Alert archive / Kentucky / Mesoscale Discussions in 2004
Mesoscale Discussion 474
The Storm Prediction Center issued this mesoscale discussion at Apr 24, 2004, 9:51 PM CDT for 4 states. It was in force for 54 min.
The area
The outline as issued.
The facts
- Issued
- Apr 24, 2004, 9:51 PM CDT (02:51 UTC)
- Expired
- Apr 24, 2004, 10:45 PM CDT
- In force
- 54 min
- Issued by
- the Storm Prediction Center
All 59 counties
Gallatin County, IL, Hardin County, IL, Johnson County, IL, Massac County, IL, Pope County, IL, Saline 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, Allen County, KY, Ballard County, KY, Butler 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, Hancock County, KY, Henderson County, KY, Hickman 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, Benton County, TN, Carroll County, TN, Cheatham County, TN, Crockett County, TN, Dickson County, TN, Gibson County, TN, Henry County, TN, Houston County, TN, Humphreys County, TN, Montgomery County, TN, Obion County, TN, Robertson County, TN, Stewart County, TN, Sumner County, TN, Weakley County, TN
The radar
The Paducah radar (KPAH), 64 km from the middle of the area, began a volume at 02:51 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, 2.9 hours before the alert went out and 162 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
- 81 J/kg
- Mixed-layer CIN
- -23 J/kg
- Mixed-layer LCL
- 1676 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 47 m²/s²
- 0-3 km storm-relative helicity
- 68 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted, in the capitals the NWS used until 2016.
666 ACUS11 KWNS 250252 SWOMCD SPC MCD 250251 TNZ000-KYZ000-INZ000-ILZ000-MOZ000-250345- MESOSCALE DISCUSSION 0474 NWS STORM PREDICTION CENTER NORMAN OK 0951 PM CDT SAT APR 24 2004 AREAS AFFECTED...SRN IL/SWRN IL/WRN IN/WRN AND MIDDLE TN CONCERNING...TORNADO WATCH 120... VALID 250251Z - 250345Z BROKEN LINE OF STRONG CONVECTION CONTINUES MOVING EAST 25-30KT FROM SRN IL INTO WRN KY AND TN. STORMS HAVE SHOWN A DRAMATIC DECREASE IN INTENSITY AND HAVE BECOME LESS ORGANIZED OVER THE PAST HOUR AS DIURNAL COOLING SETS IN AND CONVECTIVE INHIBITION INCREASES. THIS SHOULD RESULT IN DIMINISHING WIND/TORNADO POTENTIAL AND WW WILL LIKELY BE CANCELED EARLY IF THIS TREND CONTINUES OVER THE NEXT HOUR. ..CARBIN.. 04/25/2004 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...LMK...OHX...IND...PAH...MEG... 35568950 37968888 38598684 36548606 35648898
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 24, 8:15 PM CDT | Mesoscale Discussion | SPC | Alexander, Gallatin, Hardin, Jackson, Johnson, Massac and 6 more | 60 min |
Nearby
Mesoscale Discussions in Kentucky, 2004Mesoscale Discussions in Tennessee, 2004Mesoscale Discussions in Illinois, 2004Every mesoscale discussion in 2004
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.