FPCN39 CWLW 021448
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 2 JANUARY 1998 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   -6     200   5     69   -4    1200   5
KAMLOOPS     KEL       9   -8     350   5     75   -6    1300  15
OKANAGAN     KEL      40   -4     750   8     71   -3    1300   9
CASTLEGAR    SPOK      9    2     500  13     70    0    1300  13
CRANBROOK    SPOK     96    3    1300  44     66   -4    1300  14
REVELSTOKE   KEL      80   -3    1650   9     80   -3    1650   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
PENTICTON    VR   5   VR   5   W   17
CRANBROOK             W    9   W   24

TODAY'S VENTING: GOOD.


VENTING FOR SATURDAY: 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  -20     950   8     63  -15    1850   8
PR. GEORGE   P.G.     11  -23     750   3     37  -18    1250   6
SMITHERS     P.G.     60  -11    1850   5     62  -10    1950   5
WELLS GRAY   P.G.     39  -19    1450   8     59  -16    1800   8
FT NLSN      F.N.      9  -33     400   3     20  -28     800   4
FT STJOHN    F.N.      9  -27     700   3     20  -18    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
PR. GEORGE            VR   5   NW  19
SMITHERS              SE  19   SW  19

TODAY'S VENTING: Generally good west of the Rockies. Poor east of the
Rockies.


VENTING FOR SATURDAY: GOOD


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9    2     100   7     69    4    1200   7
FRASER VLY   QUIL      9    1      50   7     67    4    1200   7
SRN VRISL    QUIL     28    4     400   6     90    6    1450  10
CNTRL VRISL  QUIL     13    1     150   4     55    2     800   4
NRN VRISL    HRDY     11    0     100   2     55    3     750   8
TERRACE      ANT       9   -8     200   4     60   -8    1200  12
STEWART      ANT       9   -5       0   6      9   -8     400  12



*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    E   19   S   13   SW  15
PORT HARDY   SE  20   S   13   VR   5
SANDSPIT     SE  20   VR   5   VR   5

TODAY'S VENTING: Generally good.


VENTING FOR SATURDAY: GOOD.


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


END/GF