The National Oceanic Atmospheric Administration (NOAA) hurricane hunter investigated a strong tropical wave with its axis now near 58°W, south of 15°N this afternoon and found that the wave lacks a well-defined circulation. Although the system continues to be disorganized, some gradual development remains likely later this weekend or early next week as the system moves quickly westward crossing the Windward Islands later tonight into tomorrow.
Regardless of development, brisk surface winds of 25 to 30kt (45 to 55km/h) with higher gusts and pockets of moderate to heavy showers are anticipated with rainfall accumulations of 100 to 150mm (4 to 6 inches) possible over St. Vincent and the Grenadines during the passage of this system. Thus, a FlashFlood Watch is in effect for St. Vincent and the Grenadines from 6:00 p.m today, Saturday 21st September until 6:00 pm Monday 23rd September, 2019.
A Flash-Flood Watch means that flooding due to heavy or excessive rainfall in a short period of time (generally less than six hours) is possible within the Watch area.
Persons living near rivers and streams, in flood-prone areas and areas prone to land-slippage and landsslides should take all necessary precautions
In addition, deteriorating sea-conditions with east-southeasterly swells of 3.0 to 4.0m (10 to 13ft) are likely. Thus, a High-Surf Advisory and Small-Craft Warning are also in effect from 6:00 pm today, Saturday 21st September until 6:00 a.m Monday 23rd September, 2019.
A High-Surf Advisory is issued when breaking wave action poses a threat to life and property within the surf zone.
A Small-Craft Warning means in this case, that wind-speeds of 25 to 30kt (45 to 55km/h) and /or seas greater than 3m (10ft) will be affecting the marine area.
This flood watch may be upgraded to a warning if conditions warrant.