Alert archive / Michigan / Mesoscale Discussions in 2004
Mesoscale Discussion 608
The Storm Prediction Center issued this mesoscale discussion at May 8, 2004, 9:55 PM CDT for 4 states. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- May 8, 2004, 9:55 PM CDT (02:55 UTC)
- Expired
- May 9, 2004, 12:00 AM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 50 counties
Boone County, IL, Cook County, IL, Lake County, IL, McHenry County, IL, Stephenson County, IL, Winnebago County, IL, Allegan County, MI, Barry County, MI, Branch County, MI, Calhoun County, MI, Cass County, MI, Eaton County, MI, Hillsdale County, MI, Ingham County, MI, Jackson County, MI, Kalamazoo County, MI, Lenawee County, MI, Livingston County, MI, Macomb County, MI, Monroe County, MI, Oakland County, MI, Ottawa County, MI, Saint Clair County, MI, Saint Joseph County, MI, Van Buren County, MI, Washtenaw County, MI, Wayne County, MI, Ashtabula County, OH, Cuyahoga County, OH, Erie County, OH, Fulton County, OH, Lake County, OH, Lorain County, OH, Lucas County, OH, Ottawa County, OH, Columbia County, WI, Dane County, WI, Dodge County, WI, Green County, WI, Iowa County, WI, Jefferson County, WI, Kenosha County, WI, Lafayette County, WI, Milwaukee County, WI, Racine County, WI, Rock County, WI, Sauk County, WI, Walworth County, WI, Washington County, WI, Waukesha County, WI
The radar
The Grand Rapids radar (KGRR), 27 km from the middle of the area, began a volume at 02:56 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, 2.9 hours before the alert went out and 183 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
- 1004 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 284 m²/s²
- 0-3 km storm-relative helicity
- 337 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 ACUS11 KWNS 090255 SWOMCD SPC MCD 090255 PAZ000-OHZ000-MIZ000-INZ000-ILZ000-WIZ000-090500- MESOSCALE DISCUSSION 0608 NWS STORM PREDICTION CENTER NORMAN OK 0955 PM CDT SAT MAY 08 2004 AREAS AFFECTED...SRN WI...SRN LWR MI...LAKE ERIE VICINITY CONCERNING...SEVERE THUNDERSTORM WATCH 167... VALID 090255Z - 090500Z CONTINUE REMAINING VALID PORTION OF WW UNTIL 05Z EXPIRATION. LARGE HAIL THREAT WILL CONTINUE TO GRADUALLY BECOME MORE ISOLATED...AND NEW WW IS NOT CURRENTLY ANTICIPATED. BROADER TROUGH WITH A COUPLE OF EMBEDDED SHORT WAVES/SPEED MAXIMA CONTINUES TO PROGRESS ACROSS THE UPPER MISSISSIPPI VALLEY AND GREAT LAKES REGION. LEAD FEATURE ALREADY APPEARS TO BE SHIFTING ACROSS LOWER MICHIGAN...BUT UPSTREAM IMPULSE...AS SUGGESTED BY MODELS AND OBSERVATIONAL DATA...CONTINUES TO SUPPORT VIGOROUS CONVECTIVE DEVELOPMENT IN EAST-WEST BAND ACROSS SOUTHERN WISCONSIN. ACTIVITY IS GENERALLY FOCUSED IN BAROCLINIC ZONE NORTH OF SURFACE WARM FRONT... WHERE FRONTAL INVERSION LIKELY IS MINIMIZING DAMAGING WIND POTENTIAL. HOWEVER...GIVEN CAPE STILL ON THE ORDER OF 1000 TO 2000 J/KG...ISOLATED INTENSE UPDRAFTS WITH LARGE HAIL WILL BE SLOW TO DIMINISH. FORCING FOR CONVECTIVE DEVELOPMENT WILL GRADUALLY SHIFT EAST SOUTHEASTWARD OUT OF SOUTHERN WISCONSIN/CENTRAL LOWER MICHIGAN INTO SOUTHERN LOWER MICHIGAN AND LAKE ERIE OVERNIGHT. UNTIL THEN...TRAINING CONVECTION WILL MAINTAIN THREAT FOR LOCALLY EXCESSIVE RAINFALL ACROSS SOUTHERN WISCONSIN. ..KERR.. 05/09/2004 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...CLE...DTX...IWX...GRR...LOT...MKX...DVN...ARX... 43309056 43568945 43348739 42938512 42918299 43108096 43007942 41788039 41258253 41908567 41878812 42509059
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 9, 1:22 AM CDT | Mesoscale Discussion | SPC | Hancock | 23 min |
| May 9, 11:48 AM CDT | Mesoscale Discussion | SPC | Boone, Cook, DeKalb, DuPage, Kane, Lake and 4 more | 2 hr |
| May 9, 12:55 PM CDT | Severe Thunderstorm Watch | SPC | Cook, DuPage, Lake, Will | 6 hr |
| May 9, 2:46 PM CDT | Mesoscale Discussion | SPC | Cook, Lake | 89 min |
| May 9, 4:46 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, DeKalb, Grundy, Henry and 10 more | 59 min |
| May 9, 5:17 PM CDT | Mesoscale Discussion | SPC | Cook, DuPage, Lake, Will | 88 min |
| May 9, 6:50 PM CDT | Severe Thunderstorm Watch | SPC | Cook, DuPage, Grundy, Kankakee, Kendall, LaSalle and 3 more | 4 hr |
| May 8, 8:46 PM CDT | Mesoscale Discussion | SPC | Clinton, Eaton, Genesee, Gratiot, Ingham, Ionia and 8 more | 119 min |
| May 9, 9:35 AM CDT | Mesoscale Discussion | SPC | Barry, Branch, Calhoun, Cass, Eaton, Hillsdale and 8 more | 55 min |
| May 9, 6:15 PM CDT | Severe Thunderstorm Watch | SPC | Gogebic, Ontonagon | 8 hr |
| May 9, 3:29 PM CDT | Mesoscale Discussion | SPC | Buffalo, Chippewa, Clark, Dunn, Eau Claire, Pepin and 4 more | 91 min |
| May 9, 3:55 PM CDT | Tornado Watch | SPC | Barron, Buffalo, Dunn, Pepin, Pierce, Saint Croix | 5 hr |
| May 9, 5:38 PM CDT | Mesoscale Discussion | SPC | Barron, Buffalo, Burnett, Chippewa, Clark, Douglas and 12 more | 2 hr |
Nearby
Mesoscale Discussions in Michigan, 2004Mesoscale Discussions in Wisconsin, 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.