FPCN39 CWLW 101336
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 MONDAY 10 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      12   20     500   1     87   31    2250   6
KAMLOOPS     KEL      10   19     500   1    100   32    2800   8
OKANAGAN     KEL      10   19     500   1    100   32    2800   8
CASTLEGAR    SPOK     19   21     750   4     49   31    1350   6
CRANBROOK    SPOK      9   18     950   8    100   29    3950  10
REVELSTOKE   KEL       9   18     500   1     79   28    2150   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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SW  11   SW  24
CRANBROOK             W    9   W   17

TODAY'S VENTING: GOOD

VENTING FOR TUESDAY: 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   16    2550  18    100   22    3950  20
PR. GEORGE   P.G.     99   16    2050  12    100   21    3700  16
SMITHERS     P.G.      9   12     500   4    100   21    3500  16
WELLS GRAY   P.G.    100   17    4000  20    100   23    4000  20
FT NLSN      F.N.      9   15     400  23    100   22    3400  26
FT STJOHN    F.N.     23   13     750  23    100   22    3700  26

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

FORECAST UPPER WINDS FOR MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE
SMITHERS              SW  22   SW

TODAY'S VENTING: GOOD


VENTING FOR TUESDAY: GOOD


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     55   19     650  10     94   24    1500  11
FRASER VLY   QUIL     40   18     450   9    100   25    1650  11
SRN VRISL    QUIL      9   16       0   4     68   21     900   9
CNTRL VRISL  QUIL     35   18     450   7     84   23    1250  10
NRN VRISL    HRDY     14   15     300   2     47   18     950   5
TERRACE      ANT      78   12    1000  13    100   18    2750  16
STEWART      ANT      97   15    1350  12    100   18    2500  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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW   9   SW  19   SW  28
PORT HARDY   SW   9   S   24   S   28
SANDSPIT     S   22   S   22   SW  33

TODAY'S VENTING: GOOD

VENTING FOR TUESDAY: GOOD



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


END/GKP