|Type of posting||Posting date(EST):||Summary||Downloads|
|Event Summary||9/28/2021 11:45:00 AM|
Event Summary | Summary
Posting Date: September 28, 2021, 11:45:00 AM
AIR is monitoring Hurricane Sam, located at 17.5°N 54.3°W, with maximum sustained winds of 130 mph and a central pressure of 952 mb, as of 11 a.m. AST. Sam is moving northwest at 8 mph.
NHC Forecast Track and Intensity
Hurricane Sam is not forecast to make landfall during the next five days. Air Force Reserve Hurricane Hunters investigated Sam early this morning and found evidence that the hurricane has strengthened. Satellite data also indicate that Sam's structure has improved overnight. The warm sea-surface temperatures and weak to moderate vertical wind shear along Sam's forecast track suggest the storm should remain a major hurricane for the next several days. Thus, the NHC forecast only shows gradual weakening through the next 72 hours or so. In four to five days, increasing southerly wind shear along with decreasing SSTs should increase Sam's rate of weakening as it recurves deeper into the mid-latitudes. A mid- to upper-level trough is forecast to dig southward over the western Atlantic later this week, which should steer Sam toward the north by Friday. Then, Sam is expected to accelerate north-northeastward within the deep-layer southerly flow ahead of the trough this weekend.
NHC Forecast Hazards
Large swells generated by Sam are affecting the Leeward Islands and will spread to portions of the Virgin Islands, Puerto Rico, Hispaniola, the Bahamas, and Bermuda by Thursday or Friday. Significant swells will likely reach the east coast of the United States and Atlantic Canada by the weekend.