Early on May 28, Alberto reached its peak intensity, with maximum sustained winds of 65 mph (100 km/h) and a minimum pressure of 990 mbar (hPa; 29.23 inHg).

Afterward, however, dry air caused Alberto to weaken before it made landfall near Laguna Beach, Florida, with winds of 45 mph (75 km/h).

Alberto maintained a compact area of thunderstorms as it progressed through the central United States, entering southern Michigan as a tropical depression on May 31.

The storm caused coastal flooding along the United States Gulf Coast, most significantly in Florida where it moved ashore.

By May 20, the trough had rotated into a northwest–southeast orientation, which increased diffluence and contributed to the formation of a broad low pressure area over the northwest Caribbean.

[2] On May 23, the low moved over the eastern Yucatán Peninsula,[1] where its development was impeded due to strong wind shear and dry air.

That day, the NHC designated the system as a subtropical depression while it was located about 80 mi (130 km) east-northeast of Chetumal, Quintana Roo.

The subtropical designation was due to the depression's interaction with an upper-level low, as well as its broad wind field, with multiple low-level circulations evident.

[1] While near its maximum intensity, Alberto moved slowly around the northern side of an upper-level low, and the intrusion of drier air into the circulation caused the thunderstorms to weaken.

Tropical Storm Alberto made landfall near Laguna Beach, Florida at 21:00 UTC on May 29 with sustained winds of 45 mph (75 km/h).

[1][9] Alberto quickly weakened to a tropical depression as it moved inland, although it maintained an area of thunderstorms over a well-defined center.

[10] On May 30, an approaching trough turned the system northeastward, and Alberto entered southern Michigan as a tropical depression the following day.

[1] Multiple tropical storm watches and warnings were issued across the Gulf Coast of the United States in preparation for Alberto's arrival.

[12] In the Gulf of Mexico, oil companies Exxon Mobil Corp, Royal Dutch Shell and Chevron Corporation evacuated workers and shut down production platforms in Alberto's path.

[14] During its formative stages, Alberto also dropped heavy rainfall across much of western Cuba, peaking at 14.41 inches (366 mm) in Heriberto Duquezne, Villa Clara.

At least 7 in (180 mm) of rainfall fell in Pinar del Rio, Artemisa, Matanzas, Cienfuegos, Sancti Spíritus and Ciego de Avila provinces.

[1] Storm surge and abnormally high tides caused coastal flooding on Isla de la Juventud, and from Pinar del Río to Mayabeque Province.

[17] Floodwaters inundated numerous streets, including Autopista A1 in Villa Clara Province, forcing authorities to close the road.

[1] WYFF News 4 anchor Mike McCormick and photojournalist Aaron Smeltzer died while covering the storm after a tree fell onto their vehicle on U.S. Route 176.

[24] In Port Salerno far from the storm's landfall, Alberto's outer rainbands spawned a brief EF0 tornado, which lifted a trampoline into nearby power lines.