FPCN39 CWLW 051407
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 5 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      12   12     450   1     77   15    1650   7
KAMLOOPS     KEL      33   12     850   5     89   15    2100   8
OKANAGAN     KEL      11   11     600   1     73   13    1400   7
CASTLEGAR    KEL       9   10     500   6     77   12    1750   8
CRANBROOK    KEL      70    8    1850  10    100   11    2500  13
REVELSTOKE   KEL       9    9     450   1     67   11    1500   9

*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   W   19   NW  33
CRANBROOK             W    9   NW  24

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         NO INVERSION
SPOKANE         NOT AVAILABLE

TODAY'S VENTING: GOOD.

VENTING FOR MONDAY: GOOD.

VENTING OUTLOOK TUESDAY THRU THURSDAY: 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.     25    4    1200   7     80    9    2500  12
PR. GEORGE   P.G.     24    5     950   6     81   11    2450  11
SMITHERS     P.G.     23    4     850   5     65    9    1600   7
WELLS GRAY   P.G.     95    6    2250  13     90   10    2800  12
FT NLSN      F.N.     41    2     550  20     59    6    1500  12
FT STJOHN    F.N.      9   -1     700  19     79    9    1500  15

*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            SW  44   W   63
SMITHERS              SW  46   W   63

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1100 m          7 C
FT. NELSON       700 m          7 C

TODAY'S VENTING: GOOD.

VENTING FOR MONDAY: GOOD.

VENTING OUTLOOK TUESDAY THRU THURSDAY: GOOD.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     73   13     550  20    100   15    1550  24
FRASER VLY   QUIL      9   12      50  12    100   15    1500  24
SRN VRISL    QUIL     15   13     100   7    100   16    1550  22
CNTRL VRISL  QUIL      9   11      50   7    100   15    1500  22
NRN VRISL    HRDY      9   11       0   3     73   13     700  13
TERRACE      ANT      57    8     500  22     99   10     950  23
STEWART      ANT       9    9       0   6     56   10     500  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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W   22   NW  30   NW  37
PORT HARDY   W   37   W   50   W   61
SANDSPIT     W   69   W   76   W   78

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      NO INVERSION
PORT HARDY       100 m         12 C
ANNETTE         NO INVERSION

TODAY'S VENTING: GOOD.

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/JMS