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2
FPCN39 CWLW 311530
SMOKE CONTROL FORECAST FOR COASTAL BC AND THE INTERIOR INCLUDING THE
NORTHEAST ISSUED BY THE MOUNTAIN WEATHER SERVICE OFFICE OF
ENVIRONMENT CANADA AT 8:00 AM PST FRIDAY 31 JANUARY 1997 FOR TODAY.

VENTILATION INDICES (TEMPERATURE) AND MIXING HEIGHTS.
MIXING HEIGHTS IN METRES ABOVE SEA LEVEL.
AVERAGE WINDS IN KNOTS.

SPOT INDICES ARE DETERMINED BY THE ASPECT AND ELEVATION OF THE SITES.
COMPARE WINDS, TEMPERATURES AND ELEVATION WITH THE SITES HERE
TO DETERMINE THE INDEX IN ANY OTHER AREA.

SOUTHERN INTERIOR

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
FRSR CANYN   KEL      20    4     600   4     40    7    1100   4
KAMLOOPS     KEL      21    3     650   4     35    7    1100   4
OKANAGAN     KEL      21    0     650   4     35    4    1100   4
CASTLEGAR    SPOK     15    2     750   4     38    3    1400   4
CRANBROOK    SPOK      9    4     950   4     22    4    1400   4
REVELSTOKE   KEL      21    0     650   4     29    1    1100   4


*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   VR   5   W   22
CRANBROOK             W    9   W   30

TODAY'S VENTING: FAIR.
VENTING FOR SATURDAY: FAIR TO GOOD.


CENTRAL INTERIOR/NORTHEAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
WILLIAMS L   P.G.      9    0     950   4     88    4    2600  10
PR. GEORGE   P.G.     18    3     950   8    100    5    2600  13
SMITHERS     P.G.      9    1     950   5     85    3    2600   8
WELLS GRAY   P.G.     11    2    1000  14    100    5    2600  14
FT NLSN      F.N.      9   -9     650   7     29   -8     950   5
FT STJOHN    F.N.     36    3     650  15     22    4     950   8


*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  20   W   26
SMITHERS              S   31   SW  26

TODAY'S VENTING: GOOD EXCEPT POOR IN THE NORTHEAST.
VENTING FOR SATURDAY: FAIR.


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     11    7     275   3     80   10    1800   7
FRASER VLY   QUIL     11    8     275   3     80   10    1800   7
SRN VRISL    QUIL     11    7     275   3     86   10    1800   9
CNTRL VRISL  QUIL     11    6     250   3     85    8    1800   9
NRN VRISL    HRDY     10    7     250   3     70    9    1100  10
TERRACE      ANT       9    4     220   5    100    5    2600  10
STEWART      ANT       9    5     100   5    100    5    2600   8


*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SE  11   SW  15   SW  24
PORT HARDY   S   39   SW  43   SW  35
SANDSPIT     SW  37   SW  41   SW  43

TODAY'S VENTING: GOOD.
VENTING FOR SATURDAY: FAIR TO GOOD.


VENTILATION GUIDELINES:
          0-33.....POOR
          34-54.....FAIR
          55-100.....GOOD.
VENTILATION INDICES NORMALLY DROP TO POOR AFTER SUNSET.

END/MWSO/TAL


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