FPCN39 CWLW 271323
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 27 AUGUST 1998 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      16   18     500   2     88   26    1700   9
KAMLOOPS     KEL      13   17     500   2     98   26    2050  10
OKANAGAN     KEL      13   17     500   2    100   28    2200  10
CASTLEGAR    SPOK     32   17     900   6     95   27    2400   8
CRANBROOK    SPOK      9   15     950  11    100   26    3950  10
REVELSTOKE   KEL      10   15     500   2     76   23    1600   9

*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   W   17   W   31
CRANBROOK             W   15   W   37

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.    100   14    3950  26    100   22    3950  15
PR. GEORGE   P.G.     24   13     900   7    100   19    3700  15
SMITHERS     P.G.      9   12     550   1     90   17    1700  15
WELLS GRAY   P.G.    100   14    4000  26    100   21    4000  15
FT NLSN      F.N.     30   13     550  12    100   18    2400  15
FT STJOHN    F.N.     10   11     700  16    100   19    3700  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
PR. GEORGE             W 35     W 44
SMITHERS               W 27     W 36

TODAY'S VENTING: GOOD.

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     74   17    1000  11     50   21    1200   8
FRASER VLY   QUIL     74   17     950  11     83   24    1300  10
SRN VRISL    QUIL      9   14     350   0     70   22    1100   8
CNTRL VRISL  QUIL     63   17     950   8     74   24    1250   8
NRN VRISL    HRDY      9   14       0  11     63   17     750  10
TERRACE      ANT      10   12     250  20    100   17    2500  20
STEWART      ANT      54   14     550  11    100   17    1800  17

*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   W    9   W   26
PORT HARDY   SW  17   SW  30   SW  43
SANDSPIT     S   31   SW  35   SW  43

TODAY'S VENTING: GOOD EXCEPT FAIR ALONG SOUTH COASTAL SECTIONS.

VENTING FOR FRIDAY: GOOD

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

END/KJ