Warm, fog and frost facts.
This morning it is partly cloudy. High of 63F. Winds from the WNW at 5 to 10 mph.
Tonight it will be clear with an expected Low of 39F. Winds from the NNW at 5 to 10 mph.
The readings from my own weather instruments are:
The humidity is 88% with a Dew Point of 48ºF, Temp is 50.4ºF and the wind chill is 50.4ºF.
Our wind direction is West between 0.2 MPH and 1.0 MPH.
Our Barometric pressure is 29.99 HPA 1014 and falling with a weather graphic indicating clouds.
There is no UV rating owing to the fog, Sunrise is at 6:21 a.m. sunset is 6:43 PM and Moon Rise is at 1:01 a.m. EDT and the moon phase is waning crescent.
For the pilots out there raw metar is:
METAR KAUG 181053Z AUTO 00000KT M1/4SM FG VV001 09/09 A2992 RMK AO2 SLP135 T00890089
Visibility is 0.2 miles/0.4 Kilometers with some thin clouds up there somewhere.
We received no rain here over the past 24 hours.
Tonight the temps will get into the 30's for the first time "post summer." So I post a refresher on frost from weather.com. Enjoy.
Interesting facts about Frost
Q: Can frost occur at temperatures above 32°F?
A: No, frost is defined as a layer of ice that forms on surfaces that are at or below 32°F. Sometimes frost can occur on your lawn overnight, even though your thermometer may never have dropped to the freezing mark. This is because cold air on clear, calm nights sinks to ground level. Temperatures at the ground can be lower than the temperature only a few feet higher where your thermometer may be located.
Since official weather measurements are taken in an instrument shelter four to five feet above the ground, frost can form even when the official temperature is above freezing.
Q: What is the frost line?
A: It's the average depth to which the ground freezes during the winter in a given area. Due to differences in winter temperatures from region to region, the frost line is deeper in colder climates, while the ground may not freeze at all in warmer locations. The frost line is important, particularly to builders. Building codes require that foundations be dug at least to the depth of the frost line. Failure to do so would compromise the structural integrity of the building as the ground shifts during the freezing process.
Q: Does frost form differently on different surfaces?
A: Yes. Frost forms faster on colder surfaces. Because of their composition and materials, your car or lawn will absorb less sunlight -- and therefore be colder -- than a driveway or wood deck. This is why you'll often see frost on your car and lawn as opposed to warmer surfaces such as pavement or wood.
Q. Does frost come out of the ground?
A. No, frost is caused when it is freezing cold and snowflakes fall then instantly freeze because of the cool tempreture.
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