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10 avr. 2019 | 07h53 UTC

US: Blizzard warning issued for Plains, Colorado April 10-11 /update 4

United States of America Alerte de sécurité

US National Weather Service issues blizzard warning for northern Plains, including Colorado, for April 10-11; flight disruptions and dangerous driving conditions expected

TIMEFRAME expected from 9/4/2019, 12h00 until 12/4/2019, 11h59 (America/Chicago). COUNTRY/REGION Wyoming, Nebraska, South Dakota, Minnesota, Colorado, Iowa, Wisconsin, Denver International Airport (DEN), Minneapolis-St. Paul International Airport (MSP)

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The US National Weather Service (NWS) issued a blizzard warning on Tuesday, April 9, effective for the northern Plains from midday or evening (local time) on Wednesday, April 10, to Thursday evening, April 11. A second "bomb cyclone" is expected to bring dangerous winter storm conditions to areas from the Colorado Rockies to northern Wisconsin, covering central and eastern Colorado (including Denver) eastern Wyoming, Nebraska, northwestern Kansas, South Dakota, northern Iowa, and Minnesota (including Minneapolis and St. Paul).

Heavy snowfall ranging from 10-20 cm (4-8 in) in eastern Colorado to 30-50 cm (12-20 in) in Minnesota is possible throughout the region. Wind gusts of up to 100 kph (60 mph) are also forecast and may result in blowing snow and extremely limited visibility. Transportation disruptions are likely, including flight delays and cancelations as well as dangerous driving conditions and road closures. Residual flight delays may continue through the end of the week. The large amount of precipitation may also exacerbate flooding in the Plains and Midwest. Flood warnings are already in effect for some tributaries of the Missouri and upper Mississippi rivers.


A "bomb cyclone" hit the Midwest and northern Plains in mid-March, causing massive flooding in the Missouri River basin. A bomb cyclone is a rapid drop in air pressure of at least 24 millibars in 24 hours, typically occurring over the ocean.


Individuals in the affected areas are advised to monitor local weather reports, prepare for winter weather, anticipate transportation disruptions, including flight delays and adverse driving conditions, power outages, and possible flooding. Remember that driving through running water can be dangerous - 15 cm (6 in) is enough to knock over an adult - and that floodwater may contain wastewater and chemical products; all items having come into contact with floodwater should be disinfected and all foodstuffs discarded.


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