FPCN39 CWLW 241400
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 24 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      52   25     600  20    100   30    1000  25
KAMLOOPS     KEL       9   22     550   0     87   31    2100   8
OKANAGAN     KEL       9   20     500   0     74   30    1700   7
CASTLEGAR    SPOK     25   23     800   6     79   32    1600  10
CRANBROOK    SPOK      9   21     950  12     78   30    3950   8
REVELSTOKE   KEL       9   19     500   0     22   26     850   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   SW  19   SW  31
CRANBROOK             W   11   SW  31

TODAY'S VENTING: GOOD

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.     14   14    1200  03     55   20    2400  08
PR. GEORGE   P.G.     17   14     800  03     55   19    2300  07
SMITHERS     P.G.     16   14     900  03     58   17    2200  07
WELLS GRAY   P.G.     22   13    1200  06     64   17    2800  08
FT NLSN      F.N.      9   13     550   0    100   20    2700  13
FT STJOHN    F.N.     15   12    1000  04     89   19    2900  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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  35   SW  56
SMITHERS              SW  31   SW  56

TODAY'S VENTING: GOOD

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     67   20     700  13     72   25    1200   9
FRASER VLY   QUIL     62   19     600  13     69   25    1150   8
SRN VRISL    QUIL     28   17     400   0     78   22    1000   8
CNTRL VRISL  QUIL     18   21     700   0     80   26    1250   9
NRN VRISL    HRDY      9   15     150   1     47   17     450   9
TERRACE      ANT      78   13     850  17     93   14    1100  17
STEWART      ANT      10   12      50   2     48   14     550   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    SW  15   SW  26   SW  43
PORT HARDY   S   30   SW  39   SW  48
SANDSPIT     S   39   S   28   SW  24

TODAY'S VENTING: FAIR TO GOOD

VENTING FOR WEDNESDAY: GOOD


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


END/MWSO
$$$$^^