FPCN39 CWLW 281400
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 28 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      72   17    2250   4     96   24    3200   5
KAMLOOPS     KEL      60   14    1900   4     96   22    3350   5
OKANAGAN     KEL      40   13    1550   3     96   23    3350   5
CASTLEGAR    SPOK     94   16    3500   5     94   25    3500   5
CRANBROOK    SPOK     93   13    3950   5     93   24    3950   5
REVELSTOKE   KEL      34   11    1350   3     96   23    3450   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   SW  22   W   44
CRANBROOK             SW  19   SW  46

TODAY'S VENTING: GOOD




VENTING FOR WEDNESDAY: 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.     50    9    1550   8    100   17    3950  20
PR. GEORGE   P.G.     77    9    1200  20    100   16    3700  24
SMITHERS     P.G.     61    9    1100  12    100   15    2300  20
WELLS GRAY   P.G.     50    7    1600  10    100   10    2300  26
FT NLSN      F.N.      9    9     400   0    100   14    3400  10
FT STJOHN    F.N.     98   10    2250  11    100   15    3700  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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  48   W   61
SMITHERS              SW  69   SW  61

TODAY'S VENTING: GOOD




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     22   15     700   2    100   22    3100  10
FRASER VLY   QUIL     24   16     800   2    100   23    3050  10
SRN VRISL    QUIL     30   16     750   3    100   22    3000   9
CNTRL VRISL  QUIL     50   17     900   6    100   22    3050   9
NRN VRISL    HRDY     53   13     550  11    100   19    2100  16
TERRACE      ANT     100   10    1500  41    100   14    2050  44
STEWART      ANT     100   10    1200  29    100   13    1650  39

*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    SE  13   SW  30   W   44
PORT HARDY   S   54   SW  69   SW  80
SANDSPIT     SW  65   SW  72   SW  78

TODAY'S VENTING: GOOD




VENTING FOR WEDNESDAY: FAIR




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


END/
$$$$^^