FPCN39 CWLW 171417
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 WEDNESDAY 17 MARCH 1999 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      16    0     550   5    100    6    3050  15
KAMLOOPS     KEL      29    0    1050  10    100    6    3350  12
OKANAGAN     KEL       9    0     850   2    100    6    3350  10
CASTLEGAR    SPOK     18    0     800   2     88    5    2500   9
CRANBROOK    SPOK      9    0     950   7    100    4    2350  14
REVELSTOKE   KEL      10    0     600   2     23    4    1150   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    S    9   SW  24   SW  52
CRANBROOK             SW  17   SW  46

TODAY'S VENTING: GOOD

VENTING FOR THURSDAY: 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.     38   -2    1500   8    100    4    3950  20
PR. GEORGE   P.G.     24   -1    1000   5    100    4    3700  18
SMITHERS     P.G.     14   -2     850   2    100    3    3350   8
WELLS GRAY   P.G.     10   -3     850   5    100    4    4000  15
FT NLSN      F.N.     14   -1     500   5    100    6    3400   7
FT STJOHN    F.N.      9   -8     750   2     75    1    3350  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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   35   SW  57
SMITHERS              SE  28   S   57

TODAY'S VENTING: GOOD

VENTING FOR THURSDAY: GOOD

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     35    6     800  13    100    8    3400  30
FRASER VLY   QUIL     25    6     600   9    100    7    3200  12
SRN VRISL    QUIL     25    6     600   7    100    8    3400  19
CNTRL VRISL  QUIL    100    6    3050  16    100    8    3800  21
NRN VRISL    HRDY    100    5    2950  31    100    6    3150  31
TERRACE      ANT      75    0    2300  18    100    3    3200  18
STEWART      ANT       9    0     600   2     50    2    2450   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   35   SW  48   SW  52
PORT HARDY   S   80   S   98   SW  91
SANDSPIT     E   43   E   41   E   28

TODAY'S VENTING: GOOD

VENTING FOR THURSDAY: POOR

VENTILATION GUIDELINES:
          0-33.....POOR
          34-54.....FAIR
          55-100.....GOOD.

VENTILATION INDICES NORMALLY DROP TO POOR AFTER SUNSET.

END/WJW