Time and Day:
0700 Tuesday 3/20 SPRING
The Snapshot:
The first day of spring will be sunny,
warm and dry. Mixed rain and snow enter
the scene on Thursday with snow showers expected through the weekend.
The Science
A word about the Vernal Equinox
Vernal is the Latin work for spring and equinox literally means "equal night." Everywhere on earth will experience approximately 12 hours of daylight and 12 hours of night. There are only two times a year when the
sun shines directly at the equator and the tilt of the Earth’s axis
is perpendicular to the sun’s rays; Today and September 21st.
Current Observations:
The clouds cleared out overnight
with clear conditions being reported.
The temperature profile is 28base / 24ridge. The barometer has dropped a notch to 1015mb’s.
The winds are blowing 5-10mph and out of the west.
The Forecast: A
fairly stable atmosphere will produce mostly clear weather for the next
24hrs. Clouds and moisture roll in
tomorrow as a low pressure system developing in the Gulf of Alaska begins to
track SSE. Light mixed rain and snow
will begin late tomorrow night or early Thursday morning with an intermittent
showery pattern expected on Thursday. A
cold front will swing in late Thursday, dropping the freezing levels and switching
the rain to snow.
The Long Range: Intermittent snow showers will
persist through the weekend with more active weather expected early next
week.
24hr values daily 4am to 4am.
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Precipitation:
Today 24hr
water: 0 snow: 0
Tomorrow’s 24hr
water: .10 snow: 0
Trend and Timing:
Dry today with light rain expected to
arrive late tomorrow night.
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Temperature:
Low: 26 High:40
Freezing level: +-4500’
Trend and Timing:
Freezing levels will remain around
4500’ with typical daytime warming.
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Winds
Base: 0-5 W
Ridge Top: 5-10 W
Trend and Timing:
Westerly flow will be the wind pattern
today. The flow switches easterly tomorrow.
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