Note:
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
Note: Click for
Watch Status Reports.
SEL6
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 506
NWS Storm Prediction Center Norman OK
735 PM EST Tue Nov 10 2020
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Northern Indiana
Lower Michigan
* Effective this Tuesday night from 735 PM until Midnight EST.
* Primary threats include...
Isolated damaging wind gusts to 70 mph possible
A tornado or two possible
SUMMARY...A fast-moving squall line will continue to race
northeastward this evening. While the overall intensity of the line
may gradually diminish, the fast forward motion and strengthening
winds in the lower part of the atmosphere will support the continued
possibility of isolated damaging wind gusts across parts of Lower
Michigan and far northern Indiana.
The severe thunderstorm watch area is approximately along and 35
statute miles east and west of a line from 95 miles north northeast
of Grand Rapids MI to 25 miles south of South Bend IN. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU6).
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 505...
AVIATION...A few severe thunderstorms with hail surface and aloft to
0.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 400. Mean storm motion vector
23045.
...Guyer
SEL6
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 506
NWS Storm Prediction Center Norman OK
735 PM EST Tue Nov 10 2020
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Northern Indiana
Lower Michigan
* Effective this Tuesday night from 735 PM until Midnight EST.
* Primary threats include...
Isolated damaging wind gusts to 70 mph possible
A tornado or two possible
SUMMARY...A fast-moving squall line will continue to race
northeastward this evening. While the overall intensity of the line
may gradually diminish, the fast forward motion and strengthening
winds in the lower part of the atmosphere will support the continued
possibility of isolated damaging wind gusts across parts of Lower
Michigan and far northern Indiana.
The severe thunderstorm watch area is approximately along and 35
statute miles east and west of a line from 95 miles north northeast
of Grand Rapids MI to 25 miles south of South Bend IN. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU6).
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 505...
AVIATION...A few severe thunderstorms with hail surface and aloft to
0.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 400. Mean storm motion vector
23045.
...Guyer
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW6
WW 506 SEVERE TSTM IN MI 110035Z - 110500Z
AXIS..35 STATUTE MILES EAST AND WEST OF LINE..
95NNE GRR/GRAND RAPIDS MI/ - 25S SBN/SOUTH BEND IN/
..AVIATION COORDS.. 30NM E/W /45SE TVC - 26S GIJ/
HAIL SURFACE AND ALOFT..0.5 INCH. WIND GUSTS..60 KNOTS.
MAX TOPS TO 400. MEAN STORM MOTION VECTOR 23045.
LAT...LON 44158408 41348565 41348699 44158549
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU6.
Watch 506 Status Report Messages:
STATUS REPORT #2 ON WW 506
VALID 110350Z - 110440Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 20 SE AZO TO
20 SE GRR TO 30 W MBS TO 30 ESE HTL.
FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 1787
..GUYER..11/11/20
ATTN...WFO...IWX...GRR...
&&
STATUS REPORT FOR WS 506
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
MIC015-025-037-045-057-067-110440-
MI
. MICHIGAN COUNTIES INCLUDED ARE
BARRY CALHOUN CLINTON
EATON GRATIOT IONIA
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #1 ON WW 506
VALID 110240Z - 110340Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 25 SSW SBN
TO 20 WNW AZO TO 15 SSE HTL.
..SPC..11/11/20
ATTN...WFO...IWX...GRR...
&&
STATUS REPORT FOR WS 506
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
INC039-099-141-110340-
IN
. INDIANA COUNTIES INCLUDED ARE
ELKHART MARSHALL ST. JOSEPH
$$
MIC005-015-025-027-035-037-045-057-067-073-077-081-117-149-159-
110340-
MI
. MICHIGAN COUNTIES INCLUDED ARE
ALLEGAN BARRY CALHOUN
CASS CLARE CLINTON
EATON GRATIOT IONIA
ISABELLA KALAMAZOO KENT
MONTCALM ST. JOSEPH VAN BUREN
$$
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 (<2%)
|
Wind
Probability of 10 or more severe wind events
|
Mod (30%)
|
Probability of 1 or more wind events > 65 knots
|
Low (<5%)
|
Hail
Probability of 10 or more severe hail events
|
Low (<5%)
|
Probability of 1 or more hailstones > 2 inches
|
Low (<5%)
|
Combined Severe Hail/Wind
Probability of 6 or more combined severe hail/wind events
|
Mod (50%)
|
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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