Alert archive / Michigan / Tornado Watches in 2005
Tornado Watch 734
The Storm Prediction Center issued this tornado watch at Aug 18, 2005, 11:55 PM EDT for 27 counties in Michigan. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 18, 2005, 11:55 PM EDT (03:55 UTC)
- Expired
- Aug 19, 2005, 4:08 AM EDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
All 27 counties
Barry County, MI, Benzie County, MI, Calhoun County, MI, Clare County, MI, Clinton County, MI, Crawford County, MI, Eaton County, MI, Grand Traverse County, MI, Gratiot County, MI, Ingham County, MI, Ionia County, MI, Isabella County, MI, Jackson County, MI, Kalamazoo County, MI, Kalkaska County, MI, Kent County, MI, Lake County, MI, Manistee County, MI, Mecosta County, MI, Midland County, MI, Missaukee County, MI, Montcalm County, MI, Newaygo County, MI, Osceola County, MI, Ottawa County, MI, Roscommon County, MI, Wexford County, MI
The radar
The Grand Rapids radar (KGRR), 90 km from the middle of the area, began a volume at 03:58 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.
Warnings issued inside it
5 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 19, 12:00 AM EDT | Severe Thunderstorm Warning | GRR | Lake | 46 min |
| Aug 19, 12:34 AM EDT | Severe Thunderstorm Warning | GRR | Mecosta | 29 min |
| Aug 19, 12:50 AM EDT | Severe Thunderstorm Warning | GRR | Osceola | 43 min |
| Aug 19, 1:01 AM EDT | Severe Thunderstorm Warning | GRR | Clare, Isabella | 45 min |
| Aug 19, 1:43 AM EDT | Severe Thunderstorm Warning | GRR | Osceola | 19 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Detroit, MI (KDTX), launched 00:00Z, 3.9 hours before the alert went out and 206 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
- 142 J/kg
- Mixed-layer CIN
- -56 J/kg
- Mixed-layer LCL
- 1296 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 146 m²/s²
- 0-3 km storm-relative helicity
- 315 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.3
The text
As transmitted, in the capitals the NWS used until 2016.
000
WWUS20 KWNS 190355
SEL4
SPC WW 190355
MIZ000-LMZ000-191000-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 734
NWS STORM PREDICTION CENTER NORMAN OK
1055 PM CDT THU AUG 18 2005
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
SOUTHWEST AND CENTRAL LOWER MICHIGAN
LAKE MICHIGAN
EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 1055 PM
UNTIL 500 AM CDT.
TORNADOES...HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 50 STATUTE MILES
EAST AND WEST OF A LINE FROM 5 MILES NORTH NORTHWEST OF TRAVERSE
CITY MICHIGAN TO 30 MILES EAST SOUTHEAST OF KALAMAZOO MICHIGAN.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU4).
REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA.
PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING
WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
WARNINGS.
OTHER WATCH INFORMATION...CONTINUE...WW 731...WW 733...
DISCUSSION...STRONG MID/UPPER LEVEL TROUGH WILL SPREAD ENEWD WITH
ACCOMPANYING 45-50 KT WLY MID LEVEL JET OVERSPREADING LOWER MI
TONIGHT. SURFACE WARM FRONT WILL LIKELY SHIFT N-NEWD THROUGH THE
NIGHT AS LOW CENTER DEVELOPS ACROSS NRN LOWER MI. ACCOMPANYING
LARGE SCALE ASCENT WILL INCREASE STORMS OVER THE REGION WITH THE
THREAT OF SUPERCELLS. ENHANCED LOW LEVEL SHEAR AND LOW LCLS WITHIN
MOIST WARM SECTOR WILL BECOME FAVORABLE FOR A THREAT OF TORNADOES.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 26025.
...EVANS
444,0843 420,0840 420,0855 444,0863SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 10:28 PM EDT | Mesoscale Discussion | SPC | Allegan, Barry, Berrien, Branch, Calhoun, Cass and 4 more | 92 min |
| Aug 19, 2:08 AM EDT | Mesoscale Discussion | SPC | Alcona, Arenac, Barry, Bay, Benzie, Calhoun and 31 more | 97 min |
Nearby
Tornado Watches in Michigan, 2005Every tornado watch in 2005
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.