Note:
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
Note: Click for
Watch Status Reports.
SEL4
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 274
NWS Storm Prediction Center Norman OK
1100 AM EDT Wed Jun 10 2020
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Southwest and west central Michigan
Lake Michigan
* Effective this Wednesday morning and evening from 1100 AM until
600 PM EDT.
* Primary threats include...
Widespread damaging winds and isolated significant gusts to 75
mph likely
Scattered large hail events to 1.5 inches in diameter possible
A tornado or two possible
SUMMARY...Clusters of storms over Lake Michigan will spread inland
over southwest Lower Michigan in the next couple of hours, with
additional storm development likely farther east. The storm
environment favors damaging winds with bowing segments or clusters,
along with isolated large hail and a possible tornado or two.
The severe thunderstorm watch area is approximately along and 40
statute miles east and west of a line from 85 miles north of Grand
Rapids MI to 10 miles south southeast of Kalamazoo MI. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU4).
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
1.5 inches. Extreme turbulence and surface wind gusts to 65 knots. A
few cumulonimbi with maximum tops to 500. Mean storm motion vector
23045.
...Thompson
SEL4
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 274
NWS Storm Prediction Center Norman OK
1100 AM EDT Wed Jun 10 2020
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Southwest and west central Michigan
Lake Michigan
* Effective this Wednesday morning and evening from 1100 AM until
600 PM EDT.
* Primary threats include...
Widespread damaging winds and isolated significant gusts to 75
mph likely
Scattered large hail events to 1.5 inches in diameter possible
A tornado or two possible
SUMMARY...Clusters of storms over Lake Michigan will spread inland
over southwest Lower Michigan in the next couple of hours, with
additional storm development likely farther east. The storm
environment favors damaging winds with bowing segments or clusters,
along with isolated large hail and a possible tornado or two.
The severe thunderstorm watch area is approximately along and 40
statute miles east and west of a line from 85 miles north of Grand
Rapids MI to 10 miles south southeast of Kalamazoo MI. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU4).
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
1.5 inches. Extreme turbulence and surface wind gusts to 65 knots. A
few cumulonimbi with maximum tops to 500. Mean storm motion vector
23045.
...Thompson
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW4
WW 274 SEVERE TSTM MI LM 101500Z - 102200Z
AXIS..40 STATUTE MILES EAST AND WEST OF LINE..
85N GRR/GRAND RAPIDS MI/ - 10SSE AZO/KALAMAZOO MI/
..AVIATION COORDS.. 35NM E/W /34S TVC - 36SE PMM/
HAIL SURFACE AND ALOFT..1.5 INCHES. WIND GUSTS..65 KNOTS.
MAX TOPS TO 500. MEAN STORM MOTION VECTOR 23045.
LAT...LON 44118471 42098470 42098626 44118633
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU4.
Watch 274 Status Report Messages:
STATUS REPORT #4 ON WW 274
VALID 101935Z - 102015Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 20 SW JXN TO
10 W JXN. SEVERE THUNDERSTORM WATCH 274 WILL LIKELY BE CANCELLED
EARLY ONCE THE SQUALL LINE MOVES EAST OF THE WATCH BY 2015 UTC.
..SMITH..06/10/20
ATTN...WFO...GRR...
&&
STATUS REPORT FOR WS 274
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
MIC065-075-102015-
MI
. MICHIGAN COUNTIES INCLUDED ARE
INGHAM JACKSON
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #3 ON WW 274
VALID 101855Z - 101930Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 25 ESE AZO
TO 15 NNW LAN.
..SMITH..06/10/20
ATTN...WFO...GRR...
&&
STATUS REPORT FOR WS 274
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
MIC025-037-045-057-065-075-101930-
MI
. MICHIGAN COUNTIES INCLUDED ARE
CALHOUN CLINTON EATON
GRATIOT INGHAM JACKSON
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #2 ON WW 274
VALID 101805Z - 101900Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 10 S AZO TO
10 SSW GRR TO 20 S HTL.
..SMITH..06/10/20
ATTN...WFO...GRR...
&&
STATUS REPORT FOR WS 274
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
MIC015-025-037-045-057-065-067-073-075-077-117-101900-
MI
. MICHIGAN COUNTIES INCLUDED ARE
BARRY CALHOUN CLINTON
EATON GRATIOT INGHAM
IONIA ISABELLA JACKSON
KALAMAZOO MONTCALM
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #1 ON WW 274
VALID 101630Z - 101800Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
..SMITH..06/10/20
ATTN...WFO...GRR...
&&
STATUS REPORT FOR WS 274
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
MIC005-015-025-035-037-045-057-065-067-073-075-077-081-107-117-
121-123-133-139-159-101800-
MI
. MICHIGAN COUNTIES INCLUDED ARE
ALLEGAN BARRY CALHOUN
CLARE CLINTON EATON
GRATIOT INGHAM IONIA
ISABELLA JACKSON KALAMAZOO
KENT MECOSTA MONTCALM
MUSKEGON NEWAYGO OSCEOLA
OTTAWA VAN BUREN
$$
LMZ844-845-846-847-101800-
CW
. ADJACENT COASTAL WATERS INCLUDED ARE
ST JOSEPH TO SOUTH HAVEN MI
SOUTH HAVEN TO HOLLAND MI
HOLLAND TO GRAND HAVEN MI
GRAND HAVEN TO WHITEHALL MI
$$
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 (20%)
|
Probability of 1 or more strong (EF2-EF5) tornadoes
|
Low (5%)
|
Wind
Probability of 10 or more severe wind events
|
High (80%)
|
Probability of 1 or more wind events > 65 knots
|
High (70%)
|
Hail
Probability of 10 or more severe hail events
|
Mod (40%)
|
Probability of 1 or more hailstones > 2 inches
|
Low (20%)
|
Combined Severe Hail/Wind
Probability of 6 or more combined severe hail/wind events
|
High (>95%)
|
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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