Worldwide All Hazards Briefing for 16 April 2018, 10:20 am EDT / 14:20 GMT

World Synopsis – The major April winter storm moves out of the U.S. and into eastern Canada.


Tropical Severe Weather –


Tropical development is not expected.


North America Severe Weather


US / Canada Synopsis: Wintry precipitation and strong winds will continue to impact the Great Lakes and Northeast on Monday. Significant snow and freezing rain are expected in these areas. Heavy rain is also possible in parts of the Mid-Atlantic and southern New England on Monday, along with moderate coastal flooding. The storm will finally weaken late Monday.



Severe Thunderstorm Outlook: Widespread thunderstorms are not expected for the next several days.


For the Great Lakes, Ontario, and New England – Winter Storm Warnings  remain in effect for northern Lower Michigan and the eastern UP of Michigan as heavy snow will continue through the afternoon.

Over in New England, Winter Weather Advisories remain in effect for much of New Hampshire, Vermont, Maine for freezing rain which will make travel difficult through the afternoon.

Further south into the Mid-Atlantic region, flooding is an issue as heavy rains from early this morning have caused some minor flooding from Virginia to New York. Also western Upstate NY will also see some flooding.


Southern Minnesota & northern Iowa – A Winter Storm Watch is in effect for Tuesday as a fast Moving Winter Storm to Impact Iowa Late Tuesday Night Through Wednesday Evening With Heavy Snow, Wind and Freezing Rain. Strong low pressure will reach Iowa by early Wednesday morning spreading a frozen mixture of freezing rain, sleet and snow to northern Iowa. A rapid changeover to all snow will occur over the northwest and far north resulting in an area heavy snow as well as stronger winds Wednesday afternoon and evening. Travel is expected to become hazardous with snow and blowing snow and reduced visibility at times during the period. Some ice accumulation may result in hazardous travel between Highway 20 and Highway 3 as well.


Canada Northern Ontario – Winter Storm Warnings are in effect as a major winter storm is expected. A major winter storm is expected beginning today. A slow moving weather system approaching from southwest of the Great Lakes is expected to bring winter storm conditions today through Monday night. Snow is forecast to begin near the eastern shores of Lake Superior near noon today and then spread northeastward through tonight. Significant snowfall accumulations of 20 to 30 cm as well as brisk winds gusting up to 50 km/h will result in localized blowing snow and difficult travel conditions today through Monday.

Environment Canada will continue to closely monitor this situation and provide further updates as the storm evolves. Consider postponing non-essential travel until conditions improve. Surfaces such as highways, roads, walkways and parking lots may become difficult to navigate due to accumulating snow.


Southern Ontario – Freezing Rains turning to heavy rains: The freezing rains for central and eastern southern Ontario will change over to heavy rains with flooding as the main issue.


Quebec – Ice Storm: Anywhere from 5 to 20 millimetres of freezing precipitations are expected by this evening over Southern Quebec. Surfaces such as highways, roads, walkways and parking lots will become icy, slippery and hazardous. Be prepared to adjust your driving with changing road conditions. Ice build-up may cause tree branches to break.


New Brunswick – Ice Storm: Freezing rain is expected or occurring. An extended period of freezing rain is expected for many areas of New Brunswick. A low pressure system will slowly approach New Brunswick today bringing mixed precipitation. The precipitation will start as ice pellets, flurries or showers today and then change to freezing rain tonight and persist into Tuesday. The highest accumulations are expected over northern New Brunswick where up to 15 mm of freezing rain is possible. Surfaces such as highways, roads, walkways and parking lots may become icy and slippery. Take extra care when walking or driving in affected areas. Poor weather conditions may contribute to transportation delays.


Newfoundland – Potential for an extended period of freezing rain over Newfoundland Tuesday evening into Wednesday. Latest guidance indicates that freezing rain will develop over southwestern Newfoundland on Tuesday evening and spread northeastward through the night. An extended period of freezing rain is expected over many areas before temperatures rise above freezing and precipitation changes to rain on Wednesday. It is also likely that Western and Central Newfoundland will see the freezing rain mix with ice pellets for a few hours over the course of the event. The public is advised to monitor future forecasts as warnings may be issued as the event draws near and impacts become more certain.


International Severe Weather


Caribbean / Central / South AmericaWidespread severe weather is not expected.


EMEA – For Europe, today and Tuesday – Mostly quiet across Europe.


Asia / Pacific Rim –  Widespread severe weather is not expected for Monday.


U.S. State Department Travel Advisories for your intended destination. Click here for a complete list, or see the world at a glance on our color-coded map.


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