FPCN39 CWLW 251340
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 TUESDAY 25 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   18     500   0     96   26    3200   8
KAMLOOPS     KEL       9   14     350   0     96   27    3350   8
OKANAGAN     KEL       9   17     500   0     96   26    3350   8
CASTLEGAR    SPOK     11   18     850   1     63   27    2600   5
CRANBROOK    SPOK      9   16     950   5     95   25    3950   5
REVELSTOKE   KEL       9   15     500   0     70   22    2750   3


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

FORECAST UPPER WINDS FOR TUESDAY AFTERNOON (WINDS IN KM/H):
             900M     1800M    2700M
PENTICTON    VR   5   W   13   SW  19
CRANBROOK             VR   5   SW  17

TODAY'S VENTING: GOOD
VENTING FOR WEDNESDAY: 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.      9   11     950   2     90   20    3950   8
PR. GEORGE   P.G.      9   12     700   2     89   17    1850   7
SMITHERS     P.G.      9   13     550   2     91   17    1850   6
WELLS GRAY   P.G.      9   13    1000   2     70   20    3200   3
FT NLSN      F.N.     13   11     450   4     98   16    3600   4
FT STJOHN    F.N.      9   12     700   4     83   19    2700   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900M     1800M    2700M
PR. GEORGE
SMITHERS              W   24   W

TODAY'S VENTING: GOOD
VENTING FOR WEDNESDAY: GOOD


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  TMP  MXG HT  WND    VI  TMP  MXG HT  WND
                               (MASL)  (KT)            (MASL)  (KT)
VANCOUVER    QUIL     10   16     700   4     72   21     950  10
FRASER VLY   QUIL     19   16     650   4     82   23    1250  10
SRN VRISL    QUIL     12   15     450   3     66   21     900   9
CNTRL VRISL  QUIL     12   15     450   3     65   21     900   9
NRN VRISL    HRDY      9   14     150   5     56   17     550  11
TERRACE      ANT      10   12     250   3     88   17    1300  12
STEWART      ANT      13   14     100   4     63   17     800   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900M     1800M    2700M
VANCOUVER    W   11   W   15   W   22
PORT HARDY   NW  20   W   17   W   24
SANDSPIT     W   28   NW  30   NW  37

TODAY'S VENTING: GOOD
VENTING FOR WEDNESDAY: GOOD


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


END/TAL