Alert archive / Kentucky / Mesoscale Discussions in 2004
Mesoscale Discussion 955
The Storm Prediction Center issued this mesoscale discussion at May 27, 2004, 7:12 PM CDT for 5 states. It was in force for 93 min.
The area
The outline as issued.
The facts
- Issued
- May 27, 2004, 7:12 PM CDT (00:12 UTC)
- Expired
- May 27, 2004, 8:45 PM CDT
- In force
- 93 min
- Issued by
- the Storm Prediction Center
All 130 counties
Alexander County, IL, Clay County, IL, Clinton County, IL, Edwards County, IL, Franklin County, IL, Gallatin County, IL, Hamilton County, IL, Hardin County, IL, Jackson County, IL, Jefferson County, IL, Johnson County, IL, Lawrence County, IL, Marion County, IL, Massac County, IL, Monroe County, IL, Perry County, IL, Pope County, IL, Pulaski County, IL, Randolph County, IL, Richland County, IL, Saint Clair County, IL, Saline County, IL, Union County, IL, Wabash County, IL, Washington County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Crawford County, IN, Daviess County, IN, Dubois County, IN, Floyd County, IN, Gibson County, IN, Harrison County, IN, Knox County, IN, Orange County, IN, Perry County, IN, Pike County, IN, Posey County, IN, Spencer County, IN, Vanderburgh County, IN, Warrick County, IN, Allen County, KY, Ballard County, KY, Barren County, KY, Breckinridge County, KY, Bullitt County, KY, Butler County, KY, Caldwell County, KY, Calloway County, KY, Carlisle County, KY, Christian County, KY, Crittenden County, KY, Daviess County, KY, Edmonson County, KY, Fulton County, KY, Graves County, KY, Grayson County, KY, Green County, KY, Hancock County, KY, Hardin County, KY, Hart County, KY, Henderson County, KY, Hickman County, KY, Hopkins County, KY, Jefferson County, KY, Larue County, KY, Livingston County, KY, Logan County, KY, Lyon County, KY, Marshall County, KY, McCracken County, KY, McLean County, KY, Meade County, KY, Metcalfe County, KY, Monroe County, KY, Muhlenberg County, KY, Nelson 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, Butler County, MO, Camden County, MO, Cape Girardeau County, MO, Carter County, MO, City of Saint Louis, MO, Cole County, MO, Crawford County, MO, Dallas County, MO, Dent County, MO, Douglas County, MO, Franklin County, MO, Gasconade County, MO, Howell County, MO, Iron County, MO, Jefferson County, MO, Laclede County, MO, Madison County, MO, Maries County, MO, Miller County, MO, Mississippi County, MO, Morgan County, MO, New Madrid County, MO, Oregon County, MO, Osage County, MO, Perry County, MO, Phelps County, MO, Pulaski County, MO, Reynolds County, MO, Ripley County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Scott County, MO, Shannon County, MO, Stoddard County, MO, Texas County, MO, Warren County, MO, Washington County, MO, Wayne County, MO, Wright County, MO, Montgomery County, TN, Robertson County, TN, Stewart County, TN
The radar
The St Louis radar (KLSX), 122 km from the middle of the area, began a volume at 00:02 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
Lincoln, IL (KILX), launched 00:00Z, 0.2 hours before the alert went out and 273 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
- 651 J/kg
- Mixed-layer CIN
- -12 J/kg
- Mixed-layer LCL
- 1078 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- -105 m²/s²
- 0-3 km storm-relative helicity
- 52 m²/s²
- Significant tornado parameter
- -0.4
- Supercell composite
- -3.6
The text
As transmitted, in the capitals the NWS used until 2016.
991 ACUS11 KWNS 280013 SWOMCD SPC MCD 280012 KYZ000-TNZ000-INZ000-ILZ000-MOZ000-280145- MESOSCALE DISCUSSION 0955 NWS STORM PREDICTION CENTER NORMAN OK 0712 PM CDT THU MAY 27 2004 AREAS AFFECTED...SERN MO EWD INTO WRN KY CONCERNING...SEVERE THUNDERSTORM WATCH 310...312... VALID 280012Z - 280145Z ENVIRONMENT AHEAD OF ONGOING STORMS IS FAVORABLE FOR TORNADOES...AND A TORNADO WATCH WILL BE ISSUED SHORTLY. THIS WATCH WILL REPLACE WW 310 AND 312. LATEST SURFACE ANALYSIS SHOWS PRESSURE FALLS AHEAD OF E-W FRONTAL BOUNDARY WHERE SEVERE STORMS ARE ONGOING. LOW LEVEL THETA-E ADVECTION...ALONG WITH UPPER HEIGHT FALLS WITH WEAK TROUGH AXIS WILL CONTINUE TO FORCE NEW CELL DEVELOPMENT WITHIN WARM FRONTAL ZONE AND POSSIBLE JUST SOUTH OF BOUNDARY. AREA VWPS AND PROFILERS INDICATE 0-1 SRH VALUES APPROACHING 200 M2/S2 OVER SERN MO EWD INTO KY. THIS COMBINED WITH STRONG INSTABILITY WILL ALLOW FOR THE FORMATION OF ISOLATED TORNADOES WHERE OUTFLOW HAS NOT UNDERCUT UPDRAFT. DAMAGING WINDS WILL CONTINUE TO BE A THREAT AS WELL. ..JEWELL.. 05/28/2004 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...LMK...OHX...IND...PAH...ILX...MEG...LSX...SGF... 36559222 37499300 38479323 38669198 38899064 38798951 38848859 38758732 38338542 36668540 36458762
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 27, 7:40 PM CDT | Tornado Watch | SPC | Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 15 more | 5 hr |
| May 27, 10:27 PM CDT | Mesoscale Discussion | SPC | Alexander, Gallatin, Hardin, Johnson, Massac, Pope and 3 more | 93 min |
| May 27, 7:15 PM CDT | Severe Thunderstorm Watch | SPC | Dearborn, Delaware, Fayette, Franklin, Henry, Randolph and 3 more | 5 hr |
| May 27, 8:53 PM CDT | Mesoscale Discussion | SPC | Boyle, Breathitt, Casey, Clay, Estill, Floyd and 21 more | 97 min |
| May 27, 9:30 PM CDT | Tornado Watch | SPC | Bell, Boyle, Breathitt, Casey, Clay, Clinton and 30 more | 6 hr |
| May 27, 9:39 PM CDT | Mesoscale Discussion | SPC | Anderson, Bath, Bourbon, Boyd, Carter, Elliott and 15 more | 96 min |
| May 27, 11:17 PM CDT | Mesoscale Discussion | SPC | Anderson, Bath, Bell, Bourbon, Boyd, Boyle and 50 more | 58 min |
| May 27, 9:08 PM CDT | Mesoscale Discussion | SPC | Cedar, Christian, Dade, Dallas, Dent, Douglas and 13 more | 97 min |
Nearby
Mesoscale Discussions in Kentucky, 2004Mesoscale Discussions in Missouri, 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.