FPCN39 CWLW 081341
SMOKE CONTROL FORECAST FOR COASTAL BC AND THE INTERIOR INCLUDING THE
NORTHEAST ISSUED BY THE MOUNTAIN WEATHER SERVICE OFFICE OF
ENVIRONMENT CANADA AT 7:00 AM PST FRIDAY 8 JANUARY 1999 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       9    1     200   0     39    3     450   5
KAMLOOPS     KEL       9    1     350   0     39    2     600   5
OKANAGAN     KEL       9    1     350   0     39    3     700   5
CASTLEGAR    SPOK      9   -1     500   4     39   -1     500   4
CRANBROOK    SPOK      9   -8     950  15     49   -5     950  15
REVELSTOKE   KEL       9    1     550   0     40    2     700   5

*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    W   13   W   30   NW  43
CRANBROOK             W   19   NW  65

TODAY'S VENTING: FAIR.

VENTING FOR SATURDAY: POOR TO FAIR.




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.     37   -2    1250  14     34   -1    1350   8
PR. GEORGE   P.G.     32   -8    1000   8     39   -4    1100   6
SMITHERS     P.G.     31   -4    1100   4     38   -2    1150   4
WELLS GRAY   P.G.     31   -4    1100   4     53   -1    1400  10
FT NLSN      F.N.      9  -29     400   0      9  -27     400   0
FT STJOHN    F.N.      9  -23     750   0     14  -20     950   2

*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            W   57   W   67
SMITHERS              W   56   W   67

TODAY'S VENTING: FAIR

VENTING FOR SATURDAY: POOR




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     41    7     400  11     44    8     750   7
FRASER VLY   QUIL     37    7     350  11     41    8     650   7
SRN VRISL    QUIL      9    6      50   0     43    9     850   9
CNTRL VRISL  QUIL      9    6     100   0     43    8     550   7
NRN VRISL    HRDY     11    7     250   1     15    8     600   1
TERRACE      ANT      11    2     250  36     11    3     250  11
STEWART      ANT      11    2     250  36      9    3       0   9

*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    SW  39   W   43   W   43
PORT HARDY   SW  50   SW  50   W   44
SANDSPIT     W   22   W   26   W   41

TODAY'S VENTING: FAIR.




VENTING FOR SATURDAY: POOR TO FAIR.




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


END/JMS