Alert archive / Missouri / Mesoscale Discussions in 2005
Mesoscale Discussion 607
The Storm Prediction Center issued this mesoscale discussion at Apr 20, 2005, 1:52 PM CDT for 19 counties in Illinois; 36 counties in Missouri. It was in force for 113 min.
The area
The outline as issued.
The facts
- Issued
- Apr 20, 2005, 1:52 PM CDT (18:52 UTC)
- Expired
- Apr 20, 2005, 3:45 PM CDT
- In force
- 113 min
- Issued by
- the Storm Prediction Center
All 55 counties
Adams County, IL, Brown County, IL, Calhoun County, IL, Cass County, IL, Fulton County, IL, Greene County, IL, Hancock County, IL, Jersey County, IL, Macoupin County, IL, Madison County, IL, Mason County, IL, McDonough County, IL, Menard County, IL, Monroe County, IL, Morgan County, IL, Pike County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Audrain County, MO, Boone County, MO, Callaway County, MO, Camden County, MO, City of Saint Louis, MO, Cole County, MO, Cooper County, MO, Crawford County, MO, Dallas County, MO, Dent County, MO, Franklin County, MO, Gasconade County, MO, Howard County, MO, Jefferson County, MO, Laclede County, MO, Lewis County, MO, Lincoln County, MO, Maries County, MO, Marion County, MO, Miller County, MO, Moniteau County, MO, Monroe County, MO, Montgomery County, MO, Morgan County, MO, Osage County, MO, Phelps County, MO, Pike County, MO, Pulaski County, MO, Ralls County, MO, Randolph County, MO, Saint Charles County, MO, Saint Louis County, MO, Shelby County, MO, Texas County, MO, Warren County, MO, Washington County, MO
The radar
The St Louis radar (KLSX), 83 km from the middle of the area, began a volume at 18:55 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 nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 6.9 hours before the alert went out and 264 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
- 107 J/kg
- Mixed-layer CIN
- -174 J/kg
- Mixed-layer LCL
- 1360 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 13 m²/s²
- 0-3 km storm-relative helicity
- 37 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 201852 SWOMCD SPC MCD 201852 ILZ000-MOZ000-IAZ000-202045- MESOSCALE DISCUSSION 0607 NWS STORM PREDICTION CENTER NORMAN OK 0152 PM CDT WED APR 20 2005 AREAS AFFECTED...ERN MO/WCNTRL IL CONCERNING...SEVERE THUNDERSTORM POTENTIAL VALID 201852Z - 202045Z THREAT FOR ISOLD SEVERE WIND/HAIL INCREASING ACROSS ERN MO INTO WCNTRL IL. ALTHOUGH NOT CURRENTLY ANTICIPATED...WILL CONTINUE TO MONITOR TRENDS FOR POSSIBLE WW. ORGANIZED MCS CONTINUES TO PROPAGATE SEWD AT AROUND 25 KTS ACROSS ECNTRL MO...ALONG A LINE FROM WEST OF QUINCY IL TO NEAR COLUMBIA MO. AHEAD OF THIS MCS...DOWNSTREAM AIRMASS CHARACTERIZED BY MODERATE INSTABILITY...WITH UPPER 70S/LOWER 80S TEMPS CONTRIBUTING TO 1000-1500 J/KG MLCAPE AMIDST NEGLIGIBLE CINH BASED UPON RUC PROXIMITY SOUNDINGS. IN SPITE OF RATHER WEAK VERTICAL SHEAR /DEEP LAYER SHEAR 20 KTS OR LESS/...ORGANIZATION OF MCS AND MODEST SWLY INFLOW WILL CONTINUE TO SUPPORT PROPAGATION THROUGH MODERATELY UNSTABLE AIRMASS...WITH THREAT FOR AT LEAST ISOLD DAMAGING WINDS/LARGE HAIL THROUGH THE AFTERNOON. ..GUYER.. 04/20/2005 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...ILX...LSX...DVN...SGF...EAX... 40479135 40639036 39998957 38189001 37169141 37559310 38649320 39579240
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 20, 12:21 PM CDT | Mesoscale Discussion | SPC | Champaign, Douglas, Ford, Iroquois, Piatt, Vermilion | 114 min |
| Apr 20, 5:07 PM CDT | Mesoscale Discussion | SPC | Clinton, Franklin, Jackson, Jefferson, Madison, Monroe and 5 more | 113 min |
Nearby
Mesoscale Discussions in Missouri, 2005Mesoscale Discussions in Illinois, 2005Every mesoscale discussion in 2005
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.