FPCN39 CWLW 201427
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 SATURDAY 20 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      15    9     800   1     22   18    1500   1
KAMLOOPS     KEL      14    8     850   1     21   17    1550   1
OKANAGAN     KEL      13    7     800   1     21   17    1550   1
CASTLEGAR    SPOK     19    8     750   4     49   17    1050   9
CRANBROOK    SPOK      9    8     950  16     21   19    2150   1
REVELSTOKE   KEL      12    6     800   1     18   12    1400   1

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    SE   9   SE  22   S   39
CRANBROOK             VR   5   S   22

TODAY'S VENTING: POOR.

VENTING FOR SUNDAY: FAIR TO GOOD.


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.     10    6     950  26     21   14    2150   1
PR. GEORGE   P.G.     32    5     900  12     21   13    1900   1
SMITHERS     P.G.     20    4     700   6     51    8    1000  11
WELLS GRAY   P.G.      9    4    1000   0     21   15    2200   1
FT NLSN      F.N.     10    0     500   1     22    7     850   3
FT STJOHN    F.N.      9    3     700   5     71    8    2000   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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   31   S   41
SMITHERS              S   33   S   41

TODAY'S VENTING: POOR TO FAIR.

VENTING FOR SUNDAY: FAIR TO GOOD.


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9    9     100   7     22   14     300   7
FRASER VLY   QUIL     21   13     250   7     31   18     400   7
SRN VRISL    QUIL     14    9     100   7     27   15     300   7
CNTRL VRISL  QUIL      9    7      50   7     23   13     250   7
NRN VRISL    HRDY     14    7     150   4     28   13     450   5
TERRACE      ANT       9    4     250   2      9    4     250   4
STEWART      ANT       9    4      50   1      9    4      50   1

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SE  17   S   35   S   39
PORT HARDY   S   30   S   50   S   56
SANDSPIT     S   52   S   70   S   83

TODAY'S VENTING: POOR.

VENTING FOR SUNDAY: FAIR TO GOOD.


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


END/MWSO