FPCN39 CWLW 291419
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 29 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    5     200  10     15    6     200  10
KAMLOOPS     KEL      24    8     500  10     24    8     500  10
OKANAGAN     KEL      22    7     500  10     22    7     500  10
CASTLEGAR    SPOK      9    6     500  18     10    6     500  18
CRANBROOK    SPOK     12    2     950  53     12    4     950  53
REVELSTOKE   KEL       9    2     450  10     10    2     450  10

*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    S   17   SW  44   SW 106
CRANBROOK             SW  31   SW  93

TODAY'S VENTING: POOR.

VENTING FOR SATURDAY: POOR

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.    100    1    2000  23    100    2    2100  23
PR. GEORGE   P.G.     64   -2    1150  16     80   -1    1300  17
SMITHERS     P.G.      9   -6     500   1     10   -4     500   3
FT NLSN      F.N.     37  -19     900   6     39  -18    1000   6
FT STJOHN    F.N.     43  -17    1300   6     48  -16    1350   7

*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  37   SW  56
SMITHERS              SW  46   SW  56

TODAY'S VENTING: POOR IN VALLEYS. GOOD ABOVE 800 METRES.

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     90    9    1000  25     90    9    1000  25
FRASER VLY   QUIL    100    9     900  30    100    9     900  30
SRN VRISL    QUIL     90   10    1000  25     90   10    1000  25
CNTRL VRISL  QUIL     70    8     900  15     70    8     900  15
NRN VRISL    HRDY     11    5      50   5     85    6     800  20
TERRACE      ANT      10   -2     200  19     58   -1     550  19
STEWART      ANT      10   -2     200  10     45   -1     500  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    S   54   S   83   SW  94
PORT HARDY   S   31   SW  46   SW  56
SANDSPIT     SW  31   SW  39   SW  44

TODAY'S VENTING: GOOD SOUTH. FAIR NORTH.

VENTING FOR SATURDAY: POOR

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


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