Alert archive / Wisconsin / Mesoscale Discussions in 2017
Mesoscale Discussion 739
The Storm Prediction Center issued this mesoscale discussion at May 16, 2017, 6:25 PM CDT for Gogebic County, Iron County, Michigan; 38 counties in Wisconsin. It was in force for 65 min.
The area
The outline as issued.
The facts
- Issued
- May 16, 2017, 6:25 PM CDT (23:25 UTC)
- Expired
- May 16, 2017, 7:30 PM CDT
- In force
- 65 min
- Issued by
- the Storm Prediction Center
All 40 counties
Gogebic County, MI, Iron County, MI, Ashland County, WI, Barron County, WI, Bayfield County, WI, Brown County, WI, Buffalo County, WI, Burnett County, WI, Chippewa County, WI, Clark County, WI, Douglas County, WI, Dunn County, WI, Eau Claire County, WI, Florence County, WI, Forest County, WI, Iron County, WI, Jackson County, WI, Langlade County, WI, Lincoln County, WI, Marathon County, WI, Marinette County, WI, Menominee County, WI, Oconto County, WI, Oneida County, WI, Outagamie County, WI, Pepin County, WI, Pierce County, WI, Polk County, WI, Portage County, WI, Price County, WI, Rusk County, WI, Saint Croix County, WI, Sawyer County, WI, Shawano County, WI, Taylor County, WI, Trempealeau County, WI, Vilas County, WI, Washburn County, WI, Waupaca County, WI, Wood County, WI
The radar
The La Crosse radar (KARX), 192 km from the middle of the area, began a volume at 23:26 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, 11.4 hours before the alert went out and 220 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
- 1146 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 73 m²/s²
- 0-3 km storm-relative helicity
- 7 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
336
ACUS11 KWNS 162326
SWOMCD
SPC MCD 162325
MIZ000-WIZ000-MNZ000-170030-
Mesoscale Discussion 0739
NWS Storm Prediction Center Norman OK
0625 PM CDT Tue May 16 2017
Areas affected...Northern/central Wisconsin and the southern Upper
Peninsula of Michigan
Concerning...Tornado Watch 222...
Valid 162325Z - 170030Z
The severe weather threat for Tornado Watch 222 continues.
SUMMARY...A considerable tornado threat continues across the
discussion area, including significant tornado potential with a cell
currently over Rusk County, WI.
DISCUSSION...A cluster of intense thunderstorms with a history of
strong rotation, significant hail, and tornadoes, has evolved over
the past couple of hours in northwestern and north-central
Wisconsin. Additional activity has matured west of this cluster
from near DLH southward to about 25 SSE of MSP. These storms are
moving into a favorable environment for continued significant severe
potential (including tornadoes) over the next 1-2 hours, where
recent objective analyses indicate 2000+ J/kg MUCAPE and 300-400
m2/s2 effective SRH downstream of this complex of storms within an
undisturbed preconvective airmass. Based on the evolving severe
threat, a new tornado watch and/or spatial extensions to the
existing watch may be needed around/just after 00Z.
..Cook/Guyer.. 05/16/2017
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...MQT...GRB...DLH...ARX...MPX...
LAT...LON 46609217 46759166 46779084 46649039 46448942 46278850
45948790 45528764 44888766 44478796 44298869 44298990
44209082 44239168 44439225 44619254 44949278 45739264
46089252 46609217SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 15, 7:19 PM CDT | Mesoscale Discussion | SPC | Crawford, Dane, Grant, Green, Iowa, Lafayette and 4 more | 56 min |
| May 15, 7:52 PM CDT | Severe Thunderstorm Watch | SPC | Dane, Green, Iowa, Jefferson, Kenosha, Lafayette and 3 more | 3 hr |
| May 15, 9:48 PM CDT | Severe Thunderstorm Watch | SPC | Buffalo, Crawford, Jackson, La Crosse, Monroe, Pepin and 4 more | 5 hr |
| May 15, 10:14 PM CDT | Mesoscale Discussion | SPC | Jefferson, Kenosha, Rock, Walworth, Waukesha | 61 min |
| May 16, 2:13 AM CDT | Mesoscale Discussion | SPC | Buffalo, La Crosse, Trempealeau | 92 min |
| May 16, 12:57 PM CDT | Mesoscale Discussion | SPC | Buffalo, Clark, Eau Claire, Jackson, Marathon, Menominee and 7 more | 2 hr |
| May 16, 3:32 PM CDT | Mesoscale Discussion | SPC | Adams, Barron, Buffalo, Burnett, Calumet, Chippewa and 33 more | 88 min |
| May 16, 4:02 PM CDT | Tornado Watch | SPC | Ashland, Barron, Bayfield, Buffalo, Burnett, Chippewa and 24 more | 6 hr |
Nearby
Mesoscale Discussions in Wisconsin, 2017Mesoscale Discussions in Michigan, 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.