Hurricanes and Tropical Storms - May 2007

Atlantic Basin

Subtropical Storm Andrea
Subtropical Storm Andrea Satellite Image
Subtropical Storm Andrea Track
Subtropical Storm Andrea Track

Subtropical storm Andrea developed off the southeastern coast of the United States on the 9th, prior to the official Atlantic hurricane season (June 1st) becoming the first named storm in May since 1981. Andrea had maximum sustained winds of 65 km/hr (35 knots or 40 mph) and immediately weakened to a depression on the 10th (Associated Press/CNN News). Storms that occur prior to the official start of the hurricane season are not uncommon. As recently as 2003 a tropical storm developed earlier in the season when Tropical Storm Ana formed on April 22nd. More information on Andrea is available from the NOAA National Hurricane Center.

Pacific Basin

The eastern North Pacific hurricane season officially begins on May 15th, generally peaks in late August/early September and concludes around the end of November. Tropical cyclone activity during May was above average with two named storms, Alvin and Barbara. Since official records began in 1949, two tropical storms have developed in May in 1984 and 1956. The long-term mean indicates that a named storm typically forms about every other May. However, this is the 8th consecutive May that a tropical cyclone has developed in the East Pacific Basin.
Tropical Storm Alvin
Tropical Storm Alvin Satellite Image
Tropical Storm Alvin Track
Tropical Storm Alvin Track Map
Alvin generated from a tropical wave that entered the East Pacific Basin on 18 May. The wave moved westward during the next several days without much development. On 24 May, a broad area of low pressure developed along the wave about 550 miles south-southwest of Manzanillo, Mexico. The system acquired enough organization to be classified as a tropical depression on 27 May, while centered about 625 miles southwest of Manzanillo. The depression became a minimal tropical storm on 29 May and moved slowly westward during its entire existence. Alvin did not intensify further and weakened to a tropical depression on 30 May. It degenerated into a remnant low on 31 May about 800 miles south-southwest of the southern tip of the Baja Peninsula. More information may be found on NCDC's 2007 Northeast Pacific Tropical Cyclone statistics page or at the NOAA National Hurricane Center.

Tropical Storm Barbara
Tropical Storm Barbara Satellite Image
Tropical Storm Barbara Track
Tropical Storm Barbara Track Map
Barbara originated from a slow-moving tropical wave that moved off the coast of Central America on 24 May. The wave produced disorganized showers and thunderstorms during the next couple of days. On 28 May, a small area of low pressure formed a couple hundred miles southwest of the Gulf of Tehuantepec as the wave interacted with the ITCZ. Thunderstorm activity became better organized near the low and a tropical depression developed on 29 May about 125 miles southwest of Puerto Angel, Mexico. The depression moved slowly southeastward and became a tropical storm the next day. At the end of the month, Barbara was located about 200 miles south-southeast of Puerto Angel, Mexico. More information may be found on NCDC's 2007 Northeast Pacific Tropical Cyclone statistics page or at the NOAA National Hurricane Center.

Citing This Report

NOAA National Centers for Environmental Information, State of the Climate: Hurricanes and Tropical Storms for May 2007, published online June 2007, retrieved on September 17, 2019 from