FPCN39 CWLW 151319
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 15 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      16    8     500   2     75   13    1900   6

KAMLOOPS     KEL      12    7     500   2    100   13    2900   9

OKANAGAN     KEL      12    7     500   2    100   13    2900   9

CASTLEGAR    SPOK     36    7    1000   6     58   11    1550   6

CRANBROOK    SPOK     18    6     940   5     57   11    1650   6

REVELSTOKE   KEL      11    7     550   2     56   10    1650   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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    NW  11   NW  24   N   33
CRANBROOK             VR   5   NW  20

TODAY'S VENTING: GOOD

VENTING FOR FRIDAY: 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    3     950   8    100   10    3950  10

PR. GEORGE   P.G.      9    2     900   0     61    8    1850   6

SMITHERS     P.G.      9    2     800   0     35    7    1100   3

WELLS GRAY   P.G.     61    5    1900   8    100   10    4000  10

FT NLSN      F.N.      9    1     400   7     41    3     900   7

FT STJOHN    F.N.     36    2    1100   7     67    5    1650   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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            VR   5   NW   9
SMITHERS              S   13   SW   9

TODAY'S VENTING: FAIR TO GOOD

VENTING FOR FRIDAY: GOOD

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     32    9     200  24    100   13    1450  24

FRASER VLY   QUIL     66   11     400  24    100   15    2000  24

SRN VRISL    QUIL     30    9     150   0     70   14    1650   0

CNTRL VRISL  QUIL     28    9     150   0     75   13    1150   0

NRN VRISL    HRDY     12    9     100   4     79   12    1150   9

TERRACE      ANT       9    6     200   2     50    9    1450   2

STEWART      ANT      11    8     200   1     42    9    1300   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
VANCOUVER    VR   5   VR   5   N   11
PORT HARDY   VR   5   NW  11   NW  20
SANDSPIT     S   50   SW  37   W   54

TODAY'S VENTING: FAIR TO GOOD

VENTING FOR FRIDAY: GOOD

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

END/MWSO