FPCN39 CWLW 181327
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 TUESDAY 18 AUGUST 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      19   16     500   3    100   24    2900   9
KAMLOOPS     KEL      88   18    1650  10    100   24    3350   9
OKANAGAN     KEL      15   15     550   3    100   24    3350   9
CASTLEGAR    SPOK     14   15     600   3    100   24    3000  10
CRANBROOK    SPOK     13   14     600   3    100   23    3000  10
REVELSTOKE   KEL      12   14     550   3    100   19    2250  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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   W   17   W   20
CRANBROOK             W   11   W   28

TODAY'S VENTING: GOOD




VENTING FOR WEDNESDAY: 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.     74   13    1650  14    100   19    2650  10
PR. GEORGE   P.G.     26   13     900  10    100   18    2450  11
SMITHERS     P.G.      9   13     550   5    100   19    2250  11
WELLS GRAY   P.G.     85   14    2150  11    100   19    2700  10
FT NLSN      F.N.      9   14     400  32     60   21     600  32
FT STJOHN    F.N.     12   15     700  37    100   22    2550  30

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

FORECAST UPPER WINDS FOR TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE
SMITHERS              W   24   W

TODAY'S VENTING: GOOD




VENTING FOR WEDNESDAY: GOOD




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     72   17    1500   6     94   21    2050   8
FRASER VLY   QUIL     48   16     800   6     95   21    2050   8
SRN VRISL    QUIL      9   15     300   0     85   21    2000   6
CNTRL VRISL  QUIL      9   14     100   0     68   19    1750   5
NRN VRISL    HRDY      9   14       0   5     86   19    1900   7
TERRACE      ANT       9   14     250   7     89   20    1550  10
STEWART      ANT      29   15     450   5     79   20    1350   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W   17   W   19   NW  19
PORT HARDY   NW  17   NW  11   NW  20
SANDSPIT     W   19   W   20   W   30

TODAY'S VENTING: GOOD




VENTING FOR WEDNESDAY: GOOD




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


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