Alert archive / Kentucky / Mesoscale Discussions in 2004

Mesoscale Discussion 2325

October 18, 20048 counties in Illinois; 18 counties in Kentucky; Stewart County, Tennessee

The Storm Prediction Center issued this mesoscale discussion at Oct 18, 2004, 1:55 PM CDT for 8 counties in Illinois; 18 counties in Kentucky; Stewart County, Tennessee. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued
Oct 18, 2004, 1:55 PM CDT (18:55 UTC)
Expired
Oct 18, 2004, 3:30 PM CDT
In force
95 min
Issued by
the Storm Prediction Center
All 27 counties

Gallatin County, IL, Hardin County, IL, Johnson County, IL, Massac County, IL, Pope County, IL, Pulaski County, IL, Saline County, IL, Williamson County, IL, Ballard County, KY, Caldwell County, KY, Calloway County, KY, Carlisle County, KY, Christian County, KY, Crittenden 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, Trigg County, KY, Union County, KY, Webster County, KY, Stewart County, TN

The radar

The Paducah radar (KPAH), 20 km from the middle of the area, began a volume at 18:58 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, 6.9 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 2004-10-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 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 2004-10-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 198 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
920 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
198 m²/s²
0-3 km storm-relative helicity
142 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Oct 17, 10:01 PM CDTMesoscale DiscussionSPCMonroe, Randolph3 hr
Oct 17, 11:30 PM CDTSevere Thunderstorm WatchSPCMonroe, Randolph, Saint Clair6 hr
Oct 18, 2:19 AM CDTMesoscale DiscussionSPCAlexander, Monroe, Randolph, Saint Clair56 min
Oct 18, 4:40 AM CDTMesoscale DiscussionSPCAlexander, Bond, Calhoun, Clay, Clinton, Fayette and 16 more35 min
Oct 18, 7:44 AM CDTMesoscale DiscussionSPCAlexander, Massac, Pulaski61 min
Oct 18, 10:20 AM CDTMesoscale DiscussionSPCAlexander, Bond, Clay, Clinton, Edwards, Effingham and 27 more85 min
Oct 18, 12:04 PM CDTMesoscale DiscussionSPCAlexander, Jackson, Monroe, Pulaski, Randolph, Union86 min
Oct 18, 12:40 PM CDTTornado WatchSPCAlexander, Clinton, Jackson, Monroe, Perry, Randolph and 2 more5 hr
Oct 18, 3:41 PM CDTMesoscale DiscussionSPCAlexander, Clinton, Jackson, Monroe, Perry, Randolph and 3 more94 min
Oct 18, 5:05 PM CDTTornado WatchSPCAlexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 17 more5 hr
Oct 18, 6:05 PM CDTMesoscale DiscussionSPCBond, Clay, Clinton, Crawford, Edwards, Effingham and 23 more115 min
Oct 18, 9:45 AM CDTTornado WatchSPCFayette, Hardeman, McNairy, Shelby5 hr
Oct 18, 11:29 AM CDTMesoscale DiscussionSPCFayette, Hardeman, McNairy, Shelby91 min
Oct 18, 2:18 PM CDTMesoscale DiscussionSPCFayette, Hardeman, McNairy, Shelby57 min
Oct 18, 3:20 PM CDTTornado WatchSPCFranklin, Giles, Lincoln5 hr
Oct 18, 4:05 PM CDTTornado WatchSPCCarroll, Chester, Crockett, Dyer, Fayette, Gibson and 12 more5 hr
Oct 18, 6:02 PM CDTMesoscale DiscussionSPCFranklin, Giles, Lawrence, Lincoln, Moore, Wayne88 min

Nearby

Mesoscale Discussions in Kentucky, 2004Mesoscale Discussions in Illinois, 2004Mesoscale Discussions in Tennessee, 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.