... November 28 2006 Winter Weather Event ...
This weather system provided many challenges right up until the event. Abundant moisture was present for the low pressure that tracked from
Wyoming into south-central
South Dakota into southeastern
North Dakota then into the
Minnesota arrowhead region. East of the low pressure system, thunderstorms moved from southern
Wisconsin , and on the backside of the low snow fell in the western/central
Dakotas . There was a report of thundersnow in
Pine River, Minnesota during the early morning hours on Tuesday. Once the low moved into western
Minnesota , snow fell in northeastern
North Dakota , with freezing rain falling in the Baudette and
Roseau areas where around one half inch of ice accumulated before temperatures rose above freezing later on Tuesday afternoon. The low track is shown below in Images section.
Snowfall accumulations ranged from 2-4 inches in far northeastern
North Dakota to 0.8 inches in
Grand Forks . Maximum temperatures were highly variable with the middle 50s in
Iowa Tuesday afternoon and -13F in
Cutbank, Montana . This large temperature and moisture contrast (Images below) (dewpoints of 55 in Iowa/southern Minnesota and -20 in north-central Montana) coupled with a strong upper-level disturbance provided the needed ingredients for a winter weather event.
If more phasing occurred between the upper and lower level systems, this storm could have been much worse given the very large temperature contrast associated with the low pressure area. When a system phases, both the upper and lower-level features act together to rapidly strengthen a storm. The end result would have been a significantly stronger storm with more extensive precipitation and stronger winds.