FPCN39 CWLW 151325
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 15 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     200   2    100   29    2300   8
KAMLOOPS     KEL       9   20     350   2    100   29    3350  10
OKANAGAN     KEL       9   18     350   2    100   28    2750  10
CASTLEGAR    SPOK     42   22     850  11    100   31    3500  22
CRANBROOK    SPOK      9   19     950  19    100   29    3950  27
REVELSTOKE   KEL       9   19     450   2    100   27    2750   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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    W    9   W   15   W   19
CRANBROOK             W    9   SW  26

TODAY'S VENTING: GOOD

VENTING FOR SUNDAY: 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.     53   14    1400  12    100   21    3950  12
PR. GEORGE   P.G.     27   14    1000   6     88   19    2150   9
SMITHERS     P.G.      9   12     550   1     37   16    1050   6
WELLS GRAY   P.G.     86   16    2150  11    100   22    4000  12
FT NLSN      F.N.      9   14     400  16    100   22    2750  12
FT STJOHN    F.N.     54   16    1050  15    100   21    2900  12

*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
SMITHERS              VR   5   NE

TODAY'S VENTING: GOOD

VENTING FOR SUNDAY: GOOD


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     96   18    1250  14    100   23    1850  14
FRASER VLY   QUIL     95   18    1200  14    100   24    1900  14
SRN VRISL    QUIL     56   16     700   9    100   23    1800  12
CNTRL VRISL  QUIL     80   17    1000  11    100   24    1900  13
NRN VRISL    QUIL      9   13     100   0     56   16     700   9
TERRACE      ANT       9   12     250   3     48   17    1900   3
STEWART      QUIL      9   14     100   0     79   17     950  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
VANCOUVER    W   19   W   20   W   22
PORT HARDY   W   17   W   20   W   30
SANDSPIT     NW  17   N   19   N   22

TODAY'S VENTING: GOOD

VENTING FOR SUNDAY: GOOD


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


END/MWSO