Tropical Storm Eta strengthened over the Caribbean Sea east of Nicaragua on Sunday afternoon. At 4:00 p.m. EST on Sunday the center of Tropical Storm Eta was located at latitude 14.9°N and longitude 78.9°W which put it about 285 miles (460 km) east of Cabo Gracias a Dios. Eta was moving toward the west at 15 m.p.h. (24 km/h). The maximum sustained wind speed was 65 m.p.h. (105 km/h) and there were wind gusts to 80 m.p.h. (130 km/h). The minimum surface pressure was 992 mb.

A Hurricane Warning was in effect for the portion of the coast from Sandy Bay Sirpi, Nicaragua to the Honduras/Nicaragua border. A Hurricane Watch was in effect for the portion of the coast from the Honduras/Nicaragua border to Punta Patuca, Honduras. A Tropical Storm Warning was in effect for the portion of the coast from the Honduras/Nicaragua border to Punta Patuca, Honduras. A Tropical Storm Watch was issued for the portion of the coast from Punta Patuca to Punta Castilla, Honduras.

A NOAA aircraft found that Tropical Storm Eta had strengthened on Sunday afternoon. Thunderstorms near the center of Eta generated upper level divergence which pumped mass away from the tropical storm. The removal of mass allowed the surface pressure to decrease, which contributed to an increase in the wind speed. Bands of showers and thunderstorms were revolving around the core of Tropical Storm Eta. Winds to tropical storm force extended out 140 miles (220 km) from the center of the tropical storm.

Tropical Storm Eta will move through an environment favorable for intensification during the next 24 hours. Eta will move over water where the Sea Surface Temperature is near 29°C. It will move through a region where the upper level winds are weak and there will be little vertical wind shear. Tropical Storm Eta could intensify into a hurricane within 12 hours. Eta could intensify rapidly once an inner core if fully developed. There is a chance that Eta could strengthen into a major hurricane.

Tropical Storm Eta will move south of a ridge of high pressure over the western Atlantic Ocean. The ridge will steer Eta toward the west during the next couple of days. On its anticipated path Tropical Storm Eta could approach the coast of Nicaragua on Monday night. Eta could be a major hurricane when it reaches Nicaragua. The steering currents will weaken when Eta nears Nicaragua. Eta will move slowly when that happens and it could drop very heavy rain over Nicaragua and Honduras. Catastrophic flash floods could occur in that region.