So, the Leonine prayers can eliminated as a practice for 6 months out of the year during hurricane season?

How about on Sunday, when neither the Leonine prayers nor the weather Blessing were said.

I don't know about Sunday. In your original post, you said that the weather blessing was said after the mass on Friday, Saturday, and Sunday. So were the Leonine Prayers and the weather blessing both omitted after a Sunday low mass?

Here's Fortescue on this question:

These Leonine prayers may be omitted after Low Masses which take the place of a solemn Mass, e.g., a conventual or capitular Mass; or which are celebrated with a certain solemnity, e.g., Mass for a first Holy Communion, for a general communion, for a marriage, for Confirmation, or an ordination or religious profession. They may also be omitted if any sacred function or pious exercise (e.g., Benediction, absolution for the dead) immediately and duly follows Mass, or when a homily has been given during Mass, also after a dialogue Mass, but on Sundays and greater feasts only.

I don't know about Sunday. In your original post, you said that the weather blessing was said after the mass on Friday, Saturday, and Sunday. So were the Leonine Prayers and the weather blessing both omitted after a Sunday low mass?

Here's Fortescue on this question:

These Leonine prayers may be omitted after Low Masses which take the place of a solemn Mass, e.g., a conventual or capitular Mass; or which are celebrated with a certain solemnity, e.g., Mass for a first Holy Communion, for a general communion, for a marriage, for Confirmation, or an ordination or religious profession. They may also be omitted if any sacred function or pious exercise (e.g., Benediction, absolution for the dead) immediately and duly follows Mass, or when a homily has been given during Mass, also after a dialogue Mass, but on Sundays and greater feasts only.

The Leonine prayers were omitted on Sunday. There was no weather blessing on Sunday.

According to the quote by Fortescue the Leonine prayers could be omitted for a pious function, but a weather blessing replacing the Leonine prayers for 6 months out of the year is not "a religious function". Moreover, it says the Leonine prayers may be omitted after a Dialogue Mass, which is very odd since Fortescue died before the Dialogue mass existed. Additionally, there are customs in each country, and what Fortescue suggests (If it really is him who said it) may not have been the practice in the USA.

I got the text I copied from The Ceremonies of the Roman Rite Described. This is from the 15th Ed. and has been revised post-Summorum Pontificuм. The portion that I quoted likely underwent a revision in 1959, when there was such a thing as a dialogue mass. (Well, there you go. That glaring addition makes the revision suspect)

So, I think we're left to question why the priest omitted the Leonine prayers at the Sunday low mass where there was no weather blessing. Perhaps he forgot to include them since, it would seem, he'd excluded them the previous two days because of the weather blessing. It might very well be that there is an innocent or even proper explanation why they were omitted. Absent contrary information, it would seem the safest course to assume there is such a legitimate explanation. (The Fortescue quote says it can be omitted on Sundays if there is a sermon, but again, it may also be part of the revision. Besides, it is not the custom in the USA, all the Low Masses I have gone to did not omit the Leonine Prayers.)
 
And that is mostly my point -- there are quite a few little rules that govern the liturgy that we don't necessarily know. (This is the excuse the priests used in the early 60's till present to change everything. I go by what was always done, the customs of my country. As soon as there is a change, I jump. )  I was only aware that the Leonine prayers were omitted when there is some other blessing or liturgical action because I looked it up after I noticed their omission. It turned out there was a good reason and, in fact, their omission was dictated by the rubrics. (the "rubrics" you quoted are from the time that all the changes took place, not reliable. Besides, there are different customs in every region.)

My responses in red.

For what it's worth, here is an article by the (in)famous Fr. Cekada, which discusses the legislation on this topic at page 11. The article goes on to suggest there is something to the idea that the prayers were maintained in America, but not in Europe.

An excellent contribution sir. This is an example of what Cathinfo is all about, teaching. I printed it and  read it all last night. Here's some snippets:


Only a handful of priests resisted the post-Vatican II liturgical changes at first, but not everyone retained the Leonine Prayers. I suspect this was the case in France, since at the St. Pius X Seminary in Ecône in the 1970s we never said the prayers publicly. (I recited them publicly after my first Mass in 1977, an act considered rather daring at the time.)   Most priests in America who first resisted the changes were well-known as dedicated patriots and vocal anti-Communists. These few stalwart men kept the Leonine Prayers alive when no one else in America did. It is to their eternal credit that they handed down the practice to a future generation which would see the prayers at long last bear fruit.

Vatican II (1962–1965), of course, had refused to condemn Communism, while Paul VI after his election in 1963 began to take the first tentative steps toward building what would come to be known as the “Vatican-Moscow Axis.” Since the Leonine Prayers were a reminder that Moscow was conducting a persecution, they were among the first things to go.  In 1964, even before the Council closed, the Vatican issued a liturgical instruction which contained the memorably brutal phrase: “The Last Gospel is omitted; the Leonine Prayers are suppressed.”
The intention Pope Pius XI decreed in 1930 for the Leonine Prayers, as we noted above, was the freedom of the Church in Russia — that “tranquility and freedom to profess the faith,” as he said, “be restored to the afflicted people of Russia.

On 1 October 1990 the Soviet Union enacted a law on freedom of conscience and religious organizations. It was a lengthy and detailed statute, running in translation to nearly 500 lines of miniscule print.  The law’s stated purpose was to guarantee the rights of citizens “to determine and express their attitude toward religion, to hold corresponding convictions and to profess a religion and perform religious rites without hindrance.”

The recent developments in Russia should be cause for a little less gloom and a little more optimism about our prayers. We traditional Catholics, after all, are the ones who kept right on saying the Leonine Prayers for our persecuted brethren in Russia. We may not have understood exactly what the Church’s intention was for these prayers, but God certainly did. And in His providence He granted His Church’s petition and our own.  Here, then, is something we traditional Catholics can point to as some welcome good news — and as a concrete confirmation of the power of the Church’s prayer.

Maybe we should pray for the conversion of America.