There were multiple large natural disasters in the past two months. The Jewish newspapers referenced a letter from the Chafetz Chaim saying that HaShem does natural phenomena in the world to spur us to do Teshuva and cling to Him.
As a background of what the newspapers/newsletters were talking about:
ד׳ אלול Hurricane Harvey made landfall on USA mainland (Category 4)
י״ט אלול Hurricane Irma made landfall on USA mainland (Category 4)
- כ״ט אלול Hurricane Maria made landfall on Puerto Rico-USA territory (Category 4)
Weather.com wrote: "This is the first time on record two Category 4 landfalls occurred in the continental United States in the same hurricane season, much less within 16 days." And that was not considering the hurricane to Puerto Rico. All of this happened in the month of Elul. A month dedicated to Teshuva and preparation for the Yamim Noraim (Days of Awe).
I've searched online a lot for a source for the letter of the Chafetz Chaim, and even found a forum where someone asked about locating it, but with no success on receiving an answer.