North American Fruit Explorers mailing list at ibiblio

[Kevin Moore <aleguy33@yahoo.com>]

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?

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From: Hal Love <lovehd@comcast.net>
To: North American Fruit Explorers <nafex@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.

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From: Steve <sdw12986@aol.com>
To: NAFEx <nafex@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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