FPCN39 CWLW 191356
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 SUNDAY 19 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      13    6     550   1     72   12    1500   7
KAMLOOPS     KEL      25    6     700   5     87   13    1850   9
OKANAGAN     KEL      25    6     700   5     88   14    1900   9
CASTLEGAR    SPOK     23    7     750   6     62   14    1250   6
CRANBROOK    SPOK      9    5    1050   3     56   12    1650   6
REVELSTOKE   KEL      20    6     900   2     72   12    1850   6

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   N   11   N    9
CRANBROOK             VR   5   N    9

           INVERSION HT    BREAKTHRU TEMP
KELOWNA          600 m          6 C
SPOKANE          900 m         11 C

TODAY'S VENTING: GOOD

VENTING FOR MONDAY: FAIR TO GOOD

VENTING OUTLOOK TUESDAY THRU THURSDAY: FAIR TO GOOD



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    0    1050   2     58    8    1500  10
PR. GEORGE   P.G.      9    1     700   2     65    8    1500  10
SMITHERS     P.G.      9    1     650   2     54    7    1350  10
WELLS GRAY   P.G.      9    0    1000   2     58    7    1500  10
FT NLSN      F.N.     33   -2    1050  10     66    0    1200  10
FT STJOHN    F.N.     12   -2     750   2     77   -1    1500  13

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            VR   5   W   17
SMITHERS              SW  24   SW  17

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1000 m          6 C
FT. NELSON      NO INVERSION

TODAY'S VENTING: GOOD

VENTING FOR MONDAY: FAIR TO GOOD

VENTING OUTLOOK TUESDAY THRU THURSDAY: FAIR TO GOOD


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     15    9     250   4     62   14     800   8
FRASER VLY   QUIL     15    9     250   4     75   16    1100   8
SRN VRISL    QUIL     16    8     200   4     55   14     700   8
CNTRL VRISL  QUIL     16    9     200   4     55   14     700   8
NRN VRISL    HRDY      9    7      50   4     72   12    1050   8
TERRACE      ANT       9    5     200   5     49    9    1000   6
STEWART      ANT       9    5       0   2     30    9     200   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    NE  24   E   17   NE   9
PORT HARDY   VR   5   VR   5   NW   9
SANDSPIT     SW  37   SW  39   SW  50

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       400 m         11 C
PORT HARDY       150 m          8 C
ANNETTE          300 m          9 C

TODAY'S VENTING: GOOD BUT FAIR NORTH COAST

VENTING FOR MONDAY: GOOD

VENTING OUTLOOK TUESDAY THRU THURSDAY: GOOD




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


END/MWSO