Area Forecast Discussion
Issued by NWS Omaha/Valley, NE

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778 FXUS63 KOAX 221735 AFDOAX Area Forecast Discussion National Weather Service Omaha/Valley NE 1135 AM CST Wed Feb 22 2017 .SHORT TERM...(today through Friday) Issued at 305 AM CST Wed Feb 22 2017 Sharp transition from spring-like conditions at the start of the period to significant winter weather by Friday. Mild air was still in place across the area early this morning with temperatures at 08Z in the 40s and 50s. Temperatures today will again be well above normal with another day of record or near record highs for the south half of the area. Although northern areas will still be on the mild side, a cold front will move through eastern Nebraska and southwest Iowa during the day with cooler air spreading south behind the front. A pool of colder air will be poised to the north across the northern plains and will drop south tonight on the back side of an upper trough moving into the Great Lakes region. The leading edge of the colder air will reach northern Nebraska by Thursday morning. Clouds will be increasing during the day along with the chance of precipitation as a late winter storm system begins to organize over the western high plains. A strong baroclinic zone will develop near the southern Nebraska border by Thursday afternoon as surface low pressure deepens over northwest Kansas. North of this boundary rain will become widespread across the area during the day Thursday with a mix of rain and snow initially in parts of northeast Nebraska. There will also be a chance of thunderstorms in southeast Nebraska and southwest Iowa early Thursday evening. Strong vertical motion fields resulting from isentropic lift and the approaching upper wave will result in moderate to heavy snow possible at times across parts of northeast Nebraska Thursday night into Friday. A winter storm watch has been issued for the northern two tiers of counties for this time period where there will be the potential for up to a foot of snow along with strong north to northwest winds. Snow will spread south and east during the day on Friday with a mix of rain and snow expected for much of southeast Nebraska and southwest Iowa before changing to all snow during the late afternoon with light snow extending into Friday evening. Snowfall across the south half of the area is expected to range from less than an inch up to 4 inches by late Friday night. .LONG TERM...(Friday night through Tuesday) Issued at 305 AM CST Wed Feb 22 2017 Colder temperatures will be around for the weekend behind the departing winter storm with snow covered areas seeing the coldest temperatures. Warming trend returns for the early part of next week with snow free areas in the south likely approaching 60 degrees by Tuesday. && .AVIATION...(For the 18Z TAFS through 18Z Thursday afternoon) Issued at 1111 AM CST Wed Feb 22 2017 Deteriorating conditions are expected at all terminals late tonight with the approach of a strong storm system moving into the central Plains. Increasing low level moisture will result in widespread MVFR cigs advancing southward out of SD and into nern Neb shortly after midnight...then expand over the rest of ern Neb Thursday morning. && .OAX WATCHES/WARNINGS/ADVISORIES... NE...Winter Storm Watch from Thursday evening through Friday afternoon for NEZ011-012-015>018. IA...None. && $$ SHORT TERM...Fobert LONG TERM...Fobert AVIATION...DEE is the U.S. government's official web portal to all federal, state and local government web resources and services.