FPCN39 CWLW 261318
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 SUNDAY 26 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   26     500   0     79   37    1800   7
KAMLOOPS     KEL       9   25     500   0    100   39    3350   7
OKANAGAN     KEL       9   26     550   0    100   39    3350   7
CASTLEGAR    SPOK     17   26     750   3     75   38    3500   3
CRANBROOK    SPOK      9   22     950   2     76   35    3950   3
REVELSTOKE   KEL       9   24     500   0    100   36    3450   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   VR   5   VR   5
CRANBROOK             VR   5   W   11

TODAY'S VENTING: GOOD




VENTING FOR MONDAY: 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.      9   18     950  11    100   30    2650  12
PR. GEORGE   P.G.      9   18     800   0     88   29    2200   9
SMITHERS     P.G.      9   18     750   0     81   27    1900   8
WELLS GRAY   P.G.      9   20    1000  11    100   32    4000  12
FT NLSN      F.N.      9   18     400   1    100   27    2750  17
FT STJOHN    F.N.      9   18     700   0    100   27    3700  19

*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   NW  11   N   17   N   17
SMITHERS              NW  13   NW  24

TODAY'S VENTING: GOOD




VENTING FOR MONDAY: GOOD




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     19   22     300   5     39   28     750   5
FRASER VLY   QUIL     29   25     500   5     67   35    1650   5
SRN VRISL    QUIL      9   20     200   0     23   27     600   3
CNTRL VRISL  QUIL      9   24     400   0     72   37    1950   5
NRN VRISL    HRDY     35   17     400   8     44   23     550   8
TERRACE      ANT      68   21     550  23    100   32    2350  25
STEWART      ANT      72   22     500  19    100   32    1850  23

*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   VR   5   VR   5
PORT HARDY   VR   5   VR   5   VR   5
SANDSPIT     N   44   N   31   N   22

TODAY'S VENTING: GOOD




VENTING FOR MONDAY: GOOD




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


END/RAM