FPCN39 CWLW 121400
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 12 JULY 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       9   20     200   6    100   32    2500  18
KAMLOOPS     KEL       9   20     350   5    100   34    3350   6
OKANAGAN     KEL       9   16     350   6    100   34    3350   6
CASTLEGAR    KEL       9   16     500   6    100   33    3500   7
CRANBROOK    KEL       9   18    1000   5    100   32    3950   6
REVELSTOKE   KEL       9   15     500   6     90   30    2650   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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    W    9   W   20   W   30
CRANBROOK             W   15   W   28

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.      9   13    1000   5    100   26    3950  22
PR. GEORGE   P.G.      9   13     700   5    100   23    3700  21
SMITHERS     P.G.      9   11     550   5    100   21    2350  16
WELLS GRAY   P.G.      9   12    1050   5    100   26    4000  22
FT NLSN      F.N.      9   16     400   5    100   20    1300  23
FT STJOHN    F.N.      9   15     700   5    100   23    3700  27

*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            W   33   W   41
SMITHERS              W   24   W   41

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      9   15     100   5     90   21    1000  15
FRASER VLY   QUIL      9   15      80   5    100   26    1350  14
SRN VRISL    QUIL      9   15      50   5     89   22    1050  13
CNTRL VRISL  QUIL     25   18      50  12     93   23    1150  13
NRN VRISL    HRDY      9   14      50   5     83   17    1000  12
TERRACE      ANT       9   13     250   5    100   17    2250  13
STEWART      ANT       9   12      50   5    100   17    2000  12

*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    W   20   NW  28   NW  37
PORT HARDY   NW  19   NW  33   NW  46
SANDSPIT     W   19   W   35   W   54

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
$$$$^^