Alert archive / Michigan / Mesoscale Discussions in 2012
Mesoscale Discussion 675
The Storm Prediction Center issued this mesoscale discussion at May 3, 2012, 2:39 PM EDT for 24 counties in Michigan. It was in force for 66 min.
The area
The outline as issued.
The facts
- Issued
- May 3, 2012, 2:39 PM EDT (18:39 UTC)
- Expired
- May 3, 2012, 3:45 PM EDT
- In force
- 66 min
- Issued by
- the Storm Prediction Center
All 24 counties
Antrim County, MI, Arenac County, MI, Bay County, MI, Benzie County, MI, Clare County, MI, Crawford County, MI, Gladwin County, MI, Grand Traverse County, MI, Isabella County, MI, Kalkaska County, MI, Lake County, MI, Leelanau County, MI, Manistee County, MI, Mecosta County, MI, Midland County, MI, Missaukee County, MI, Montmorency County, MI, Newaygo County, MI, Ogemaw County, MI, Osceola County, MI, Oscoda County, MI, Otsego County, MI, Roscommon County, MI, Wexford County, MI
The radar
The NCL Michigan radar (KAPX), 59 km from the middle of the area, began a volume at 18:40 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 12:00Z, 6.7 hours before the alert went out and 226 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
- 321 J/kg
- Mixed-layer CIN
- -146 J/kg
- Mixed-layer LCL
- 565 m above ground
- 0-6 km bulk shear
- 58 kt
- 0-1 km storm-relative helicity
- 160 m²/s²
- 0-3 km storm-relative helicity
- 220 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.8
The text
As transmitted, in the capitals the NWS used until 2016.
583 ACUS11 KWNS 031839 SWOMCD SPC MCD 031839 MIZ000-031945- MESOSCALE DISCUSSION 0675 NWS STORM PREDICTION CENTER NORMAN OK 0139 PM CDT THU MAY 03 2012 AREAS AFFECTED...NRN LOWER MI CONCERNING...SEVERE THUNDERSTORM WATCH 229... VALID 031839Z - 031945Z THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 229 CONTINUES. SUMMARY...STRONG THUNDERSTORMS WILL CONTINUE PRIMARILY ACROSS THE SERN HALF OF WW229 OVER THE NEXT FEW HOURS. DISCUSSION...LEADING EDGE OF LARGER MCS IS PROGRESSING ACROSS NRN LOWER MI AT ROUGHLY 45KT. WHILE THE INTENSITY OF THIS LEADING EDGE HAS WANED SOME OVER THE LAST HOUR STRONG STORMS ARE BECOMING ORIENTED IN A NE-SW FASHION TRAILING FROM MISSAUKEE COUNTY ACROSS CNTRL PORTIONS OF LAKE MI. WITH TIME THIS DEVELOPING BAND OF STRONG STORMS SHOULD SAG SEWD AT 15-20KT ACROSS THE REMAINDER OF WW229. ..DARROW.. 05/03/2012 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...DTX...APX...GRR... LAT...LON 45238637 45218357 43498356 43518638 45238637
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 3, 12:51 AM EDT | Mesoscale Discussion | SPC | Manistee, Mason, Oceana | 54 min |
| May 3, 11:34 AM EDT | Mesoscale Discussion | SPC | Arenac, Bay, Clare, Clinton, Genesee, Gladwin and 28 more | 86 min |
| May 3, 12:41 PM EDT | Severe Thunderstorm Watch | SPC | Alcona, Alpena, Antrim, Arenac, Bay, Benzie and 23 more | 5 hr |
| May 3, 2:35 PM EDT | Severe Thunderstorm Watch | SPC | Allegan, Barry, Berrien, Branch, Calhoun, Cass and 27 more | 8 hr |
| May 3, 3:53 PM EDT | Mesoscale Discussion | SPC | Berrien | 67 min |
| May 3, 4:33 PM EDT | Mesoscale Discussion | SPC | Allegan, Barry, Bay, Calhoun, Cass, Clinton and 15 more | 57 min |
| May 3, 6:57 PM EDT | Mesoscale Discussion | SPC | Allegan, Barry, Berrien, Branch, Calhoun, Cass and 28 more | 63 min |
Nearby
Mesoscale Discussions in Michigan, 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.