Tuesday, July 19, 2011
The Heat is On
So, here is what my weather is looking like for the next few days.
Heat advisory in effect from 10 am this morning to 8 pm edt this evening.
Early this morning. Partly cloudy. Light and variable winds.
Today. Mostly sunny. Highs in the mid 80s near lake Michigan and in the lower 90s inland. North winds around 5 mph becoming northwest late in the day. Heat index readings 94 to 99.
Tonight. Partly cloudy. Lows in the lower 70s. North winds 5 to 10 mph until midnight becoming light. Then becoming west around 5 mph toward daybreak.
Wednesday. Mostly sunny. Highs in the mid 80s near lake Michigan and in the mid 90s inland. Southwest winds 5 to 15 mph with gusts to around 25 mph. Heat index readings 100 to 105.
Wednesday night. Partly cloudy. Lows in the upper 70s. Southwest winds 10 to 15 mph.
Thursday. Mostly sunny. Highs in the mid 80s near lake michigan and in the mid 90s inland. Southwest winds 10 to 20 mph. Heat index readings 98 to 103.
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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