Alert archive / Michigan / Mesoscale Discussions in 2012
Mesoscale Discussion 251
The Storm Prediction Center issued this mesoscale discussion at Mar 12, 2012, 8:43 PM EDT for 4 counties in Indiana; 14 counties in Michigan; 7 counties in Ohio. It was in force for 92 min.
The area
The outline as issued.
The facts
- Issued
- Mar 12, 2012, 8:43 PM EDT (00:43 UTC)
- Expired
- Mar 12, 2012, 10:15 PM EDT
- In force
- 92 min
- Issued by
- the Storm Prediction Center
All 25 counties
DeKalb County, IN, LaGrange County, IN, Noble County, IN, Steuben County, IN, Genesee County, MI, Hillsdale County, MI, Huron County, MI, Jackson County, MI, Lapeer County, MI, Lenawee County, MI, Livingston County, MI, Macomb County, MI, Monroe County, MI, Oakland County, MI, Saint Clair County, MI, Sanilac County, MI, Washtenaw County, MI, Wayne County, MI, Defiance County, OH, Fulton County, OH, Henry County, OH, Lucas County, OH, Ottawa County, OH, Williams County, OH, Wood County, OH
The radar
The Detroit radar (KDTX), 32 km from the middle of the area, began a volume at 00:45 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, 0.7 hours before the alert went out and 32 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
- 6 J/kg
- Mixed-layer CIN
- -4 J/kg
- Mixed-layer LCL
- 519 m above ground
- 0-6 km bulk shear
- 60 kt
- 0-1 km storm-relative helicity
- 434 m²/s²
- 0-3 km storm-relative helicity
- 589 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
712
ACUS11 KWNS 130044
SWOMCD
SPC MCD 130043
OHZ000-MIZ000-INZ000-130215-
MESOSCALE DISCUSSION 0251
NWS STORM PREDICTION CENTER NORMAN OK
0743 PM CDT MON MAR 12 2012
AREAS AFFECTED...ERN LWR MI...NERN IND...NWRN OH
CONCERNING...TORNADO WATCH 73...74...
VALID 130043Z - 130215Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 73...74...CONTINUES.
THE NEED FOR AN ADDITIONAL WW IS NOT ANTICIPATED THIS EVENING... BUT
TRENDS WILL BE MONITORED EAST OF WW 74.
BOUNDARY LAYER WARMING/MOISTENING ACROSS CENTRAL INTO EASTERN LOWER
MICHIGAN JUST WAS NOT ENOUGH TO OVERCOME INHIBITIVE RELATIVELY WARM
LAYERS ALOFT...AND ALLOW DISCRETE PRE-FRONTAL STORMS TO MAINTAIN
THEMSELVES. HOWEVER...A BROKEN LINE OF STORMS HAS GRADUALLY EVOLVED
IN CLOSER PROXIMITY TO THE EASTWARD ADVANCING COLD FRONT. THIS
ACTIVITY COULD STILL POSE THE RISK FOR POTENTIALLY DAMAGING WIND
GUSTS AS IT RAPIDLY SPREADS ACROSS THE THUMB AREA AND REMAINDER OF
SOUTHEAST LOWER MICHIGAN BETWEEN NOW AND 02-03Z.
ALSO...THE POTENTIAL FOR ADDITIONAL DISCRETE SUPERCELL DEVELOPMENT
STILL CANNOT YET BE RULED OUT ACROSS NORTHEAST INDIANA INTO
NORTHWEST OHIO...WHERE LOW-LEVEL WARM ADVECTION WILL LINGER ON THE
SOUTHWESTERN PERIPHERY OF THE SIGNIFICANT UPPER TROUGH LIFTING
NORTHEAST OF THE GREAT LAKES REGION THIS EVENING.
..KERR.. 03/13/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...CLE...DTX...IWX...GRR...
LAT...LON 41418311 41078369 41238438 41428590 42228446 43288356
44088299 44678257 43888168 42998153 41728244 41418311SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 12, 11:09 PM EDT | Mesoscale Discussion | SPC | Defiance, Erie, Fulton, Hancock, Henry, Lucas and 6 more | 96 min |
Nearby
Mesoscale Discussions in Michigan, 2012Mesoscale Discussions in Ohio, 2012Mesoscale Discussions in Indiana, 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.