A tropical wave is causing showers and isolated thundershowers across the southern Caribbean waters. The strongest showers have remained over the local and outer waters so far this morning. The wave, and its associated moisture, will continue to race off to the west today. Behind the tropical wave is a dry Saharan air mass which is expected to hold through Thursday morning. The drier air will limit the development of showers on Wednesday and Thursday. By late Thursday, an increase in low-level moisture may lead to the development of a few showers from time to time. Today`s high temperatures are forecast to reach the middle to upper 80s with winds out of the east to southeast at 15-20 miles per hour.
Hazardous marine conditions with seas to eight feet are expected across the Atlantic waters and Anegada
Passage tonight due to the arrival of a northerly swell. As this swell spreads across the local waters, seas to ten feet are expected. Small craft advisories are in effect. And given these marine conditions, there is a high risk of rip currents for beaches along the north coast of St. Thomas. The high rip current risk will likely be extended to most beaches as conditions continue to deteriorate today.
IN THE TROPICS
A small low pressure system located a little more than 1,000 miles east of the Lesser Antilles continues to produce disorganized showers and thundershowers. This system has changed little in organization since yesterday, but conditions are still expected to be conducive for the formation of a tropical depression during the
next day or so while the system moves slowly northwestward to west-northwestward. There is a 70% chance of further development through two days, and a 90 percent potential for tropical development through five days.
Sunrise: 6:08 a.m.
Sunset: 6:21 p.m.
FROM THE 3D MANDAHL WEATHER STATION
Monday’s high temperature: 88 degrees at 11:03 a.m.
Monday’s low temperature: 75 degrees at 6:11 p.m.
Peak wind gust: 20 miles per hour at 5:51 p.m.
24-hour rainfall: 0.67 inches
Monthly rainfall: 1.77 inches
Original Source: https://stjohnsource.com/2019/09/17/showers-tuesday-dryer-wednesday-and-thursday/