[EAS] Updating maps of EAS operational areas

[Sean Donelan]

Since the U.S. Census Bureau has released updated FIPS/TIGER shapefiles 
from the latest census, I though I would update my national map of EAS 
Operational Areas.

I've identified 504 EAS operational areas.

https://www.donelan.com/easmaps/index.html

The Census Bureau made a few adjustments to FIPS codes and 
county/county-equivalents during the last 10 years.  Most changes were in 
Alaska, but also in Louisiana, South Dakota, and Virginia. NWS also made a 
few adjustments to the Marine EAS boundaries and names.

https://www.census.gov/programs-surveys/geography/technical-documentation/county-changes.2010.html

Forrtunately, EAS operational areas rarely change.  Have any SECCs made 
changes to the boundaries of their EAS operational areas since 2017? 
There are 25 counties/county-equivalents split between EAS operational 
areas.  Did I miss any?

25 Split EAS counties/county-equivalents

Aleutians East Borough	AK
Bethel Census Area	AK
Copper River Census Area	AK
Chugach Census Area	AK
Yakutat City and Borough	AK
Yukon-Koyukuk Census Area	AK
Alpine County	CA
El Dorado County	CA
Inyo County	CA
Modoc County	CA
Nevada County	CA
Placer County	CA
Plumas County	CA
Riverside County	CA
San Bernardino County	CA
Sierra County	CA
Penobscot County	ME
Essex County	MA
Middlesex County	MA
Norfolk County	MA
Plymouth County	MA
Ocean County	NJ
Douglas County	OR
Clallam County	WA
Jefferson County	WA

I also found maps of the original CONELRAD zones, but never found any 
old Emergency Broadcast System (EBS) maps. They seem to have been lost in 
the mysts of time.