Hydrometeorological Discussion
Issued by NWS Alaska-Pacific RFC

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14
000
AGAK78 PACR 232254
HMDACR

HYDROMETEOROLOGICAL DISCUSSION
NWS ALASKA PACIFIC RIVER FORECAST CENTER ANCHORAGE AK
300 PM AKDT SUN JUL 23 2017

...FLOOD POTENTIAL...

A SMALL STREAM FLOOD ADVISORY FOR RAPID RISES ON SMALL STREAMS
DRAINING THE NORTHWEST BROOKS RANGE IS IN EFFECT UNTIL 5:30 PM AKDT
MONDAY, JULY 24.

A SMALL STREAM FLOOD ADVISORY FOR RAPID RISES ON SMALL STREAMS
DRAINING THE INTERIOR AND SOUTHERN SEWARD PENINSULA IS IN EFFECT
UNTIL 2:30 PM AKDT MONDAY, JULY 24.

RECENT AND FORECAST RAIN MAY LEAD TO RAPID RISES ON AFFECTED
NORTHERN BROOKS RANGE AND NORTH SLOPE RIVERS AND STREAMS EAST OF THE
COLVILLE RIVER THROUGH THE EARLY PART OF THE WEEK.

THE FLOOD POTENTIAL IS CURRENTLY LOW FOR THE REST OF ALASKA.

...HYDROMETEOROLOGICAL DISCUSSION....

THE 500 MB PATTERN THIS MORNING HAS THE OLD GULF LOW IN BRITISH
COLUMBIA AND CONTINUING OFF TO THE EAST... ANOTHER LOW IN THE NORTH
PACIFIC SOUTH OF THE WESTERN GULF... AN EAST-WEST RIDGE ACROSS THE
SOUTHERN MAINLAND AND SOUTHERN YUKON TERRITORY... AND A ANOTHER
DISTURBANCE IN THE EAST SIBERIAN SEA WITH A FRONT AND ASSOCIATED
RAIN OVER THE NORTHWEST MAINLAND.  THIS NORTHERN DISTURBANCE IS
BRINGING MODERATE TO HEAVY RAIN TO SOME PORTIONS OF THE SEWARD
PENINSULA AND THE WESTERN BROOKS RANGE TODAY.

OVER THE NEXT COUPLE OF DAYS THE NORTHERN DISTURBANCE WILL MOVE EAST
ACROSS THE NORTH SLOPE... EVENTUALLY BRINGING RAIN TO MOST OF THE
MAINLAND TODAY THROUGH MONDAY.  ADDITIONAL DISTURBANCES ARE POISED
TO MOVE INTO THE WESTERN MAINLAND LATE MONDAY INTO TUESDAY.  TO THE
SOUTH... THE RIDGE WILL GET SQUEEZED BETWEEN THE NORTHERN
DISTURBANCE AND THE LOW APPROACHING THE GULF... EVENTUALLY RETREATING
INTO THE BERING AS WELL AS INTO WESTERN CANADA.  THE SOUTHERN LOW
MOVES EAST MORE SLOWLY... BRINGING RAIN BACK TO SOUTHERN SOUTHEAST
ALASKA ON TUESDAY.

...PRECIPITATION...

SELECTED 24 HOUR PRECIPITATION AMOUNTS ENDING AT 4 AM AKDT TODAY:

LOCATION NAME                 PE TS   24 HR
======== ====                 == ==   =====
ZMBA2    ZAREMBO ISLAND SOUTH PC RG :  1.22
SHLA2    SHELTER COVE RAWS    PC RG :  1.22
PPSA2    POWDER PATCH STATION PC RZ :  1.15
KKEA2    KAKE RAWS            PC RG :  1.00
JDTA2    JUNEAU DOWNTOWN LARC PC RP :  0.81
CRGA2    CRAIG WEATHER STN    PC RG :  0.79
PAKT     KETCHIKAN AIRPORT    PP RZ :  0.76
HADA2    HAIDA RAWS           PC RG :  0.70
SGRA2    SAGAVANIRKTOK RIVER  PC RG :  0.65
PAJN     JUNEAU AIRPORT       PP RZ :  0.64
MNDA2    MENDENHALL LAKE      PC RG :  0.58
PAOH     HOONAH               PP RZ :  0.56
PAGN     ANGOON               PP RZ :  0.56
MCAA2    MONTANA CREEK        PC RG :  0.55
SAWA2    SPEEL ARM STATION    PC RZ :  0.51
ARGA2    ATIGUN RIVER         PC RG :  0.50
SNEA2    SNETTISHAM POWER STN PC RZ :  0.47
HONA2    HOONAH RAWS          PC RG :  0.46
CRUA2    COLVILLE RIVER       PC RG :  0.43
DCSA2    DAVIES CREEK SNOTEL  PC R2 :  0.42
SDIA2    SOUTH DOUGLAS        PC RZ :  0.41
PAKW     KLAWOCK AIRPORT      PP RZ :  0.41
GNLA2    NUNATAK LOWER        PC RG :  0.39
GNUA2    NUNATAK UPPER        PC RG :  0.37
PASA     SAVOONGA             PP RZ :  0.36
UMTA2    UMIAT AIRFIELD       PC RG :  0.35
SOUA2    SOULE RIVER          PC RG :  0.32
PASI     SITKA AIRPORT        PP RZ :  0.24
PAFE     KAKE                 PP RZ :  0.23
GTSA2    GUSTUVUS 2NE         PP RG :  0.20

...LONG RANGE...

THE 6 TO 10 DAY TEMPERATURE OUTLOOK HAS INCREASED PROBABILITIES OF
ABOVE NORMAL TEMPERATURES OVER THE ENTIRE STATE.

THE 6 TO 10 DAY PRECIPITATION OUTLOOK HAS INCREASED PROBABILITIES OF
ABOVE NORMAL PRECIPITATION OVER ROUGHLY THE NORTHERN HALF OF THE
MAINLAND.

PLEASE REFER TO THE CLIMATE PREDICTION CENTER HOME PAGE FOR FURTHER
INFORMATION.

....................................................................

THIS TEXT PRODUCT WILL BE ISSUED DAILY UNTIL FREEZEUP IN THE FALL. A
GRAPHICAL VERSION OF THE HYDROMET DISCUSSION IS AVAILABLE AT
HTTP://WWW.WEATHER.GOV/APRFC/GRAPHICALHMD

$$
ACL


USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.