FPCN39 CWLW 061318
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 6 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      13   13     600   1     46   18    1200   4
KAMLOOPS     KEL      17   12     650   3     46   17    1400   4
OKANAGAN     KEL      10    9     500   1     46   17    1350   4
CASTLEGAR    SPOK     22   10     750   5     40   16    1200   5
CRANBROOK    SPOK      9    8     950   7     55   15    1750   7
REVELSTOKE   KEL      10   10     550   1     17   13     800   3

*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    S   11   S   22   SW  39
CRANBROOK             VR   5   W   22

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.     83   11    1250  39    100   17    2000  38
PR. GEORGE   P.G.      9   11     700  13    100   16    1400  28
SMITHERS     P.G.      9   10     500  13     29   12     550  13
WELLS GRAY   P.G.     79   11    1300  39    100   17    2100  38
FT NLSN      F.N.     10    3     400  15     77    7    1100  15
FT STJOHN    F.N.     85   10    1600  14    100   16    2100  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
PR. GEORGE
SMITHERS              SW  48   S

TODAY'S VENTING: GOOD

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     21   15     250   8     75   19    1050  10
FRASER VLY   QUIL     24   16     250   8     79   22    1150  10
SRN VRISL    QUIL     15   13     100   8     52   18     650   8
CNTRL VRISL  QUIL     15   13     100   8     33   17     350   8
NRN VRISL    HRDY      9   12       0  12     25   15     150  12
TERRACE      ANT      43    9     700   8     53   10     950   7
STEWART      ANT      27   10     350   6     27   10     350   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
VANCOUVER    SE  24   S   43   S   56
PORT HARDY   S   56   S   67   SW  72
SANDSPIT     S   52   SW  59   SW  59

TODAY'S VENTING: FAIR

VENTING FOR WEDNESDAY: FAIR

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

END/MWSO