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Monthly Weather Summary



April 2015

Climatologically, the Atlantic High Pressure ridge usually dominates the region during the month of April. Its orientation typically produces a dry southeasterly airflow across the country. At times heat-lows may develop across southern Mexico which causes pressure gradients to tighten over the area resulting in gusty winds. However, when the centres of these systems are over or very near the country, pressure gradients would instead slacken causing light winds and an excessively high heat-index. This overall synoptic pattern for the month normally corresponds with dry and warm weather. The only relief would come in the form of an occasional cold front. On average about two cold fronts would cross the country during the month. These may be accompanied by strong to severe thunderstorms and they are the main producers of the little rainfall for the month.  April 2015 was characteristically warm and dry. Only one cold front crossed the country on the very last day of the month.

The first day of the month started out cloudy at times with a few showers as a relatively moist easterly airflow dominated. The airflow continued easterly the following day but moisture decreased and only isolated showers were observed. A similar situation occurred on the 3rd.  The flow shifted to the east to northeast on the 4th through to the 7th but moisture remained low and conditions were mainly fair and dry. The flow veered once more to the east on the 8th through to the 11th but weather conditions continued generally fair with only isolated showers across the country.

The characteristically warm and dry weather started on the 12th when heat lows over Mexico coupled with the Atlantic High Pressure ridge to the northeast of area caused the dry and gusty east to southeasterly airflow to set in. This pattern actually lasted until late in the month around the 26th. This resulted in warm and mostly dry weather with little to no rainfall across the country, except for an occasional afternoon thunderstorm in the interior. Temperatures increased significantly around the 21st and peaked around the 28th of the Month. Maximum temperatures in excess of a 100°F occurred over some inland areas on several days during this period.

The late-season cold front began approaching the country around the 28th. On that day a prefrontal trof over the area caused afternoon thunderstorms to flare up inland and over the northern districts. Thunderstorms once again flared up on the 29th but this time they moved across the country by nighttime as the cold front was getting nearer. The cold front was over Belize on the 30th and it produced a generally cloudy day. However, by that time most of the thunderstorm and shower activity were confined mainly to the Sea.


R. Gordon