Alert archive / Michigan / Mesoscale Discussions in 2012
Mesoscale Discussion 1595
The Storm Prediction Center issued this mesoscale discussion at Jul 26, 2012, 12:09 AM EDT for 32 counties in Michigan; Ozaukee County, Sheboygan County, Wisconsin. It was in force for 96 min.
The area
The outline as issued.
The facts
- Issued
- Jul 26, 2012, 12:09 AM EDT (04:09 UTC)
- Expired
- Jul 26, 2012, 1:45 AM EDT
- In force
- 96 min
- Issued by
- the Storm Prediction Center
All 34 counties
Arenac County, MI, Bay County, MI, Clare County, MI, Clinton County, MI, Genesee County, MI, Gladwin County, MI, Gratiot County, MI, Huron County, MI, Ionia County, MI, Isabella County, MI, Kent County, MI, Lake County, MI, Lapeer County, MI, Macomb County, MI, Manistee County, MI, Mason County, MI, Mecosta County, MI, Midland County, MI, Missaukee County, MI, Montcalm County, MI, Muskegon County, MI, Newaygo County, MI, Oakland County, MI, Oceana County, MI, Osceola County, MI, Ottawa County, MI, Saginaw County, MI, Saint Clair County, MI, Sanilac County, MI, Shiawassee County, MI, Tuscola County, MI, Wexford County, MI, Ozaukee County, WI, Sheboygan County, WI
The radar
The Grand Rapids radar (KGRR), 109 km from the middle of the area, began a volume at 04:12 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
Detroit, MI (KDTX), launched 00:00Z, 4.2 hours before the alert went out and 159 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
- 1843 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- 226 m²/s²
- 0-3 km storm-relative helicity
- 373 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.4
The text
As transmitted, in the capitals the NWS used until 2016.
134
ACUS11 KWNS 260409
SWOMCD
SPC MCD 260409
MIZ000-WIZ000-260545-
MESOSCALE DISCUSSION 1595
NWS STORM PREDICTION CENTER NORMAN OK
1109 PM CDT WED JUL 25 2012
AREAS AFFECTED...SOUTHERN WI/LOWER MI
CONCERNING...SEVERE THUNDERSTORM WATCH 520...522...
VALID 260409Z - 260545Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH
520...522...CONTINUES.
SUMMARY...SEVERE TSTM WATCHES 520/522 CONTINUE UNTIL 07Z/09Z
RESPECTIVELY. POTENTIAL REMAINS FOR DAMAGING WINDS ESPECIALLY ACROSS
CENTRAL/EASTERN LOWER MI AS WELL AS FAR SOUTHERN WI...WITH LOCALLY
HEAVY/REPETITIVE RAINFALL ALSO A CONCERN.
DISCUSSION...SURFACE COLD POOL CONTINUES TO BE REINFORCED BY
EXTENSIVE PRECIPITATION ACROSS NORTH-CENTRAL MI IN VICINITY OF
EFFECTIVE FRONTAL ZONE...WITH AN ACCELERATING LINE SEGMENT /40-45
KT/ ACROSS CENTRAL MI AS OF 0345Z. CELL MERGERS SHOULD CONTINUE TO
ALLOW FOR ADDITIONAL UPSCALE GROWTH AND A DEGREE OF STORM-SCALE
BOWING/ADDITIONAL QLCS ACCELERATION OVER THE NEXT HOUR OR TWO. WITH
MODERATE MID-LEVEL WESTERLIES SAMPLED BY EARLIER 00Z OBSERVED
SOUNDINGS FROM GRB/APX/DTX...MORE CONTEMPORARY REGIONAL WSR-88D
OBSERVATIONS ARE INDICATIVE OF A FURTHER INCREASE IN LOW-LEVEL WIND
SPEEDS THIS EVENING...WITH AS MUCH AS 50 KT SWLY WINDS EVIDENT IN
THE LOWEST 1-2 KM PER THE DETROIT WSR-88D VWP. THUS...EVEN WITH A
SOMEWHAT NOCTURNALLY INHIBITED BOUNDARY LAYER....EXISTING/INCREASING
QUASI-LINEAR ORGANIZATION...ALONG WITH THE DEGREE OF MEAN
FLOW...SUGGESTS THAT A SEVERE WIND THREAT WILL CONTINUE/POTENTIALLY
INCREASE FROM CENTRAL LOWER MI TO THE THUMB REGION/PARTS OF
SOUTHEAST LOWER MI.
..GUYER.. 07/26/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...DTX...APX...GRR...GRB...MKX...
LAT...LON 43988849 44268638 44398498 44088364 44358246 44148186
43518187 42548246 42788496 42988757 43988849SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 25, 9:28 PM EDT | Mesoscale Discussion | SPC | Arenac, Bay, Clare, Clinton, Eaton, Genesee and 34 more | 92 min |
| Jul 25, 9:47 PM EDT | Severe Thunderstorm Watch | SPC | Bay, Genesee, Huron, Lapeer, Livingston, Macomb and 9 more | 6 hr |
| Jul 26, 2:40 AM EDT | Mesoscale Discussion | SPC | Allegan, Barry, Bay, Berrien, Branch, Calhoun and 41 more | 65 min |
| Jul 25, 8:20 PM EDT | Mesoscale Discussion | SPC | La Crosse | 85 min |
| Jul 25, 9:40 PM EDT | Mesoscale Discussion | SPC | Lafayette | 65 min |
| Jul 26, 12:34 AM EDT | Mesoscale Discussion | SPC | Columbia, Dane, Dodge, Fond du Lac, Green, Iowa and 11 more | 86 min |
| Jul 26, 1:09 PM EDT | Mesoscale Discussion | SPC | Adams, Brown, Calumet, Columbia, Dane, Dodge and 27 more | 2 hr |
Nearby
Mesoscale Discussions in Michigan, 2012Mesoscale Discussions in Wisconsin, 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.