Saturday, December 20, 2008

Another Winter Storm

We have just cleared our driveway again this morning. Yesterday the snowplows had our street turned into a one way. Last night they completed the job leaving a 2ft high by 3 ft wide snow bank at the end of our driveway. That is the worst part of keeping the driveway cleaned.
Glad we have a 8hp snow thrower.
We have another storm on the way tonight.
Local media forecasters indicate that snow will be moving in from the west Saturday night and picking up in intensity through Sunday morning.
Accumulations will range from 3-6 inches, with the highest amounts to the northwest of Grand Rapids. Another facet to this storm is the wind, which will really be whipping during the day on Sunday. Gusts will be in the range of 30 to 40 miles per hour and with falling snow, this could create extremely low visibilities. Expect near blizzard conditions at times Sunday with temperatures only in the teens. Wind chills will be much lower.
Information from the National weather service cautioned that temperatures will be bitterly cold as a strong cold front comes into the region carrying a blast of extremely cold arctic air. Wind chills could drop as low as 15 to 25 degrees below zero.
Gotta love winter in Michigan.
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HOW TO READ PROPAGATION NUMBERS

The A index [ LOW is GOOD ]

  • 1 to 6 is BEST
  • 7 to 9 is OK
  • 11 or more is BAD

Represents the overall geomagnetic condition of the ionosphere ("Ap" if averaged from the Kp-Index) (an average of the eight 3-hour K-Indices) ('A' referring to amplitude) over a given 24 hour period, ranging (linearly) typically from 1-100 but theoretically up to 400.

A lower A-Index generally suggests better propagation on the 10, 12, 15, 17, & 20 Meter Bands; a low & steady Ap-Index generally suggest good propagation on the 30, 40, 60, 80, & 160 Meter Bands.

SFI index [ HIGH is GOOD ]

  • 70 NOT GOOD
  • 80 GOOD
  • 90 BETTER
  • 100+ BEST

The measure of total radio emissions from the sun at 10.7cm (2800 MHz), on a scale of 60 (no sunspots) to 300, generally corresponding to the sunspot level, but being too low in energy to cause ionization, not related to the ionization level of the Ionosphere.

Higher Solar Flux generally suggests better propagation on the 10, 12, 15, 17, & 20 Meter Bands; Solar Flux rarely affects the 30, 40, 60, 80, & 160 Meter Bands.

K index [ LOW is GOOD ]

  • 0 or 1 is BEST
  • 2 is OK
  • 3 or more is BAD
  • 5 is VERY VERY BAD

The overall geomagnetic condition of the ionosphere ("Kp" if averaged over the planet) over the past 3 hours, measured by 13 magnetometers between 46 & 63 degrees of latitude, and ranging quasi-logarithmically from 0-9. Designed to detect solar particle radiation by its magnetic effect. A higher K-index generally means worse HF conditions.

A lower K-Index generally suggests better propagation on the 10, 12, 15, 17, & 20 Meter Bands; a low & steady Kp-Index generally suggest good propagation on the 30, 40, 60, 80, & 160 Meter Bands.

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