FPCN39 CWLW 161430
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 16 MARCH 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      48    8     750  10    100   10    2550  15
KAMLOOPS     KEL       9    6     350   2     68    9    1400  10
OKANAGAN     KEL       9    6     350   2     38    8    1050   8
CASTLEGAR    SPOK      9    5     500  14      9    6     500  14
CRANBROOK    SPOK      9    4     950  19      9    4     950  19
REVELSTOKE   KEL       9    4     450   2      9    5     450   2

*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    W   11   W   19   NW  28
CRANBROOK             VR   5   W   17

TODAY'S VENTING: POOR EAST. FAIR TO GOOD WEST.


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.     10    2     950  13     10    4     950  13
PR. GEORGE   P.G.      9    2     700   5     41    5    1150   8
SMITHERS     P.G.     11    2     650   2     32    6    1050   5
WELLS GRAY   P.G.     10    2    1000  13     48    4    1500  11
FT NLSN      F.N.      9    1     400  10      9    5     400  10
FT STJOHN    F.N.      9    1     700  10     21    4     800  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            N   20   N   20
SMITHERS              N   13   N   20

TODAY'S VENTING: POOR

VENTING FOR TUESDAY: POOR




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL    100    9    1100  19    100   12    2500  20
FRASER VLY   QUIL    100   10    1500  19    100   14    3050  21
SRN VRISL    QUIL     83    9     800  16    100   13    2650  19
CNTRL VRISL  QUIL     13    7     100   5    100   11    1650  17
NRN VRISL    HRDY     44    6     450   9     90    9    1450  10
TERRACE      ANT       9    5     250   2     45    8    1700   3
STEWART      ANT      13    6     350   1     30    8    1150   2

*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    NW  26   NW  28   N   31
PORT HARDY   NW  28   N   28   N   30
SANDSPIT     NW  13   NW  15   NW  17

TODAY'S VENTING: GOOD SOUTH. FAIR NORTH.


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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