Record August Rainfall


30 Day Precip Anom_A
NASA’s Tropical Rainfall Measurement Mission (TRMM) satellite derived rainfall anomalies for the last 30 days (most of August). The black line indicates the track of Hurricane Cristobal and the white line indicates the position of a persistent stationary front.

August 2014 officially ended with 14.09″ of rain at the Bermuda Weather Service making it the wettest August there since 1949. This is more than twice what would be considered normal for August and this beats the previous record of 12.23″ set in 1997. 21 days saw measurable rainfall, six of which had more than an inch of rain; two of those with more than two inches of rain as measured at the Bermuda Weather Service. Rounds of heavy rain were also associated with rain cooled air related to three daily record low temperatures. Further, mean temperatures for August 2014 were near 2.5°F below the 1979-2000 climate period average. Unofficial precipitation reports for August 2014 show similar results around the island with monthly totals ranging between 12-15″.

The TRMM satellite data pictured above shows the spatial extent of the above normal rainfall. Typically, summertime rainfall in Bermuda occurs in isolated showers, tropical cyclones, or stationary fronts. We can see the track of Hurricane Cristobal in the peak anomalies, starting over the Turks and Caicos Islands and then northward and northeastward from there. Additionally, the location of a stationary front oriented roughly west to east near Bermuda can be picked out with much of the precipitation occurring on the ‘warm’ side of the front.

 

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