FPCN39 CWLW 161326
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 16 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       9   17     500   0     34   29    1300   2
KAMLOOPS     KEL       9   17     500   0     55   29    2000   3
OKANAGAN     KEL       9   16     500   0     33   28    1450   2
CASTLEGAR    SPOK      9   19     500  13     93   30    1750  12
CRANBROOK    SPOK      9   17     950  10    100   29    3950  11
REVELSTOKE   KEL       9   16     500   0     27   26    1200   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SW  13   SW  22
CRANBROOK             SW  15   W   31

TODAY'S VENTING: GOOD TO POOR




VENTING FOR THURSDAY: 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.      9    8     950   6    100   19    3950  13
PR. GEORGE   P.G.      9    9     700   2     55   15    1600   6
SMITHERS     P.G.      9    8     550   2     39   14    1050   7
WELLS GRAY   P.G.     26   11    1300   6    100   20    4000  13
FT NLSN      F.N.      9    6     400   5     26   12     750   5
FT STJOHN    F.N.      9    9     700   5     96   13    2300  10

*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              NE   9   N

TODAY'S VENTING: GOOD TO FAIR EXCEPT POOR FT NLSN




VENTING FOR THURSDAY: POOR




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     34   15     550   6     62   20     950   8
FRASER VLY   QUIL     45   17     700   7     79   25    1300   9
SRN VRISL    QUIL     23   14     350   4     58   21    1000   7
CNTRL VRISL  QUIL     26   15     500   4     73   25    1300   7
NRN VRISL    HRDY      9   11       0   0     15   17     450   2
TERRACE      ANT       9   11     200   8     81   18    1600   8
STEWART      ANT      22   12     200   7     79   18    1350   8

*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    SE   9   S   19   S   31
PORT HARDY   VR   5   S   11   S   15
SANDSPIT     N   33   NE  24   NE  20

TODAY'S VENTING: GOOD EXCEPT POOR NRN VRISL




VENTING FOR THURSDAY: POOR




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


END/WJW