17 Mar 2014 PNW Migration Update

All systems were working against north bound migrants last night.  The low pressure system quickly moved through bringing quite a bit of rain and, more adversely, north winds on the back side of the low.

All adding up to a non-event.  It’s looking like tonight may be more of the same.  Probably without as much rain but the winds may continue out of the WNW putting a damper on large scale movement.

Here are the radar loops from last night.  I added KMAX (Medford) because it is quite illustrative.  We see the tail end of the Sat/Sun flight and then the beginning of last night’s flight being shut down by the approaching weather system.  Had the flight had the time to build to max density and then run into that storm it would have created classic “Fall Out” conditions.

17 Mar Base Reflectivity - Portland (KRTX)

17 Mar Base Velocity - Portland (KRTX)

17 Mar HC - Portland (KRTX)

17 Mar HC - Medford (KMAX)

Here is Paul’s archived National Radar Composite from last night.  Nice flight across the Florida Straights and partly up the state until they are met by a major system.  Maybe Badbirdz will put something up on that today.

Here are the weather maps: