FPCN39 CWLW 151347
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 MONDAY 15 MARCH 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    4     500   8     50    9    3300   8
KAMLOOPS     KEL       9    4     550   7     50   10    3350   7
OKANAGAN     KEL       9    3     500   7     50    9    3350   7
CASTLEGAR    SPOK     31    4     800   8     50    8    3300   8
CRANBROOK    SPOK      9    4     950  10     50    8    3350  15
REVELSTOKE   KEL       9    2     500   0     50    5    3350   0

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

FORECAST UPPER WINDS FOR MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SW  20   W   43
CRANBROOK             SW  15   SW  35

TODAY'S VENTING: FAIR.

VENTING FOR TUESDAY: 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.     50   -1    2400  13     60    4    3950  10
PR. GEORGE   P.G.     60   -1    1200  13     60    4    3700  10
SMITHERS     P.G.     47    0    1000   9     60    4    2800  10
WELLS GRAY   P.G.     60   -1    2400  13     60    4    4000  10
FT NLSN      F.N.     19   -1     550   7     60    6    2600  10
FT STJOHN    F.N.     10    0     700  13     60    4    2700  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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  20   W   35
SMITHERS              W   26   W   35

TODAY'S VENTING: GOOD.

VENTING FOR TUESDAY: FAIR




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     74    6    1400   7     87    9    1550   9
FRASER VLY   QUIL     32    5     500   6     87    9    1550   9
SRN VRISL    QUIL     17    5     250   4     86   10    1550   8
CNTRL VRISL  QUIL     22    5     300   5     80    8    1450   8
NRN VRISL    HRDY     50    4     800   6     88    6    1500   9
TERRACE      ANT      10    1     200  31    100    3     900  15
STEWART      ANT      10    1     200  31     81    3     450  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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   13   W   22   W   41
PORT HARDY   NW  33   W   30   SW  30
SANDSPIT     W   31   W   37   W   39

TODAY'S VENTING: GOOD.

VENTING FOR TUESDAY: FAIR




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


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