Curious, a red rainbow. My first thought was Obama's rainbow-farting unicorns forgot their camo. But, the Mayans regarded the red rainbow as a particularly dangerous sign from the underworld. They, in fact, regarded all rainbows as dangerous.
The most interesting thing regarding red rainbows, though, comes from China. Confucianism. If you know Biblical prophecy, look for the potential parallels:
One night during the fourteenth year of Duke Ai of Lu, Confucius dreamed that a red smoky qi arose between three locust-trees in the states of Feng and Pei. He called Yan Yuan and Zi Xia to go and look at it. They drove their chariot to the Street of the Fan Clan in the north-west of Chu, where they met a grass-cutter boy who had picked up a unicorn, wounded in its left forefoot. He had covered it with fuel.
Confucius said, "Boy, come here. What is your family name?
He said, "My family name is Chisong ("Red Reciter"), my given name is Ziqiao ("Master Lofty"), and my style is Shouji ("Receiving the Regulations")."
Confucius said, "Have you seen anything, or not?"
The boy said, "I saw an animal, as big as a lamb. It had a horn on its head, which had flesh on it to the end."
Confucius said, "All-under-Heaven has got a master. He will be the Red Liu; Chen (She) and Xiang (Yu) will be his assistants. The Five Planets will enter the asterism Jing, following the Year-Star."
The boy opened up the fuel and brought down the unicorn to show Confucius. Confucius went towards it, and the unicorn, covering its ears, spat out three rolls of Charts, three inches broad and eight inches long. Every roll had twenty-four characters, which said the Red Liu were due to arise: The Zhou is lost; the red qi is arising, flourishing in great splendor. The Dark Qiu (Confucius) will regulate the Mandate for the Emperor Mao-jin.
Confucius wrote the Annals, and formulated the Canon of Filial Piety. When he was finished, he had the seventy-two disciples face the Northern Dipper, bow deeply, and stand still. He had Zeng Zi embrace the River (Chart) and the Luo (Document) and face north. Confucius fasted and abstained, and did obeisance to the Northern Dipper, announcing to Heaven that all had been completed: "The four rolls of the Canon of Filial Piety, the Annals, the River (Chart) and the Luo (Document), in all eighty-one rolls, have reverently been completed." Heaven then raised in luxurious abundance a white fog that touched the earth, and a red rainbow from above to below, which changed into a yellow jade, three feet long, with a carved text on the top. Confucius knelt to receive it, and read it: The precious text has come forth; Liu Ji will grasp it. Mao-jin-dao is to the north of the asterism Zhen. His style will be Hezi, and all - under - Heaven will submit to him.
Interesting as the above might or might not be, you probably have a large amount of particulate matter in the atmosphere up there in Michigan for some reason. Haven't heard of any dust storms or volcanoes. When we get extremely colorful sunsets here in NC, it can be due to Chinese or African dust storms, the rare large volcanic eruption such as Mt. St. Helens or a very large forest fire.
Then, there's the old sailor's adage, Red skies at morning, sailors take warning.
Not much positive symbolism there that I can find, lol.