Area Forecast Discussion
Issued by NWS Omaha/Valley, NE

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524 FXUS63 KOAX 212300 AFDOAX Area Forecast Discussion National Weather Service Omaha/Valley NE 600 PM CDT Wed Mar 21 2018 .SHORT TERM...(Tonight through Saturday) Issued at 328 PM CDT Wed Mar 21 2018 WV imagery this aftn showing a large upper level circulation centered over the southeastern state continuing to migrate to the east. Meanwhile a low amplitude ridge prevailed across the western half of the CONUS along with a developing system situated off the Pacific NW. At the sfc, broad high pressure was in control across the central CONUS. Topic of interest is possible precip event coming this weekend. Thursday evening, shortwave energy is progged to move ashore over southern CA and push into the central Rockies by 12z Friday then into the Dakotas Friday afternoon. Increasing DPVA associated with this wave induces leeside sfc cyclogenesis in eastern KS with increasing boundary layer moisture advection into the central Plains ensuing. Initial precip development late Thursday night is progged to occur over the Dakotas, where brunt of synoptic scale forcing will reside at that time, before expansing Southward into the CWA as the surface low scoots across KS. Expect activity to continue into Friday night/Saturday morning as the wave exits the Dakotas and pushes past the mid MS vly. Both NAM/GFS advertise PWS values topping out around an inch...and given the track of the wave, suspect that decent rainfall amounts may be realized over the eastern CWA. Also, elevated instability will likely allow for a few rumbles of thunder to be heard mainly over the southern CWA. .LONG TERM...(Saturday night through Wednesday) Issued at 328 PM CDT Wed Mar 21 2018 Precip chances increase early next week in response to prolonged period of isentropic upglide. Sunday through Tuesday...nocturnal precip over the northern CWA may consist of a rain/snow mix at times. Otherwise, weak elevated instability may lead to a few rumbles of thunder along/south of I-80 Monday afternoon/evening. && .AVIATION...
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(For the 00Z TAFS through 00Z Thursday evening) Issued at 600 PM CDT Wed Mar 21 2018 Mid level clouds will increase this evening and linger into Thursday morning. Spotty light precipitation possible, but it should be isolated enough to not include in TAFs at this time. Look for VFR conditions through the period with south or southeast winds.
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&& .OAX WATCHES/WARNINGS/ADVISORIES... NE...None. IA...None. && $$ SHORT TERM...DEE LONG TERM...DEE AVIATION...Miller is the U.S. government's official web portal to all federal, state and local government web resources and services.