Summary & Outlook

Weather Summary
Period: 8:00am  (October 18th) until 8:00am (October 19th

Cloudy to overcast conditions dominated this summary period as a tropical wave brought moderate to strong convective activity to the southeastern Caribbean. An abundance of deep-layered moisture and marginal instability trailing the wave facilitated the showery activity Wednesday night into Thursday morning. Radar imageries depicted widely scattered to scattered showers with varying intensities throughout the period. By Thursday (8:00 am), the 24-hour precipitation amounted to 18.8 mm which increased October’s total rainfall to 103.4 mm. However, reports suggested that far more precipitation fell elsewhere.

 

Windy conditions were recorded with easterly to south-southeasterly at 13 – 30 mph (moderate to strong breeze). During periods of moderate to heavy showers, gusts reached near 35 mph (gale force). In turn moderate to rough seas with waves up to 6 feet in open water were experienced particularly off the east coast. Wednesday's maximum temperature rose to 28.6 ºC and the minimum on Thursday morning was 23.8 ºC (MBIA). The absence of any significant Saharan Air Layer (SAL) allowed the horizontal visibility to remain between 14 - 20 kilometers with the exception of periods of significant precipitation.


Period: 8:00am (October 19th) until 8:00pm (October 20th)

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Cloudy to overcast and windy conditions are expected to continue across the state of Grenada as widespread convective activity and prolonged precipitation stream westward. Model guidance is predicting that deep-layered support will continue throughout the day (Thursday) before gradual dissipation by evening. Overnight, fewer clouds and precipitation are expected and extending into Friday. Again, this improvement coincides with increasing stability and decreasing moisture. Flooding and landslide events are forecast for more of the state until Thursday evening.

 

Easterly to southeasterly winds are expected throughout Thursday and into Friday. Tight pressure gradient will result in surface wind speeds 16 – 26 mph (moderate to strong breeze). In addition, gale-force gusts are expected during periods of precipitation. Hence, a marine advisory remains in effect. The maximum temperature within this outlook period is forecast to reach near 31.0 °C while the nighttime minimum temperature will descend to near 22.0 °C. The horizontal visibility is forecast to remain above 10 kilometers (lower values with moderate to heavy showers) for the first few hours of the outlook before increasing overnight as the showery activity decrease.