255
WHUS53 KGRB 202350
SMWGRB
LMZ521-541-563-210045-
/O.NEW.KGRB.MA.W.0040.260720T2350Z-260721T0045Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SPECIAL MARINE WARNING
NATIONAL WEATHER SERVICE GREEN BAY WI
650 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...
CENTRAL BAY OF GREEN BAY...
OPEN WATERS OF LAKE MICHIGAN FROM ROCK ISLAND PASSAGE TO STURGEON
BAY...
* UNTIL 745 PM CDT.
* AT 650 PM CDT, A SEVERE THUNDERSTORM CAPABLE OF PRODUCING
WATERSPOUTS WAS LOCATED 20 NM NORTH OF CHAMBERS ISLAND, OR 19 NM
WEST OF ROCK ISLAND, MOVING SOUTHEAST AT 40 KNOTS.
HAZARD...WATERSPOUTS, LARGE HAIL, AND WIND GUSTS TO NEARLY 50
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. LARGE HAIL COULD
RESULT IN STRUCTURAL DAMAGE.
* THE STRONG THUNDERSTORM WILL BE NEAR...
DETROIT ISLAND AROUND 710 PM CDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
MOVE TO SAFE HARBOR UNTIL HAZARDOUS WEATHER PASSES.
LAT...LON 4524 8712 4534 8741 4541 8735 4541 8695
4535 8694 4534 8695 4533 8687 4540 8686
4541 8682 4536 8669 4533 8629 4504 8653
4521 8704 4521 8703 4525 8705 4522 8698
4528 8697 4529 8698 4530 8698 4530 8707
TIME...MOT...LOC 2349Z 297DEG 48KT 4553 8725
WATERSPOUT...POSSIBLE
MAX HAIL SIZE...>.75 IN
MAX WIND GUST...50 KTS
UHLMANN
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