Sunny with rain on the way and how rainbows are formed
Good morning Augusta.
Its going to rain today, take your umbrella with you when you leave the
house.
This morning it is overcast with a chance of rain, then thunderstorms and
rain showers in the afternoon. High of 72F. Winds from the SSE at 5 to 10
mph. Chance of rain 90% with rainfall amounts near 0.4 in. possible.
Tonight it will be overcast with rain showers, then thunderstorms and a
chance of rain after midnight. Low of 61F. Winds less than 5 mph. Chance of
rain 80%.
The readings from my own instruments are:
The humidity is 84% with a Dew Point of 60.2ºF and a wind chill of 65.2ºF.
The temperature is 65.2ºF.
We have no measurable winds speeds outside right now.
Our Barometric pressure is 29.77 HPA 1008.1 and falling with a weather
graphic indicating rain.
The UV rating is 1 out of 16, sunset will be at 7:47 PM with Moon Rise at
12:49 a.m. and the moon phase is waxing crescent.
For the pilots out there, Raw Metar readings are:
METAR KAUG 131053Z AUTO 00000KT 10SM CLR 15/14 A2987 RMK AO2 SLP113
T01500144
Visibility is 10.0 miles/16.1 kilometers with clear skies so far, but that
won't last.
We've hadno rain here in the past 24 hours, but remember your raincoat
today.
Speaking of rain, when it rains, and then stops, what causes a rainbow?
You know that light is made up of a collection of many colors: red, orange,
yellow, green, blue, indigo, violet. That is why a prism can take in white
light on one side and produce its own mini-rainbow on the other side. To
understand rainbows, you have to start by understanding what is happening
inside a prism to let it separate white light into its colors.
A prism is a triangular piece of glass or plastic. To get it to produce a
mini-rainbow, you allow a narrow strip of white light to fall on one face of
the triangle, like this: (Image not shown here)
The dispersion of colors in a prism occurs because of something called the
refractive index of the glass. Every material has a different refractive
index. When light enters a material (for example, when light traveling
through the air enters the glass of a prism), the difference in the
refractive index of air and glass causes the light to bend. The angle of
bending is different for different wavelengths of light. As the white light
moves through the two faces of the prism, the different colors bend
different amounts and in doing so spread out into a rainbow.
In a rainbow, raindrops in the air act as tiny prisms. Light enters the
raindrop, reflects off of the side of the drop and exits. In the process, it
is broken into a spectrum just like it is a triangular glass prism, like
this: (Image not shown here)
between the ray of light coming in and the ray coming out of the drops is 42
degrees for red and 40 degrees for violet. You can see in this diagram that
the angles cause different colors from different drops to reach your eye,
forming a circular rim of color in the sky -- a rainbow! In a double
rainbow, the second bow is produced because droplets can have two
reflections internally and get the same effect. The droplets have to be the
right size to get two reflections to work.
The next time you spot a rainbow, you will see it in a whole new light.
Downloaded in whole from: HowStuffWorks.com.
<http://science.howstuffworks.com/nature/climate-weather/atmospheric/questio
n41.htm>
Its going to rain today, take your umbrella with you when you leave the
house.
This morning it is overcast with a chance of rain, then thunderstorms and
rain showers in the afternoon. High of 72F. Winds from the SSE at 5 to 10
mph. Chance of rain 90% with rainfall amounts near 0.4 in. possible.
Tonight it will be overcast with rain showers, then thunderstorms and a
chance of rain after midnight. Low of 61F. Winds less than 5 mph. Chance of
rain 80%.
The readings from my own instruments are:
The humidity is 84% with a Dew Point of 60.2ºF and a wind chill of 65.2ºF.
The temperature is 65.2ºF.
We have no measurable winds speeds outside right now.
Our Barometric pressure is 29.77 HPA 1008.1 and falling with a weather
graphic indicating rain.
The UV rating is 1 out of 16, sunset will be at 7:47 PM with Moon Rise at
12:49 a.m. and the moon phase is waxing crescent.
For the pilots out there, Raw Metar readings are:
METAR KAUG 131053Z AUTO 00000KT 10SM CLR 15/14 A2987 RMK AO2 SLP113
T01500144
Visibility is 10.0 miles/16.1 kilometers with clear skies so far, but that
won't last.
We've hadno rain here in the past 24 hours, but remember your raincoat
today.
Speaking of rain, when it rains, and then stops, what causes a rainbow?
You know that light is made up of a collection of many colors: red, orange,
yellow, green, blue, indigo, violet. That is why a prism can take in white
light on one side and produce its own mini-rainbow on the other side. To
understand rainbows, you have to start by understanding what is happening
inside a prism to let it separate white light into its colors.
A prism is a triangular piece of glass or plastic. To get it to produce a
mini-rainbow, you allow a narrow strip of white light to fall on one face of
the triangle, like this: (Image not shown here)
The dispersion of colors in a prism occurs because of something called the
refractive index of the glass. Every material has a different refractive
index. When light enters a material (for example, when light traveling
through the air enters the glass of a prism), the difference in the
refractive index of air and glass causes the light to bend. The angle of
bending is different for different wavelengths of light. As the white light
moves through the two faces of the prism, the different colors bend
different amounts and in doing so spread out into a rainbow.
In a rainbow, raindrops in the air act as tiny prisms. Light enters the
raindrop, reflects off of the side of the drop and exits. In the process, it
is broken into a spectrum just like it is a triangular glass prism, like
this: (Image not shown here)
between the ray of light coming in and the ray coming out of the drops is 42
degrees for red and 40 degrees for violet. You can see in this diagram that
the angles cause different colors from different drops to reach your eye,
forming a circular rim of color in the sky -- a rainbow! In a double
rainbow, the second bow is produced because droplets can have two
reflections internally and get the same effect. The droplets have to be the
right size to get two reflections to work.
The next time you spot a rainbow, you will see it in a whole new light.
Downloaded in whole from: HowStuffWorks.com.
<http://science.howstuffworks.com/nature/climate-weather/atmospheric/questio
n41.htm>
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