Alert archive / Wisconsin / Mesoscale Discussions in 2017
Mesoscale Discussion 992
The Storm Prediction Center issued this mesoscale discussion at Jun 12, 2017, 12:59 AM EDT for Delta County, Menominee County, Michigan; 9 counties in Wisconsin. It was in force for 91 min.
The area
The outline as issued.
The facts
- Issued
- Jun 12, 2017, 12:59 AM EDT (04:59 UTC)
- Expired
- Jun 12, 2017, 2:30 AM EDT
- In force
- 91 min
- Issued by
- the Storm Prediction Center
Counties Delta County, MI, Menominee County, MI, Door County, WI, Florence County, WI, Forest County, WI, Langlade County, WI, Marathon County, WI, Marinette County, WI, Menominee County, WI, Oconto County, WI, Shawano County, WI
The radar
The Green Bay radar (KGRB), 83 km from the middle of the area, began a volume at 05:01 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
Green Bay/Straub, WI (KGRB), launched 00:00Z, 5.0 hours before the alert went out and 85 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
- 428 J/kg
- Mixed-layer CIN
- -274 J/kg
- Mixed-layer LCL
- 1257 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 288 m²/s²
- 0-3 km storm-relative helicity
- 452 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.0
The text
As transmitted.
566
ACUS11 KWNS 120459
SWOMCD
SPC MCD 120459
MIZ000-WIZ000-120630-
Mesoscale Discussion 0992
NWS Storm Prediction Center Norman OK
1159 PM CDT Sun Jun 11 2017
Areas affected...North-central and northeast WI into southern Upper
MI
Concerning...Severe Thunderstorm Watch 315...
Valid 120459Z - 120630Z
The severe weather threat for Severe Thunderstorm Watch 315
continues.
SUMMARY...Hail cannot be ruled out with any of the remaining
stronger storms across the north-central and northeast WI into
south-central Upper MI portions of WW 315. However, recent trends
in radar imagery suggest the overall severe-weather threat should
diminish overnight and this watch could be canceled prior to the 08Z
expiration.
DISCUSSION...Radar imagery and surface observations showed an
outflow boundary, attendant to storms that are now moving eastward
through far northern Lake Michigan, extended southwest through
southern Door County to northern Waupaca County to southern Marathon
County. A veered/southwesterly 40-45 kt low-level jet extending
into north-central and northeast WI overnight will maintain a
warm-air advection regime to support additional thunderstorms, given
the presence of moderate elevated instability. Given most of the
storms are elevated north of the convective outflow boundary and
surface-based inhibition has strengthened through the evening, the
damaging-wind threat is greatly reduced, while hail could still
occur with any remaining stronger updrafts. However, this latter
potential is also diminishing as indicated by recent weakening
trends in MRMS MESH data.
..Peters.. 06/12/2017
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...MQT...GRB...ARX...
LAT...LON 44649048 45588928 45938840 45878734 45798663 45338671
44658740 44608831 44649048SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 11, 9:01 PM EDT | Severe Thunderstorm Watch | SPC | Delta, Dickinson, Menominee | 6 hr |
| Jun 11, 10:39 PM EDT | Mesoscale Discussion | SPC | Delta, Dickinson, Menominee | 2 hr |
| Jun 12, 6:48 PM EDT | Mesoscale Discussion | SPC | Clare, Lake, Manistee, Mason, Missaukee, Osceola and 2 more | 2 hr |
| Jun 12, 12:28 PM EDT | Mesoscale Discussion | SPC | Crawford, La Crosse, Vernon | 92 min |
| Jun 12, 12:47 PM EDT | Severe Thunderstorm Watch | SPC | Adams, Buffalo, Crawford, Grant, Jackson, Juneau and 5 more | 7 hr |
| Jun 12, 3:22 PM EDT | Mesoscale Discussion | SPC | Buffalo, Crawford, Jackson, La Crosse, Monroe, Trempealeau and 1 more | 113 min |
| Jun 12, 5:37 PM EDT | Severe Thunderstorm Watch | SPC | Brown, Calumet, Columbia, Dane, Dodge, Door and 29 more | 5 hr |
| Jun 12, 7:38 PM EDT | Mesoscale Discussion | SPC | Brown, Calumet, Columbia, Dane, Dodge, Fond du Lac and 24 more | 2 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.