Alert archive / Indiana / Mesoscale Discussions in 2004
Mesoscale Discussion 941
The Storm Prediction Center issued this mesoscale discussion at May 27, 2004, 1:07 PM CDT for 4 states. It was in force for 113 min.
The area
The outline as issued.
The facts
- Issued
- May 27, 2004, 1:07 PM CDT (18:07 UTC)
- Expired
- May 27, 2004, 3:00 PM CDT
- In force
- 113 min
- Issued by
- the Storm Prediction Center
All 61 counties
Champaign County, IL, Clark County, IL, Coles County, IL, DeWitt County, IL, Douglas County, IL, Edgar County, IL, Ford County, IL, Fulton County, IL, Logan County, IL, Macon County, IL, Mason County, IL, McLean County, IL, Menard County, IL, Moultrie County, IL, Piatt County, IL, Sangamon County, IL, Tazewell County, IL, Vermilion County, IL, Bartholomew County, IN, Boone County, IN, Brown County, IN, Clay County, IN, Dearborn County, IN, Decatur County, IN, Fayette County, IN, Fountain County, IN, Franklin County, IN, Greene County, IN, Hancock County, IN, Hendricks County, IN, Jackson County, IN, Jefferson County, IN, Jennings County, IN, Johnson County, IN, Marion County, IN, Monroe County, IN, Montgomery County, IN, Morgan County, IN, Ohio County, IN, Owen County, IN, Parke County, IN, Putnam County, IN, Ripley County, IN, Rush County, IN, Scott County, IN, Shelby County, IN, Sullivan County, IN, Switzerland County, IN, Union County, IN, Vermillion County, IN, Vigo County, IN, Warren County, IN, Boone County, KY, Campbell County, KY, Kenton County, KY, Butler County, OH, Clermont County, OH, Hamilton County, OH, Montgomery County, OH, Preble County, OH, Warren County, OH
The radar
The Indianapolis radar (KIND), 65 km from the middle of the area, began a volume at 18:06 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 12:00Z, 6.1 hours before the alert went out and 139 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
- 577 J/kg
- Mixed-layer CIN
- -123 J/kg
- Mixed-layer LCL
- 465 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 119 m²/s²
- 0-3 km storm-relative helicity
- 147 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.8
The text
As transmitted, in the capitals the NWS used until 2016.
272 ACUS11 KWNS 271808 SWOMCD SPC MCD 271807 OHZ000-KYZ000-INZ000-ILZ000-272000- MESOSCALE DISCUSSION 0941 NWS STORM PREDICTION CENTER NORMAN OK 0107 PM CDT THU MAY 27 2004 AREAS AFFECTED...CNTRL IL...S CNTRL IND...SW OH CONCERNING...SEVERE THUNDERSTORM POTENTIAL VALID 271807Z - 272000Z SEVERE THREAT APPEARS TO BE INCREASING...AND ONE OR MORE ADDITIONAL WWS LIKELY WILL BE REQUIRED SHORTLY. LOW-LEVEL CONFLUENCE AXIS/WEAK LOW-LEVEL BAROCLINIC ZONE IS READILY EVIDENT IN SATELLITE IMAGERY ACROSS CENTRAL ILLINOIS/SOUTH CENTRAL INDIANA INTO SOUTHWEST OHIO...GENERALLY NEAR/EAST OF QUINCY/ SPRINGFIELD/BLOOMINGTON AND CINCINNATI. VERY MOIST BOUNDARY LAYER WITH 70F DEW POINTS ALONG AND WEST OF THIS BOUNDARY HAS ALREADY BECOME MODERATELY UNSTABLE WITH MEAN MIXED LAYER CAPE UP TO AROUND 2000 J/KG. LITTLE OR NO CONVECTIVE INHIBITION APPEARS TO REMAIN... AND ENHANCED ISENTROPIC ASCENT ALONG THERMAL GRADIENT SHOULD SUPPORT INCREASING CONVECTIVE DEVELOPMENT WITHIN NEXT FEW HOURS. FORCING ON TAIL END OF NORTHERN BRANCH TROUGH SHIFTING EAST OF THE UPPER MISSISSIPPI VALLEY WILL AIDED EVOLUTION OF ONE OR MORE CLUSTERS OF STORMS. GIVEN MAGNITUDE OF INSTABILITY...MODERATE TO STRONG MID/UPPER WIND FIELDS AND VERTICAL SHEAR PROFILES WILL SUPPORT SEVERE STORMS WITH LARGE HAIL/DAMAGING WIND GUSTS. A FEW SUPERCELLS WILL ALSO BE POSSIBLE...WITH ASSOCIATED THREAT FOR ISOLATED TORNADOES AS ACTIVITY BECOMES ROOTED IN VERY MOIST/BUOYANT BOUNDARY LAYER. ..KERR.. 05/27/2004 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...ILN...LMK...IND...LOT...ILX... 40469030 40708913 40598793 40168661 39848521 39818420 39158373 38868420 38648563 39728996
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 26, 7:57 PM CDT | Mesoscale Discussion | SPC | Alexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 13 more | 63 min |
| May 26, 8:55 PM CDT | Tornado Watch | SPC | Edwards, Franklin, Gallatin, Hamilton, Hardin, Jackson and 16 more | 5 hr |
| May 26, 9:36 PM CDT | Mesoscale Discussion | SPC | Adams, Bond, Brown, Calhoun, Cass, Christian and 25 more | 54 min |
| May 26, 11:14 PM CDT | Mesoscale Discussion | SPC | Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 17 more | 2 hr |
| May 27, 1:53 AM CDT | Mesoscale Discussion | SPC | Christian, Clark, Clay, Coles, Crawford, Cumberland and 9 more | 3 hr |
| May 27, 11:10 AM CDT | Mesoscale Discussion | SPC | Adams, Brown, Calhoun, Cass, Christian, DeWitt and 25 more | 2 hr |
| May 27, 11:55 AM CDT | Severe Thunderstorm Watch | SPC | Adams, Brown, Hancock, Henderson, McDonough, Pike and 3 more | 6 hr |
| May 27, 1:30 PM CDT | Severe Thunderstorm Watch | SPC | Cass, Champaign, Christian, Coles, DeWitt, Douglas and 22 more | 7 hr |
| May 27, 1:52 PM CDT | Mesoscale Discussion | SPC | Adams, Calhoun, Greene, Jersey, Macoupin, Pike and 1 more | 113 min |
| May 27, 2:25 PM CDT | Severe Thunderstorm Watch | SPC | Bond, Calhoun, Clinton, Fayette, Franklin, Greene and 12 more | 7 hr |
| May 27, 3:12 PM CDT | Mesoscale Discussion | SPC | Champaign, Christian, Clark, Coles, Cumberland, DeWitt and 13 more | 2 hr |
| May 27, 3:37 PM CDT | Mesoscale Discussion | SPC | Bond, Calhoun, Clay, Clinton, Edwards, Effingham and 22 more | 113 min |
| May 27, 4:00 PM CDT | Severe Thunderstorm Watch | SPC | Clark, Clay, Crawford, Cumberland, Edwards, Effingham and 7 more | 4 hr |
| May 27, 5:01 PM CDT | Mesoscale Discussion | SPC | Bond, Calhoun, Clinton, Fayette, Greene, Jackson and 11 more | 89 min |
| May 27, 6:00 PM CDT | Mesoscale Discussion | SPC | Champaign, DeWitt, Douglas, Edgar, Macon, Morgan and 4 more | 90 min |
| May 27, 6:35 PM CDT | Mesoscale Discussion | SPC | Ohio, Switzerland | 25 min |
| May 27, 6:55 PM CDT | Tornado Watch | SPC | Jefferson, Ohio, Switzerland | 5 hr |
| May 27, 6:22 PM CDT | Mesoscale Discussion | SPC | Anderson, Bath, Bourbon, Carroll, Clark, Fayette and 16 more | 53 min |
| May 27, 4:14 PM CDT | Mesoscale Discussion | SPC | Athens, Belmont, Coshocton, Delaware, Fairfield, Franklin and 22 more | 91 min |
| May 27, 4:45 PM CDT | Severe Thunderstorm Watch | SPC | Athens, Belmont, Carroll, Coshocton, Crawford, Delaware and 30 more | 5 hr |
| May 27, 6:13 PM CDT | Mesoscale Discussion | SPC | Athens, Belmont, Coshocton, Delaware, Fairfield, Franklin and 23 more | 92 min |
Nearby
Mesoscale Discussions in Indiana, 2004Mesoscale Discussions in Illinois, 2004Mesoscale Discussions in Ohio, 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.