Overcast with rain on the way - UV rating explained
Its going to rain a good bit of today so take your raincoat (A.K.A. slicker) and/or umbrella (A.K.A. bumbershoot) with you today.
This morning it is overcast with rain. Fog early. High of 70F. Winds from the ESE at 5 to 15 mph. Chance of rain 100% with rainfall amounts near 0.3 in. possible.
Tonight it will be overcast with a chance of a thunderstorm and rain showers, then rain showers after midnight. Fog overnight. Low of 59F. Winds from the East at 5 to 15
The readings from my own weather instruments are:
The humidity is 85% with a Dew Point of 59ºF and a temp of 64.4ºF.
Our wind direction is North between 0.4 MPH and 1.0 MPH.
Our Barometric pressure is 30.09 HPA 1017 and rising with a weather graphic indicating sun. This won't last the day.
The UV rating is 0 out of 16, Sunrise is at 5:39 a.m. sunset is 7:47 PM and Moon Rise is at 9:19 p.m. EDT and the moon phase is Waning Gibbous.
For the pilots out there raw metar is:
METAR KAUG 131053Z AUTO 13006KT 10SM OVC006 17/15 A3003 RMK AO2 SLP169 T01670150
Visibility is 10.0 miles/16.1 Kilometers with overcast to 600 ft / 182 m.
We received no rain here over the past 24 hours, but the rain is coming.
What does the UV rating mean?
Every day I post the UV rating on this blog, and I always do it in the morning, so the UV rating tends to be low all the time. But you need to know more about it if you want to understand what a UV rating is measuring.
So, direct from the web site for the Weather Channel:
The Weather Channel has developed a current and forecast ultraviolet (UV) index to help you prevent overexposure to the sun's rays. The following risk categories are used to identify the levels of skin-damaging UV radiation:
The UV index depends directly on the solar elevation above the horizon. On a daily basis the UV index will be higher around local solar noon (11:00 AM
to 1:00 PM) depending on the time zone. Clear sky days in the winter will have lower UV index values than clear sky days in the summer due to the higher solar angles in the summer.
0-2
Low
3-5
Moderate
6-7
High
8-10
Very High
10+
Extreme
Hourly UV Index
The hourly index monitors how observed hourly changes in the sky conditions impact the skin-damaging solar UV radiation. The hourly UV index factors in
cloud cover, visibility, and present weather conditions in addition to atmospheric ozone concentration, solar elevation and altitude above sea level.
Check the Current UV Index.
Forecast UV Outlook Index
The forecast UV index provides a UV forecast for the next ten days, based on the daily maximum UV index that is expected in a given location. The forecast
UV index depends on the following meteorological parameters as predicted by atmospheric models: forecast cloud cover and visibility, atmospheric ozone
concentration, solar elevation and altitude above sea level.
Check the UV Index Forecast.
Source: American Cancer Society
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