overview of the 2013 river watchleoimages.blob.core.windows.net/hubfiles/alaska/22... · because...
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George CoyleEmergency Management Specialist
Alaska Division of Homeland Security & Emergency Management
907‐428‐7100Or Toll Free at 1‐800‐478‐2337
May, 2013
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What is River Watch?
Each year, the State of Alaska Division of Homeland Security and Emergency Management (DHS&EM) and
the National Weather Service (NWS) separately fund a joint program to provide advance and emergency
notification of imminent snowmelt and ice jam flooding to 76 Alaska villages, boroughs, and tribal
councils. This program is known as River Watch.
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Why the River Watch Program Exists•
To reduce the impact to communities from ice jam
flooding.
•
To inform communities of threats and provide them with ways to protect themselves.
•
Because significant flooding in major river systems is not new to Alaska. Since 1977, flooding caused by ice jams has occurred 24 times.
•
And since 1978, the State of Alaska has spent over 98 million dollars in assistance due to ice jam flooding.
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Field Observations
The primary source of
river stage and ice jam conditions is provided by
village observers and local pilots.
NWS contacts observers in several river villages for
daily reports. These reports are also provided
to DHS&EM for planning.
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NWS Weather Projections
Based on village reports,
river stage gauge data, and climate modeling, the NWS issues regular projections.
DHS&EM monitors two
main projection: river ice conditions (top right) and statewide weather and flood
information (bottom right).
Portions of the State with
significant weather are color‐coded to assign the
appropriate threat level.
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How Does the River Watch Field Program Begin?
Once ice deterioration begins, personnel from
DHS&EM and APRFC normally deploy to monitor the rivers, prepare communities, warn of impending
flooding and advise community leaders on emergency management issues.
Two field teams are normally deployed:
The Yukon River team is based initially out of Fort Yukon, Circle, or Fairbanks, and moves downriver to
Galena then to St. Mary’s as the river breaks up.
The Kuskokwim River team is based initially out of McGrath or Aniak, and ends up in Bethel if necessary.
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Which Rivers are Flown?
•
ALWAYS ‐
Yukon and Kuskokwim Rivers. These two river systems are normally flown to some degree each year because they together have the highest percentage
(63%) and greatest likelihood for ice jam flooding, and because potentially dangerous conditions may develop and go unnoticed due to the vast uninhabited areas
which separate the river communities).•
SOMETIMES ‐
Tanana, Koyokuk, Chena, and their
tributaries. These river systems are normally monitored from Anchorage and/or Fairbanks unless
local observations or NWS projections identify a flood threat.
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Staging Locations
Beaver
Koyukuk
Ruby
Galena
FairbanksTanana
Rampart
StevensVillage
Eagle
Circle
Ft Yukon
Hughes
Holy Cross
RussianMission
St MarysMt.Village
AlakanukEmmonak
Grayling
Kaltag
Tazlina
GlennallenGulkana
Northway
TanacrossBig Delta
Shungnak
Buckland
Noatak
Kwethluk
Bethel Tuluksak
Aniak
Crooked Creek
Red Devil
Stony River
McGrath Nikolai
Anvik
Kalskag
Yentna
Skwentna
Nenana
Sunshine
Napakiak
AmblerChalkyitsik
Allakaket
Huslia
Kotzebue
Primary Staging
Secondary Staging
KobukBettles
PilotStation
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Contact with the Local Community
When not in the air, the teams
visit communities to provide face‐to‐face contact, compare current river ice information
with historical accounts, and advise local officials on ways to lessen future damages
should flooding continue.
Whenever a risk arises,
warnings and other information are provided to
the community via local marine‐band radio or through
public radio interviews.
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Kwethluk Kwethluk May 2005May 2005
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Eagle 2009
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To Follow River Watch or Report an Observation
Log on to: http://aprfc.arh.noaa.gov/
Or
www.ready.alaska.gov
You can call the APRFC at 1‐800‐847‐1739
to report ice conditions
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Any Questions about River Watch?