FPCN39 CWLW 271406
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 27 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      22    6     500   4     84   11    3200   4
KAMLOOPS     KEL      21    5     650   4     84   11    3350   4
OKANAGAN     KEL      66    6    2250   4     84   10    3350   4
CASTLEGAR    SPOK     89    3    1200  20    100    8    3500  22
CRANBROOK    SPOK    100    2    2600  23    100    7    3950  22
REVELSTOKE   KEL      11    3     500   4     84    6    3450   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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    SW   9   SW  20   SW  33
CRANBROOK             W   17   W   41

TODAY'S VENTING: GOOD.

VENTING FOR SUNDAY: 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.    100    0    2300  23    100    5    3950  20
PR. GEORGE   P.G.    100    1    1600  21    100    6    3700  19
SMITHERS     P.G.     64    2    1250  10    100    6    3500  15
WELLS GRAY   P.G.    100    0    2300  23    100    5    4000  20
FT NLSN      F.N.     17    2     700   3     56    5    1350   6
FT STJOHN    F.N.     54    2    1350   9    100    6    3700  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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   26   W   39
SMITHERS              S   13   S   39

TODAY'S VENTING: GOOD.

VENTING FOR SUNDAY: GOOD.


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    HRDY    100    6    1800  16    100    8    2600  18
FRASER VLY   HRDY    100    5    1200  16    100    7    2100  17
SRN VRISL    HRDY     88    5    1000  13    100    7    1950  15
CNTRL VRISL  HRDY     31    3     250  12    100    8    2350  17
NRN VRISL    HRDY     25    3     200   9     88    5    1000  13
TERRACE      ANT      80    2    1050  13    100    4    1850  14
STEWART      ANT      80    2    1000  12     88    4    1050  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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   31   S   41   SW  43
PORT HARDY   S   43   S   46   SW  43
SANDSPIT     SE  44   S   41   S   35

TODAY'S VENTING: GOOD.

VENTING FOR SUNDAY: GOOD.


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


END/MWSO