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NOUS41 KWBC 291820
PNSWSH
Public Information Statement 22-17
National Weather Service Headquarters Silver Spring MD
220 PM EST Tue Mar 29 2022
To: Subscribers:
-NOAA Weather Wire Service
-Emergency Manager Weather Information Network
-NOAAPORT
Other NWS Partners And Employees
From: Michelle Mainelli, Acting Director
Office of Observations
Subject: Changes in Weather Balloon Launch Frequency Effective March
29,
2022
Effective March 29 and until further notice, the National Weather
Service
is reducing the frequency of weather balloon launches at several
upper air
locations in the United States due to a global supply chain
disruption of
helium and a temporary issue with the contract of one hydrogen
supplier.
The National Weather Service launches weather balloons from 101 upper
air
sites throughout the United States and the Caribbean, using helium to
inflate the balloons at 12 of these sites. The agency converted the
remaining sites to hydrogen because it is cost effective and a more
reliable gas option.
Approximately 9% of the total upper air sites are currently affected
by
the gas shortage and temporary contract issue, including 5 of the 12
helium sites and 4 hydrogen sites. We anticipate that these issues
will
impact additional upper air sites. To ensure there is enough gas
on-hand
to launch balloons in support of forecasts during hazardous weather,
the
affected sites have either reduced launches to once per day or
suspended
flights during calm weather days. This temporary adjustment will not
impact weather forecasts and warnings.The affected sites benefit from
data
collected by balloons launched from neighboring upper air sites. Be
assured we will take all steps possible to mitigate the supply chain
and
contracting issues.
Radiosondes are instruments attached to weather balloons that send
back a
wide range of upper atmospheric data to support weather forecasts,
including temperature, dew point, relative humidity, barometric
pressure,
wind speed, wind direction. Radiosondes are one of many technologies
that
collect earth observation data for use in weather modeling and
forecasting. Data is also collected from instruments aboard
commercial
aircraft, surface observing stations, satellites, radars, and buoys.
The National Weather Service will continue converting sites to
hydrogen
where locations, leases and safe operations allow, and as funding
becomes
available.
If you or your organization have any questions about these changes,
please
contact:
Susan Buchanan
Director of Public Affairs
National Weather Service
Phone: 202-834-5235
E-mail:
[email protected]
National Service Change Notices are online at:
https://www.weather.gov/notification/