FPCN39 CWLW 211555

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 SATURDAY 21 NOVEMBER 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    2     500   2     75    6    2200  25
KAMLOOPS     KEL       9    1     350   2     82    6    2200  15
OKANAGAN     KEL       9    2     350   2     82    6    2100  15
CASTLEGAR    SPOK      9    1     500   4     75    6    1850  15
CRANBROOK    SPOK      9   -2     950   3     75    3    1850  12
REVELSTOKE   KEL       9    0     450   2     60    3    2050  15

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

FORECAST UPPER WINDS FOR THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    S   11   S   24   SW  41
CRANBROOK             W   15   W   43

TODAY'S VENTING: GOOD

VENTING FOR SUNDAY: 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.     10   -3     950  28     84    0    1400  28
PR. GEORGE   P.G.     11   -6     750   2     82   -1    1450  20
SMITHERS     P.G.     26   -3     850   6    100    1    2550  17
WELLS GRAY   P.G.      9   -3    1000  28     85    0    1450  28
FT NLSN      F.N.      9  -19     400  17     48  -13    1200  17
FT STJOHN    F.N.      9  -13     700  17     39   -6    1000  17

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

FORECAST UPPER WINDS FOR THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   54   SW  48
SMITHERS              SW  39   SW  48

TODAY'S VENTING: FAIR TO GOOD

VENTING FOR SUNDAY: FAIR TO GOOD

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9    7     100  18     84   10    1500  28
FRASER VLY   QUIL      9    7      50  18    100   11    1750  32
SRN VRISL    QUIL      9    8       0   8     95   11    1650  26
CNTRL VRISL  QUIL      9    8      50   8     63   10    1350  21
NRN VRISL    HRDY      9    8     200   8     75   10    1300  22
TERRACE      ANT       9    0     200  33    100    4    2000  33
STEWART      ANT       9    3       0  25    100    5    2000  25

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

FORECAST UPPER WINDS FOR THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   46   S   56   S   46
PORT HARDY   S   48   S   63   S   67
SANDSPIT     S   61   S   65   S   61

TODAY'S VENTING: GOOD

VENTING FOR FRIDAY: FAIR TO GOOD

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

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