FPCN39 CWLW 221330
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 22 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      17   15     550   2     50   21    1700   5
KAMLOOPS     KEL      23   15     800   3     50   22    1700   5
OKANAGAN     KEL      16   14     650   3     60   23    1700   5
CASTLEGAR    SPOK     23   14     850   4     60   23    1600   5
CRANBROOK    SPOK      9   12     950  12    100   21    3950   5
REVELSTOKE   KEL      14   13     650   3     34   20    1350   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   VR   5   VR   5
CRANBROOK             VR   5   VR   5

TODAY'S VENTING: FAIR.

VENTING FOR WEDNESDAY: FAIR TO 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   10     950   7     60   19    2550   5
PR. GEORGE   P.G.     10    9     800   1     45   17    2100   5
SMITHERS     P.G.     11    8     750   1     55   17    1050  10
WELLS GRAY   P.G.      9    9    1000   7     55   15    2650   5
FT NLSN      F.N.      9    9     400  11     60   17    1350  12
FT STJOHN    F.N.      9    9     700  11     50   18    2200  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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE
SMITHERS              N   11   N

TODAY'S VENTING: FAIR.

VENTING FOR WEDNESDAY: FAIR.

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     14   15     250   3     21   19     350   5
FRASER VLY   QUIL     14   15     250   3     41   24     800   5
SRN VRISL    QUIL     12   13     150   2     19   19     350   3
CNTRL VRISL  QUIL     13   16     250   2     55   26    1200   6
NRN VRISL    HRDY     11   13     250   1     74   17    1000  10
TERRACE      ANT      10   12     200  22     80   19    1400  12
STEWART      ANT      69   14     600  15     70   17    1250   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   NE  11   N   13
PORT HARDY   N   19   N   22   N   26
SANDSPIT     N   50   N   43   NW  37

TODAY'S VENTING: FAIR.

VENTING FOR WEDNESDAY: FAIR.

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

END/