Sunny cool and some info about frost

Good morning Augusta.

This morning it is clear. High of 72F. Winds from the WSW at 5 to 10 mph.

Tonight it will be clear. Low of 46F. Winds less than 5 mph.

The readings from my own instruments are:

The humidity is 90% with a Dew Point of 45ºF and a wind chill of 46ºF.

The temperature Is 45.7ºF.

We have East Northeast winds between 1.0 mph and 4.0 mph.

Our Barometric pressure is 30.28 HPA 1025 and steady with a weather graphic indicating sun.  

We have a UV rating of 1 out of 16, sunset will be at 6:43 PM with Moon Rise at 6:03 p.m. and the moon phase is a full moon.

For the pilots out there, Raw Metar readings are:

METAR KAUG 181153Z AUTO 00000KT 10SM CLR 11/06 A3027 RMK AO2 SLP253 70003 T01110061 10111 20061 51004

Visibility is 10.0 miles/16.0 kilometers with a good clear ceiling.

We've had no rain here in the past 24 hours.

Since we've had the first two frost advisories for this fall, I thought some interesting facts about Frost would be appropriate.

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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