FPCN39 CWLW 131327
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 13 SEPTEMBER 1999 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      28   18     850   3     74   29    2000   5
KAMLOOPS     KEL      23   16     800   3     58   25    1750   5
OKANAGAN     KEL      14   12     600   2     45   22    1450   4
CASTLEGAR    SPOK     23    9     500   2     42   25    2800   5
CRANBROOK    SPOK     25    7    1000   2     45   22    2800   2
REVELSTOKE   KEL      17   14     700   3     44   22    1500   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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   VR   5   NE   9
CRANBROOK             VR   5   NE  11

TODAY'S VENTING: poor becoming fair to good in the afternoon.


VENTING FOR TUESDAY: FAIR



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     70   20    2050   6
PR. GEORGE   P.G.     23   11     850   8     95   21    1850   4
SMITHERS     P.G.     12   10     800   1     31   18    1000   5
WELLS GRAY   P.G.      9   12    1700   4    100   20    2100  16
FT NLSN      F.N.     22   14     550   8     88   22    1400  13
FT STJOHN    F.N.      9   13     700  14    100   20    1800  16

*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            S    9   VR   5
SMITHERS              S   20   S    5

TODAY'S VENTING:good.




VENTING FOR TUESDAY: FAIR


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     30   25     300   4     80   24    1000   5
FRASER VLY   HRDY     36   19     350  11     86   29      90  13
SRN VRISL    HRDY     23   18     250   6     56   26     650  10
CNTRL VRISL  HRDY     33   18     250  11     71   27     750  13
NRN VRISL    HRDY     10   12     100   1     23   18     250   6
TERRACE      ANT       9   14     200   8     43   20     800   7
STEWART      ANT      12   12     150   2     35   20     600   5

*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    E   20   E   20   E   15
PORT HARDY   VR   5   S   20   S   22
SANDSPIT     W   11   SW  24   S   39

TODAY'S VENTING: good




VENTING FOR TUESDAY: FAIR



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

END/LM