Alert archive / Michigan / Tornado Watches in 2001

Tornado Watch 823

November 24, 200119 counties in Michigan

The Storm Prediction Center issued this tornado watch at Nov 24, 2001, 10:00 PM EST for 19 counties in Michigan. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued
Nov 24, 2001, 10:00 PM EST (03:00 UTC)
Expired
Nov 25, 2001, 2:00 AM EST
In force
4 hr
Issued by
the Storm Prediction Center

Counties Barry County, MI, Branch County, MI, Calhoun County, MI, Clinton County, MI, Eaton County, MI, Gratiot County, MI, Hillsdale County, MI, Ingham County, MI, Ionia County, MI, Isabella County, MI, Jackson County, MI, Kalamazoo County, MI, Kent County, MI, Lenawee County, MI, Mecosta County, MI, Midland County, MI, Montcalm County, MI, Saint Joseph County, MI, Shiawassee County, MI

The nearest sounding before it

Detroit, MI (KDTX), launched 00:00Z, 3.0 hours before the alert went out and 111 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.

Skew-T log-pSkew-T log-p diagram, Detroit, MI at 00:00Z on 2001-11-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Detroit, MI at 00:00Z on 2001-11-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 91 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
625 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
91 m²/s²
0-3 km storm-relative helicity
130 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WWUS20 KWNS 250253
SEL3  
SPC WW 250250
MIZ000-250700-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 823
STORM PREDICTION CENTER NORMAN OK
950 PM EST SAT NOV 24 2001

THE STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF

   CENTRAL AND SOUTHERN LOWER MICHIGAN                           

EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 1000 PM UNTIL
200 AM EST.

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 40 STATUTE MILES EAST AND WEST
OF A LINE FROM 65 MILES NORTH NORTHEAST OF GRAND RAPIDS MICHIGAN TO
35 MILES SOUTH SOUTHWEST OF JACKSON 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...  CONTINUE...WW 821...WW 822...

DISCUSSION...LINE OF SMALL SUPERCELLULAR STORMS CONTINUES TO
ORGANIZE AND MOVE EASTWARD ACROSS NORTHERN IND AND WESTERN LOWER
MI.  STORMS WITHIN LINE MAY BE CAPABLE OF BRIEF TORNADOES AND
DAMAGING WINDS FOR A FEW MORE HOURS BEFORE DIMINISHING.

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 21035.

...HART

434,0841 414,0835 414,0853 434,0854

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.