FPCN39 CWLW 261330
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 PST MONDAY 26 OCTOBER 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      24   11     600   4     27   14     750   4
KAMLOOPS     KEL      12    7     500   2     22   12     700   4
OKANAGAN     KEL      13    7     500   2     22   12     700   4
CASTLEGAR    SPOK     16    7     750   3     32   10     900   7
CRANBROOK    SPOK      9    5     950  15     34    9    1100  15
REVELSTOKE   KEL      11    6     500   2     12    8     600   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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SW   9   W   19
CRANBROOK             W    9   NW  20

TODAY'S VENTING: POOR

VENTING FOR TUESDAY: 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.     10    6     950  16    100   11    3950  31
PR. GEORGE   P.G.      9    5     700   2     70   11    1250  15
SMITHERS     P.G.      9    6     500   2     77    9    1200  15
WELLS GRAY   P.G.     10    6    1000  16    100   12    4000  31
FT NLSN      F.N.      9    4     400  41    100   13    1050  41
FT STJOHN    F.N.     12    5     700  42    100   11    2300  51

*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            SW  26   SW  56
SMITHERS              SE  22   S   56

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     29   13     250  11     66   15     600  16
FRASER VLY   QUIL     25   13     200  11     70   16     650  15
SRN VRISL    QUIL     11   13     150   2     61   16     600  12
CNTRL VRISL  QUIL      9   11      50   2     12   13     150   2
NRN VRISL    HRDY      9   10       0   9      9   12       0   9
TERRACE      ANT      10    7     250  15    100    9    1800  15
STEWART      ANT      27    9     650   3     27    9     650   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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SE  13   S   15   SW  28
PORT HARDY   S   46   S   57   SW  65
SANDSPIT     SE  57   S   65   S   89

TODAY'S VENTING: FAIR TO POOR

VENTING FOR TUESDAY: POOR

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

END/MWSO