FPCN39 CWLW 171320
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 PDT FRIDAY 17 JULY 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   22     550   0     80   32    1750   7
KAMLOOPS     KEL       9   22     600   0    100   35    3350  10
OKANAGAN     KEL       9   20     550   0    100   34    3350  10
CASTLEGAR    SPOK     22   22     750   5     86   33    2050   8
CRANBROOK    SPOK      9   20     950   6    100   31    3950  14
REVELSTOKE   KEL       9   20     550   0     60   28    1000   7

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

FORECAST UPPER WINDS FOR FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   W   19   W   33
CRANBROOK             W   15   W   37

VENTING FOR SATURDAY: 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.     11   16     950  32    100   25    3950  32
PR. GEORGE   P.G.     20   19     800  10    100   22    1850  24
SMITHERS     P.G.      9   16     500   4     76   22    1200  15
WELLS GRAY   P.G.     11   18    1000  32    100   26    4000  32
FT NLSN      F.N.     54   18     700  18    100   23    1650  15
FT STJOHN    F.N.     47   18    1000  16    100   22    2300  14

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

FORECAST UPPER WINDS FOR FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE
SMITHERS              W   20   W

VENTING FOR SATURDAY: GOOD

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     93   19     800  20     70   24    1400  10
FRASER VLY   QUIL     98   20     900  20     80   26    1650  10
SRN VRISL    QUIL      9   19     750   0     60   24    1400   5
CNTRL VRISL  QUIL      9   18     650   0     70   25    1500   5
NRN VRISL    HRDY     37   15     600   6     45   19    1050   5
TERRACE      ANT       9   14     250   3     85   20    2500   5
STEWART      ANT      11   15     250   1     85   20    2500   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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W    9   W   15   W   31
PORT HARDY   VR   5   S    9   W   17
SANDSPIT     SW  15   S   17   S   22

VENTING FOR SATURDAY: GOOD


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


END/KJ