Comments on: Unsettled Northwest, Showers along cold front for Eastern States http://www.4cast4you.com/unsettled-northwest-showers-along-cold-front-for-eastern-states/ Tomorrow's Weather Today Sun, 20 May 2012 08:54:35 +0000 http://wordpress.org/?v=2.7.1 hourly 1 By: Joe Roy http://www.4cast4you.com/unsettled-northwest-showers-along-cold-front-for-eastern-states/comment-page-1/#comment-21 Joe Roy Sun, 22 Mar 2009 16:49:17 +0000 http://www.4cast4you.com/?p=751#comment-21 Anafrontal precipitation takes place when a front advances faster than the flow in which it is embedded. The front advances due to wave propagation, and the flow responds accordingly. Warm air flows up the face of the frontal surface, which is typically not as steep as in a katafront (more often the case with cold fronts). The omega value are not as high (negative that is) and occurs over a larger surface area, generating an expanded precipitation shield. If memory serves me right, I dont believe the temperature contrast was that great along that front, good CAA followed pretty far behind it. If anything, in springtime when you see cold front's with sharp horizontal temp gradients, their normally accompanied by squal lines and drier air right behind them. Joe Anafrontal precipitation takes place when a front advances faster than the flow in which it is embedded. The front advances due to wave propagation, and the flow responds accordingly. Warm air flows up the face of the frontal surface, which is typically not as steep as in a katafront (more often the case with cold fronts). The omega value are not as high (negative that is) and occurs over a larger surface area, generating an expanded precipitation shield.

If memory serves me right, I dont believe the temperature contrast was that great along that front, good CAA followed pretty far behind it. If anything, in springtime when you see cold front’s with sharp horizontal temp gradients, their normally accompanied by squal lines and drier air right behind them.

Joe

]]> By: Vincent Sapone http://www.4cast4you.com/unsettled-northwest-showers-along-cold-front-for-eastern-states/comment-page-1/#comment-20 Vincent Sapone Sun, 22 Mar 2009 12:36:58 +0000 http://www.4cast4you.com/?p=751#comment-20 I was actually wondering why the showers and clouds were so far behind the cold front! I know that you can get some light instability behind a cold front certain times of the year and the occasional cumulus clouds and posibly a bit of precip. Do anafronts require higher temperature contrasts between the air masses to achieve stronger vertical development in the warm column? Vinnie I was actually wondering why the showers and clouds were so far behind the cold front! I know that you can get some light instability behind a cold front certain times of the year and the occasional cumulus clouds and posibly a bit of precip.

Do anafronts require higher temperature contrasts between the air masses to achieve stronger vertical development in the warm column?

Vinnie

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