FPCN39 CWLW 141330
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 WEDNESDAY 14 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      12   10     450   1     33   13     550   1
KAMLOOPS     KEL       9    8     350   1     55   14    1200   7
OKANAGAN     KEL       9    8     350   1     55   14    1150   7
CASTLEGAR    SPOK     68   11    1000  16     77   13    1150  16
CRANBROOK    SPOK     10    8     950  25    100   13    3950  21
REVELSTOKE   KEL      10    9     500   1     18   12     650   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    W    9   W   19   W   28
CRANBROOK             SW   9   W   26

TODAY'S VENTING: FAIR




VENTING FOR THURSDAY: 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.      9    6     950   9    100   12    3950  10
PR. GEORGE   P.G.     21    7     950   4     66   10    1850   7
SMITHERS     P.G.      9    4     500   2     41    9    1050   4
WELLS GRAY   P.G.     77    8    2150   9    100   11    4000  10
FT NLSN      F.N.      9    1     400  11     52    3     900  11
FT STJOHN    F.N.     40    2    1000  11     47    6    1100  11

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

FORECAST UPPER WINDS FOR WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            VR   5   W   17
SMITHERS              W   11   W   17

TODAY'S VENTING: FAIR




VENTING FOR THURSDAY: FAIR




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     54   11     450  16    100   14    1600  19
FRASER VLY   QUIL     51   11     400  16    100   14    1500  19
SRN VRISL    QUIL      9   10     100   0    100   14    1300  15
CNTRL VRISL  QUIL      9   10     100   0    100   15    1750  16
NRN VRISL    HRDY     17   10     200   5    100   13    1550  15
TERRACE      ANT      10    7     250  14    100   11    1750  13
STEWART      ANT      19    9     200   5     84   11    1150  11

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

FORECAST UPPER WINDS FOR WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  22   W   26   W   30
PORT HARDY   W   30   W   39   NW  41
SANDSPIT     NW  50   NW  54   NW  48

TODAY'S VENTING: GOOD




VENTING FOR THURSDAY: GOOD




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


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