Alert archive / Michigan / Mesoscale Discussions in 2004
Mesoscale Discussion 721
The Storm Prediction Center issued this mesoscale discussion at May 17, 2004, 3:05 PM EST for 5 counties in Indiana; 50 counties in Michigan; Fulton County, Williams County, Ohio. It was in force for 85 min.
The area
The outline as issued.
The facts
- Issued
- May 17, 2004, 3:05 PM EST (20:05 UTC)
- Expired
- May 17, 2004, 4:30 PM EST
- In force
- 85 min
- Issued by
- the Storm Prediction Center
All 57 counties
DeKalb County, IN, Elkhart County, IN, LaGrange County, IN, Saint Joseph County, IN, Steuben County, IN, Alcona County, MI, Alpena County, MI, Antrim County, MI, Arenac County, MI, Barry County, MI, Bay County, MI, Branch County, MI, Calhoun County, MI, Cass County, MI, Cheboygan County, MI, Clare County, MI, Clinton County, MI, Crawford County, MI, Eaton County, MI, Genesee County, MI, Gladwin County, MI, Grand Traverse County, MI, Gratiot County, MI, Hillsdale County, MI, Huron County, MI, Ingham County, MI, Ionia County, MI, Iosco County, MI, Isabella County, MI, Jackson County, MI, Kalamazoo County, MI, Kalkaska County, MI, Kent County, MI, Lapeer County, MI, Lenawee County, MI, Livingston County, MI, Midland County, MI, Missaukee County, MI, Monroe County, MI, Montcalm County, MI, Montmorency County, MI, Oakland County, MI, Ogemaw County, MI, Osceola County, MI, Oscoda County, MI, Otsego County, MI, Roscommon County, MI, Saginaw County, MI, Saint Joseph County, MI, Sanilac County, MI, Shiawassee County, MI, Tuscola County, MI, Washtenaw County, MI, Wayne County, MI, Wexford County, MI, Fulton County, OH, Williams County, OH
The radar
The Grand Rapids radar (KGRR), 100 km from the middle of the area, began a volume at 20:04 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 12:00Z, 8.1 hours before the alert went out and 137 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
- 694 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 188 m²/s²
- 0-3 km storm-relative helicity
- 252 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
370 ACUS11 KWNS 172005 SWOMCD SPC MCD 172005 MIZ000-OHZ000-INZ000-172130- MESOSCALE DISCUSSION 0721 NWS STORM PREDICTION CENTER NORMAN OK 0305 PM CDT MON MAY 17 2004 AREAS AFFECTED...LOWER MI...NORTHERN IND...NORTHWESTERN OH CONCERNING...SEVERE THUNDERSTORM WATCH 210... VALID 172005Z - 172130Z SCATTERED STRONG/SEVERE STORMS PERSIST ACROSS SOUTHEAST LOWER MI NEAR DETROIT...AND ACROSS CENTRAL LOWER MI FROM KENT TO BAY COUNTIES. SEVERAL OF THESE STORMS HAVE SHOWN MID LEVEL ROTATION...AND ARE CAPABLE OF LARGE HAIL AND DAMAGING WINDS. SBCAPE VALUES OF 2500 J/KG AND 30-40 KNOTS OF DEEP LAYER SHEAR WILL MAINTAIN A RISK OF ORGANIZED SEVERE STORMS OVER SOUTHERN AND EASTERN MI FOR SEVERAL MORE HOURS. CURRENT ACTIVITY MAY DEVELOP NORTHEASTWARD FROM WATCH INTO NORTHEAST LOWER MI. ALSO...STORMS DEVELOPING ACROSS EASTERN WI NORTH OF GRB MAY TRACK ACROSS THE LAKE AT 40 KNOTS AND INTO NORTHWEST LOWER MI BY 22Z. PARTS OF NORTHERN LOWER MI MAY REQUIRE A WW IN THE NEXT 1-2 HOURS. ..HART.. 05/17/2004 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...CLE...DTX...APX...IWX...GRR... 45828452 45008308 43528259 41798339 41358487 41598639 42348610 43908517 44308631
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 17, 10:22 AM EST | Mesoscale Discussion | SPC | Allen, Benton, Carroll, Cass, Clinton, DeKalb and 26 more | 2 hr |
| May 17, 12:05 PM EST | Severe Thunderstorm Watch | SPC | DeKalb, Elkhart, LaGrange, Noble, Saint Joseph, Steuben | 7 hr |
| May 17, 1:09 PM EST | Mesoscale Discussion | SPC | Adams, Bartholomew, Blackford, Brown, Clark, Crawford and 44 more | 2 hr |
| May 17, 12:41 PM EST | Mesoscale Discussion | SPC | Menominee | 3 hr |
| May 17, 4:46 PM EST | Mesoscale Discussion | SPC | Arenac, Bay, Clinton, Genesee, Gladwin, Gratiot and 19 more | 89 min |
| May 17, 1:45 PM EST | Severe Thunderstorm Watch | SPC | Ashland, Crawford, Cuyahoga, Erie, Geauga, Hancock and 12 more | 5 hr |
| May 17, 4:23 PM EST | Mesoscale Discussion | SPC | Ashland, Crawford, Cuyahoga, Erie, Geauga, Hancock and 12 more | 2 hr |
| May 17, 5:50 PM EST | Mesoscale Discussion | SPC | Ashtabula, Columbiana, Geauga, Mahoning, Medina, Portage and 4 more | 85 min |
Nearby
Mesoscale Discussions in Michigan, 2004Mesoscale Discussions in Indiana, 2004Mesoscale Discussions in Ohio, 2004Every mesoscale discussion in 2004
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.