FPCN39 CWLW 131515
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 PST THURSDAY 13 NOVEMBER 1997 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       9    0     200   0     28    4    1200   2
KAMLOOPS     KEL       9    0     400   0     25    2    1200   2
OKANAGAN     KEL       9    1     400   0     25    2    1200   2
CASTLEGAR    SPOK     19    2     850   3     33    5    1000   5
CRANBROOK    SPOK      9   -5    1050  32     15    1    1000   5
REVELSTOKE   KEL       9    0     450   0     24    3    1200   2

*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    SE   9   SE  22   SE  35
CRANBROOK             E   13   SE  37

TODAY'S VENTING: POOR.

VENTING FOR FRIDAY: POOR

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.     16   -7    1200   3     17   -6    1200   3
PR. GEORGE   P.G.     23   -5    1200   3     24   -3    1200   3
SMITHERS     P.G.     27   -4    1150   3     29   -1    1250   3
WELLS GRAY   P.G.     17   -4    1250   3     17   -4    1250   3
FT NLSN      F.N.      9   -9     400   5      9   -5     400   5
FT STJOHN    F.N.      9   -3     700   5      9    0     700   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
PR. GEORGE            SE  39   SE  43
SMITHERS              SE  48   SE  43

TODAY'S VENTING: POOR.

VENTING FOR FRIDAY: POOR

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9    4     100   5     38    9     250   8
FRASER VLY   QUIL      9    7      50   5     42   13     300  15
SRN VRISL    QUIL      9    5       0   7     25   10     250   7
CNTRL VRISL  QUIL      9    3      50   7     17    5     150   7
NRN VRISL    HRDY     17    7     200   5     33   11     350   8
TERRACE      ANT       9    2     200  11     52    5     200  17
STEWART      ANT       9    4       0   4     21    5      50   4

*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    SE  35   SE  48   SE  54
PORT HARDY   SE  63   SE  72   SE  67
SANDSPIT     SE  57   SE  63   SE  69

TODAY'S VENTING: FAIR TO POOR.

VENTING FOR FRIDAY: FAIR TO POOR

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


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