Sweltering Conditions Persist Across T&T. Showers, Isolated Thunderstorms Forecast Across South, West Trinidad.

As of 10:30 AM Tuesday 10th September 2019, sunny to partly cloudy skies are ongoing across Trinidad and Tobago with very hot conditions persisting.

Showers and thunderstorms are likely across the Southern half of Trinidad through the late afternoon, with additional activity across Western Trinidad during the afternoon. Street flooding and gusty winds may accompany these heavier or thundery showers.

Mostly settled conditions are forecast by the evening.

There are NO alerts, watches or warnings in effect for Trinidad and Tobago from the Trinidad and Tobago Meteorological Service at this time.

10:15 AM Tuesday 10th September 2019: Mostly clear skies ongoing across both Trinidad and Tobago, with the exception of Southern Trinidad, where the ITCZ is moving across the southern half of the island, bringing showers and isolated thunderstorms. Image: Trinidad and Tobago Meteorological Service
10:15 AM Tuesday 10th September 2019: Mostly clear skies ongoing across both Trinidad and Tobago, with the exception of Southern Trinidad, where the ITCZ is moving across the southern half of the island, bringing showers and isolated thunderstorms. Image: Trinidad and Tobago Meteorological Service

Temperatures

Last night’s minimum temperatures were warm at 26.1°C at Piarco, Trinidad, and 28°C at Crown Point, Tobago. Minimum low temperatures across Trinidad and Tobago tomorrow are forecast to range between 26°C-27°C, with temperatures at the upper end of the minimum low-temperature range favoring Tobago. Low temperatures are likely to be lower across inland and mountainous areas.

Today, maximum high temperatures across T&T are forecast to be near a hot 34°C at Piarco, Trinidad and a heat index ranging from 37°C to dangerous 48°C. Across Tobago, maximum high temperatures are forecast to be a warm 32°C with a heat index of 36-39°C. The heat index is an index that combines air temperature and relative humidity, generating a “feel’s like” temperature.

The Heat Index

The heat index is a combination of air temperature and relative humidity determining what the air feels like to a person i.e. how hot it actually feels.

The heat index is important because of sweating. Your body sweats in order to cool the skin and maintain a constant, healthy body temperature. This cooling process means that the sweat has to evaporate off the skin to remove heat. However, if the sweat is unable to evaporate, the body isn’t able to regulate temperature.

With high volumes of moisture in the air, also known as high relative humidity, which T&T regularly experience due to its tropical climate, the rate of sweat evaporation decreased. This is because the atmosphere is unable, or has limited potential to hold additional moisture in the atmosphere.

This results in you feeling warmer in humid conditions and cooler in less humid conditions i.e. when relative humidity decreases. As temperature increases, the heat index increases. As relative humidity increases, so does the heat index.

 Heat Index Values Explained
Heat Index Values Explained

The heat index is generally classified into four categories: caution, extreme caution, dangerous and extremely dangerous. Generally across Trinidad and Tobago, we experience heat indices of caution to extreme caution in times of hot days, with isolated areas experiencing dangerous heat indices such as urban areas.

Today, heat index levels are likely to remain at extreme cautious to dangerous levels. Heat cramps and heat exhaustion are likely with heatstroke probable with continued activity.

Heat Safety

Graphic: Beat the Heat. Heat related deaths are preventable.

Graphic: Beat the Heat. Heat related deaths are preventable.

Source: MEMA
Heat Safety Tips and Resources
Heat Safety Graphic. Source: Heat Safety Tips and Resources

Seas

Seas are forecast to be slight to moderate with waves up to 1.5 meters in open waters and near calm in sheltered areas.

Over the Next 24 Hours

Weather: Though hot and sunny conditions will prevail across the northern half of Trinidad and Tobago, the ITCZ is forecast to bring showers and thunderstorms across the southern half of Trinidad on Tuesday.

As the day progresses, isolated to scattered showers are forecast to also affect parts of Western and Central Trinidad with a few thunderstorms. These showers will interrupt partly cloudy to cloudy periods, so don’t expect constant rain throughout the day, but keep the umbrella close by if you’re heading out.

Winds: Sustained surface winds between 15 KM/H and 30 KM/H with gusts in excess of 50 KM/H are possible in heavy showers or thunderstorms across Trinidad and Tobago.

With wind gusts in excess of 50 KM/H, whole trees are expected to be in motion and there may be some inconvenience when walking against the wind gusts. Light outdoor objects may topple or become airborne such as garbage cans, potted plants, loose galvanize or construction material and other outdoor furniture. Tents may jump. Older/weaker trees may fall, bringing down utility poles and lines.

High Wind Event Precautions
High Wind Event Precautions

Rainfall: No widespread, significant accumulation is forecast across T&T. In isolated downpours across Southern and Western Trinidad, up to 20 mm possible with thunderstorms and downpours, totals up to 50 millimeters are possible in highly localized areas.

Generally, with heavy showers and thunderstorm activity, street flooding, particularly in flood-prone areas or areas with poor drainage, is possible as well as flash flooding in areas where more prolonged heavy rainfall may occur.

Frequent Lightning: In addition, with forecast thunderstorms, frequent lightning is likely.

Why I May Not/Will Not See Constant Rainfall?

A frequent complaint is the forecast is wrong because I didn’t experience any rainfall. Scattered showers mean that you, individually, may experience some showers intermittently throughout the day and there is a higher chance for this activity than isolated activity.

Today, isolated activity is forecast.

Forecast - Isolated, Scattered, Widespread - What do they mean?
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