Tropical Storm Pilar Swings Away From Central America After Flooding Coast
Tropical Storm Pilar formed in the eastern Pacific on 28 October 2023. The storm reached peak intensity on 1 November with maximum sustained winds of 55 knots. Pilar remained offshore and did not make landfall. Heavy rainfall from the storm caused flooding and two deaths across Central America.
East-Northeast Drift Brings Pilar Toward El Salvador; Steering Collapse Leaves Storm Stalled Offshore
Tropical Storm Pilar developed from a broad area of low pressure that organized over the eastern Pacific in late October 2023. The disturbance was associated with a tropical wave that moved westward into the basin after passing through the Caribbean and Central America. By 28 October at 1200 UTC, a tropical depression formed about 250 nautical miles southwest of San Salvador, El Salvador, with maximum sustained winds of 30 knots and a central pressure of 1005 mb.
The newly formed depression moved little during its first day as weak steering currents dominated the region. A weakened ridge to the north and changing atmospheric patterns left the system nearly stationary over warm eastern Pacific waters. During this period, satellite imagery showed persistent convection, while surface observations indicated that the circulation gradually became better organized.
Late on 29 October, a deep-layer trough over the northwestern Caribbean Sea and an enhanced equatorial ridge to the south helped shift the system toward an east-northeastward track. This movement brought Pilar closer to the Pacific coast of Central America, including El Salvador, Honduras, and Nicaragua. Increasing convection near the center allowed the system to strengthen into a tropical storm around 0000 UTC on 30 October, when it was located about 220 nautical miles west-southwest of San Salvador.
Pilar intensified gradually over the following days while remaining offshore. Wind shear restricted rapid organization, but improved convective structure allowed the storm to maintain tropical storm status. By late October, coastal areas of Central America were affected by increasing moisture flow and rainfall associated with the storm’s outer bands.
The storm’s offshore position reduced the threat of direct wind damage, but its slow movement near Central America increased concerns about rainfall accumulation. Mountainous terrain and saturated river basins across the region created conditions favorable for flooding as Pilar passed nearby.
Pilar Peaks at 55 Knots 80 Miles Offshore; Rain Bands Trigger Deadly Flooding Across Region
Pilar reached its strongest intensity around 0000 to 0600 UTC on 1 November while located approximately 80 nautical miles offshore of El Salvador. The storm had maximum sustained winds of 55 knots and a minimum central pressure of 995 mb, according to the final tropical cyclone analysis. At peak strength, Pilar remained below hurricane intensity but maintained a compact tropical storm circulation near the Central American coastline.
The storm produced heavy rainfall across parts of Central America as moisture bands moved inland. El Salvador recorded the most significant impacts, with flooding reported in several areas. Two deaths were attributed to the storm’s rainfall-related effects, while emergency agencies monitored vulnerable communities for additional flood hazards.
Pilar’s rainfall impact extended beyond the immediate coastal zone. Areas near rivers, low-lying communities, and mountainous terrain faced increased risks from rapid water rises and localized flooding. The storm demonstrated that tropical systems without landfall can still create dangerous conditions through prolonged rainfall and moisture transport.
Marine conditions also deteriorated across offshore waters near Central America. Tropical storm-force winds, rough seas, and heavy showers affected maritime activities in the eastern Pacific, particularly near waters south of El Salvador and Nicaragua.
After reaching its first peak, Pilar began to weaken as atmospheric conditions changed around the system. A cold front approaching from the northwestern Caribbean Sea influenced the steering pattern, while a mid-level ridge redirected the storm’s movement away from the coast.
Cold Front Reshapes Steering Flow; Pilar Reverses Course and Retreats Westward
The interaction between Pilar and the larger atmospheric pattern produced a sharp change in track. Instead of moving farther toward Central America, the storm turned northward and then westward while remaining offshore. This unusual movement kept Pilar from making landfall along the Pacific coast.
During the westward turn on 2 November, Pilar maintained tropical storm intensity while moving rapidly southwestward over the eastern Pacific. High-resolution wind observations indicated that the storm briefly strengthened again while interacting with a larger-scale gap wind pattern south-southwest of the Gulf of Tehuantepec.
The storm’s intensity during this period remained near 55 knots, with a central pressure near 996 mb. However, increasing dry air intrusion limited further organization. Pilar continued moving westward over warm ocean waters, but the surrounding environment gradually became less supportive of a sustained tropical circulation.
By 3 November, Pilar weakened to around 45 knots as dry air affected the circulation. The storm remained a tropical storm on 4 November while located well offshore, with winds near 40 knots and a central pressure of 1002 mb according to the National Hurricane Center advisory data.
Although Pilar no longer posed a direct coastal wind threat, its earlier rainfall effects continued to shape the storm’s regional impact record. The event highlighted how landfall is not required for a tropical system to produce hazardous conditions.
Dry Air and Shear Erode the Cyclone; Pilar Dissipates as Remnant Low on Nov 5
Pilar weakened further on 5 November as increasing southwesterly wind shear disrupted the circulation. The storm lost its organized tropical structure while moving westward across the eastern Pacific Ocean. By this stage, maximum sustained winds had decreased to around 35 knots, with the central pressure rising to approximately 1004 mb.
The system transitioned into a post-tropical cyclone on 5 November after losing the characteristics required to remain a tropical cyclone. Pilar’s remnants continued moving across the Pacific before weakening further over open waters.
The final track of Tropical Storm Pilar began near 10.4°N, 92.6°W on 28 October 2023 and ended after dissipation near 10.7°N, 114.8°W on 5 November 2023. The storm’s strongest analyzed intensity was 55 knots with a minimum pressure of 995 mb on 1 November 2023.