FPCN39 CWLW 081400
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 THURSDAY 8 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     100   15    3300  15    100   28    3200  15
KAMLOOPS     KEL      90   14    3300  10    100   27    3350  15
OKANAGAN     KEL      90   15    3300  10    100   27    3350  15
CASTLEGAR    SPOK     20   13     700   7    100   25    3500  12
CRANBROOK    SPOK     25   14     800   9    100   23    3950  13
REVELSTOKE   KEL      80   12    3000   8    100   23    3450  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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   NW  13   NW  20
CRANBROOK             NW  11   NW  28

TODAY'S VENTING: GOOD.




VENTING FOR FRIDAY: 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.     42   12    1300  10    100   22    3950  21
PR. GEORGE   P.G.     40   12    1300  10    100   21    2750  19
SMITHERS     P.G.     38   11    1200   7    100   23    3500  17
WELLS GRAY   P.G.     40   10    1300   8    100   22    4000  21
FT NLSN      F.N.     15   14     500   4     24   25     700   5
FT STJOHN    F.N.     10   13     500   3     20   22     700   8

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

FORECAST UPPER WINDS FOR THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   15   W   19
SMITHERS              W   13   SW  19

TODAY'S VENTING: GOOD EXCEPT POOR NORTHEAST.




VENTING FOR FRIDAY: GOOD


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     15   14     700   3     49   21    1100   5
FRASER VLY   QUIL     15   14     700   3     67   24    1400   6
SRN VRISL    QUIL     15   13     700   3     46   22    1150   4
CNTRL VRISL  QUIL     12   15     700   3     57   23    1250   5
NRN VRISL    HRDY     10   12     600   2     20   15    1100   5
TERRACE      ANT      13   15     800   7    100   23    2450  15
STEWART      ANT      14   14     800   5    100   23    2350  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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   N    9   VR   5
PORT HARDY   VR   5   S   15   SW  15
SANDSPIT     S   30   S   33   S   33

TODAY'S VENTING: BECOMING FAIR TO GOOD THIS AFTERNOON EXCEPT POOR
NORTH VANCOUVER ISLAND.




VENTING FOR FRIDAY: GOOD




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


END/TS
$$$$^^