Alert archive / Illinois / Mesoscale Discussions in 2003
Mesoscale Discussion 977
The Storm Prediction Center issued this mesoscale discussion at May 14, 2003, 2:45 PM CDT for 38 counties in Illinois. It was in force for 60 min.
The area
The outline as issued.
The facts
- Issued
- May 14, 2003, 2:45 PM CDT (19:45 UTC)
- Expired
- May 14, 2003, 3:45 PM CDT
- In force
- 60 min
- Issued by
- the Storm Prediction Center
All 38 counties
Bureau County, IL, Cass County, IL, Champaign County, IL, Christian County, IL, Coles County, IL, DeWitt County, IL, Douglas County, IL, Edgar County, IL, Ford County, IL, Fulton County, IL, Grundy County, IL, Henry County, IL, Iroquois County, IL, Kankakee County, IL, Knox County, IL, LaSalle County, IL, Livingston County, IL, Logan County, IL, Macon County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, McLean County, IL, Menard County, IL, Morgan County, IL, Moultrie County, IL, Peoria County, IL, Piatt County, IL, Putnam County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Stark County, IL, Tazewell County, IL, Vermilion County, IL, Warren County, IL, Will County, IL, Woodford County, IL
The radar
The Lincoln radar (KILX), 29 km from the middle of the area, began a volume at 19:49 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, 7.8 hours before the alert went out and 77 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1154 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 44 m²/s²
- 0-3 km storm-relative helicity
- 132 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 ACUS11 KWNS 141946 SWOMCD SPC MCD 141945 INZ000-ILZ000-IAZ000-142045- MESOSCALE DISCUSSION 0977 NWS STORM PREDICTION CENTER NORMAN OK 0245 PM CDT WED MAY 14 2003 AREAS AFFECTED...NCNTRL/NRN IL CONCERNING...SEVERE THUNDERSTORM WATCH 369... VALID 141945Z - 142045Z SCATTERED TSTM ACTIVITY CONTINUES IN THE NWRN PORTION OF WW #369. EXPECT SOME ADDITIONAL DEVELOPMENT OVER THE NEXT HOUR OR SO IN THE WRN PORTION OF THE WW. RECENT VISIBLE/RADAR IMAGERY INDICATES RAPIDLY DEVELOPING LINE OF TOWERING CUMULUS FROM BETWEEN PEORIA AND GALESBURG SWWD TO NEAR PITTSFIELD IL IN AN AREA OF BETTER LOW-LVL CONVERGENCE JUST AHEAD OF BOUNDARY IN EXTREME ERN IA. LARGE HAIL IS LIKELY WITH THESE DEVELOPING STORMS AND POSSIBLY A DAMAGING WIND THREAT AS A LINEAR FORMATION APPEARS LIKELY. THE AIRMASS IN THIS AREA CONTINUES TO DESTABILIZE AS SURFACE TEMPERATURES HAVE RISEN INTO THE LOW 70S WITH DEWPOINTS INTO THE UPPER 50S/LOW 60S...YIELDING 100MB MIXED CAPES BETWEEN 500-1000 J/KG. 0-6KM DEEP LAYER SHEAR VALUES BETWEEN 40-45 KTS AND THE IMPINGEMENT OF STRONGER /60-65 KT/ MID-LVL FLOW TO THE SSE OF THE MID-LVL CYCLONE INDICATE STORM ORGANIZATION IS LIKELY. ..NADEN.. 05/14/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...LOT...ILX...LSX...DVN... 39378985 39669069 40669073 41569055 41598880 41478743 39478766
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 14, 12:36 PM CDT | Mesoscale Discussion | SPC | Adams, Brown, Bureau, Cass, Champaign, Christian and 38 more | 84 min |
| May 14, 1:10 PM CDT | Severe Thunderstorm Watch | SPC | Brown, Bureau, Cass, Champaign, DeWitt, Douglas and 33 more | 6 hr |
| May 14, 2:00 PM CDT | Severe Thunderstorm Watch | SPC | Henderson, Mercer | 5 hr |
| May 14, 3:23 PM CDT | Mesoscale Discussion | SPC | Hancock, Henderson | 97 min |
| May 14, 5:07 PM CDT | Mesoscale Discussion | SPC | Brown, Bureau, Cass, Champaign, DeWitt, Douglas and 28 more | 113 min |
| May 14, 6:45 PM CDT | Severe Thunderstorm Watch | SPC | Bond, Brown, Calhoun, Cass, Champaign, Christian and 35 more | 5 hr |
Nearby
Mesoscale Discussions in Illinois, 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.