FPCN39 CWLW 201426
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 MONDAY 20 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      19    5     700   3     34   11    1350   2
KAMLOOPS     KEL      12    5     600   3     33   11    1450   2
OKANAGAN     KEL      18    5     800   2     35   12    1500   2
CASTLEGAR    SPOK     20    6     800   4     40   12    1050   6
CRANBROOK    SPOK      9    3     950   9     32   10    1200   9
REVELSTOKE   KEL      13    3     650   2     28    8    1300   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   VR   5   W   15
CRANBROOK             VR   5   NW  20

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         1100 m         17 C
SPOKANE         1100 m         13 C

TODAY'S VENTING: FAIR LOCALLY POOR

VENTING FOR TUESDAY: FAIR

VENTING OUTLOOK WEDNESDAY THRU FRIDAY: 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.     11    3    1000   2     55    8    1500   8
PR. GEORGE   P.G.     22    3     850   8     30    6    1000   7
SMITHERS     P.G.     12    3     800   1     35    6     950   7
WELLS GRAY   P.G.      9    3    1050   5     55    7    1450   8
FT NLSN      F.N.     12   -4     600   3     28    2     800   5
FT STJOHN    F.N.     10    1     850   5     30    4     950   8

*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            W   30   W   48
SMITHERS              SW  54   W   48

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1300 m         13 C
FT. NELSON      1200 m         13 C

TODAY'S VENTING: POOR TO FAIR

VENTING FOR TUESDAY: FAIR

VENTING OUTLOOK WEDNESDAY THRU FRIDAY: GOOD


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9    8     100   2     40   14     850   5
FRASER VLY   QUIL      9    8      50   2     49   16     900   6
SRN VRISL    QUIL     14    8     200   3     29   14     800   3
CNTRL VRISL  QUIL     14    9     200   3     40   15     900   4
NRN VRISL    HRDY     12    7     100   4     34   12     750   4
TERRACE      ANT       9    6     200   5     37    8     450   5
STEWART      ANT       9    5       0   5     19    8     100   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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   VR   5   W   17
PORT HARDY   SW   9   SW  24   W   31
SANDSPIT     SW  59   SW  56   SW  57

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      1000 m         19 C
PORT HARDY      1000 m         19 C
ANNETTE         1900 m         17 C

TODAY'S VENTING: FAIR

VENTING FOR TUESDAY: FAIR

VENTING OUTLOOK WEDNESDAY THRU FRIDAY: FAIR TO GOOD

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


END/MWSO