Alert archive / Michigan / Tornado Watches in 2001
Tornado Watch 139
The Storm Prediction Center issued this tornado watch at Apr 12, 2001, 12:00 AM EDT for 32 counties in Michigan. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 12, 2001, 12:00 AM EDT (04:00 UTC)
- Expired
- Apr 12, 2001, 5:00 AM EDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
All 32 counties
Allegan County, MI, Barry County, MI, Bay County, MI, Calhoun County, MI, Clare County, MI, Clinton County, MI, Crawford County, MI, Eaton County, MI, Gladwin 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, Mecosta County, MI, Midland County, MI, Missaukee County, MI, Montcalm County, MI, Newaygo County, MI, Ogemaw County, MI, Osceola County, MI, Oscoda County, MI, Roscommon County, MI, Saginaw County, MI, Shiawassee County, MI, Van Buren County, MI, Wexford County, MI
Warnings issued inside it
10 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 12, 12:09 AM EDT | Severe Thunderstorm Warning | GRR | Kent | 36 min |
| Apr 12, 12:10 AM EDT | Flash Flood Warning | APX | Crawford, Montmorency | 6 hr |
| Apr 12, 12:14 AM EDT | Severe Thunderstorm Warning | GRR | Mecosta, Montcalm | 31 min |
| Apr 12, 12:19 AM EDT | Tornado Warning | GRR | Newaygo | 26 min |
| Apr 12, 12:25 AM EDT | Severe Thunderstorm Warning | GRR | Osceola | 35 min |
| Apr 12, 12:29 AM EDT | Tornado Warning | GRR | Mecosta | 31 min |
| Apr 12, 12:42 AM EDT | Severe Thunderstorm Warning | GRR | Clare, Isabella | 48 min |
| Apr 12, 12:45 AM EDT | Severe Thunderstorm Warning | APX | Missaukee | 45 min |
| Apr 12, 12:57 AM EDT | Tornado Warning | GRR | Clare, Osceola | 33 min |
| Apr 12, 1:13 AM EDT | Severe Thunderstorm Warning | APX | Roscommon | 47 min |
The nearest sounding before it
Detroit, MI (KDTX), launched 00:00Z, 4.0 hours before the alert went out and 160 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
- 156 J/kg
- Mixed-layer CIN
- -122 J/kg
- Mixed-layer LCL
- 557 m above ground
- 0-6 km bulk shear
- 66 kt
- 0-1 km storm-relative helicity
- 196 m²/s²
- 0-3 km storm-relative helicity
- 233 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.6
The text
As transmitted, in the capitals the NWS used until 2016.
000
WWUS9 KMKC 120400
SEL9
SEL9
MKC WW 120355
MIZ000-120900-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 139
STORM PREDICTION CENTER NORMAN OK
1155 PM EDT WED APR 11 2001
THE STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
LOWER MICHIGAN
EFFECTIVE THIS THURSDAY MORNING FROM MIDNIGHT EDT UNTIL 500 AM EDT.
TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS TO
70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE TORNADO WATCH AREA IS ALONG AND 55 STATUTE MILES EAST AND WEST
OF A LINE FROM 15 MILES SOUTHEAST OF KALAMAZOO MICHIGAN TO 35 MILES
NORTH OF HOUGHTON LAKE MICHIGAN.
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...THIS TORNADO WATCH REPLACES TORNADO WATCH
NUMBER 138. WATCH NUMBER 138 WILL NOT BE IN EFFECT AFTER MIDNIGHT
EDT.
DISCUSSION...THREAT FOR ISOLATED TORNADOES EXPECTED TO PERSIST OVER
WW REGION AS ZONE OF VERY STRONG /AOA 75 KTS/ DEEP LAYER SHEAR
OVERSPREADS REGION FROM THE SW. WHILE SHEAR IS LARGELY
UNIDIRECTIONAL...STRENGTH SUGGESTS POTENTIAL FOR EMBEDDED
SUPERCELLS WITH LEWP CREST TORNADOES.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS `WITH HAIL
SURFACE AND ALOFT TO 1 INCH...EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450.
MEAN STORM MOTION VECTOR 22045.
...CORFIDI
;445,0833 420,0841 420,0862 445,0854;Nearby
Tornado Watches in Michigan, 2001Every tornado watch in 2001
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.