The Cayman Islands had a wet week. Nearly two inches of rain fell over a seven-day period, according to the Cayman Islands National Weather Service.
From 4 July through 7am Thursday, 1.94 inches of rain fell on Grand Cayman. That accounts for a third of the island’s typical rainfall for the month of July, which averaged 5.78 inches from 1981 to 2010.
A decrease in cloudiness and showers were expected starting Thursday afternoon, as an associated upper-level trough weakened in the northwest Caribbean, the National Weather Service said. Isolated showers in and around Cayman were observed moving west to northwest.
The chance of more rains remained, however, with forecasters predicting a 30% chance of late night showers and thunder on Friday.
The US-based National Hurricane Center reported Thursday morning that, “An upper-level trough extends from central Cuba to northeastern Nicaragua. This feature, along with the tropical wave over the central Caribbean are enhancing scattered moderate convection near Cuba, Jamaica, and the Cayman Islands.”
The islands had been experiencing a rain deficit, falling about 8 inches short of the annual 30-year average as of the end of May, according to forecaster Avalon Porter.
Cayman receives an average of 56.2 inches of rain a year, Porter said. From June 2018 through the end of May 2019, he said the island had received 48.14 inches of rain.
The island may be catching up, however. In May and June 2019, rainfall surpassed the average.
In May, 6.29 inches fell, compared to the average of 5.96 inches. Porter said 42% of the month’s rain fell on one day, 20 May.
In June, 6.65 inches fell, compared to the average of 6.2 inches. Seventy percent of that rain fell on 25 June.
The season’s first named storm, Tropical Storm Barry, poses no threat to the Cayman Islands, the weather service said. (Tropical Storm Andrea formed before the official 1 June start of the Atlantic hurricane season.)
Barry is forecast to make landfall on the southern coast of Louisiana by Friday, bringing the possibility of life-threatening floods to the Gulf Coast.
“The slow movement of this system will result in a long duration [of] heavy rainfall threat along the central Gulf Coast and inland through the lower Mississippi Valley through the weekend and potentially into early next week,” the National Hurricane Center reported Thursday morning.
“Flash flooding and river flooding will become increasingly likely, some of which may be significant, especially along and east of the track of the system.”
A separate, potential tropical system began forming Thursday southwest of the Cape Verde Islands, off Africa’s northwestern coast. As of Thursday morning, the NHC forecast a 10% chance of tropical formation over 5 days.
“Some slight development of the wave is possible during the next day or two while it moves westward at 15 to 20 mph, before environmental conditions become less favorable over the weekend,” the NHC said Thursday morning.