Note:
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
Note: Click for
Watch Status Reports.
SEL8
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 488
NWS Storm Prediction Center Norman OK
940 PM EDT Sun Sep 6 2020
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Central Lower Michigan
Lake Huron
Lake Michigan
* Effective this Sunday night and Monday morning from 940 PM
until 300 AM EDT.
* Primary threats include...
Scattered large hail and isolated very large hail events to 2
inches in diameter possible
Isolated damaging wind gusts to 70 mph possible
SUMMARY...Scattered thunderstorms are increasing in coverage and
intensity over portions of Lake Michigan and Lower Michigan. This
activity may become occasionally severe, with the potential for
large hail and locally gusty/damaging winds.
The severe thunderstorm watch area is approximately along and 55
statute miles north and south of a line from 40 miles northwest of
Muskegon MI to 25 miles north northeast of Bad Axe MI. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU8).
PRECAUTIONARY/PREPAREDNESS ACTIONS...
REMEMBER...A Severe Thunderstorm Watch means conditions are
favorable for 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. Severe thunderstorms can and occasionally do produce
tornadoes.
&&
AVIATION...A few severe thunderstorms with hail surface and aloft to
2 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 500. Mean storm motion vector
26035.
...Hart
SEL8
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 488
NWS Storm Prediction Center Norman OK
940 PM EDT Sun Sep 6 2020
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Central Lower Michigan
Lake Huron
Lake Michigan
* Effective this Sunday night and Monday morning from 940 PM
until 300 AM EDT.
* Primary threats include...
Scattered large hail and isolated very large hail events to 2
inches in diameter possible
Isolated damaging wind gusts to 70 mph possible
SUMMARY...Scattered thunderstorms are increasing in coverage and
intensity over portions of Lake Michigan and Lower Michigan. This
activity may become occasionally severe, with the potential for
large hail and locally gusty/damaging winds.
The severe thunderstorm watch area is approximately along and 55
statute miles north and south of a line from 40 miles northwest of
Muskegon MI to 25 miles north northeast of Bad Axe MI. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU8).
PRECAUTIONARY/PREPAREDNESS ACTIONS...
REMEMBER...A Severe Thunderstorm Watch means conditions are
favorable for 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. Severe thunderstorms can and occasionally do produce
tornadoes.
&&
AVIATION...A few severe thunderstorms with hail surface and aloft to
2 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 500. Mean storm motion vector
26035.
...Hart
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW8
WW 488 SEVERE TSTM MI LH LM 070140Z - 070700Z
AXIS..55 STATUTE MILES NORTH AND SOUTH OF LINE..
40NW MKG/MUSKEGON MI/ - 25NNE BAX/BAD AXE MI/
..AVIATION COORDS.. 50NM N/S /41NW MKG - 33SE ASP/
HAIL SURFACE AND ALOFT..2 INCHES. WIND GUSTS..60 KNOTS.
MAX TOPS TO 500. MEAN STORM MOTION VECTOR 26035.
LAT...LON 44378680 44918280 43328280 42788680
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU8.
Watch 488 Status Report Messages:
STATUS REPORT #2 ON WW 488
VALID 070425Z - 070540Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 45 NW MKG TO
15 ESE TVC.
..SPC..09/07/20
ATTN...WFO...GRR...APX...DTX...
&&
STATUS REPORT FOR WS 488
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
MIC005-011-017-035-037-051-057-063-067-073-081-085-105-107-111-
117-121-123-127-133-139-145-157-070540-
MI
. MICHIGAN COUNTIES INCLUDED ARE
ALLEGAN ARENAC BAY
CLARE CLINTON GLADWIN
GRATIOT HURON IONIA
ISABELLA KENT LAKE
MASON MECOSTA MIDLAND
MONTCALM MUSKEGON NEWAYGO
OCEANA OSCEOLA OTTAWA
SAGINAW TUSCOLA
$$
LHZ421-422-441-LMZ845-846-847-848-870-872-874-876-070540-
CW
. ADJACENT COASTAL WATERS INCLUDED ARE
SOUTH HAVEN TO HOLLAND MI
HOLLAND TO GRAND HAVEN MI
GRAND HAVEN TO WHITEHALL MI
WHITEHALL TO PENTWATER MI
LAKE MICHIGAN FROM WHITEHALL TO PENTWATER MI 5NM OFFSHORE TO MID
LAKE
LAKE MICHIGAN FROM GRAND HAVEN TO WHITEHALL MI 5NM OFFSHORE TO
MID LAKE
LAKE MICHIGAN FROM HOLLAND TO GRAND HAVEN MI 5NM OFFSHORE TO MID
LAKE
LAKE MICHIGAN FROM SOUTH HAVEN TO HOLLAND MI 5NM OFFSHORE TO MID
LAKE
OUTER SAGINAW BAY SW OF ALABASTER TO PORT AUSTIN MI TO INNER
SAGINAW BAY
INNER SAGINAW BAY SW OF POINT AU GRES TO BAY PORT MI
PORT AUSTIN TO HARBOR BEACH MI
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #1 ON WW 488
VALID 070325Z - 070440Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
..SPC..09/07/20
ATTN...WFO...GRR...APX...DTX...
&&
STATUS REPORT FOR WS 488
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
MIC005-011-017-019-035-037-051-055-057-063-067-069-073-079-081-
085-101-105-107-111-113-117-121-123-127-129-133-139-143-145-157-
165-070440-
MI
. MICHIGAN COUNTIES INCLUDED ARE
ALLEGAN ARENAC BAY
BENZIE CLARE CLINTON
GLADWIN GRAND TRAVERSE GRATIOT
HURON IONIA IOSCO
ISABELLA KALKASKA KENT
LAKE MANISTEE MASON
MECOSTA MIDLAND MISSAUKEE
MONTCALM MUSKEGON NEWAYGO
OCEANA OGEMAW OSCEOLA
OTTAWA ROSCOMMON SAGINAW
TUSCOLA WEXFORD
$$
LHZ421-422-441-LMZ346-366-845-846-847-848-849-868-870-872-874-876-
070440-
CW
. ADJACENT COASTAL WATERS INCLUDED ARE
MANISTEE TO POINT BETSIE MI
LAKE MICHIGAN FROM POINT BETSIE TO MANISTEE MI 5NM OFFSHORE TO
MID LAKE
SOUTH HAVEN TO HOLLAND MI
HOLLAND TO GRAND HAVEN MI
GRAND HAVEN TO WHITEHALL MI
WHITEHALL TO PENTWATER MI
PENTWATER TO MANISTEE MI
LAKE MICHIGAN FROM PENTWATER TO MANISTEE MI 5NM OFFSHORE TO MID
LAKE
LAKE MICHIGAN FROM WHITEHALL TO PENTWATER MI 5NM OFFSHORE TO MID
LAKE
LAKE MICHIGAN FROM GRAND HAVEN TO WHITEHALL MI 5NM OFFSHORE TO
MID LAKE
LAKE MICHIGAN FROM HOLLAND TO GRAND HAVEN MI 5NM OFFSHORE TO MID
LAKE
LAKE MICHIGAN FROM SOUTH HAVEN TO HOLLAND MI 5NM OFFSHORE TO MID
LAKE
OUTER SAGINAW BAY SW OF ALABASTER TO PORT AUSTIN MI TO INNER
SAGINAW BAY
INNER SAGINAW BAY SW OF POINT AU GRES TO BAY PORT MI
PORT AUSTIN TO HARBOR BEACH MI
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
Note:
Click for Complete Product Text.
Tornadoes
Probability of 2 or more tornadoes
|
Low (10%)
|
Probability of 1 or more strong (EF2-EF5) tornadoes
|
Low (<2%)
|
Wind
Probability of 10 or more severe wind events
|
Mod (30%)
|
Probability of 1 or more wind events > 65 knots
|
Low (20%)
|
Hail
Probability of 10 or more severe hail events
|
Mod (40%)
|
Probability of 1 or more hailstones > 2 inches
|
Mod (30%)
|
Combined Severe Hail/Wind
Probability of 6 or more combined severe hail/wind events
|
High (70%)
|
For each watch, probabilities for particular events inside the watch
(listed above in each table) are determined by the issuing forecaster.
The "Low" category contains probability values ranging from less than 2%
to 20% (EF2-EF5 tornadoes), less than 5% to 20% (all other probabilities),
"Moderate" from 30% to 60%, and "High" from 70% to greater than 95%.
High values are bolded and lighter in color to provide awareness of
an increased threat for a particular event.
weather.gov 
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