Archive for the ‘Severe Weather Advisory’ Category

Worldwide All Hazards Briefing for 1 February 2019, 11:00 am EST / 16:00 GMT

Monday, September 22nd, 2014

World Synopsis – A major storm system will plow through California. Stormy weather for parts of Europe.


Tropical Severe Weather –

There are no threatening storms at this time.


North America Severe Weather


US / Canada Synopsis: The life-threatening Arctic air that gripped much of the central and eastern states the last several days will exit the Northeast Friday. In the West, the first of two large storms will move over the coast later Friday followed by a second storm Monday. Heavy rain, strong winds and heavy mountain snow will impact much of California through this weekend, with flooding possible near burn scars.

NWS Watch Warning Advisory Hazards KMZ requires Google Earth or like KMZ reader.




California A major storm will hit California during the first days of February: Winter Storm Warnings & Watches are in effect for the Sierras and western Nevada and for the mountains of Ventura and Los Angeles counties excluding the Santa Monica range from late this evening through early Sunday evening.

A Flash Flood Watch is in effect A portion of western California, including the following locations: The entire San Francisco Bay Area, the Central Coast, and for Ventura and Los Angeles Counties. Also for a portion of central California, including the following areas, Mariposa, Madera, and Fresno County Foothills, Sierra Nevada from Yosemite to Kings Canyon, Tulare County Foothills, and Tulare County Mountains.




Discussion – Heightening the risk of flash flooding, mudslides and dangerous travel in the mountains. This will be the first major storm to hit the area since the middle of January. Wet weather dampen ed the Bay Area early Thursday before sweeping down the coastline to Los Angeles and San Diego as the day progresses. Many areas of Southern California received between 0.5 and 1.0 inches of rainfall. However, a new storm projected to arrive late Friday is expected to pack a bigger punch over a broader area.

Moderate to heavy rain and mountain snow will return to most of the state Friday through Saturday. This second storm will be stronger and will bring a heightened chance of flash flooding, mudslides and debris flows. People living downhill of burn-scar areas should make sure they are up to date with the latest weather alerts for their location and heed any evacuation orders from local officials. Having an emergency go-bag at the ready can save valuable minutes in the event of an evacuation.

A general 1-3 inches of rain is expected to fall in most of the state, with locally higher amounts of up to 5 inches possible.

Gusty winds whipping in with the storm will make it difficult for pedestrians to keep umbrellas upright in San Francisco, Los Angeles and San Diego. Localized tree and power line damage may also result, especially where the ground remains soggy from Thursday’s storm.

Motorists can anticipate further reductions in visibility and slowdowns on the roadways, including interstates 5, 10, 15, 40 and 80. Road closures are possible due to flash flooding and mudslides.

Turn around and find a safer, alternate route if a roadway is covered with high water or debris.

Airline passengers traveling into or out of San Francisco and San Diego can also anticipate disruptions.

Rain will reach the deserts of the Southwest, including Las Vegas and Phoenix, on Saturday and Saturday night.

Winter Storm Warnings are in effect for the entire Sierra Nevada mountain range as severe disruptions to travel are expected over the high terrain of the Sierra Nevada, where snowfall will be measured in feet. This includes I-80’s Donner Pass, where closures are possible during the height of the storm from Friday night through Saturday. Snow levels will drop to around 4,500 feet across the mountains of Southern California as precipitation winds down late Saturday.

Winter Storm Warnings are in effect for the So. Cal mountains as a mix of rain and snow or a brief change to wet snow is possible over the Grapevine at the tail end of the storm. Showery weather can linger across the state from Sunday into Monday, before drier weather returns by the middle of next week.


MontanaWinter Storm Watches are in effect for this weekend across much of Montana as a system drops down from Canada ushering in heavy snow of over a foot in many mountains areas and gusty winds. Travel could be very difficult at times.


Ohio Valley to Mid-Atlantic – Winter Storm Warnings are in effect for parts of south eastern Ohio, extending to northern West Virginia and far western Maryland as a quick hitting storm will bring several inches of snowfall to the region through tonight. Plan on difficult travel conditions in the warned areas.


Canada – B.C.: Winter Storm Warnings are in effect for central and eastern B.C as A long duration snowstorm is forecast. a slow moving frontal system will spread snow and strong winds across the B.C. central and northern interior. This long duration snowstorm will produce 30 to 40 cm of snow by Saturday morning. Areas near and along Highway 16 east of Prince George towards McBride and Highway 97 north of Prince George, and those near Tumbler Ridge will see near 50 cm by Saturday morning. As the frontal system collides with an advancing Arctic cold front late today and tonight, strong winds will develop over parts of the northern interior generating poor visibilities in blowing snow. Snow will abate on Saturday as dry Arctic air settles in.

Rapidly accumulating snow will make travel difficult. Visibility may be suddenly reduced at times in heavy snow. Poor weather conditions may contribute to transportation delays. If you must travel, keep others informed of your schedule and destination and carry an emergency kit and mobile phone.

Alberta – Heavy Snow: A slow moving frontal system will continue to maintain a band of heavy snow across central Alberta into the weekend. This long duration snowstorm is expected to produce total accumulations of 15 to 40 cm by Saturday evening. Parts of the ice fields parkway highway 93 may see accumulations in excess of 50 cm. Due to the banded structure of the heaviest snow, total accumulations may not be uniform across all regions.

Saskatchewan – Heavy Snow: A long period of snowfall with total amounts of 10 to 20 cm is expected. Portions of central Saskatchewan will receive 10 to 20 cm of snow as a slow-moving disturbance crosses through the province on Friday and Saturday. Snow will spread across central Saskatchewan on Friday and taper off from west to east through the day on Saturday. The heaviest snowfall will occur on Friday evening into Saturday. Details on the exact timing and amounts expected for the various communities included within the snowfall warning can be found in the local forecasts Visibility may be suddenly reduced at times in heavy snow. Surfaces such as highways, roads, walkways and parking lots may become difficult to navigate due to accumulating snow.


Newfoundland – Southern Coastal region to the Avalon Peninsula: Snow squalls are expected. Under the snow squall bands, visibilities will be significantly reduced due to the heavy snow combined with blowing snow, and snow will quickly accumulate. Snow squalls today and this evening.

Snow squalls are producing at times whiteout conditions. Additional local snowfall accumulations of up to 15 cm are possible under the most intense snow squalls. Conditions are expected to improve during the evening as squalls taper off to flurries.

Snow squalls cause weather conditions to vary considerably; changes from clear skies to heavy snow within just a few kilometres are common. Visibility will be suddenly reduced to near zero at times in heavy snow and blowing snow.


International Severe Weather


Caribbean / Central / South America Peru – Strong thunderstorms are erupting over northern Peru. Expect flash flooding.

EMEAFor Europe, today through Saturday While Storm Gabriel brought wind, rain and snow to parts western Europe from Tuesday into Wednesday, and another storm is currently moving through western Europe. Milder air accompanying this storm will limit snowfall to areas from far northeastern France into Belgium, the Netherlands and western Germany. A period of snow from late Thursday afternoon into Thursday night will bring a coating to 2 cm (1 inch) of accumulation to Brussels, Amsterdam, Luxembourg and Cologne, resulting in some travel disruptions.

The snow will change to rain from west to east as milder air arrives Thursday night into Friday.

Milder air across the rest of France, Spain and Portugal will result in mainly rainfall for these areas, with the exception being the highest elevations of northern Spain and the Pyrenees, where snow is expected. Rain will fall throughout much of France, Portugal and Spain on Thursday, with the heaviest amounts expected in northern Portugal, northwestern Spain and southwestern France.

Along with the rain, frequent wind gusts of 30-50 km/h (19-31 mph) are expected on Thursday before increasing to 65-80 km/h (40-50 mph) at times across Spain and Portugal on Thursday night and Friday.

Rain will continue to fall throughout the region from Thursday night into Friday. There may even be a few rumbles of thunder across northern Spain and western and northern parts of France on Friday.

While flooding is not expected to be a widespread concern, 24-48 hours of moderate to heavy rain in northwestern Spain can result in localized flooding. Flooding will also be a localized concern across southeastern France, where rain will combine with melting snow from areas around the French Alps.

The higher elevations of the French Alps as well as northern Italy can expect 30-60 cm (12-24 inches) of snow through Friday night; however, anyone planning to ski or hike in the mountains should be aware of the continued high risk for avalanches.

Enough cold air will remain in place that snow will also fall outside of the mountain in northwestern Italy with lasting accumulations expected in Milan. Total snowfall of 2-8 cm (1-3 inches) is expected in the city and surrounding areas.

Lingering rainfall is expected across northern Spain and western France on Saturday, while additional snow falls in the Alps of southeastern France and northern Italy. A period of more tranquil weather is possible across western Europe next week as high pressure settles over the region.


Central Africa – Moisture streaming in from the Indian Ocean is also fueling moderate to heavy rains to Angola and as far north the Central African Republic. Much of Madagascar is also experience heavy rains. Anticipate flash flooding and transportation disruptions.


Asia / Pacific RimIndonesia – Moderate to heavy rains will return Borneo, Java to Sumatra.  Expect flash flooding.


Australia – Queensland – Record-setting rainfall in recent days has led to widespread flooding, land slips, road closures and evacuations across Queensland. Flood dangers and travel disruptions are expected to continue with little change expected in the coming week.

Across parts of northern Queensland, Cairns recorded a daily rainfall of 277 mm (10.91 inches). This is the most rain the city has had in a single day in more than a decade. North of Cairns, the Daintree River reached an all-time record height last weekend with a peak of 12.6 meters (41.3 feet) on Saturday night, according to The Guardian.

The Commonwealth and Queensland governments are working to support recovery efforts throughout the region.

Infrared image courtesy of the Japan Meteorological Agency. Blue Marble surface image courtesy of NASA.

“As well as breaking records for a region no stranger to wet seasons, the floodwaters have cut roads and power, damaged infrastructure such as water and sewerage lines, and isolated vulnerable communities,” Queensland Premier Annastacia Palaszczuk said.

Authorities are reportedly going door-to-door checking on residents in communities just north of Townsville, where the Bluewater Creek has overflowed its banks and has flooded homes, businesses and roads. In Townsville, evacuations were ordered on Thursday from residential buildings made unstable by rushing water and land slips.

Schools, daycare centers and businesses have been closed throughout the region, and hundreds of properties are currently without power.

According to The Australian, the state environment department is closely monitoring the state of a dam on the site of Clive Palmer’s Yabulu nickel refinery. It is currently not in danger of overflowing or breaking.

Unfortunately for residents and businesses in these areas, the rainy conditions are expected to continue for the foreseeable future. The monsoon trough responsible for this weather looks like it will continue to inundate the east coast for potentially another one to two weeks. Combined with a surface low farther west, flooding rainfall can occur farther inland as well.

Periods of heavy rain are therefore expected to continue through the weekend and at least the middle of the coming week. Gusty thunderstorms are also possible, which could lead to toppled trees and increased power outages.

Another 150-300 mm (6-12 inches) are possible, with local amounts of 600 mm (24 inches) next week.

Residents should stay up to date on local weather warnings and take heed of evacuation notices. Many creeks and rivers in the region have already exceeded record flood stages and are only expected to rise further in the coming days.


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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