- Whistlers are once again being heard as of last night (Thursday
night) into this morning. The strength of the whistlers is somewhat low
with a volume around S1-S2 with a rare S3 every few hours. (scale of
1-5). From the house, I'm capable of hearing several per minute but dare
not venture out unnecessarily due to the worst winter storm so far of the
- Hi Michael,
My assumption is the whistlers this morning are being heard in a line from Texas up through Montana. The lightning generating the activity is moving Eastward and may generate whistlers for Illinois later today or tomorrow.
I use the following map to watch lightning conditions:
When monitoring VLF activity at a quiet location miles from power lines many of us have used a scale similar to the following:
S1 - Very faint to weak
S2 - Clearly audible but not loud
S3 - Loud
S4 - Very loud
S5 - Strongest whistlers possible/overloading receiving equipment
My home receiver is 1 to 2 notches lower in sensitivity than at a quiet location. The whistlers are reaching S2 into S3 on the home receiver which roughly equates to S3 to S4 at a quiet location.
I hope your receiver and setup are all fixed and working now. This is a great time of the year (near an equinox) for whistlers in the United States.
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