1/9/15: Quietly Cold

The cold front that pass across the region yesterday with the corresponding strong wind behind that front is now situated in the Ohio River Valley.  Although the wind has diminished from the speeds from yesterday, the wind is still very noticeable especially considering that temperatures are mainly in the single digits below zero this morning.  The core of the high pressure is working along the lee side of the Rocky Mountains will continue to place much of North Dakota is a moderealy tight pressure gradient meaning the wind will stay up today in the 10 to 20 mph range with some higher gusts, but that is no where near as strong as the wind was yesterday.

 

Surface Map 7:00 AM
Surface Map 7:00 AM

That extended area of high pressure will continue to work to the south in the next 24 hours, but at the same time another high pressure center that is in northwestern Canada will slide to the south to replace the current high pressure which means, no change in the next 48 hours, but once that next high moves across the area over the weekend, the surface flow will shift more westerly and a slow warm-up will commence.

The jetstream will be slowly transitioning from the current northerly flow to a more zonal flow as we progress through the next 10 days.

Current 250 mb Wind Speed and Direction
Current 250 mb Wind Speed and Direction

 

A power jet segment is expected to hit the west coast toward the end of next week.  That will in turn bring a more mild Pacific air to the upper Midwest during that time period, it may also set the stage for a snow storm, but that is a long ways into the future.

Projected JetStream for Saturday January 17, 2015
Projected JetStream for Saturday January 17, 2015

 

 

A dry period is foreseen for the next week (through next Thursday, January 15.  Temperatures cold through the weekend at similar levels to what is being recorded today.  A slow moderation of temperatures next week with a strong possibility of above average temperatures from January 15 to the 20th.

Daryl Ritchison