678 FLUS43 KLSX 181100 HWOLSX Hazardous Weather Outlook National Weather Service St Louis MO 600 AM CDT Mon May 18 2026 ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027- 034>036-041-042-047>052-059>065-072>075-084-085-099-191100- Greene IL-Macoupin IL-Montgomery IL-Bond IL-Fayette IL-Clinton IL- Marion IL-Washington IL-Randolph IL-Adams IL-Brown IL-Pike IL- Calhoun IL-Jersey IL-Madison IL-Saint Clair IL-Monroe IL-Knox MO- Lewis MO-Shelby MO-Marion MO-Monroe MO-Ralls MO-Pike MO-Boone MO- Audrain MO-Moniteau MO-Cole MO-Osage MO-Callaway MO-Montgomery MO- Lincoln MO-Gasconade MO-Warren MO-Saint Charles MO-Franklin MO- Saint Louis MO-Saint Louis City MO-Jefferson MO-Crawford MO- Washington MO-Saint Francois MO-Sainte Genevieve MO-Iron MO- Madison MO-Reynolds MO- 600 AM CDT Mon May 18 2026 This Hazardous Weather Outlook is for portions of eastern and central Missouri as well as west central and southwest Illinois. .DAYS ONE THROUGH SEVEN...Today through Sunday. More detailed information can be accessed at: https://www.weather.gov/media/lsx/DssPacket.pdf The Area Forecast Discussion is available at: https://forecast.weather.gov/ product.php?issuedby=LSX&product=AFD&site=lsx .KEY MESSAGES... - Widespread showers and thunderstorms are expected throughout the day with heavy rainfall in some locations potentially leading to flash flooding. - A few strong to severe thunderstorms are possible this afternoon and evening with the main hazards being hail and damaging wind gusts. - Additional thunderstorms are forecast late tonight and early Tuesday morning with another round possible along a cold front Tuesday afternoon/evening. NOTE: Starting May 29, 2026, this outlook product will be discontinued. Please see the above products for more detailed forecast information. $$ WFO LSX  939 FLUS43 KMKX 181123 HWOMKX Hazardous Weather Outlook National Weather Service Milwaukee/Sullivan WI 623 AM CDT Mon May 18 2026 WIZ046-047-051-052-056>060-062>072-191130- Marquette-Green Lake-Fond du Lac-Sheboygan-Sauk-Columbia-Dodge- Washington-Ozaukee-Iowa-Dane-Jefferson-Waukesha-Milwaukee- Lafayette-Green-Rock-Walworth-Racine-Kenosha- 623 AM CDT Mon May 18 2026 This Hazardous Weather Outlook is for portions of east central Wisconsin, south central Wisconsin and southeast Wisconsin. .DAY ONE...Today and Tonight A round of scattered thunderstorms is expected this morning then again late tonight. Hail and gusty winds will be the main hazards. An isolated tornado can't be ruled out south of Interstate 94 with activity tonight. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday A final round of thunderstorms is possible on Tuesday with just a marginal threat of severe storms in far southeast Wisconsin. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed today or tonight. $$ LMZ643>646-191130- Sheboygan to Port Washington WI- Port Washington to North Point Light WI- North Point Light to Wind Point WI- Wind Point WI to Winthrop Harbor IL- 623 AM CDT Mon May 18 2026 This Hazardous Weather Outlook is for the nearshore waters from Sheboygan Wisconsin to Winthrop Harbor Illinois. .DAY ONE...Today and Tonight A Small Craft Advisory is in effect north of Port Washington today for high waves. The rest of the nearshore zones will have Small Craft Advisories tonight for increasing winds and waves. There is a chance for thunderstorms with gusty winds this morning and again late tonight. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday Chances for thunderstorms continue on Tuesday. A Small Craft Advisory continues through Tuesday. $$ LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868- 870-872-874-876-878-191130- Lake Michigan Michigan City IN to St. Joseph MI 5 NM offshore to mid-line of lake.- Lake Michigan from Seul Choix Point to Rock Island Passage 5NM offshore to Mid Lake- Lake Michigan South of a line from Seul Choix Point to the Mackinac Bridge and North of a line from Charlevoix MI to South Fox Island 5NM offshore- Lake Michigan from Charlevoix to Point Betsie MI 5NM Offshore to mid lake- Lake Michigan from Point Betsie to Manistee MI 5NM offshore to Mid Lake- Lake Michigan from Rock Island Passage to Sturgeon Bay WI 5NM offshore to mid lake- Lake Michigan from Sturgeon Bay to Two Rivers WI 5NM offshore to Mid Lake- Lake Michigan from Two Rivers to Sheboygan WI 5NM offshore to Mid Lake- Lake Michigan from Sheboygan to Port Washington WI 5NM offshore to Mid Lake- Lake Michigan from Port Washington to North Point Light WI 5NM offshore to Mid Lake- Lake Michigan from North Point Light to Wind Point WI 5NM offshore to Mid Lake- Lake Michigan from Wind Point WI to Winthrop Harbor IL 5NM offshore to Mid Lake- Lake Michigan from Winthrop Harbor to Wilmette Harbor IL 5NM offshore to Mid Lake- Lake Michigan from Wilmette Harbor to Michigan City in 5NM offshore to Mid Lake- 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- Lake Michigan from Holland to Grand Haven MI 5NM offshore to Mid Lake- Lake Michigan from South Haven to Holland MI 5NM offshore to Mid lake- Lake Michigan from St Joseph to South Haven MI 5NM offshore to Mid Lake- 623 AM CDT Mon May 18 2026 This Hazardous Weather Outlook is for the open waters of Lake Michigan. .DAY ONE...Today and Tonight Areas of fog, possibly dense will continue over the northern half of the lake. Breezy south winds will develop, while scattered thunderstorms are also expected. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday Breezy south winds and chances of thunderstorms continue into Tuesday. $$ www.weather.gov/mkx  524 FLUS43 KBIS 181136 HWOBIS Hazardous Weather Outlook National Weather Service Bismarck ND 636 AM CDT Mon May 18 2026 NDZ004-005-012-013-017>020-022-023-025-031>033-035>037-040>044- 046>048-050-051-057>062-191145- Bottineau-Rolette-McHenry-Pierce-McKenzie-Dunn-Mercer-Oliver- Sheridan-Wells-Foster-Golden Valley-Billings-Stark-Burleigh- Kidder-Stutsman-Slope-Hettinger-Grant-Bowman-Adams-Emmons-Logan- La Moure-McIntosh-Dickey-Western McLean-Eastern McLean- Western Morton-Eastern Morton-Western Sioux-Eastern Sioux- 636 AM CDT Mon May 18 2026 /536 AM MDT Mon May 18 2026/ This Hazardous Weather Outlook is for portions of north central North Dakota, northwest North Dakota, south central North Dakota, southeast North Dakota, and southwest North Dakota. .DAY ONE...Today and Tonight The probability for widespread hazardous weather is low. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday Near or below freezing temperatures are possible Tuesday morning and again Tuesday night into Wednesday morning. .SPOTTER INFORMATION STATEMENT... Spotters are asked to provide reports to the NWS using standard procedures, including through our social media accounts. $$ NDZ001>003-009-010-055-056-191145- Divide-Burke-Renville-Williams-Mountrail-Northwest Ward- Central and Southern Ward/Minot Area- 636 AM CDT Mon May 18 2026 This Hazardous Weather Outlook is for portions of north central North Dakota and northwest North Dakota. .DAY ONE...Today and Tonight Patchy to areas of dense fog possible this morning across northwest and north central North Dakota. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday Near or below freezing temperatures are possible Tuesday morning and again Tuesday night into Wednesday morning. .SPOTTER INFORMATION STATEMENT... Spotters are asked to provide reports to the NWS using standard procedures, including through our social media accounts. $$