Current Drought Monitor Map for Puerto Rico and the U.S. Virgin Islands
United States Drought Monitor
Summary for Puerto Rico this week
In Puerto Rico, no changes were made given the degradations that were introduced last week. Note that deficits continue to build in the eastern part of the island, where deficits of about 4 to 13 inches have occurred over the last 90 days.
U.S. Virgin Islands
Summary for the U.S. Virgin Islands this week
The Cyril E. King Airport had only 0.33 inch of rain during this drought week (December 4-10, 2019). The airport’s month-to-date precipitation of 0.82 inch is 77.4% of normal rainfall. The CoCoRaHS station at Anna’s Retreat 2.5 ESE had slightly higher rainfall totals at 0.64 inch of rain for the week and 0.83 inch for the month-to-date. The Cyril E. King Airport’s year-to-date rainfall was 33.02 inches or 88.2% of normal rainfall. SPI values for 1 and 3 months were -0.83 and -0.98, typically representing moderate drought, while SPI values for 6, 9, and 12 months indicated no drought development. St. Thomas drought classification was changed to short-term abnormally dry conditions (D0-S).
According to data from the Henry E. Rohlsen airport, only 0.11 inch of rain fell during this drought week. The month-to-date rainfall was 0.61 inch or 54.5% of normal rainfall. However, the CoCoRaHS station at Christiansted 1.8 ESE reported for the week 1.02 inches of rain and 1.47 inches for the month-to-date. The year-to-date rainfall total at the airport is 22.72 inches or 61.7% of normal rainfall. Meanwhile, the East Hill COOP station had 26.28 inches of rain for the year-to-date, which is 75% of normal rain. SPI values at 1, 6, and 9 months indicate moderate drought, while 3 and 12 months indicate extreme and severe drought, respectively. For this week, St. Croix’s drought classification remained as in moderate drought (D1-SL).
According to data provided by a volunteer observer, St. John had only 0.06 inch of rain during this drought week. The month-to-date rainfall total (as of December 9, 2019) was 0.75 inch. The year-to-date value of 34.71 inches of rain is 78.0% of normal. SPI values for 1 and 3 months were -1.12 and -1.34, respectively, typically representing moderate to severe drought conditions. While the 9 and 12 months indicate abnormally dry to moderate drought conditions. St. John’s drought designation was changed to moderate drought this week.
About the Drought Classification
The Drought Monitor summary map identifies general areas of drought and labels them by intensity. D1 is the least intense level and D4 the most intense. Drought is defined as a moisture deficit bad enough to have social, environmental or economic effects.
D0 areas are not in drought, but are experiencing abnormally dry conditions that could turn into drought or are recovering from drought but are not yet back to normal.
We generally include a description on the map of what the primary physical effects are for short- and long-term drought.
- S = Drought typically less than 6 months (e.g. agriculture and grasslands)
- L = Drought typically more than 6 months (e.g. hydrology, ecology)
Source: United States Drought Monitor
The U.S. Drought Monitor is jointly produced by the National Drought Mitigation Center at the University of Nebraska-Lincoln, the United States Department of Agriculture, and the National Oceanic and Atmospheric Administration. Map courtesy of NDMC.