[NAFEX] Freeze or Frost?

Kevin Moore aleguy33 at yahoo.com
Tue May 12 13:02:20 EDT 2009


I believe you are correct. I guess it's not much of an issue here because it is always so humid. Though the frosts we do get are usually only on cars and such. We rarely ever see any frost crystals on plants. I don't know why that is, radiative cooling?




________________________________
From: Hal Love <lovehd at comcast.net>
To: North American Fruit Explorers <nafex at lists.ibiblio.org>
Sent: Tuesday, May 12, 2009 10:50:46 AM
Subject: Re: [NAFEX] Freeze or Frost?

 
I believe frost is only when you actually get ice 
crystals forming on surfaces, which depends on the dew point. No matter how cold 
it gets, if the temp is well above the dew point, you don't get frost. And you 
can get frost well above freezing if you reach the dew point, along with 
radiative cooling of surfaces on clear calm nights. 
 
Hal
----- Original Message ----- 
From: Kevin Moore 
To: North American Fruit Explorers 
Sent: Tuesday, May 12, 2009 6:53 AM
Subject: Re: [NAFEX] Freeze or  Frost?

My understanding is that a frost is anything 32 down to 30, a hard freeze  is anything below 28. This may vary according to what you are measuring the  temperature for. Plants, or water pipes, or . . . The effects of such weather  can vary considerably by elevation and whether you have anything uphill to  divert the cold air around you. (microclimate) If you're in bottom land,  there's not much you can do to alleviate this sort of event except to turn  your sprinklers on.




________________________________
 From: Steve  <sdw12986 at aol.com>
To: NAFEx <nafex at lists.ibiblio.org>
Sent: Monday, May 11, 2009 11:13:45  PM
Subject: [NAFEX] Freeze or  Frost?

    
Well, the apricots are in full  bloom, the plums are about half way done 
opening their flowers, the pear  trees are about to bloom and the apples 
are still pretty tight.

The  National Weather Service forecast is for a low of 23 tonight with 
"Patchy  Frost". The weather channel was predicting a hard freeze with a 
low of 30.  (I see they are now saying 26 degrees.)

Mostly I'm just complaining  about the weather but my question is, how 
can the NWS call 23 degrees  "Patchy Frost"? Wouldn't that be a pretty 
widespread frost at that  temperature? Wouldn't it actually be a hard freeze?

Steve in the  Adirondacks

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