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 336
NWS STORM PREDICTION CENTER NORMAN OK
445 PM CDT MON JUN 22 2015
THE NWS STORM PREDICTION CENTER HAS ISSUED A
* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
WESTERN UPPER PENINSULA OF MICHIGAN
NORTHERN WISCONSIN
LAKE SUPERIOR
* EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 445 PM UNTIL
1000 PM CDT.
* PRIMARY THREATS INCLUDE...
ISOLATED SIGNIFICANT DAMAGING WIND GUSTS TO 75 MPH POSSIBLE
ISOLATED LARGE HAIL EVENTS TO 1 INCH IN DIAMETER POSSIBLE
SUMMARY...BROKEN LINE OF THUNDERSTORMS WILL DEVELOP QUICKLY ACROSS
THE WATCH AREA THIS EVENING. WHILE INSTABILITY IS LIMITED...STRONG
DEEP-LAYER WIND FIELDS AND DYNAMIC FORCING ASSOCIATED WITH PASSING
FRONT AND UPPER SYSTEM...WILL CONTRIBUTE TO STORM ORGANIZATION WITH
THE CHANCE FOR MARGINALLY SEVERE HAIL TO AN INCH IN DIAMETER AND
WIND GUSTS IN EXCESS OF 50 KT.
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 100
STATUTE MILES EITHER SIDE OF A LINE FROM 35 MILES NORTHEAST OF
IRONWOOD MICHIGAN TO 25 MILES WEST SOUTHWEST OF RHINELANDER
WISCONSIN. 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 334...WW 335...
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65 KNOTS.
A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 350. MEAN STORM MOTION
VECTOR 27040.
...CARBIN
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW6
WW 336 SEVERE TSTM MI WI LS 222145Z - 230300Z
AXIS..100 STATUTE MILES EITHER SIDE OF LINE..
35NE IWD/IRONWOOD MI/ - 25WSW RHI/RHINELANDER WI/
..AVIATION COORDS.. 85NM EITHER SIDE /76N RHI - 23WSW RHI/
HAIL SURFACE AND ALOFT..1 INCH. WIND GUSTS..65 KNOTS.
MAX TOPS TO 350. MEAN STORM MOTION VECTOR 27040.
LAT...LON 46498758 45098797 45849194 47249166
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU6.
Watch 336 Status Report Message has not been issued yet.
Note:
Click for Complete Product Text.
Tornadoes
Probability of 2 or more tornadoes
|
Low (10%)
|
Probability of 1 or more strong (F2-F5) tornadoes
|
Low (5%)
|
Wind
Probability of 10 or more severe wind events
|
Mod (30%)
|
Probability of 1 or more wind events > 65 knots
|
Mod (30%)
|
Hail
Probability of 10 or more severe hail events
|
Mod (30%)
|
Probability of 1 or more hailstones > 2 inches
|
Low (10%)
|
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% (F2-F5 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 
@NWSSPC
