Topic: Spring 2013 Cold Air Mass Movement Projections

[richard583]

With continuing to recede daily more northward over-all, beginning on the 31st of May or so main colder air looked at across the board within the main mid-latitudes, should start to move at a more stepped up pace more eastward through to the 7th or 8th of June. 

[richard583]

On the 8th of June or so, main colder air mass—if in places amounting to only more moderating "cooler air"—should begin to move and spread daily more southward, through until just after the summer solstice.

This with its being caused to move increasingly more directly south from the 8th through the 17th of June or so, with its at the same time gradually more slowed movement and pace more eastward.


No "Numerical Wx-forecast Models" have been consulted, where considering the generation of the general outlook included above as part of this post.

[richard583]

The heating trend has begun, as high pressure builds into our area. Main impacts for Wednesday and Thursday are hot temperatures in the Northern Sacramento Valley, a moderate Delta Breeze, and the possibility of thunderstorms over the Sierra crest. By Friday and Saturday, Northern California will be at the peak of this heat wave with widespread triple digit heat, near record levels. The hot and dry weather coupled with locally breezy North winds will bring fire weather concerns to the region. Temperatures are expected to return to near normal early next week.

[richard583]

Hmm (?!). .. "Toasty".


(click for larger image.)

(source: Unisys Weather)

[richard583]

Certainly working as such here in CA where I am, …

.. the initial 48 hours of "moderating" "cooler air" southward that I'd projected above, has resulted in a drop in main higher temps daily, of nearly 20°.

The greater shift in and of relatively more cold air more southward over the past two days (in fact more hemispheric), is shown fairly clearly where looking at the "gif-loop" accessible here just below covering much of N. Amer. and adjacent east and west.


(Click on this image, and allow time for this loop to load in.)

(source: Unisys Weather)

[richard583]

With from the 19th through to the 23rd of June or so main colder air's being caused to move more quickly east, its further spread south through to the 21st or 22nd should be less direct—with the main patterning of the Jet Stream shifting to increasingly more zonal.

[richard583]

As I'd inferred that I would back on the 4th of this month, with continuing to move and spread still more southward daily, main and broader cold has at this point begun to move more strongly (Or at a less, slowed pace.) east.

— Essentially more "zonally", and less "meridionally".

.. Again, broader cold's current main more general expansion south should continue through the 21st or 22nd.


No "Numerical Wx-forecast Models" have been consulted where considering the generation of the general outlook included above as part of this post.

[richard583]

At this point, main colder air's stronger movement east has largely superseded its spread south.


My initial projection for the main summer season focusing on main "cooler" air broader movement from this point forward. http://www.wxforum.net/index.php?topic=19265.0#new

—> Twitter posts

[richard583]

All cooler and more moderating air should begin to retreat now at this point more. This, steadily more daily through to July 5th, when a next broader wave and delivery or relatively more cool air begins to move and spread south.

This, if with this more general scenario some cooler air's still making it more southward from now through the 29th with its slower movement east and where finding more conducive avenues to do so.