Winter Weather Discussion for March 20-21, 2010.
*Significant winter storm in-progress*
– Winter Storm Warning for 69 counties in Oklahoma and a winter
weather advisory for the remaining eight.
– In the warned area, common snowfall amounts of 4-6 inches are
likely. In areas just north and east of Oklahoma City up to Tulsa a
snowfall maximum exceeding eight inches remains possible. In far
southern Oklahoma, where the advisory is posted, snowfall of 1-3
inches is possible.
– Strong winds continue to be a concern with this system, which will
cause blowing snow. Additionally, wind chill values will remain in
the teens through the afternoon hours.
– Limited ice accumulation did occur across parts of the state this
morning, so far there have been no reported impacts.
– Snow will start to tamper off in the panhandle/far western OK this
afternoon, the warnings may be dropped at that time. Snow is expected
to impact the state through late Sunday.
Cold front blasted through the state overnight and has now exited the
southeast corner. Only McCurtain county remains above 40F temperature
wise. The freezing line stretches from Ardmore to Miami this morning,
which is much farther east than originally thought. As such, a
quicker transition to snow has occurred in Oklahoma City, with sleet
in Tulsa. Recent model projections indicate that Tulsa should shift
to all snow by late morning. Temperatures continue to fall across
eastern Oklahoma as strong north winds bring in dry surface air.
Current RADAR shows snow across a large part of Oklahoma with the most
intense activity in east-central and northeast Oklahoma. An area of
somewhat calmer conditions is located over south-central Oklahoma with
little to no precipitation at this time. The snow will continue to
shift east with the 850mb low later today and start to make fill later
in central Oklahoma as the 500mb low closes off and moves eastward
along the Red River.
12z NAM continues prior projections regarding the upper system and
associated snowfall totals. There are no reasons to modify snow
accumulations at this time and will continue with a broad brush four
inch accumulations in the warning area with six inches near/north of
Oklahoma City; increasing in northern and eastern Oklahoma where
isolated amounts may exceed eight inches.
This message was sent using IMP, the Internet Messaging Program.