FPCN39 CWLW 081331
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 THURSDAY 8 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      32   13     500  20     53   19    1300   3
KAMLOOPS     KEL      22   13     550   8     52   18    1400   9
OKANAGAN     KEL       9   12     550   0     33   16    1100   6
CASTLEGAR    SPOK      9   12     500   6     28   15     850   6
CRANBROOK    SPOK      9    9     950   2     37   14    1100   8
REVELSTOKE   KEL       9   10     500   0     22   13     750   1

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

FORECAST UPPER WINDS FOR THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    SW  15   W   28   W   46
CRANBROOK             SW  17   SW  48

TODAY'S VENTING: FAIR

VENTING FOR FRIDAY: 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.     24    9    1850   3     61   12    2150   9
PR. GEORGE   P.G.     29    8    1000   6     54   10    1400   8
SMITHERS     P.G.      9    4     500   3     41   10    1100   6
WELLS GRAY   P.G.     76   10    1900   8     66   13    2500   9
FT NLSN      F.N.      9    0     400  11     47    1     950  10
FT STJOHN    F.N.     53    1    1450   7     61    2    1650  10

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

FORECAST UPPER WINDS FOR THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE
SMITHERS              E   11   S

TODAY'S VENTING: FAIR TO GOOD

VENTING FOR FRIDAY: FAIR


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     11   12     100  10     60   15     700  13
FRASER VLY   QUIL     11   14      50   8     52   18    1400  10
SRN VRISL    QUIL      9   11       0   7     62   16     800  15
CNTRL VRISL  QUIL      9   13      50   7     50   15     550   9
NRN VRISL    HRDY      9    8      50   7     48   12     300  15
TERRACE      ANT       9    7     200   4     31   10     750   4
STEWART      ANT      10    9      50   2     12   10     150   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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  22   SW  33   SW  44
PORT HARDY   S   11   SW  15   SW  17
SANDSPIT     SW  11   SW   9   VR   5

TODAY'S VENTING: FAIR TO GOOD


VENTING FOR FRIDAY: FAIR



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


END/MWSO