We continue to keep a close eye on the forecast as it will be taking a turn for the worse tonight. This system will come in 3 different phases. Phase one will begin here in the next few hours across northern Iowa.Snow will begin to work into northwest Iowa by early this evening, mainly after 7pm, and will spread to the southeast. Only expecting the snow across the northeast half of the state, or a line from Denison to Des Moines back to Ottumwa and to the northeast. The heaviest of the snow will fall from Mason City, to Waterloo, and on down to Davenport. We are only expecting 2 to 3 inches in this area with locally higher amounts possible. Lesser amounts are expected further to the south. This snow will be very light and fluffy causing it to be blown around very easily.
After this band of snow pushes out tomorrow morning, a strong arctic cold front will move through the state tomorrow afternoon bringing another shot of snow and very gusty winds. This will be phase two. This second round of snow will be light as we are only expecting another inch or so across northeast Iowa.
A BLIZZARD WARNING has now been issued from 9am to midnight Sunday across northern Iowa and from noon to midnight Sunday for central Iowa. Blizzard conditions will develop by late Sunday morning, then persists through Sunday evening. The worst conditions are expected from around noon through 9pm Sunday. Widespread whiteout conditions will occur due to the strong northwest wind gusting up to 55mph.
A WINTER WEATHER ADVISORY is now in effect from 9pm this evening to noon Sunday for northeast Iowa due to the snow expected this evening. Once the snow has stopped falling, winds will kick up and cause white out conditions. This is why a winter storm warning has also put into effect for tomorrow.
A WINTER STORM WARNING has been issued for much of eastern Iowa. This goes into effect at noon on Sunday and will last through midnight Sunday. The heaviest snow will occur between 11pm and 4am. Snow totals of 3 to 5 inches are expected. The snow will make roads slippery and reduce visibilities late this evening and overnight. The visibility could be reduced to less than a mile at times. White outs with near blizzard conditions will occur Sunday afternoon and evening as northwest winds of 25 to 35mph with gusts of 45 to 50mph blow and drift the snow.
A HIGH WIND WARNING has now been issued as well. This warning goes into effect at 3pm Sunday and will go through midnight Sunday. Winds will be picking up Sunday mid afternoon and evening. West to northwest winds of 30 to 40 mph gusting to 60mph will be likely in this warning. Areas in southern Iowa that are not expecting as gusty of winds are in a WIND ADVISORY. This advisory goes into effect at 6pm Sunday and will last through midnight Sunday. Winds of 25 to 40mph with gusts up to 50mph are likely.
If you have plans tomorrow, I can not stress enough to be looking at making back up plans as travel will not be advised tomorrow afternoon across the northeast half of the state. Visibilities will be below a quarter of a mile as winds will be gusting up to 55mph. Phase 3 is behind the front. Behind the cold front, temperatures will plummet and wind chills will be -25°F to -45°F by Monday morning. This is why across southeast Iowa a WIND CHILL ADVISORY is in effect from midnight Sunday, through noon on Monday, and across northeast Iowa, a WIND CHILL WATCH is in effect from late Sunday night through Tuesday morning. We will continue to keep track of the very latest and will bring you the very latest updates on our Facebook page and right here at Iowachase.com.