True signs of spring have rapidly appeared after the recent snowstorm in parts of Upper Michigan.

First of all, the peeper is being heard again. There were a couple of reports after the warm spell in March. Then it turned colder and not a â??peepâ?? was heard. Then last evening after the warmest day so far in 2015, several reports came in. There were peepers heard near Iron Mountain, Escanaba and Ontonagon. This morning a facebook friend in Ontonagon heard peepers when she let the dogs out.

I make such a big deal out of peepers because I consider them the â??sentinelsâ?? of spring. They start their mating calls as soon as the swamps and lowlands are open. They tell us humans that the earth has thawed out after a long, hard winter.

Another sign of spring is lightning and thunder. This morning it was seen and heard around Marquetteâ??another sign that the atmosphere is gaining the moisture and instability of the warm season.

Of course, April is a changeable month. Weâ??ve seen that demonstrated just over the last several days. Robert Frost penned this poem about the fourth month. He wrote it from the perspective of a New Englander but it certainly can apply to Upper Michigan:

â??The sun was warm but the wind was chill.

You know how it is with an April day.

When the sun is out and the wind is still,

You're one month on in the middle of May.

But if you so much as dare to speak,

a cloud come over the sunlit arch,

And wind comes off a frozen peak,

And you're two months back in the middle of March.

Yes, we may be sent back to the â??middle of Marchâ?? before the month is over. However it will be mild the next several days. Enjoy.