Alert archive / Illinois / Mesoscale Discussions in 2004
Mesoscale Discussion 908
The Storm Prediction Center issued this mesoscale discussion at May 26, 2004, 8:20 AM CDT for 37 counties in Illinois; 28 counties in Indiana; 16 counties in Missouri. It was in force for 85 min.
The area
The outline as issued.
The facts
- Issued
- May 26, 2004, 8:20 AM CDT (13:20 UTC)
- Expired
- May 26, 2004, 9:45 AM CDT
- In force
- 85 min
- Issued by
- the Storm Prediction Center
All 81 counties
Bond County, IL, Calhoun County, IL, Christian County, IL, Clark County, IL, Clay County, IL, Clinton County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, Edwards County, IL, Effingham County, IL, Fayette County, IL, Franklin County, IL, Gallatin County, IL, Greene County, IL, Hamilton County, IL, Jackson County, IL, Jasper County, IL, Jefferson County, IL, Jersey County, IL, Lawrence County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Monroe County, IL, Montgomery County, IL, Perry County, IL, Randolph County, IL, Richland County, IL, Saint Clair County, IL, Saline County, IL, Shelby County, IL, Wabash County, IL, Washington County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Bartholomew County, IN, Brown County, IN, Clark County, IN, Clay County, IN, Crawford County, IN, Daviess County, IN, Dubois County, IN, Floyd County, IN, Gibson County, IN, Greene County, IN, Harrison County, IN, Jackson County, IN, Knox County, IN, Lawrence County, IN, Martin County, IN, Monroe County, IN, Orange County, IN, Owen County, IN, Perry County, IN, Pike County, IN, Posey County, IN, Scott County, IN, Spencer County, IN, Sullivan County, IN, Vanderburgh County, IN, Vigo County, IN, Warrick County, IN, Washington County, IN, City of Saint Louis, MO, Crawford County, MO, Franklin County, MO, Gasconade County, MO, Iron County, MO, Jefferson County, MO, Lincoln County, MO, Madison County, MO, Perry County, MO, Reynolds County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Warren County, MO, Washington County, MO
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, 1.3 hours before the alert went out and 180 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
- 1078 m above ground
- 0-6 km bulk shear
- 58 kt
- 0-1 km storm-relative helicity
- -20 m²/s²
- 0-3 km storm-relative helicity
- 43 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
372 ACUS11 KWNS 261321 SWOMCD SPC MCD 261320 KYZ000-INZ000-ILZ000-MOZ000-261445- MESOSCALE DISCUSSION 0908 NWS STORM PREDICTION CENTER NORMAN OK 0820 AM CDT WED MAY 26 2004 AREAS AFFECTED...E-CNTRL/SERN MO INTO SRN IL CONCERNING...SEVERE THUNDERSTORM POTENTIAL VALID 261320Z - 261445Z STRONGEST STORMS WILL BE CAPABLE OF LARGE HAIL AND CONVECTIVE TRENDS ARE BEING MONITORED FOR POSSIBLE WW ISSUANCE. GRADUAL INCREASE IN ELEVATED STORM COVERAGE/INTENSITY HAS OCCURRED OVER THE PAST HOUR FROM PIKE/LINCOLN COUNTIES IN E-CNTRL MO SWWD INTO MILLER/CAMDEN COUNTIES. 12Z SGF SOUNDING INDICATES THAT STEEP MID-LEVEL LAPSE RATES OF 7.5-8.5 C/KM ARE CONTRIBUTING TO A MODERATELY UNSTABLE AIRMASS FOR ELEVATED PARCELS WITH MUCAPES AROUND 1500 J/KG. WATER VAPOR IMAGERY SUGGESTS THAT A LOW-AMPLITUDE SHORTWAVE TROUGH AND ASSOCIATED 60-65KT MID-LEVEL JET MAX IS PROVIDING BACKGROUND LARGE-SCALE ASCENT FOR EVOLVING STORMS. POTENTIAL FOR LARGE HAIL WILL SPREAD EWD ACROSS PORTIONS OF SRN IL/SWRN IND OVER THE NEXT FEW HOURS. ADDITIONALLY...STORMS MAY TEND TO BECOME MORE SURFACE-BASED OVER THE COURSE OF THE MORNING...AND GIVEN THE FAST SYSTEM MOVEMENT...DAMAGING WINDS WILL BECOME INCREASINGLY LIKELY. THUS...A WW MAY BE REQUIRED. ..MEAD.. 05/26/2004 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...LMK...IND...PAH...ILX...LSX...SGF... 38369167 39289075 39578991 39628802 39278582 38378566 38048618 37508970 37309121
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 25, 7:28 PM CDT | Mesoscale Discussion | SPC | Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 17 more | 92 min |
| May 26, 8:50 AM CDT | Severe Thunderstorm Watch | SPC | Bond, Clay, Clinton, Crawford, Edwards, Effingham and 25 more | 5 hr |
| May 26, 10:50 AM CDT | Mesoscale Discussion | SPC | Alexander, Bond, Clay, Clinton, Crawford, Edwards and 28 more | 85 min |
| May 26, 1:10 PM CDT | Tornado Watch | SPC | Alexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 12 more | 8 hr |
| May 26, 3:32 PM CDT | Mesoscale Discussion | SPC | Alexander, Edwards, Franklin, Gallatin, Hamilton, Jackson and 13 more | 88 min |
| May 26, 5:10 PM CDT | Mesoscale Discussion | SPC | Adams, Bond, Brown, Calhoun, Cass, Christian and 29 more | 65 min |
| May 26, 5:35 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Bond, Brown, Calhoun, Cass, Christian and 34 more | 5 hr |
| May 26, 5:57 PM CDT | Mesoscale Discussion | SPC | Alexander, Franklin, Hamilton, Jackson, Jefferson, Johnson and 10 more | 93 min |
| May 26, 11:25 AM CDT | Severe Thunderstorm Watch | SPC | Clark, Crawford, Floyd, Harrison, Jefferson, Ohio and 3 more | 7 hr |
| May 26, 1:18 PM CDT | Mesoscale Discussion | SPC | Clark, Crawford, Floyd, Harrison, Jefferson, Ohio and 3 more | 87 min |
Nearby
Mesoscale Discussions in Illinois, 2004Mesoscale Discussions in Indiana, 2004Mesoscale Discussions in Missouri, 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.