FPCN39 CWLW 031555
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 3 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       9    2     200   0      65   7    1100   8
KAMLOOPS     KEL       9    2     500   0      71   5    1950   5
OKANAGAN     KEL       9    3     650   0      71   5    1950   5
CASTLEGAR    SPOK      9    2     500  13      9    3    1500  13
CRANBROOK    SPOK     10    0     950  30     10    2     950  30
REVELSTOKE   KEL       9    1     500   0      9    2     650   0

*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   11   SW  33   SW  74
CRANBROOK             SW  26   SW  65

TODAY'S VENTING: POOR BECOMING GOOD LATE IN THE DAY.

VENTING FOR THURSDAY: 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    1    2100  27    100    4    2550  24
PR. GEORGE   P.G.     10    1     700  14    100    3    2050  24
SMITHERS     P.G.      9    1     500   1     28    3    1000   5
WELLS GRAY   P.G.     20   -4     1500  8    100    4    4000  21
FT NLSN      F.N.      9   -8     400   0      9   -8     400   0
FT STJOHN    F.N.     44   -8    1250   7     67   -7    1500  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            E   28   SE  37
SMITHERS              E   31   SE  37

TODAY'S VENTING: POOR THIS MORNING ANDFAIR IN THE AFTERNOON EXCEPT
GOOD THROUGH SOUTHERN SECTIONS OF THE CENTRAL INTERIOR.

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    100    8     250  50    100    9     900  50
FRASER VLY   QUIL     58    7     200  51    100    8     600  51
SRN VRISL    QUIL     58    7      50  21    100    9     750  43
CNTRL VRISL  QUIL     58    5      50  21     58    7      50  21
NRN VRISL    HRDY     80    6     650  18     88    7     750  18
TERRACE      ANT      20    2     400  22     49    2     500  22
STEWART      ANT      20    2     350  20     49    2     500  29

*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    SW  48   SW  67   SW  70
PORT HARDY   NW  28   NW  22   NW  15
SANDSPIT     N   44   N   37   N   22

TODAY'S VENTING: GOOD.

VENTING FOR THURSDAY: GOOD.

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


END/LEC