FPCN39 CWLW 031400
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 3 SEPTEMBER 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      34   16     850   4     93   25    3200   5
KAMLOOPS     KEL      30   15     900   4     93   24    3350   5
OKANAGAN     KEL      19   13     600   4     93   23    3350   5
CASTLEGAR    SPOK     20   14     800   4    100   23    3500  11
CRANBROOK    SPOK      9   12     950  12    100   19    3950  13
REVELSTOKE   KEL      19   13     750   4     93   21    3450   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
PENTICTON    VR   5   VR   5   NW   9
CRANBROOK             VR   5   VR   5

TODAY'S VENTING: GOOD

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.      9    9     950  14    100   17    2900  11
PR. GEORGE   P.G.     28   10     850  12    100   17    2200  12
SMITHERS     P.G.     12    9     800   1     41   16    1000   7
WELLS GRAY   P.G.     22    9     800   8    100   17    4000  11
FT NLSN      F.N.     18   13     550   6    100   19    2100  11
FT STJOHN    F.N.      9   11     700  10    100   19    3700  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            SW  15   W   20
SMITHERS              SW  35   SW  20

TODAY'S VENTING: GOOD EXCEPT IN FAIR IN SMITHERS.


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     16   16     250   4     64   22    1200   7
FRASER VLY   QUIL     17   17     250   4    100   26    3050   7
SRN VRISL    QUIL     16   16     250   3     44   22     750   6
CNTRL VRISL  QUIL     15   16     250   3     44   22     750   6
NRN VRISL    HRDY     60   15     750   9     70   19    1000   9
TERRACE      ANT      43   11     800   7     67   18    1150   8
STEWART      ANT      46   10     750   5     51   15    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
VANCOUVER    W    9   VR   5   N   11
PORT HARDY   NW   9   W    9   W   17
SANDSPIT     SW  26   SW  31   W   39

TODAY'S VENTING: GOOD EXCEPT FAIR CENTRAL AND NORTHERN VANCOUVER
ISLAND AND STEWART AREA.


VENTING FOR SATURDAY: GOOD


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


END/MWSO
$$$$^^