Hurricane Adrian (2011)

[7] Based on the improved appearance on satellite imagery, it is estimated the depression intensified into Tropical Storm Adrian at 0000 UTC on June 8, twelve hours after formation.

[9] By nightfall, the eye-like feature developed into a central dense overcast (CDO), and at around 0000 UTC on June 9, the NHC upgraded Adrian to a minimal hurricane as it attained sustained winds of 80 mph (130 km/h).

[1][10] Later that day, a well-defined eye formed beneath the CDO and the surrounding cloud tops reached below −80 °C (−112 °F), indicating intensification is present.

[14] Throughout most of June 9, Adrian began transitioning into an annular hurricane, displaying a large and circular eye around 25 miles (40 km) in diameter, devoid of any convective banding.

[15] Contrary to previous predictions by the NHC, Adrian continued to intensify, reaching its peak intensity at around 0000 UTC on June 10 while located about 320 mi (515 km) south-southwest of Manzanillo, Mexico.

[17] By then, Adrian also began moving into a more stable environment with stronger westerly wind shear, which is highly unfavorable for the sustaining tropical cyclones.

[19] Steered by a low-to-mid-level ridge over the northeastern Pacific, Adrian recurved to the west, traversing sea surface temperatures cooler than 26.5 °C (79.7 °F).

[19][20] Deteriorating faster than anticipated due to an unexpected increase in wind shear, Adrian weakened back into a tropical storm around 1800 UTC on June 11.

[23] Weakening resumed and Adrian degenerated into a tropical depression six hours later,[24] and subsequently decaying into a remnant low-pressure area at around 1200 UTC on June 12 while located about 585 mi (940 km) southwest of the southernmost tip of Baja California peninsula.

[1][25][26] Devoid of any convection, the remnant low of Adrian continued to move west for roughly two days, until gradual dissipation, as the low-level circulation opened up into a surface though.

[29] Plumes of moisture from the outer rainbands of Adrian caused heavy rain in the Mexican states of Oaxaca, Guerrero and Michoacán.

Map plotting the storm's track and intensity, according to the Saffir–Simpson scale
Map key
Tropical depression (≤38 mph, ≤62 km/h)
Tropical storm (39–73 mph, 63–118 km/h)
Category 1 (74–95 mph, 119–153 km/h)
Category 2 (96–110 mph, 154–177 km/h)
Category 3 (111–129 mph, 178–208 km/h)
Category 4 (130–156 mph, 209–251 km/h)
Category 5 (≥157 mph, ≥252 km/h)
Unknown
Storm type
triangle Extratropical cyclone , remnant low, tropical disturbance, or monsoon depression
Hurricane Adrian at peak intensity on June 10, while transitioning to an annular hurricane