FPCN39 CWLW 111330 CCA
CORRECTED SMOKE CONTROL FORECAST FOR COASTAL BC AND THE INTERIOR
INCLUDING THE NORTHEAST ISSUED BY THE MOUNTAIN WEATHER SERVICE OFFICE
OF ENVIRONMENT CANADA AT 6.29 AM PDT WEDNESDAY 11 AUGUST 1999 FOR
TODAY.

FPCN39 CWLW 111400
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 WEDNESDAY 11 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      24   24     850  10     84   29    1550  10
KAMLOOPS     KEL      15   21     650   2     75   28    1850   4
OKANAGAN     KEL      13   19     500   2     88   27    1500   4
CASTLEGAR    SPOK      9   19     500  12     71   26    1250  12
CRANBROOK    SPOK     10   19     950  26    100   26    2400  21
REVELSTOKE   KEL      10   18     500   2     57   24    1250   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   W   11   W   13
CRANBROOK             VR   5   W   11

TODAY'S VENTING: becoming good by the afternoon.


VENTING FOR THURSDAY: FAIR




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.     49   17    1650   7    100   24    3950   8
PR. GEORGE   P.G.     38   15    1200   7     70   19    1450   7
SMITHERS     P.G.      9   13     500   2     45   16    1150   5
WELLS GRAY   P.G.     11   10    4000   4    100   23    4000   8
FT NLSN      F.N.      9   13     400   2    100   20    2850  10
FT STJOHN    F.N.      9   10     700  10     71   13    1500  11

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

FORECAST UPPER WINDS FOR WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            E   15   SE  13
SMITHERS              NE  28   E   13

TODAY'S VENTING: BECOMING GOOD BY THE AFTERNOON EXCEPT FAIR
IN THE NORTHWEST.


VENTING FOR THURSDAY: FAIR




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     49   19     800   7     61   22    1150   6
FRASER VLY   QUIL     49   19     800   7     72   25    1600   6
SRN VRISL    QUIL     44   17     700   6     54   22    1000   6
CNTRL VRISL  QUIL     48   20     800   6     74   26    1750   6
NRN VRISL    HRDY     40   15     700   3     60   20    1300   6
TERRACE      ANT      70   17    1350   8    100   21    3200   7
STEWART      ANT      45   16     750   6    100   21    3000   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  17   SW  19   SW  20
PORT HARDY   W   13   SW  17   SW  26
SANDSPIT     N   24   N   28   N   30

TODAY'S VENTING:FAIR TO GOOD.


VENTING FOR THURSDAY: FAIR

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



END/LM