FPCN39 CWLW 101336
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 TUESDAY 10 AUGUST 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      24   24     700   3     85   30    2150   6
KAMLOOPS     KEL      22   23     800   3     86   29    2400   6
OKANAGAN     KEL      17   20     600   3     73   28    2050   5
CASTLEGAR    SPOK     23   21     850   4     51   29    1600   5
CRANBROOK    SPOK      9   19     950   5     72   26    2500   6
REVELSTOKE   KEL       9   18     600   0     26   23    1000   3

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

FORECAST UPPER WINDS FOR TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   VR   5   VR   5
CRANBROOK             VR   5   SW  13

TODAY'S VENTING: BECOMING GOOD BY LATE MORNING.


VENTING FOR WEDNESDAY: 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.     40   15    3950   5    100   25    3950   8
PR. GEORGE   P.G.     13   15     900   2    100   21    3700   9
SMITHERS     P.G.      9   13     500   1     81   20    2050   7
WELLS GRAY   P.G.     40   10    1000   5    100   25    4000  10
FT NLSN      F.N.     39   13    1150   4     89   18    2450   7
FT STJOHN    F.N.     92   15    2450   8    100   19    3700   9

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

FORECAST UPPER WINDS FOR TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W    9   W   13
SMITHERS              W    9   W   13

TODAY'S VENTING: BECOMING GOOD BY LATE MORNING.


VENTING FOR WEDNESDAY: GOOD


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     42   19     700   6     46   23     950   5
FRASER VLY   QUIL     44   20     800   6     58   26    1450   5
SRN VRISL    QUIL     26   17     500   4     46   23     950   5
CNTRL VRISL  QUIL     41   20     750   5     59   27    1600   4
NRN VRISL    HRDY     48   15     550   9     71   17     900  10
TERRACE      ANT      59   16    1200   7     82   20    1950   7
STEWART      ANT      43   16     650   6     76   20    1650   6


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

FORECAST UPPER WINDS FOR TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W    9   W    9   W    9
PORT HARDY   NW  30   N   24   N   15
SANDSPIT     W   22   W   30   W   33

TODAY'S VENTING: FAIR IN THE SOUTH. GOOD IN THE CENTRAL AND NORTHERN
DISTRICTS.

VENTING FOR WEDNESDAY: GOOD


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

END/lm