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SRAK48 PACR 311523
ACRRVAAK
AKZALL-202300-
ALASKA SPRING BREAKUP SUMMARY
NWS ALASKA PACIFIC RIVER FORECAST CENTER ANCHORAGE AK
300 PM ADT SUN MAY 31 2009
...SPRING BREAKUP SUMMARY FOR ALASKA...
FLOOD WARNING/WATCHES:
NONE IN EFFECT AT THIS TIME
******NOTE THAT THIS WILL BE THE LAST SPRING BREAKUP
SUMMARY ISSUED FOR THE 2009 BREAKUP SEASON******
*********************************************************************
*EVEN THOUGH A PARTICULAR RIVER OR REACH MAY BE DESCRIBED AS MOSTLY *
*OPEN OR OPEN... IT IS STILL POSSIBLE FOR RUNS OF ICE AND DEBRIS TO *
*MOVE THROUGH AS HEADWATERS UPSTREAM BREAKUP. PLEASE USE CAUTION AT*
*ALL TIMES WHEN ATTEMPTING TO NAVIGATE RIVERS. *
*********************************************************************
RECENT BREAKUP ACTIVITY:
TANANA RIVER...
BREAKUP ON THE TANANA RIVER IS COMPLETE.
KUSKOKWIM RIVER...
BREAKUP ON THE KUSKOKWIM RIVER IS COMPLETE.
KOYUKUK RIVER...
BREAKUP ON THE KOYUKUK RIVER IS COMPLETE.
YUKON RIVER...
THERE IS VERY LITTLE ICE LEFT IN THE YUKON RIVER. HIGH WATER LEVELS
WILL CONTINUE ON THE LOWER YUKON RIVER DUE TO THE EXTENSIVE OVERBANK
FLOODING THIS YEAR. HOWEVER NO ADDITIONAL FLOODING RELATED TO
BREAKUP IS EXPECTED.
COPPER RIVER...
AS OF MAY 30 TANGLE LAKES AND PAXSON LAKE WERE ABOUT 50 PERCENT ICE
COVERED. MEYERS LAKE WAS OPEN.
SUSITNA RIVER...
THE SUSITNA RIVER IS REPORTED TO BE OPEN.
NORTHWEST ALASKA...
BASED ON PILOT REPORTS FROM SEVERAL DAYS AGO.. THE KOBUK WAS OPEN
EXCEPT POSSIBLY THE EXTREME LOWER END AT THE MOUTH. THE SELAWIK RIVER
WAS ALL OPEN WITH A FEW LIGHT RUNS OF ICE. SELAWIK LAKE WAS RISING
AND WAS STILL COVERED WITH ROTTING ICE. A SATELLITE IMAGE ON MAY 30
SHOWS THE NORTHEAST CORNER OF SELAWIK LAKE TO BE OPEN AS WELL AS THE
NORTHWEST CORNER OF INLAND LAKE. THE SATELLITE IMAGE SHOWS THAT THE
BUCKLAND RIVER HAS CAUSED AN OPEN LEAD TO DEVELOP IN ESCHSCHOLTZ BAY.
A PILOT REPORT ON SUNDAY MAY 24 NOTES THE LOWER NOATAK RIVER WAS OPEN
WITH JUST A VERY LIGHT CHUNK ICE RUN NEAR THE MOUTH. LITTLE
INFORMATION IS AVAILABLE ON THE UPPER NOATAK. AUFEIS DEVELOPMENT MAY
REMAIN IN SOME STREAMS DRAINING THE BROOKS RANGE.
NORTH SLOPE...
FLOW IN THE COLVILLE RIVER CRESTED AND HAS FALLEN OVER 6 FEET FROM
THE CREST. WARMER WEATHER IS EXPECTED TO CAUSE IT AND OTHER NORTH
SLOPE STREAMS TO BEGIN ANOTHER RISE DUE TO MELTING SNOW. SATELLITE
IMAGES SHOW THAT AUFEIS DEVELOPMENT REMAINS ON SOME NORTH SLOPE
STREAMS.
THE FOLLOWING TABLE GIVES AN ESTIMATION OF FLOOD POTENTIAL FOR
VARIOUS LOCATIONS AROUND THE STATE AND BASIN RUNOFF VOLUMES.
---------------------------------------------------------------------
SNOWMELT RUNOFF VOLUME...EXPECTED WATER VOLUME FROM SNOWMELT DURING
THE MELT SEASON.
FLOOD POTENTIAL...THE LIKELIHOOD OF FLOODING FROM SNOWMELT AND/OR
ICE JAMS.
* AVERAGE BREAKUP DATES ARE FOR THE PERIOD 1970 THROUGH 2008 AND ARE
CALCULATED FOR LOCATIONS WITH AT LEAST 5 YEARS OF DATA.
** ACTUAL BREAKUP DATE FOR 2009
---------------------------------------------------------------------
SNOWMELT FLOOD AVERAGE NO. OF FORECAST
RIVER - REACH RUNOFF POTENTIAL BREAKUP YEARS BREAKUP
VOLUME DATE * RECORD DATE
------------- ---------- --------- ------- ------ --------
SOUTHEAST PANHANDLE ABOVE
KENAI RIVER BELOW
ANCHOR RIVER BELOW
MATANUSKA RIVER AVERAGE
SUSITNA RIVER AVERAGE
GOLD CREEK LOW
SUNSHINE LOW 05/03 19 5/04**
YENTNA RIVER AVERAGE
LAKE CREEK LOW 04/30 18 4/30**
SKWENTNA RIVER AVERAGE
SKWENTNA LOW 04/30 15 4/30**
COPPER RIVER BASIN AVERAGE
GAKONA RVR @ HWY LOW 04/30 23 ~4/30**
GULKANA RVR @ HWY LOW 04/29 21 ~4/30**
CHENA RIVER AVERAGE
CHENA LAKES PROJECT LOW
FAIRBANKS LOW 04/25 23 4/30**
TANANA RIVER AVERAGE
NORTHWAY LOW 04/23 23 4/27**
SALCHA LOW
FAIRBANKS LOW 04/30 11 5/02**
NENANA LOW 05/02 35 5/01**
MANLEY LOW 05/03 17 5/03**
KUSKOKWIM RIVER ABOVE
NIKOLAI LOW 04/23 24 4/25**
MCGRATH LOW 05/07 35 5/04**
STONY RIVER LOW 05/06 21 5/02**
SLEETMUTE LOW 05/05 20 5/02**
RED DEVIL LOW 05/06 23 5/03**
CROOKED CREEK LOW 05/07 23 5/03**
ANIAK LOW 05/07 26 5/03**
KALSKAG LOW 05/07 20 5/07**
TULUKSAK LOW 05/09 17 5/07**
AKIAK LOW 05/10 23 5/08**
KWETHLUK LOW
BETHEL LOW 05/12 38 5/09**
NAPAKIAK LOW 05/12 15 5/11**
YUKON RIVER (UPPER) ABOVE
DAWSON, YT 05/06 39 5/04**
EAGLE LOW 05/05 29 5/03**
CIRCLE LOW 05/09 27 5/06**
FORT YUKON LOW 05/10 26 5/08**
BEAVER LOW 05/11 14 5/09**
STEVENS VILLAGE LOW 05/12 14 5/09**
RAMPART LOW 05/13 15 5/10**
YUKON RIVER (MIDDLE) ABOVE
TANANA LOW 05/10 24 5/10**
RUBY LOW 05/12 25 5/11**
GALENA LOW 05/12 26 5/11**
KOYUKUK LOW
NULATO LOW 05/13 13 5/11**
KALTAG LOW 05/14 33 5/12**
ANVIK LOW 05/17 22 5/13**
YUKON RIVER (LOWER) ABOVE
HOLY CROSS LOW 05/16 22 5/13**
RUSSIAN MISSION LOW 05/15 24 5/17**
MARSHALL LOW
PILOT STATION LOW 05/17 12 5/17**
MOUNTAIN VILLAGE LOW 05/18 22 5/22**
ALAKANUK/EMMONAK LOW 05/22 26 5/23**
KOYUKUK RIVER ABOVE
BETTLES LOW 05/10 27 5/02**
ALLAKAKET LOW 05/11 22 5/03**
HUGHES LOW 05/11 21 5/04**
SEWARD PENINSULA ABOVE
BUCKLAND RIVER ABOVE
BUCKLAND LOW 05/18 18 5/13**
KOBUK RIVER ABOVE
KOBUK LOW 05/16 29 5/13**
SHUNGNAK LOW 05/18 19 5/13**
AMBLER LOW 05/18 26 5/16**
NOATAK RIVER ABOVE
NOATAK LOW 05/20 14 5/18**
BROOKS RANGE - NORTH BELOW
COLVILLE @ UMIAT LOW 05/25 11 5/18**
COLVILLE @ COLVILLE LOW 05/31 11 5/27**
FOR MORE DETAIL AND TO SEE A FLOOD POTENTIAL MAP REFER TO OUR WEB
SITE AT HTTP://APRFC.ARH.NOAA.GOV.
THE IS THE LAST ISSUANCE OF THE SPRING BREAKUP SUMMARY FOR 2009.
$$
LAR
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