FPCN39 CWLW 021400
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 MONDAY 2 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      14   23     700   1     74   32    1800   6
KAMLOOPS     KEL      13   22     800   1     68   30    1750   6
OKANAGAN     KEL      12   21     650   1     80   31    2000   7
CASTLEGAR    SPOK     17   22     750   3    100   31    3500   7
CRANBROOK    SPOK      9   21     950   5    100   31    3950   8
REVELSTOKE   KEL       9   19     550   0     54   26    1550   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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   E    9   VR   5
CRANBROOK             VR   5   VR   5

TODAY'S VENTING: GOOD


VENTING FOR TUESDAY: 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.     21   17    1250   4    100   25    3950   6
PR. GEORGE   P.G.     26   15     950   7    100   25    3700   6
SMITHERS     P.G.     24   16     950   4     93   27    3500   5
WELLS GRAY   P.G.     30   13    1200   6    100   25    4000   6
FT NLSN      F.N.      9   18     400   4     47   25    1500   4
FT STJOHN    F.N.      9   15     700   6     51   23    1850   4

*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            VR   5   SW   9
SMITHERS              E   17   S    9

TODAY'S VENTING: GOOD

VENTING FOR TUESDAY: GOOD


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     28   18     750   3     63   23    1100   7
FRASER VLY   QUIL     28   18     750   3     78   26    1300   8
SRN VRISL    QUIL     23   17     650   2     55   23     950   6
CNTRL VRISL  QUIL     24   18     750   2     55   23     950   6
NRN VRISL    HRDY     56   17     850   7     64   21     950   8
TERRACE      ANT      14   21     300   6    100   28    3200  12
STEWART      ANT      11   19     200   1     62   28    1400   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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   SE  19   SE  22
PORT HARDY   VR   5   SE  43   S   50
SANDSPIT     SE  20   SE  33   SE  37

TODAY'S VENTING: GOOD


VENTING FOR TUESDAY: GOOD




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


END/MWSO
$$$$^^