomew County, IN, Blackford County, IN, Boone County, IN, Brown County, IN, Carroll County, IN, Cass County, IN, Clark County, IN, Clay County, IN, Clinton County, IN, Crawford County, IN, Daviess County, IN, Dearborn County, IN, Decatur County, IN, Delaware County, IN, Dubois County, IN, Fayette County, IN, Floyd County, IN, Fountain County, IN, Franklin County, IN, Grant County, IN, Greene County, IN, Hamilton County, IN, Hancock County, IN, Harrison County, IN, Hendricks County, IN, Henry County, IN, Howard County, IN, Huntington County, IN, Jackson County, IN, Jay County, IN, Jefferson County, IN, Jennings County, IN, Johnson County, IN, Knox County, IN, Lawrence County, IN, Madison County, IN, Marion County, IN, Martin County, IN, Miami County, IN, Monroe County, IN, Montgomery County, IN, Morgan County, IN, Ohio County, IN, Orange County, IN, Owen County, IN, Parke County, IN, Perry County, IN, Pike County, IN, Putnam County, IN, Randolph County, IN, Ripley County, IN, Rush County, IN, Scott County, IN, Shelby County, IN, Spencer County, IN, Sullivan County, IN, Switzerland County, IN, Tippecanoe County, IN, Tipton County, IN, Union County, IN, Vermillion County, IN, Vigo County, IN, Wabash County, IN, Washington County, IN, Wayne County, IN, Wells County, IN, Adair County, KY, Allen County, KY, Anderson County, KY, Barren County, KY, Bath County, KY, Bell County, KY, Boone County, KY, Bourbon County, KY, Boyd County, KY, Boyle County, KY, Bracken County, KY, Breathitt County, KY, Breckinridge County, KY, Bullitt County, KY, Butler County, KY, Campbell County, KY, Carroll County, KY, Carter County, KY, Casey County, KY, Clark County, KY, Clay County, KY, Clinton County, KY, Cumberland County, KY, Daviess County, KY, Edmonson County, KY, Elliott County, KY, Estill County, KY, Fayette County, KY, Fleming County, KY, Floyd County, KY, Franklin County, KY, Gallatin County, KY, Garrard County, KY, Grant County, KY, Grayson County, KY, Green County, KY, Greenup County, KY, Hancock County, KY, Hardin County, KY, Harlan County, KY, Harrison County, KY, Hart County, KY, Henry County, KY, Jackson County, KY, Jefferson County, KY, Jessamine County, KY, Johnson County, KY, Kenton County, KY, Knott County, KY, Knox County, KY, Larue County, KY, Laurel County, KY, Lawrence County, KY, Lee County, KY, Leslie County, KY, Letcher County, KY, Lewis County, KY, Lincoln County, KY, Logan County, KY, Madison County, KY, Magoffin County, KY, Marion County, KY, Martin County, KY, Mason County, KY, McCreary County, KY, McLean County, KY, Meade County, KY, Menifee County, KY, Mercer County, KY, Metcalfe County, KY, Monroe County, KY, Montgomery County, KY, Morgan County, KY, Muhlenberg County, KY, Nelson County, KY, Nicholas County, KY, Ohio County, KY, Oldham County, KY, Owen County, KY, Owsley County, KY, Pendleton County, KY, Perry County, KY, Pike County, KY, Powell County, KY, Pulaski County, KY, Robertson County, KY, Rockcastle County, KY, Rowan County, KY, Russell County, KY, Scott County, KY, Shelby County, KY, Simpson County, KY, Spencer County, KY, Taylor County, KY, Todd County, KY, Trimble County, KY, Warren County, KY, Washington County, KY, Wayne County, KY, Whitley County, KY, Wolfe County, KY, Woodford County, KY, Adams County, OH, Allen County, OH, Auglaize County, OH, Brown County, OH, Butler County, OH, Champaign County, OH, Clark County, OH, Clermont County, OH, Clinton County, OH, Crawford County, OH, Darke County, OH, Delaware County, OH, Fairfield County, OH, Fayette County, OH, Franklin County, OH, Greene County, OH, Hamilton County, OH, Hancock County, OH, Hardin County, OH, Highland County, OH, Hocking County, OH, Knox County, OH, Lawrence County, OH, Licking County, OH, Logan County, OH, Madison County, OH, Marion County, OH, Mercer County, OH, Miami County, OH, Montgomery County, OH, Morrow County, OH, Pickaway County, OH, Pike County, OH, Preble County, OH, Putnam County, OH, Richland County, OH, Ross County, OH, Scioto County, OH, Shelby County, OH, Union County, OH, Van Wert County, OH, Warren County, OH, Wyandot County, OH, Buchanan County, VA, City of Bristol, VA, City of Norton, VA, Dickenson County, VA, Lee County, VA, Russell County, VA, Scott County, VA, Smyth County, VA, Tazewell County, VA, Washington County, VA, Wise County, VA, Boone County, WV, Cabell County, WV, Fayette County, WV, Kanawha County, WV, Lincoln County, WV, Logan County, WV, McDowell County, WV, Mingo County, WV, Putnam County, WV, Raleigh County, WV, Wayne County, WV, Wyoming County, WV
The radar
The Cincinnati radar (KILN), 92 km from the middle of the area, began a volume at 01:22 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
Cncnati-Daytn, OH (KILN), launched 00:00Z, 1.4 hours before the alert went out and 93 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 775 m above ground
- 0-6 km bulk shear
- 70 kt
- 0-1 km storm-relative helicity
- 96 m²/s²
- 0-3 km storm-relative helicity
- 521 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.5
The text
As transmitted, in the capitals the NWS used until 2016.
523
ACUS11 KWNS 280122
SWOMCD
SPC MCD 280122
WVZ000-VAZ000-NCZ000-TNZ000-KYZ000-OHZ000-INZ000-ILZ000-280215-
MESOSCALE DISCUSSION 0644
NWS STORM PREDICTION CENTER NORMAN OK
0822 PM CDT WED APR 27 2011
AREAS AFFECTED...KY...IND...WRN AND CENTRAL OH...WRN WV...AND SWRN
VA
CONCERNING...TORNADO WATCH 239...242...
VALID 280122Z - 280215Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 239...242...CONTINUES.
EARLY-MID EVENING SURFACE ANALYSIS INDICATED AN AREA OF LOW PRESSURE
CONTINUING TO TRACK NEWD INTO SWRN IND ALONG A QUASI-STATIONARY
BOUNDARY WHICH EXTENDED NEWD ACROSS CENTRAL-ERN IND INTO NWRN OH.
MEANWHILE...A COLD FRONT TRAILED SWD FROM THE LOW THROUGH WRN TN
INTO MS...BISECTING MS GENERALLY FROM NE-SW.
CLOUDINESS ACROSS MUCH WW/S 239 AND 242 HAVE MITIGATED STRONGER
INSTABILITY FROM DEVELOPING WITH THE GREATEST INSTABILITY /MUCAPE TO
AROUND 1000 J PER KG/ EXTENDING ACROSS ERN KY INTO SRN OH. THIS
CORRIDOR OF INSTABILITY IS LOCATED ALONG A STRONG SLY LLJ /50-70 KT/
WHICH WILL CONTINUE TO PROVIDE NWD MOISTURE ADVECTION/
DESTABILIZATION INTO ERN KY/SRN OH DESPITE THE ONSET OF DIABATIC
COOLING. GREATEST SEVERE WEATHER THREAT THROUGH THE EVENING SHOULD
BE CONFINED TO THE ERN HALF OF KY INTO PARTS OF SRN OH GIVEN THE
AFOREMENTIONED FACTORS. HOWEVER...AREAS FARTHER NW-N ALONG THE
TRACK OF THE SURFACE LOW INTO IND WILL HAVE A CONDITIONAL TORNADO
TREAT DESPITE WEAKER INSTABILITY. ISALLOBARIC EFFECT OF THE SURFACE
WINDS DUE TO SURFACE PRESSURE FALLS OVER IND INTO WRN KY SHOULD
MAINTAIN A SELY COMPONENT AND ENHANCE LOW LEVEL SHEAR...ESPECIALLY
ALONG AND ESE OF THE SURFACE LOW TRACK.
..PETERS.. 04/28/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...RNK...RLX...CLE...MRX...JKL...ILN...LMK...IWX...
OHX...IND...PAH...ILX...
LAT...LON 36678708 36968758 38198723 38688755 40138747 40948636
40998434 41138354 40898241 40358222 39408238 39008280
38708252 38598160 38158105 37988077 37368131 36748140
36558171 36588489 36678708SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 28, 1:38 PM EDT | Mesoscale Discussion | SPC | Bartholomew, Brown, Clark, Clay, Crawford, Daviess and 42 more | 97 min |
| Apr 28, 12:51 AM EDT | Mesoscale Discussion | SPC | Allen, Fulton, Hancock, Henry, Lucas, Putnam and 1 more | 54 min |
| Apr 28, 3:19 AM EDT | Mesoscale Discussion | SPC | Ashland, Belmont, Carroll, Columbiana, Coshocton, Crawford and 22 more | 56 min |
| Apr 27, 10:12 PM EDT | Mesoscale Discussion | SPC | Albemarle, Alleghany, Amelia, Amherst, Appomattox, Arlington and 68 more | 63 min |
| Apr 28, 12:27 AM EDT | Mesoscale Discussion | SPC | Albemarle, Alleghany, Amherst, Appomattox, Arlington, Augusta and 65 more | 63 min |
| Apr 28, 12:34 AM EDT | Mesoscale Discussion | SPC | Buchanan, Dickenson, Lee, Russell, Scott, Tazewell and 3 more | 26 min |
| Apr 28, 12:41 AM EDT | Tornado Watch | SPC | Albemarle, Alleghany, Amelia, Amherst, Appomattox, Arlington and 78 more | 7 hr |
| Apr 28, 7:38 AM EDT | Tornado Watch | SPC | Accomack, Albemarle, Amelia, Amherst, Appomattox, Arlington and 83 more | 7 hr |
| Apr 28, 10:44 AM EDT | Mesoscale Discussion | SPC | Albemarle, Amelia, Amherst, Appomattox, Arlington, Bedford and 69 more | 61 min |
| Apr 28, 2:00 PM EDT | Mesoscale Discussion | SPC | Accomack, Amelia, Arlington, Brunswick, Caroline, Charles City and 47 more | 60 min |
| Apr 28, 2:41 PM EDT | Tornado Watch | SPC | Accomack, Charles City, Essex, Gloucester, Greensville, Isle of Wight and 30 more | 6 hr |
| Apr 28, 6:33 PM EDT | Mesoscale Discussion | SPC | Accomack, Charles City, Essex, Gloucester, Greensville, Henrico and 31 more | 57 min |
Nearby
Mesoscale Discussions in Kentucky, 2011Mesoscale Discussions in Indiana, 2011Mesoscale Discussions in Ohio, 2011Every mesoscale discussion in 2011
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.