Record Heat for October 2015

30 11 2015

Dale C. S. Destin |

A number of temperature records were broken or equalled during October across much of Antigua and Barbuda. The first day of October, we measured at the at the Met Office, located V. C. Bird International Airport (VCBIA), the highest temperature on record for the month – 34.0 °C (93.2 °F), and the fifth highest for all months dating back to 1971.

heatwave

We also recorded the second highest temperature for October – 33.9 °C (93.0 °F), and the sixth highest ever recorded at VCBIA.

These extreme temperatures were a part of a heatwave which began on September 30 and continued through October 7. During this time, the daily maximum temperatures were at record high or among the 10 percent highest temperatures for the given period.

The eventual mean daily maximum temperature (the mean of highest temperature for each day) was 31.2 °C (88.2 °F) or 0.6 °C (1.1 °F) warmer than normal. It tied with five other Octobers for the highest for the month.

Meanwhile, relative to October, minimum temperatures were quite oppressive. Many nights saw record or near record high minimum temperatures. There was a record number of “warm nights” (minimum temperature among the top 10 percent highest) – 12, shattering the previous record of 8 the month.

The mean minimum temperature (the mean of lowest temperature for each day) tied with that of October 2001 for the highest on record for the month.

The mean minimum temperature – 25.5 °C (77.9 °F) was 1.1 °C (2.0 °F) higher than normal. The excess (anomaly) above the usual mean minimum temperature for October was around twice that of the excess above the usual mean maximum temperature. Thus, the cooling that normally occurs at night did not take place, allowing for very little needed respite from the heat.

The overall, the mean daily temperature was also near record high – 28.1 °C (82.6 °F) or 0.6 °C (1.1 °F) higher than normal. It tied with 2001 for the third highest for October.

Sea surface temperatures (SSTs) around Antigua and Barbuda were also at record high levels for the month – 29.6 °C (85.3 °F) or 0.9 °C (1.6 °F) warmer than usual and tied with 2013 for the warmest SSTs for our area for October, dating back to 1854.

Oct2015_SSTs

October also saw record high SSTs across the tropical North Atlantic and Caribbean Sea – 28.6 °C (83.5 °F) or 0.7 °C (1.3 °F) higher than normal.

On a global scale, it was the warmest October on record with the global mean surface temperature was near 15.0 °C (59.0 °F) or 1.0 °C (1.8 °F) higher than usual.

Much of the warmth across Antigua and Barbuda and the rest of the region were due to the persistent weak nature of the Atlantic high pressure system, mainly during September, which translated into light winds that allowed for SSTs to soar.

We will let you know if this warm trend continued through November, shortly.

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Near Record Temperatures Over the Past 24 Hours!

2 03 2013

Dale C. S. Destin |

Many parts of Antigua had near record temperatures over the last 24 hours. Last night the minimum temperature dropped to 19.2C/66.6F. This was the second coldest night for March 1, based on record dating back to 1971; it was also the second coldest night, so far, for the year. The coolest temperature on record for this day is 18.8C/65.8F measured in 2000. A combination of things came together to cause this near record cold night: Cold air from North America, calm or near calm overnight wind and a relatively dry atmosphere.

Meanwhile, today (March 2) had a near record high temperature with a value of 29.8C/85.6F. This was the second warmest March 2 on record. The record for this day is 30.4C/86.7F in 2010. The main reason for this near record high temperature was the light east to east-southeasterly wind.

We will not likely see a repeat of these values over the next 24 hours; however, the weather pattern suggests that next week (by Antigua standards) will be quite quite warm during the day and quite cold at night. Records could be broken; 32.9C/91.2F (2010)and 17.0C/62.6F (2000) are the highest and lowest temperatures respectively for March. Remember to please take our weather survey: click for weather survey





It was Hell Today – Did You Notice?

4 09 2012

Dale C. S. Destin

Hot like hell! Today’s (4Sep, 2012) maximum temperature shattered the previous record for September. Today’s maximum of 34.3°C/93.7°F is now the highest on record (1971-2012) for September going well pass the month’s previous high of 33.5°C/92.3°F. It was also the second highest temperature on record for all months. Only August of 2005 had a higher maximum temperature with 34.9°C/94.8°F. In terms of how it actually felt to the human body; the heat index is a measure of this, and it peaked at 37°C/99°F. So although the maximum was 34.3°C/93.7°F, it really felt like 37°C/99°F. The heat index is a function of the temperature and the relative humidity. Today’s humidity was low; in the 40’s and 50’s; if it were higher, the heat index would have been higher and conditions would have been much more miserable even dangerous (http://en.wikipedia.org/wiki/Heat_index).

The conditions that led to today’s maximum temperature were light southerly wind and few low level clouds. These conditions were caused by the proximity of Tropical Storm Leslie between the Caribbean and Bermuda.

Conditions for the next four days are expected to be similar to today – light southerly winds and few low level clouds; hence, the rest of the week is expected to have above normal temperatures. These temperatures and resultant heat indices could reach dangerous levels. Residents should take precautions (http://www.epa.gov/heatisland/about/pdf/EHEguide_final.pdf)








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