Alert archive / Iowa / Mesoscale Discussions in 2006
Mesoscale Discussion 521
The Storm Prediction Center issued this mesoscale discussion at Apr 15, 2006, 10:46 PM CDT for 5 counties in Illinois; 36 counties in Iowa; 7 counties in Missouri. It was in force for 119 min.
The area
The outline as issued.
The facts
- Issued
- Apr 15, 2006, 10:46 PM CDT (03:46 UTC)
- Expired
- Apr 16, 2006, 12:45 AM CDT
- In force
- 119 min
- Issued by
- the Storm Prediction Center
All 48 counties
Benton County, IA, Black Hawk County, IA, Bremer County, IA, Buchanan County, IA, Butler County, IA, Cedar County, IA, Chickasaw County, IA, Clayton County, IA, Clinton County, IA, Davis County, IA, Delaware County, IA, Des Moines County, IA, Dubuque County, IA, Fayette County, IA, Floyd County, IA, Franklin County, IA, Grundy County, IA, Henry County, IA, Iowa County, IA, Jackson County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Lee County, IA, Linn County, IA, Louisa County, IA, Mahaska County, IA, Marshall County, IA, Muscatine County, IA, Poweshiek County, IA, Scott County, IA, Tama County, IA, Van Buren County, IA, Wapello County, IA, Washington County, IA, Hancock County, IL, Henderson County, IL, Mercer County, IL, Rock Island County, IL, Warren County, IL, Clark County, MO, Knox County, MO, Lewis County, MO, Marion County, MO, Monroe County, MO, Scotland County, MO, Shelby County, MO
The radar
The Quad Cities radar (KDVN), 136 km from the middle of the area, began a volume at 03:46 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
Davenport, (KDVN), launched 00:00Z, 3.8 hours before the alert went out and 143 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
- 2772 m above ground
- 0-6 km bulk shear
- 58 kt
- 0-1 km storm-relative helicity
- 190 m²/s²
- 0-3 km storm-relative helicity
- 191 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 160346 SWOMCD SPC MCD 160346 ILZ000-IAZ000-WIZ000-MOZ000-160545- MESOSCALE DISCUSSION 0521 NWS STORM PREDICTION CENTER NORMAN OK 1046 PM CDT SAT APR 15 2006 AREAS AFFECTED...PORTIONS E-CENTRAL/SERN IA...NERN MO...EXTREME NWRN IL. CONCERNING...SEVERE THUNDERSTORM POTENTIAL VALID 160346Z - 160545Z BAND OF STRONG-SEVERE TSTMS NOW OVER ERN-MOST PORTIONS WW 192 IS EXPECTED TO LIFT NEWD TO AREA BETWEEN CID-UIN THROUGH APPROXIMATELY 7Z. MAIN SEVERE POTENTIAL WILL TRANSITION TO HAIL...WITH OCCASIONAL STRONG-SEVERE GUSTS ALSO POSSIBLE PARTICULARLY OVER MO. AREA WILL BE MONITORED FOR POSSIBLE WW. VERTICAL SHEAR PROFILES ARE STRENGTHENING WITH TIME ACROSS THIS AREA AS MID/UPPER LEVEL SPEED MAX APCHS...ASSOCIATED WITH NEARLY VERTICALLY STACKED LOW OVER ERN NEB. HOWEVER...GIVEN DECELERATION OF THAT CYCLONE AND FCST MOTION OF MAIN BAND OF LOW LEVEL CONVECTIVE FORCING...PRIND ACTIVITY WILL OUTRUN EWD SPREAD OF OPTIMAL DEEP-LAYER SHEAR AS WELL. INFLOW PARCELS ARE FCST TO BECOME MORE ELEVATED OFF SFC WITH TIME AND WITH NWD EXTENT...GIVEN COMBINATION OF DIABATIC SFC COOLING AND PRECIP COOLING OVER IA. PARCELS MAY REMAIN NEARLY SFC-BASED FOR ANOTHER FEW HOURS ACROSS PORTIONS NERN MO...WHERE BOTH MUCAPE AND SEVERE POTENTIAL SHOULD BE MAXIMIZED. EFFECTIVE SHEARS 35-50 KT ARE EVIDENT IN RUC FCST SOUNDINGS BOTH FOR CONVECTION ROOTED IN 800-900 MB LAYER OVER IA...AND ANYWHERE BETWEEN SFC-850 MB ACROSS NERN MO. MUCAPES 1000-1500 J/KG ARE EXPECTED. ..EDWARDS.. 04/16/2006 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...ILX...LSX...DVN...ARX...DMX...EAX... 39289238 39849236 40049231 40539233 40749256 41079272 41529289 42019304 42869341 43339222 43239153 42539058 41929022 40909043 40489075 39419178 39249222
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 15, 11:39 PM CDT | Mesoscale Discussion | SPC | Adams, Pike | 66 min |
| Apr 16, 7:15 AM CDT | Mesoscale Discussion | SPC | Gallatin, Hardin, Johnson, Massac, Pope, Saline | 2 hr |
| Apr 16, 10:57 AM CDT | Mesoscale Discussion | SPC | Adams, Boone, Brown, Bureau, Calhoun, Carroll and 33 more | 2 hr |
| Apr 16, 11:17 AM CDT | Tornado Watch | SPC | Adams, Bond, Brown, Bureau, Calhoun, Cass and 44 more | 8 hr |
| Apr 16, 12:20 PM CDT | Severe Thunderstorm Watch | SPC | Boone, Carroll, Cook, DeKalb, DuPage, Ford and 15 more | 7 hr |
| Apr 16, 1:08 PM CDT | Mesoscale Discussion | SPC | Champaign, Clark, Crawford, Douglas, Edgar, Ford and 3 more | 97 min |
| Apr 16, 1:18 PM CDT | Mesoscale Discussion | SPC | Adams, Bond, Brown, Bureau, Calhoun, Cass and 45 more | 57 min |
| Apr 16, 1:39 PM CDT | Tornado Watch | SPC | Champaign, Clark, Coles, Crawford, Cumberland, Douglas and 11 more | 7 hr |
| Apr 16, 3:24 PM CDT | Mesoscale Discussion | SPC | Alexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 13 more | 2 hr |
| Apr 16, 3:43 PM CDT | Mesoscale Discussion | SPC | Bond, Bureau, Cass, Champaign, Christian, Clark and 49 more | 92 min |
| Apr 16, 3:50 PM CDT | Mesoscale Discussion | SPC | Boone, Cook, DeKalb, DuPage, Kane, Kendall and 6 more | 85 min |
| Apr 16, 6:14 PM CDT | Mesoscale Discussion | SPC | Champaign, Clark, Clay, Coles, Crawford, Cumberland and 19 more | 2 hr |
| Apr 15, 9:14 PM CDT | Mesoscale Discussion | SPC | Appanoose, Boone, Clarke, Dallas, Decatur, Greene and 10 more | 91 min |
Nearby
Mesoscale Discussions in Iowa, 2006Mesoscale Discussions in Missouri, 2006Mesoscale Discussions in Illinois, 2006Every mesoscale discussion in 2006
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.