Weather systems affect Cayman in 2018

January: Weather charts indicate that a cold front moved across the Cayman area on January 9th 2018. The system supported cloudiness and showers with an accumulation of 0.56 measured by the Cayman Islands National Weather Service at the Owen Roberts International Airport on January 9th 2018. Weather charts indicate that a cold front moved across the Cayman area on January 14th 2018. The associated high pressure system supported fresh to strong north to northeast winds and rough seas from January 13th 2018. The Cayman Islands National Weather Service issued a marine warning for the system from January 13th 2018 until January 16th 2018. Weather charts indicate that a cold front moved across the Cayman area on January 18th 2018. The associated high pressure system supported fresh to strong northerly winds and rough seas from January 17th 2018. The Cayman Islands National Weather Service issued a marine warning for the system from January 17th 2018 until January 21st 2018. Weather charts indicate that a high pressure system over the Gulf of Mexico supported fresh to strong northeast winds and rough seas from January 25th 2018. The Cayman Islands National Weather Service issued a marine warning for the system from January 25th 2018 until January 28th 2018. Weather charts indicate that a cold front moved across the Cayman area on January 30th 2018. The associated high pressure system supported fresh to strong northerly winds and rough seas from January 30th 2018. The Cayman Islands National Weather Service issued a marine warning for the system from January 30th 2018 until February 1st 2018. The total measured accumulation of 1.44 inches or 0.60 of an inch below the normal 2.04 inches of the 30 year average for January.

February: Weather charts indicate that a high pressure system over the western Atlantic Ocean supported fresh to strong northeast winds and rough seas from February 07th 2018. The Cayman Islands National Weather Service issued a marine warning for the system from February 07th 2018 until February 16th 2018. Weather charts indicate that a high pressure system over the western Atlantic Ocean supported fresh to strong northeast winds and rough seas from February 19th 2018. The Cayman Islands National Weather Service issued a marine warning for the system from February 19th 2018 until February 23rd 2018. The total measured accumulation of 0.61 of an inch or 0.89 of an inch below the normal 1.50 inches of the 30 year average for February.

March: Weather charts indicate that a high pressure system over the southwestern United States supported fresh to strong northeast winds and rough seas from March 27th 2018. The Cayman Islands National Weather Service issued a marine warning for the system from March 27th 2018 until March 29th 2018. The total measured accumulation of 0.29 of an inch or 1.03 inches below the normal 1.32 inches of the 30 year average for March.

April: No significant weather systems for April. The total measured accumulation of 0.49 of an inch or 0.78 of an inch below the normal 1.27 inches of the 30 year average for April.

May: Weather charts indicate that an upper level trough on May 14th 2018 supported the development of daytime showers with an accumulation of 0.54 of an inch or rainfall measured by the Cayman Islands National Weather Service at the Owen Roberts International Airport. Weather charts indicate that an upper level trough interacted with a surface trough to produce an area of cloudiness and showers over the northwest Caribbean on May 21st 2018. The system produced an accumulation of 3.84 inches on May 21st 2018, 1.56 inches on May 22nd 2018 as measured by the Cayman Islands National Weather Service at the Owen Roberts International Airport. The Cayman Islands National Weather Service issued flood warnings for the event. Weather charts indicate that a broad area of low pressure formed west of the Cayman Islands on May 23rd 2018. The Cayman Islands National Weather Service issued marine warnings for the event and measured a rainfall accumulation of 0.71 of an inch on May 23rd 2018. Weather charts indicate that Subtropical Storm Alberto formed west of the Cayman Islands on May 25th 2018. The Cayman Islands National Weather Service issued marine warnings for the event and measured a rainfall accumulation of 1.13 inches on May 25th 2018 and 0.66 of an inch on May 28th 2018. The National Weather Service recorded 10.80 inches for the month or 4.84 inches above the long term average of 5.96 inches. The total was the highest May rainfall total since 2012.

June: Weather charts indicate that an upper level trough interacted with a surface trough to produce an area of cloudiness and showers over the northwest Caribbean on June 12th 2018. The system produced an accumulation of 0.68 of an inch on June 12th 2018 as measured by the Cayman Islands National Weather Service at the Owen Roberts International Airport. The total measured accumulation of 2.34 inches for the month was 3.86 inches below the 30 year average for June of 6.20 inches.

July: Weather charts indicate that a tropical wave moved across the Cayman area on July 11th. The system produced an accumulation of 0.52 of an inch as measured by the Cayman Islands National Weather Service at the Owen Roberts International Airport. The measured accumulation of 1.2 inches for the month was 4.58 inches below the 30 year average for July of 5.78 inches.

August: Weather charts indicate that an upper level low pressure system produce an area of cloudiness and showers over the northwest Caribbean over the Cayman area on August 3rd 2018. The system produced an accumulation of 1.31 inches on August 3rd 2018 as measured by the Cayman Islands National Weather Service at the Owen Roberts International Airport. Weather charts indicate that an induced trough interacted produce cloudiness and showers over the Cayman area on August 12th 2018. The system produced an accumulation of 1.27 inches on August 12th 2018 as measured by the Cayman Islands National Weather Service at the Owen Roberts International Airport. Weather charts indicate that an upper level low pressure system produced cloudiness and showers over the Cayman area on August 20th 2018. The system produced an accumulation of 1.12 inches on August 20th 2018 as measured by the Cayman Islands National Weather Service at the Owen Roberts International Airport. Weather charts indicate that a tropical wave moved across the Cayman area on August 22nd 2018. The system produced an accumulation of 0.56 of an inch on August 22nd 2018 as measured by the Cayman Islands National Weather Service at the Owen Roberts International Airport. The total measured accumulation of 5.81 inches for the month or 0.09 of an inch below the 30 year average for August of 5.90 inches.

September: Weather charts indicate that a tropical wave and an upper level trough interacted to produced cloudiness and showers over the Cayman area on September 9/10 2018. The system produced an accumulation of 3.41 inches and 2.64 inches on September 9th and 10th 2018 respectively as measured by the Cayman Islands National Weather Service at the Owen Roberts International Airport. Weather charts indicate that an upper level trough produced cloudiness and showers over the Cayman area on September 13 2018. The system produced an accumulation of 1.98 inches on September 13th 2018 as measured by the Cayman Islands National Weather Service at the Owen Roberts International Airport. Weather charts indicate that the remnants of Tropical Storm Isaac produced cloudiness and showers over the Cayman area on September 17/18th 2018. The system produced an accumulation of 1.49 inches and 2.64 inches on September 17/18th 2018 respectively as measured by the Cayman Islands National Weather Service at the Owen Roberts International Airport. The total measured accumulation of 13.5 inches for the month was 4.76 inches higher than the 30 year average for September of 8.74 inches.

October: Weather charts indicate that an upper level trough produced cloudiness and showers over the Cayman area on October 02 2018. The system produced an accumulation of 0.62 of an inch on October 02nd 2018 as measured by the Cayman Islands National Weather Service at the Owen Roberts International Airport. Weather charts indicate that a low pressure system over the southwest Caribbean produced cloudiness and showers over the Cayman area on October 11 2018. The system produced an accumulation of 0.56 of an inch on October 11th 2018 as measured by the Cayman Islands National Weather Service at the Owen Roberts International Airport. Weather charts indicate that a high pressure system over the western Atlantic Ocean supported fresh northeast winds and rough seas from October 18-19th 2018. The Cayman Islands National Weather Service issued a marine warning for the system from October 18-19th 2018. Weather charts indicate that a high pressure system over the western Atlantic Ocean supported fresh northeast winds and rough seas from October 21-22nd 2018. The Cayman Islands National Weather Service issued a marine warning for the system from October 21-22nd 2018. The total measured accumulation of 3.12 inches for the month was 5.53 inches below the 30 year average for October of 8.65 inches. The total rainfall amount for 2018 through the end of October is 39.50 inches with a deficit of 7.86 inches (30 year average through October is 47.36 inches).

November: Weather charts indicate that a tropical wave moved across the Cayman area on November 5th 2018. The system produced an accumulation of 0.98 of an inch on November 5th as measured by the Cayman Islands National Weather Service at the Owen Roberts International Airport. Weather charts indicate that a high pressure system over the southern USA supported fresh northeast winds and rough seas from November 11-12th 2018. The Cayman Islands National Weather Service issued a marine warning for the system for the period. 28-30 Weather charts indicate that a cold front moved across the Cayman area on November 28th 2018. The system supported fresh northeast winds and rough seas from November 28-30th 2018. The Cayman Islands National Weather Service issued a marine advisory for the system for the period. The total measured accumulation of 2.39 of an inch is 3.66 inches below the 30 year average for November of 6.05 inches.

December: Weather charts indicate that a strong cold front moved across the Cayman area on December 21st 2018. The system supported fresh to strong northwest winds and very rough seas from December 20-31st 2018. The Cayman Islands National Weather Service issued marine warnings for the system for the period. The Port and west coast of Grand Cayman was battered by large waves resulting in flooding of the main roads leading to road closures along portions of the capital. The total measured accumulation of 1.56 inches is 1.23 inches below the 30 year average for December of 2.79 inches.