FPCN39 CWLW 291327
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 SATURDAY 29 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       9   20     500   0     28   31    1150   2
KAMLOOPS     KEL       9   19     500   0     29   31    1300   2
OKANAGAN     KEL       9   19     500   0     31   32    1450   2
CASTLEGAR    SPOK      9   19     500   3     26   31    1050   3
CRANBROOK    SPOK      9   17     950   9    100   31    3950   7
REVELSTOKE   KEL       9   18     500   0     22   28    1150   2

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

FORECAST UPPER WINDS FOR SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   VR   5   W   17
CRANBROOK             W    9   W   19

TODAY'S VENTING: POOR EXCEPT GOOD ABOVE 1000 METRES.

VENTING FOR SUNDAY: POOR

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.     10   16     950  10     60   27    3950   5
PR. GEORGE   P.G.      9   15     700   0     60   25    3700   5
SMITHERS     P.G.      9   14     700   0     45   22    1300   4
WELLS GRAY   P.G.     10   16    1000  10    100   26    4000   5
FT NLSN      F.N.      9   13     400   5     70   22    1550   5
FT STJOHN    F.N.      9   15     700   5    100   23    2400  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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW 20    SW 35
SMITHERS              SW 40    SW 45

TODAY'S VENTING: FAIR TO GOOD.

VENTING FOR SUNDAY: FAIR.

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     60   19     600  13     30   24     850   8
FRASER VLY   QUIL     66   20     600  14     40   29    1000   6
SRN VRISL    QUIL     54   17     500  11     35   24     800   6
CNTRL VRISL  QUIL     57   19     600  11     40   28     900   6
NRN VRISL    HRDY     32   16     500   5     40   19     750   5
TERRACE      ANT       9   13     250   8     45   16    1000   6
STEWART      ANT      22   14     300   5     44   16    1000   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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W   15   NW  20   W   19
PORT HARDY   SW  13   SW  31   SW  46
SANDSPIT     NW  19   W   24   SW  44

TODAY'S VENTING: FAIR TO POOR.

VENTING FOR SUNDAY: POOR

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


END/KJ