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Trinidad & Tobago Meteorological Service
HAZARDOUS SEAS ALERT #2- YELLOW LEVEL




Trinidad & Tobago Meteorological Service
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FORECAST


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SUB-SEASONAL (WEEK 3 AND WEEK 4 AHEAD) RAINFALL PREDICTIONS FOR TRINIDAD AND
TOBAGO

The interactive map provides intra-seasonal rainfall climate information for
decision-making in climate sensitive communities, where sub-seasonal forecasts
are particularly well suited.

The interactive map shows the latest forecast for week 3 and week 4 ahead (i.e.
the 7-day Saturday-Friday target period, 15-21 days and 22-28 days after the
date the forecast is issued). New forecasts are issued weekly on Fridays.

SEE INSTRUCTIONS BELOW THE MAP



INSTRUCTIONS

When navigating to a forecast, move the mouse over a bubble representing an area
to get the possible rainfall total for week 3 ahead.



Clicking on any bubble on the forecast map will show, for week 3 and week 4
ahead, possible rainfall totals, percentage chance of wet or dry conditions and
percentage change of exceeding 10mm and 25mm.

This sub-seasonal-to-seasonal forecasting product is still under development.

 

Wind
 * Calm (≤ 2 Kts)
 * Light breeze (2 – 10 Kts)
 * Breezy (11 – 15 Kts)
 * Windy (16 – 26 Kts)
 * Strong Winds (27 – 33 Kts)
 * Gusty (Sharp increase > 10Kts above average)
 * Near Gale Strength or Gale Strength Winds (34 – 47 Kts)
 * Storm Strength Winds (48 – 63 Kts)
 * Hurricane Strength Winds (> 63Kts)

Degree of Daily Sunshine
 * Long, Sunny Spells (=Clear, Cool Night)
 * Sunny Intervals
 * Little Sunny Breaks or Gloomy
 * Dull & Hazy (=Dull, Hazy Night) [Diffused Sunlight through lithometeor]
 * Note: Except where a sunny day (even those Dull and Hazy) continues into a
   night of no showers (A Clear, Cool Night or Dull, Hazy Night), Rainfall/Wind
   descriptors should be used as forecasting terms for nighttime.

Rainfall (Rain or Showers)
 * Time of Occurrence/Cessation
 * Type (in Character/intensity, Space & Duration)
 * Accompanying Thunder, Lightning & Gusty Winds and or resultant flash
   flooding/landslide/landslip
 * Probability

Transitioning of Weather
 * Gradual
 * Deteriorating
 * Interrupted
 * Prevailing or Dominant
 * Rapid
 * Alternating
 * Improving

Seas
 * Calm (0 -0.5 Meters)
 * Slight (0.5 – 1.25 Meters)
 * Moderate (1.25 – 2.5 Meters)
 * Rough (≥ 2.5 Meters) (Big Waves)
 * Choppy (rough but with small waves i.e. < 2.5 Meters)

Probability
 * Slight Chance = 20% Chance
 * Chance = 30 - 50% Chance
 * Likely = 60 - 70% Chance

Type (Character, Space & Time)

Character

 * Light
 * Moderate
 * Heavy
 * Violent
 * Thundery or Thundershowers

Space

 * Few Confined Areas
 * Varying Localities
 * Broad Areas
 * Hilly Areas
 * Countrywide
 * North, South, East, West, Central or any combination of these

Time

 * Brief
 * Intermittent
 * Frequent
 * Lengthy Periods
 * Continuous

 

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