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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 Friday - Thursday 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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