Monthly weather summaries are prepared by the climate section of the National Meteorological Service of Belize. The NMS of Belize maintains a network of over 25 weather stations that are situated primarily in the agricultural regions of the country. Temperature and rainfall are read at 9 am each morning and the rainfall total read at this time represents the accumulated rainfall for the previous day.
June marks the official start of the Hurricane Season for the Atlantic Basin including the Gulf of Mexico and the Caribbean Sea. Also by June first the rainy season has normally started for most of the country.
June 2018 started off a bit moist just in time for the start of the rainy season. The most significant features on June 1 were at the upper levels as a TUTT/Low to the northwest and ridge over the Caribbean supported a moist divergent southwesterly flow aloft. These produced a few showers over southern and coastal areas, including over the Maya Mountains. This upper level pattern persisted through the 4th with moisture, showers and thunderstorms increasing. Additionally, the first tropical wave of the season crossed the country on the 5th supporting an increase in moisture at all levels of the atmosphere. Showers, rain and isolated thunderstorms developed mostly along the eastern slopes of the Maya Mountains.
The Atlantic High Pressure Ridge dominated behind the wave tightening pressure gradients over the area and supporting a drier and gusty airflow on the 6th. This supported mainly fair conditions with no significant shower activity. Similar conditions continued on the 7th except for a few more showers in the south. Moisture increased a bit on the 8th with slightly more showers. The second tropical wave for the month crossed between the 9th and 10th but it came under unfavorable conditions at the upper levels. However it did trigger a few showers and isolated thunderstorms over the south and mountains on the night of the 9th. On the 10th showers and rain affected the southern three-fourths of the country.
An east to southeasterly low level flow coupled with convergent conditions aloft supported mainly fair weather on the 11th. Moisture increased slightly on the 12th but showers and thunderstorms remained generally isolated. Conditions gradually become more moist from the 13th through to the 16th. A surface trof lingered near the coast of Belize and Yucatan and a tropical wave was also approaching. This supported a few showers, thunderstorms and rain across the country up to the passage of the third tropical wave between the 15th and 16th. The upper levels had also become a bit more divergent during this period.
Following the passage of the tropical wave conditions improved across the country from the 17th through to the 19th with little to no rainfall by the 19th. Except for isolated thunderstorm inland during the 20th mainly fair weather continued. The 21st was also notably dry with little to no rainfall. The upper dynamics favoured a slight increase in showers, thunderstorms and periods of rain mainly over central and northern areas on the 22nd. This was caused by upper diffluence between a TUTT/Low over the Bay of Campeche and ridging to the east. The fourth tropical wave for the month arrived under these favourable upper dynamics on the 23rd supporting cloudy skies with some showers, thunderstorms and periods of rain from the Belize district southward.
Similar to what occurred after the passage of the earlier tropical waves, conditions once again improved significantly on the 24th behind this wave. The Atlantic High Pressure Ridge rebounded to support mainly fair weather with little to no rainfall. A very weak an inactive tropical wave (the fifth for the month) crossed on the 25th but showers remained generally isolated. Another weak tropical wave (the sixth) raced across mostly to the south between the 26th and 27th. This produced some showers, thunderstorms and periods of rain in the south on the morning of the 27th. Showers remained isolated for the rest of the country.
The remainder of June 2018 was warm and mostly dry. The 7th and final tropical wave for the month crossed between the 29th and 30th but it did not produce any significant rainfall across the country.
The graph and maps below summarize the total rainfall and average maximum and minimum temperature recorded during the month of June 2018. They also give an indication of how these readings compare to the normal for the month across the stations sampled. As can be seen, rainfall was below normal for central and and especially northern areas. Meanwhile rainfall for June 2018 was just about normal over southern areas (Southern Stann Creek and Toledo districts). In terms of maximum temperatures, most of the stations sampled here saw below normal maximum temperature in June 2018. The only exceptions are Tower Hill and Pomona. Meanwhile slightly warmer than normal minimum (nighttime) temperatures were recorded at The Belize Zoo, the Airport, Central Farm and Belmopan. The situation was the reversed at Tower Hill, Pomona, Melinda and Punta Gorda where the minimum was lower than normal.
Forecaster: Gordon, Ronald
Last Updated: Tue, Jul 17, 2018 | 09:50 AM