FPCN39 CWLW 211359
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 WEDNESDAY 21 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    1     200   4      9    3     200   4
KAMLOOPS     KEL       9    1     350   4     54    3    1000   9
OKANAGAN     KEL      28    2     600   8     54    3    1000   9
CASTLEGAR    SPOK     17    2     750   3     20    3     800   4
CRANBROOK    SPOK      9   -4     950   8      9   -2     950   8
REVELSTOKE   KEL       9    0     450   4      9    0     450   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    S    9   S   19   SW  33
CRANBROOK             W    9   W   26

TODAY'S VENTING: poor to fair.

VENTING FOR THURSDAY: 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.      9   -4     950  19      9   -3     950  19
PR. GEORGE   P.G.     29   -6     900  11     39   -5     950  15
SMITHERS     P.G.     35   -4     900   8     54    0    1100  10
WELLS GRAY   P.G.      9   -4    1050   5     54   -2    1300  19
FT NLSN      F.N.      9  -21     400  13      9  -22     400  13
FT STJOHN    F.N.     49  -19    1100  11     52  -17    1150  11

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

FORECAST UPPER WINDS FOR WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   33   SW  35
SMITHERS              SE  33   S   35

TODAY'S VENTING: poor to fair.

VENTING FOR THURSDAY: fair.


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     20    7     200   9     67    8     450  21
FRASER VLY   QUIL      9    5      50   9     63    8     400  21
SRN VRISL    QUIL     20    7     150   7     70    9     550  15
CNTRL VRISL  QUIL     19    7     200   7     19    7     200   7
NRN VRISL    HRDY     20    7     150  10     44    8     350  13
TERRACE      ANT       9    0     200  28     10    1     250  28
STEWART      ANT       9    4       0  10      9    1       0  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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SE  50   S   59   S   59
PORT HARDY   S   54   S   54   SW  41
SANDSPIT     S   30   S   28   S   30

TODAY'S VENTING: good south to poor north.

VENTING FOR THURSDAY: good south.  Poor north.


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


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