Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Station density for each state listed in upper left-hand corner: Maine (ME), New Hampshire (NH), Vermont (VT), Massachusetts (MA), Connecticut (CT), Rhode Island (RI), New York (NY) and northern portions of Pennsylvania (PA) and New Jersey (NJ). Stations are assigned unique identifications listed in Table S1.
