Note:
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
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SEL7
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 107
NWS Storm Prediction Center Norman OK
1110 PM EDT Mon Apr 13 2026
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Central Lower Michigan
Lake Huron
Lake Michigan
* Effective this Monday night and Tuesday morning from 1110 PM
until 500 AM EDT.
* Primary threats include...
Scattered damaging wind gusts to 70 mph possible
Scattered large hail events to 1.5 inches in diameter possible
SUMMARY...Thunderstorms will develop and overspread much of Lower
Michigan overnight as strong low-level winds overspread the area. A
few of the stronger storms will pose a risk of hail and damaging
winds.
The severe thunderstorm watch area is approximately along and 60
statute miles north and south of a line from 60 miles west southwest
of Manistee MI to 25 miles east of Bad Axe MI. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU7).
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.
&&
OTHER WATCH INFORMATION...CONTINUE...WW 105...WW 106...
AVIATION...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
27030.
...Hart
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW7
WW 107 SEVERE TSTM MI LH LM 140310Z - 140900Z
AXIS..60 STATUTE MILES NORTH AND SOUTH OF LINE..
60WSW MBL/MANISTEE MI/ - 25E BAX/BAD AXE MI/
..AVIATION COORDS.. 50NM N/S /52SE GRB - 33NNE ECK/
HAIL SURFACE AND ALOFT..1.5 INCHES. WIND GUSTS..60 KNOTS.
MAX TOPS TO 500. MEAN STORM MOTION VECTOR 27030.
LAT...LON 44808736 44658249 42918249 43068736
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU7.
Watch 107 Status Report Messages:
STATUS REPORT #3 ON WW 107
VALID 140715Z - 140840Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 35 NW MKG TO
35 NNE MKG TO 15 SW HTL TO 15 S APN.
FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 417
..DEAN..04/14/26
ATTN...WFO...APX...DTX...GRR...
&&
STATUS REPORT FOR WS 107
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
MIC011-017-035-049-051-057-063-073-085-087-105-107-111-117-121-
123-127-129-133-143-145-147-151-155-157-140840-
MI
. MICHIGAN COUNTIES INCLUDED ARE
ARENAC BAY CLARE
GENESEE GLADWIN GRATIOT
HURON ISABELLA LAKE
LAPEER MASON MECOSTA
MIDLAND MONTCALM MUSKEGON
NEWAYGO OCEANA OGEMAW
OSCEOLA ROSCOMMON SAGINAW
ST. CLAIR SANILAC SHIAWASSEE
TUSCOLA
$$
LCZ422-LHZ421-422-441-442-443-LMZ847-848-849-868-870-872-
140840-
CW
. ADJACENT COASTAL WATERS INCLUDED ARE
ST. CLAIR RIVER
GRAND HAVEN TO WHITEHALL MI
WHITEHALL TO PENTWATER MI
PENTWATER TO MANISTEE MI
LAKE MICHIGAN FROM PENTWATER TO MANISTEE MI 5NM OFFSHORE TO MID
LAKE
LAKE MICHIGAN FROM WHITEHALL TO PENTWATER MI 5NM OFFSHORE TO MID
LAKE
LAKE MICHIGAN FROM GRAND HAVEN TO WHITEHALL MI 5NM OFFSHORE TO
MID LAKE
OUTER SAGINAW BAY SW OF ALABASTER TO PORT AUSTIN MI TO INNER
SAGINAW BAY
INNER SAGINAW BAY SW OF POINT AU GRES TO BAY PORT MI
PORT AUSTIN TO HARBOR BEACH MI
HARBOR BEACH TO PORT SANILAC MI
PORT SANILAC TO PORT HURON MI
$$
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.
$$
STATUS REPORT #2 ON WW 107
VALID 140620Z - 140740Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 30 SW MBL TO
25 SSE TVC TO 25 NE TVC.
..DEAN..04/14/26
ATTN...WFO...APX...DTX...GRR...
&&
STATUS REPORT FOR WS 107
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
MIC011-017-035-039-049-051-057-063-073-085-087-101-105-107-111-
113-117-121-123-127-129-133-143-145-147-151-155-157-165-
140740-
MI
. MICHIGAN COUNTIES INCLUDED ARE
ARENAC BAY CLARE
CRAWFORD GENESEE GLADWIN
GRATIOT HURON ISABELLA
LAKE LAPEER MANISTEE
MASON MECOSTA MIDLAND
MISSAUKEE MONTCALM MUSKEGON
NEWAYGO OCEANA OGEMAW
OSCEOLA ROSCOMMON SAGINAW
ST. CLAIR SANILAC SHIAWASSEE
TUSCOLA WEXFORD
$$
LCZ422-LHZ421-422-441-442-443-LMZ847-848-849-868-870-872-
140740-
CW
. ADJACENT COASTAL WATERS INCLUDED ARE
ST. CLAIR RIVER
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
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
HARBOR BEACH TO PORT SANILAC MI
PORT SANILAC TO PORT HURON 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 107
VALID 140450Z - 140540Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 35 E MTW TO
5 ENE TVC.
FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 416
..HART..04/14/26
ATTN...WFO...APX...DTX...GRR...
&&
STATUS REPORT FOR WS 107
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
MIC011-017-035-039-049-051-055-057-063-073-079-085-087-101-105-
107-111-113-117-121-123-127-129-133-143-145-147-151-155-157-165-
140540-
MI
. MICHIGAN COUNTIES INCLUDED ARE
ARENAC BAY CLARE
CRAWFORD GENESEE GLADWIN
GRAND TRAVERSE GRATIOT HURON
ISABELLA KALKASKA LAKE
LAPEER MANISTEE MASON
MECOSTA MIDLAND MISSAUKEE
MONTCALM MUSKEGON NEWAYGO
OCEANA OGEMAW OSCEOLA
ROSCOMMON SAGINAW ST. CLAIR
SANILAC SHIAWASSEE TUSCOLA
WEXFORD
$$
LCZ422-LHZ421-422-441-442-443-LMZ847-848-849-868-870-872-
140540-
CW
. ADJACENT COASTAL WATERS INCLUDED ARE
ST. CLAIR RIVER
GRAND HAVEN TO WHITEHALL MI
WHITEHALL TO PENTWATER MI
PENTWATER TO MANISTEE MI
LAKE MICHIGAN FROM PENTWATER TO MANISTEE MI 5NM OFFSHORE TO MID
LAKE
LAKE MICHIGAN FROM WHITEHALL TO PENTWATER MI 5NM OFFSHORE TO MID
LAKE
LAKE MICHIGAN FROM GRAND HAVEN TO WHITEHALL MI 5NM OFFSHORE TO
MID LAKE
OUTER SAGINAW BAY SW OF ALABASTER TO PORT AUSTIN MI TO INNER
SAGINAW BAY
INNER SAGINAW BAY SW OF POINT AU GRES TO BAY PORT MI
PORT AUSTIN TO HARBOR BEACH MI
HARBOR BEACH TO PORT SANILAC MI
PORT SANILAC TO PORT HURON MI
$$
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 (
|
Wind
| Probability of 10 or more severe wind events | Mod (40%) |
| Probability of 1 or more wind events > 65 knots | Low (20%) |
Hail
| Probability of 10 or more severe hail events | Mod (50%) |
| 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 (80%) |
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.
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