FPCN39 CWLW 021323
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 2 SEPTEMBER 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      18   19     450   3    100   33    2500  14
KAMLOOPS     KEL      12   17     450   3     81   29    1780   7
OKANAGAN     KEL      13   19     500   3    100   31    2400  12
CASTLEGAR    SPOK     32   21     750  10     56   32    1000  11
CRANBROOK    SPOK      9   18     950  14    100   32    2650  20
REVELSTOKE   KEL      10   17     450   3     47   27    2650   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    W    9   W   22   W   37
CRANBROOK             W   15   W   37

TODAY'S VENTING: GOOD

VENTING FOR THURSDAY: GOOD


CENTRAL INTERIOR/NORTHEAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
WILLIAMS L   F.N.     10   14     950  16    100   22    3950  24
PR. GEORGE   F.N.      9   16     700  15    100   22    3700  23
SMITHERS     P.G.      9   10     500   5     59   18     900   5
WELLS GRAY   F.N.     97   16    2050  16    100   23    4000  24
FT NLSN      F.N.     25   14     550   9     69   19    1900   9
FT STJOHN    F.N.      9   15     700  15    100   22    3700  23

*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
SMITHERS              SW  35   SW

TODAY'S VENTING: GOOD

VENTING FOR THURSDAY: GOOD


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     59   18     600  13     83   24    1000  13
FRASER VLY   QUIL     72   20     750  13    100   28    1400  13
SRN VRISL    QUIL      9   18     450   0     79   25    1000   0
CNTRL VRISL  QUIL      9   20     750   0     70   28    1350   7
NRN VRISL    HRDY     20   16     150   9     70   19     700  12
TERRACE      ANT     100   13    1150  51    100   19    2850  52
STEWART      ANT     100   16    1550  48    100   19    2700  48

*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    W    9   W   22   W   41
PORT HARDY   VR   5   SW  20   W   44
SANDSPIT     SW  33   SW  41   SW  48

TODAY'S VENTING: GOOD

VENTING FOR THURSDAY: GOOD


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


END/MWSO