FPCN39 CWLW 241422
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 SUNDAY 24 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   -8     500   0     19   -6     850   2
KAMLOOPS     KEL       9  -10     500   0     35   -7    1000   4
OKANAGAN     KEL      13   -9     600   2     45   -6    1300   4
CASTLEGAR    SPOK     42   -2    1100   6     52   -1    1400   6
CRANBROOK    SPOK      9  -11     950  10      9   -8     950  10
REVELSTOKE   KEL      50   -5    1350   5     50   -4    1350   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   W   17   NW  35
CRANBROOK             W   13   W   43

TODAY'S VENTING: POOR TO FAIR.

VENTING FOR MONDAY: 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.     45  -15    1100  21     50  -11    1400  10
PR. GEORGE   P.G.     45  -15    1100  13     50  -12    1250  10
SMITHERS     P.G.     45  -12    1150   7     50  -10    1050   9
WELLS GRAY   P.G.     45  -14    1350  10     50  -11    1450  10
FT NLSN      F.N.      9  -21     400   0      9  -16     400   0
FT STJOHN    F.N.     30  -11     950  15     40  -12    1000  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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  46   W   48
SMITHERS              SW  61   W   48

TODAY'S VENTING: FAIR.

VENTING FOR MONDAY: POOR TO FAIR




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9    2     100   3     22    6     550   3
FRASER VLY   QUIL     10    0     100   3     13    3     200   3
SRN VRISL    QUIL     13    2     150   3     22    6     450   3
CNTRL VRISL  QUIL     13    2     150   3     17    5     300   3
NRN VRISL    HRDY     10    2      50   2     25    5     550   4
TERRACE      ANT       9  -10     200   5      9   -7     200   5
STEWART      ANT       9  -10      50   5      9   -7      50   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   W   24   W   39
PORT HARDY   S   44   SW  52   W   61
SANDSPIT     W   44   W   50   W   59

TODAY'S VENTING: POOR.

VENTING FOR MONDAY: POOR TO FAIR




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


END/MWSO