FPCN39 CWLW 051446
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 5 FEBRUARY 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       9    4     200   2     16    6     500   2
KAMLOOPS     KEL      12    3     450   2     13    5     550   2
OKANAGAN     KEL      12    3     450   2     13    5     550   2
CASTLEGAR    SPOK      9    3     500   3      9    3     500   3
CRANBROOK    SPOK      9    0     950  10      9    2     950  10
REVELSTOKE   KEL       9    1     450   2     10    3     500   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    S    9   S   20   S   37
CRANBROOK             VR   5   SW  24

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.     19    0    1100   6     23    2    1200   6
PR. GEORGE   P.G.      9    0     700   1      9    0     700   1
SMITHERS     P.G.      9   -1     500   4      9    0     500   4
WELLS GRAY   P.G.     19    1    1150   6     24    3    1250   6
FT NLSN      F.N.     35  -11     700   9     34  -10     950   5
FT STJOHN    F.N.     50   -9    1200  10     47   -8    1250   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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   39   S   41
SMITHERS              SE  31   S   41

TODAY'S VENTING: POOR EXCEPT FAIR IN THE PEACE.

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     11    9     100  26     11   10     100  26
FRASER VLY   QUIL     11    8      50  26     11   10      50  26
SRN VRISL    QUIL      9    7       0   5     52   10     350  16
CNTRL VRISL  QUIL      9    6      50   5      9    7      50   5
NRN VRISL    HRDY     25    8     200   8     36   10     400   8
TERRACE      ANT       9    2     200  11      9    2     200  11
STEWART      ANT       9    4       0   7      9    2       0   7

*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    S   33   S   44   S   50
PORT HARDY   SE  70   S   85   S   82
SANDSPIT     SE  52   SE  50   SE  46

TODAY'S VENTING: POOR LOCALLY FAIR WHERE WINDY.

VENTING FOR FRIDAY: POOR

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


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