FPCN39 CWLW 141349
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 14 OCTOBER 1997 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      50   13     850  15     70   15    1150  20
KAMLOOPS     KEL      26   10     750   5     58   14    1350   8
OKANAGAN     KEL      26   10     750   5     53   14    1350   5
CASTLEGAR    SPOK     15   10     850   6     40   14    1050   6
CRANBROOK    SPOK      9    9    1050   5     38   11    1200  12
REVELSTOKE   KEL       9    7     450   1     21    9     750   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   W   17   W   35
CRANBROOK             W   13   NW  39

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         1000 m         12 C
SPOKANE         1200 m         13 C

TODAY'S VENTING: FAIR TO GOOD.

VENTING FOR WEDNESDAY: FAIR

VENTING OUTLOOK THURSDAY THRU SATURDAY: 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.     15    6    1000   5     35    9    1250   8
PR. GEORGE   P.G.     30    8     750  10     44   10     900  10
SMITHERS     P.G.     10    4     600   3     34    9     800   8
WELLS GRAY   P.G.     12    3    1100   8     46    8    1400  10
FT NLSN      F.N.      9   -3     400   3     21    0     900   7
FT STJOHN    F.N.     12   -2     800   5     35    5    1500   7

*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            W   33   W   50
SMITHERS              SW  33   SW  50

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE       MSG           MSG
FT. NELSON      1500 m         14 C

TODAY'S VENTING: FAIR

VENTING FOR WEDNESDAY: FAIR

VENTING OUTLOOK THURSDAY THRU SATURDAY: FAIR TO GOOD.

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     45   12     450  12     66   14     850  13
FRASER VLY   QUIL     43   12     400  12     65   15    1000   8
SRN VRISL    QUIL     43   13     550   8     66   15     900  11
CNTRL VRISL  QUIL      9   11     150   0     31   12     350   8
NRN VRISL    HRDY     32   12     250  10     42   13     400  10
TERRACE      ANT       9   10     250   5     40   11     250   8
STEWART      ANT      11    5      50   5     21   10      50   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
VANCOUVER    S   17   SW  30   W   35
PORT HARDY   S   33   SW  33   SW  41
SANDSPIT     S   52   S   50   SW  56

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       250 m         11 C
PORT HARDY      NO INVERESION
ANNETTE          150 m         11 C

TODAY'S VENTING: FAIR TO GOOD.

VENTING FOR WEDNESDAY: FAIR.

VENTING OUTLOOK THURSDAY THRU SATURDAY: FAIR.

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


END/MWSO