Alert archive / Wisconsin / Mesoscale Discussions in 2012
Mesoscale Discussion 677
The Storm Prediction Center issued this mesoscale discussion at May 3, 2012, 2:53 PM CDT for 4 states. It was in force for 67 min.
The area
The outline as issued.
The facts
- Issued
- May 3, 2012, 2:53 PM CDT (19:53 UTC)
- Expired
- May 3, 2012, 4:00 PM CDT
- In force
- 67 min
- Issued by
- the Storm Prediction Center
All 23 counties
Boone County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Kane County, IL, Lake County, IL, McHenry County, IL, Ogle County, IL, Winnebago County, IL, LaPorte County, IN, Porter County, IN, Berrien County, MI, Columbia County, WI, Dane County, WI, Dodge County, WI, Jefferson County, WI, Kenosha County, WI, Milwaukee County, WI, Racine County, WI, Rock County, WI, Walworth County, WI, Washington County, WI, Waukesha County, WI
The radar
The Milwaukee radar (KMKX), 26 km from the middle of the area, began a volume at 19:56 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
Green Bay/Straub, WI (KGRB), launched 12:00Z, 7.9 hours before the alert went out and 187 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
- 321 J/kg
- Mixed-layer CIN
- -146 J/kg
- Mixed-layer LCL
- 565 m above ground
- 0-6 km bulk shear
- 58 kt
- 0-1 km storm-relative helicity
- 160 m²/s²
- 0-3 km storm-relative helicity
- 220 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.8
The text
As transmitted, in the capitals the NWS used until 2016.
511 ACUS11 KWNS 031953 SWOMCD SPC MCD 031953 INZ000-MIZ000-ILZ000-WIZ000-032100- MESOSCALE DISCUSSION 0677 NWS STORM PREDICTION CENTER NORMAN OK 0253 PM CDT THU MAY 03 2012 AREAS AFFECTED...SRN WI...NRN IL...SRN LAKE MI CONCERNING...SEVERE THUNDERSTORM WATCH 230... VALID 031953Z - 032100Z THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 230 CONTINUES. SUMMARY...STRONG/SEVERE THUNDERSTORMS WILL PERSIST ACROSS THE NRN HALF OF WW230. DISCUSSION...TRANSITORY MCV HAS PROGRESSED ACROSS SRN WI AND HAS LOST ITS IDENTITY OVER CNTRL LAKE MI. IN THE WAKE OF THIS FEATURE STRONG/SEVERE THUNDERSTORMS TRAIL SWWD ACROSS CNTRL LAKE MI AND SRN WI. GIVEN THE DEEP SWLY FLOW ACROSS THIS REGION THERE APPEARS TO BE SOME AIR MASS RECOVERY INTO THE SWRN FLANK OF THE ONGOING CONVECTION. LATEST VIS IMAGERY SUPPORTS THIS TREND WITH NEW UPDRAFTS FORMING ACROSS SCNTRL WI. NEW TSTMS WILL LIKELY EVOLVE ACROSS SRN WI OVER THE NEXT FEW HOURS WITH SUBSEQUENT MOVEMENT EXPECTED TO TRAIL CURRENT ACTIVITY. WITH TIME NEW STORMS MAY DEVELOP INTO NRN IL AS BOUNDARY LAYER WARMS/DEEPENS. ..DARROW.. 05/03/2012 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...IWX...LOT...MKX...DVN... LAT...LON 43738952 43318654 41428652 41858952 43738952
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 3, 1:07 PM CDT | Severe Thunderstorm Watch | SPC | Boone, Cook, DeKalb, DuPage, Kane, Kendall and 5 more | 6 hr |
| May 3, 3:53 PM CDT | Mesoscale Discussion | SPC | Brown, Bureau, Cass, DeWitt, Fulton, Greene and 22 more | 37 min |
| May 3, 4:20 PM CDT | Tornado Watch | SPC | Bureau, Cass, Champaign, DeWitt, Ford, Fulton and 26 more | 8 hr |
| May 3, 6:22 PM CDT | Mesoscale Discussion | SPC | Cook, DeKalb, DuPage, Kane, Kendall, Lake and 1 more | 23 min |
| May 3, 6:41 PM CDT | Severe Thunderstorm Watch | SPC | Boone, Cook, DeKalb, DuPage, Ford, Grundy and 12 more | 5 hr |
| May 3, 6:42 PM CDT | Mesoscale Discussion | SPC | Adams, Brown, Cass, DeWitt, Fulton, Greene and 17 more | 63 min |
| May 2, 11:51 PM CDT | Mesoscale Discussion | SPC | Manistee, Mason, Oceana | 54 min |
| May 3, 10:34 AM CDT | Mesoscale Discussion | SPC | Arenac, Bay, Clare, Clinton, Genesee, Gladwin and 28 more | 86 min |
| May 3, 11:41 AM CDT | Severe Thunderstorm Watch | SPC | Alcona, Alpena, Antrim, Arenac, Bay, Benzie and 23 more | 5 hr |
| May 3, 1:35 PM CDT | Severe Thunderstorm Watch | SPC | Allegan, Barry, Berrien, Branch, Calhoun, Cass and 27 more | 8 hr |
| May 3, 1:39 PM CDT | Mesoscale Discussion | SPC | Antrim, Arenac, Bay, Benzie, Clare, Crawford and 18 more | 66 min |
| May 3, 3:33 PM CDT | Mesoscale Discussion | SPC | Allegan, Barry, Bay, Calhoun, Cass, Clinton and 15 more | 57 min |
| May 3, 5:57 PM CDT | Mesoscale Discussion | SPC | Allegan, Barry, Berrien, Branch, Calhoun, Cass and 28 more | 63 min |
| May 2, 7:38 PM CDT | Mesoscale Discussion | SPC | Adams, Buffalo, Jackson, Juneau, La Crosse, Monroe and 4 more | 37 min |
| May 2, 7:47 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Buffalo, Clark, Jackson, Juneau, La Crosse and 3 more | 5 hr |
| May 3, 8:43 AM CDT | Mesoscale Discussion | SPC | Adams, Brown, Buffalo, Calumet, Clark, Columbia and 26 more | 92 min |
Nearby
Mesoscale Discussions in Wisconsin, 2012Mesoscale Discussions in Illinois, 2012Mesoscale Discussions in Indiana, 2012Every mesoscale discussion in 2012
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.