Alert archive / Michigan / Mesoscale Discussions in 2017
Mesoscale Discussion 1007
The Storm Prediction Center issued this mesoscale discussion at Jun 13, 2017, 12:58 AM EDT for 9 counties in Michigan. It was in force for 92 min.
The area
The outline as issued.
The facts
- Issued
- Jun 13, 2017, 12:58 AM EDT (04:58 UTC)
- Expired
- Jun 13, 2017, 2:30 AM EDT
- In force
- 92 min
- Issued by
- the Storm Prediction Center
Counties Alcona County, MI, Alpena County, MI, Crawford County, MI, Gladwin County, MI, Iosco County, MI, Montmorency County, MI, Ogemaw County, MI, Oscoda County, MI, Roscommon County, MI
The radar
The NCL Michigan radar (KAPX), 72 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
Alpena, MI (KAPX), launched 00:00Z, 5.0 hours before the alert went out and 140 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
- 577 J/kg
- Mixed-layer CIN
- -128 J/kg
- Mixed-layer LCL
- 961 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 24 m²/s²
- 0-3 km storm-relative helicity
- 43 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.6
The text
As transmitted.
617
ACUS11 KWNS 130459
SWOMCD
SPC MCD 130458
MIZ000-130630-
Mesoscale Discussion 1007
NWS Storm Prediction Center Norman OK
1158 PM CDT Mon Jun 12 2017
Areas affected...Northeast Lower Michigan
Concerning...Severe Thunderstorm Watch 321...
Valid 130458Z - 130630Z
The severe weather threat for Severe Thunderstorm Watch 321
continues.
SUMMARY...The severe-weather threat continues across northeast Lower
Michigan as a band of storms advances to the east at 40 kt. The
severe-weather threat has ended across the northwest part of WW 321
as storms have moved into northeast Lower Michigan, while farther
south a more stable environment precluded storms in central parts of
Lower Michigan.
DISCUSSION...At 0445Z, mosaic radar imagery indicated a short band
of storms advancing east across northeast Lower Michigan at 40 kt,
with this activity expected to move east of the Lake Huron shore
around 06Z. These storms will move along an instability gradient
posing a continued threat for strong/damaging wind gusts.
..Peters.. 06/13/2017
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...APX...GRR...
LAT...LON 43958458 44598491 44968454 45168410 45138322 44548318
44278323 44078363 43958458SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 12, 9:09 PM EDT | Severe Thunderstorm Watch | SPC | Alcona, Antrim, Arenac, Bay, Benzie, Charlevoix and 34 more | 5 hr |
| Jun 12, 10:30 PM EDT | Mesoscale Discussion | SPC | Alcona, Arenac, Bay, Benzie, Clare, Clinton and 29 more | 90 min |
Nearby
Mesoscale 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.