[NAFEX] Freeze or Frost?

Hal Love lovehd at comcast.net
Tue May 12 11:50:46 EDT 2009


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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