Alert archive / Kentucky / Mesoscale Discussions in 2003
Mesoscale Discussion 939
The Storm Prediction Center issued this mesoscale discussion at May 11, 2003, 4:16 AM CDT for 74 counties in Kentucky; Wayne County, West Virginia. It was in force for 59 min.
The area
The outline as issued.
The facts
- Issued
- May 11, 2003, 4:16 AM CDT (09:16 UTC)
- Expired
- May 11, 2003, 5:15 AM CDT
- In force
- 59 min
- Issued by
- the Storm Prediction Center
All 75 counties
Adair County, KY, Anderson County, KY, Barren County, KY, Bath County, KY, Bell County, KY, Bourbon County, KY, Boyd County, KY, Boyle County, KY, Bracken County, KY, Breathitt County, KY, Carter County, KY, Casey County, KY, Clark County, KY, Clay County, KY, Clinton County, KY, Cumberland County, KY, Elliott County, KY, Estill County, KY, Fayette County, KY, Fleming County, KY, Floyd County, KY, Franklin County, KY, Garrard County, KY, Grant County, KY, Green County, KY, Greenup County, KY, Harlan County, KY, Harrison County, KY, Jackson County, KY, Jessamine County, KY, Johnson County, KY, Knott County, KY, Knox County, KY, Laurel County, KY, Lawrence County, KY, Lee County, KY, Leslie County, KY, Letcher County, KY, Lewis County, KY, Lincoln County, KY, Madison County, KY, Magoffin County, KY, Marion County, KY, Martin County, KY, Mason County, KY, McCreary County, KY, Menifee County, KY, Mercer County, KY, Metcalfe County, KY, Monroe County, KY, Montgomery County, KY, Morgan County, KY, Nelson County, KY, Nicholas 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, Spencer County, KY, Taylor County, KY, Washington County, KY, Wayne County, KY, Whitley County, KY, Wolfe County, KY, Woodford County, KY, Wayne County, WV
The radar
The Jackson,KY radar (KJKL), 83 km from the middle of the area, began a volume at 09:16 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 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, 9.3 hours before the alert went out and 209 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
- 1265 J/kg
- Mixed-layer CIN
- -64 J/kg
- Mixed-layer LCL
- 897 m above ground
- 0-6 km bulk shear
- 71 kt
- 0-1 km storm-relative helicity
- 411 m²/s²
- 0-3 km storm-relative helicity
- 392 m²/s²
- Significant tornado parameter
- 3.2
- Supercell composite
- 17.0
The text
As transmitted, in the capitals the NWS used until 2016.
282 ACUS11 KWNS 110917 SWOMCD SPC MCD 110916 WVZ000-KYZ000-VAZ000-OHZ000-TNZ000-111015- MESOSCALE DISCUSSION 0939 NWS STORM PREDICTION CENTER NORMAN OK 0416 AM CDT SUN MAY 11 2003 AREAS AFFECTED...CNTRL AND ERN KY CONCERNING...SEVERE THUNDERSTORM POTENTIAL VALID 110916Z - 111015Z DAMAGING WIND/ISOLATED TORNADO THREAT IS EXPECTED TO PERSIST ACROSS CNTRL AND ERN KY FOR THE NEXT FEW HOURS. LOUISVILLE KY RADAR DATA INDICATES DISCRETE STORMS /PERIODICALLY EXHIBITING SUPERCELL CHARACTERISTICS/ OVER HART/GREEN COUNTIES IN CNTRL KY AND AND COMMA HEAD ON THE N SIDE OF A SHORT SEGMENTED BOW ECHO OVER CLAY COUNTY IN NRN TN. JACKSON KY VWP INDICATES FAVORABLE DIRECTION/SPEED SHEAR PROFILES FOR ORGANIZED TSTMS...INCLUDING SUPERCELLS WITH 0-2KM SRH OF 400 M2/S2 AND 0-6KM AGL SHEAR OF 30 M/S. THE AIRMASS AHEAD OF THE ONGOING CONVECTION REMAINS MODERATELY UNSTABLE WITH MLCAPES OF 1000-2000 J/KG AND GIVEN THE FAVORABLE WIND SHEAR...IT APPEARS THAT THE SEVERE WEATHER THREAT WILL CONTINUE ACROSS CNTRL AND ERN KY FOR THE NEXT 2 TO 4 HOURS. ALTHOUGH DAMAGING WINDS WILL REMAIN THE PRIMARY SEVERE WEATHER THREAT...ISOLATED TORNADOES WILL ALSO BE POSSIBLE WITH THE AFOREMENTIONED DISCRETE STORMS. A NEW WW WILL LIKELY BE REQUIRED SHORTLY. ..MEAD.. 05/11/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...RLX...MRX...JKL...ILN...LMK...OHX... 36668598 37058592 37748553 38388519 38788473 38748387 38668339 38568289 38098236 37498233 37168260 36638341 36618420 36618548
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 10, 7:06 PM CDT | Mesoscale Discussion | SPC | Ballard, Calloway, Carlisle, Crittenden, Fulton, Graves and 5 more | 54 min |
| May 10, 8:28 PM CDT | Mesoscale Discussion | SPC | Breathitt, Floyd, Johnson, Knott, Magoffin, Martin and 1 more | 62 min |
| May 10, 8:45 PM CDT | Tornado Watch | SPC | Ballard, Carlisle, Fulton, Graves, Hickman, Livingston and 2 more | 5 hr |
| May 10, 9:10 PM CDT | Tornado Watch | SPC | Oldham | 5 hr |
| May 10, 10:04 PM CDT | Mesoscale Discussion | SPC | Allen, Barren, Breckinridge, Butler, Caldwell, Calloway and 23 more | 116 min |
| May 10, 11:20 PM CDT | Tornado Watch | SPC | Adair, Allen, Anderson, Barren, Bourbon, Boyle and 38 more | 6 hr |
| May 10, 11:28 PM CDT | Mesoscale Discussion | SPC | Boone, Bracken, Campbell, Carroll, Gallatin, Grant and 2 more | 2 hr |
| May 11, 1:46 AM CDT | Mesoscale Discussion | SPC | Allen, Anderson, Barren, Bourbon, Boyle, Breckinridge and 46 more | 89 min |
| May 11, 5:05 AM CDT | Severe Thunderstorm Watch | SPC | Bath, Bell, Bourbon, Boyle, Breathitt, Casey and 38 more | 4 hr |
| May 11, 5:55 AM CDT | Severe Thunderstorm Watch | SPC | Bell, Harlan | 5 hr |
| May 11, 9:30 AM CDT | Mesoscale Discussion | SPC | Brooke, Doddridge, Hancock, Harrison, Marion, Marshall and 9 more | 2 hr |
| May 11, 10:45 AM CDT | Tornado Watch | SPC | Brooke, Hancock, Marshall, Monongalia, Ohio, Wetzel | 5 hr |
| May 11, 1:52 PM CDT | Mesoscale Discussion | SPC | Brooke, Hancock, Marshall, Monongalia, Ohio, Wetzel | 113 min |
| May 11, 2:18 PM CDT | Mesoscale Discussion | SPC | Berkeley, Jefferson, Morgan | 117 min |
Nearby
Mesoscale Discussions in Kentucky, 2003Mesoscale Discussions in West Virginia, 2003Every mesoscale discussion in 2003
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.