FPCN39 CWLW 131337
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 13 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   11     500   1     49   14     900  15
KAMLOOPS     KEL      11   11     550   1     37   16    1500   3
OKANAGAN     KEL      11   10     500   1     39   13    1050   5
CASTLEGAR    SPOK      9   10     500   3     29   13     850   5
CRANBROOK    SPOK      9    7     950  25     48   14    1350   5
REVELSTOKE   KEL      10    9     500   1     34   11     800   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    SW   9   SW  22   W   43
CRANBROOK             W   15   W   43

TODAY'S VENTING: FAIR

VENTING FOR WEDNESDAY: 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.     39    8     600  12     60   12    1100  15
PR. GEORGE   P.G.     29    8     700   6     54   11    1200   7
SMITHERS     P.G.     19    6     500   7     41    9     750   7
WELLS GRAY   P.G.     15    3     200  10     35    6     600  10
FT NLSN      F.N.     31    2     700   8     55    6    1300   8
FT STJOHN    F.N.     39    3    1300   6     45    6    1350   6

*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            SW  37   W   43
SMITHERS              SW  31   SW  43

TODAY'S VENTING: FAIR

VENTING FOR WEDNESDAY: 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  25     31   15     200  25
FRASER VLY   QUIL      9   11      50  13     27   13     200  13
SRN VRISL    QUIL      9   12       0  12     71   15     550  17
CNTRL VRISL  QUIL     24   13     150  13     71   15     550  17
NRN VRISL    HRDY     12   11     200   8     35   13     550   6
TERRACE      ANT       9    7     200  22     39    9     350  22
STEWART      ANT       9    6     150   8     39    9     250  13

*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   28   W   37   SW  41
PORT HARDY   W   33   W   39   SW  48
SANDSPIT     SW  39   SW  46   W   44

TODAY'S VENTING: GOOD NEAR EXPOSED COAST OTHERWISE FAIR.


VENTING FOR WEDNESDAY: GOOD

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


END/MWSO