Alert archive / Wisconsin / Mesoscale Discussions in 2017
Mesoscale Discussion 313
The Storm Prediction Center issued this mesoscale discussion at Mar 23, 2017, 6:28 PM CDT for 4 states. It was in force for 92 min.
The area
The outline as issued.
The facts
- Issued
- Mar 23, 2017, 6:28 PM CDT (23:28 UTC)
- Expired
- Mar 23, 2017, 8:00 PM CDT
- In force
- 92 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 5%
All 38 counties
Allamakee County, IA, Boone County, IL, Carroll County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Jo Daviess County, IL, Kane County, IL, Lake County, IL, McHenry County, IL, Ogle County, IL, Stephenson County, IL, Winnebago County, IL, Houston County, MN, Columbia County, WI, Crawford County, WI, Dane County, WI, Dodge County, WI, Fond du Lac County, WI, Grant County, WI, Green County, WI, Green Lake County, WI, Iowa County, WI, Jefferson County, WI, Juneau County, WI, Kenosha County, WI, Lafayette County, WI, Marquette County, WI, Milwaukee County, WI, Ozaukee County, WI, Racine County, WI, Richland County, WI, Rock County, WI, Sauk County, WI, Vernon County, WI, Walworth County, WI, Washington County, WI, Waukesha County, WI
The radar
The Milwaukee radar (KMKX), 46 km from the middle of the area, began a volume at 23:31 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 12:00Z, 11.5 hours before the alert went out and 173 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
- 1792 m above ground
- 0-6 km bulk shear
- 54 kt
- 0-1 km storm-relative helicity
- 190 m²/s²
- 0-3 km storm-relative helicity
- 259 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
686
ACUS11 KWNS 232328
SWOMCD
SPC MCD 232328
ILZ000-WIZ000-IAZ000-MNZ000-240100-
Mesoscale Discussion 0313
NWS Storm Prediction Center Norman OK
0628 PM CDT Thu Mar 23 2017
Areas affected...Southeast Wisconsin and Northern Illinois
Concerning...Severe potential...Watch unlikely
Valid 232328Z - 240100Z
Probability of Watch Issuance...5 percent
SUMMARY...Thunderstorms will continue this evening. isolated large
hail will be the primary threat.
DISCUSSION...Elevated thunderstorms are developing across the upper
Midwest on the nose of the 850-millibar moist, warm-air advection.
These thunderstorms are on the eastern edge of the steeper mid-level
lapse rates (between 7-8 C/km) and will continue to move generally
eastward toward a more stable environment over/near Lake Michigan.
Until then, over the next 1-2 hours, isolated large hail will be
possible with the strongest thunderstorm cores. Given the limited
spatio-temporal nature of the remaining threat, a watch is currently
not anticipated.
..Marsh/Thompson.. 03/23/2017
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...GRB...LOT...MKX...DVN...ARX...
LAT...LON 42159051 43309177 43899169 43968917 43738775 43178717
42588708 42138720 41908752 41818835 41898939 42159051SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 23, 10:16 AM CDT | Mesoscale Discussion | SPC | Buena Vista, Cherokee, Clay, Dickinson, Emmet, Ida and 9 more | 89 min |
Nearby
Mesoscale Discussions in Wisconsin, 2017Mesoscale Discussions in Illinois, 2017Mesoscale Discussions in Iowa, 2017Every mesoscale discussion in 2017
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.