255
WHUS53 KGRB 210200
SMWGRB
LMZ541-563-210245-
/O.NEW.KGRB.MA.W.0042.260721T0200Z-260721T0245Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SPECIAL MARINE WARNING
NATIONAL WEATHER SERVICE GREEN BAY WI
900 PM CDT MON JUL 20 2026
THE NATIONAL WEATHER SERVICE IN GREEN BAY HAS ISSUED A
* SPECIAL MARINE WARNING FOR...
NEARSHORE WATERS FROM WASHINGTON ISLAND TO STURGEON BAY...
OPEN WATERS OF LAKE MICHIGAN FROM ROCK ISLAND PASSAGE TO STURGEON
BAY...
* UNTIL 945 PM CDT.
* AT 900 PM CDT, SEVERE THUNDERSTORMS CAPABLE OF PRODUCING
WATERSPOUTS WERE LOCATED ALONG A LINE FROM 19 NM SOUTHEAST OF ROCK
ISLAND TO 13 NM NORTHWEST OF DETROIT ISLAND, MOVING SOUTHEAST AT 40
KNOTS.
HAZARD...WATERSPOUTS AND WIND GUSTS TO 40 KNOTS.
SOURCE...RADAR INDICATED.
IMPACT...WATERSPOUTS CAN EASILY OVERTURN BOATS AND CREATE LOCALLY
HAZARDOUS SEAS. SMALL CRAFT COULD BE DAMAGED IN BRIEFLY
HIGHER WINDS AND SUDDENLY HIGHER WAVES.
* THIS STRONG THUNDERSTORM WILL REMAIN OVER MAINLY OPEN WATERS.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
MOVE TO SAFE HARBOR UNTIL HAZARDOUS WEATHER PASSES.
LAT...LON 4524 8697 4532 8692 4530 8690 4531 8690
4533 8692 4534 8691 4533 8688 4533 8687
4536 8686 4537 8685 4540 8684 4540 8686
4541 8681 4536 8669 4533 8629 4513 8644
4509 8648
TIME...MOT...LOC 0159Z 300DEG 48KT 4526 8646 4529 8675 4547 8717
WATERSPOUT...POSSIBLE
MAX HAIL SIZE...<.75 IN
MAX WIND GUST...40 KTS
UHLMANN
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