FPCN39 CWLW 151400
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 PDT SATURDAY 15 MAY 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      20   12     650   3    100   20    3200   9
KAMLOOPS     KEL      40   13    1150   5    100   18    3350   9
OKANAGAN     KEL      18   11     750   3    100   19    3350   9
CASTLEGAR    SPOK     41   11     950   8    100   17    3500   7
CRANBROOK    SPOK     28    8    1150  10    100   13    3950   6
REVELSTOKE   KEL      16   10     700   3    100   17    3450   9

*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    NW   9   NW  20   N   28
CRANBROOK             VR   5   N   19

TODAY'S VENTING: good by noon.


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.     10    7     950  12     96   14    3950   5
PR. GEORGE   P.G.     43    8    1050  11    100   15    3700   7
SMITHERS     P.G.     22    8     850   4     99   14    3500   6
WELLS GRAY   P.G.     33    6    1000   3     96   16    4000   5
FT NLSN      F.N.     33    6     850   6    100   13    3400  14
FT STJOHN    F.N.     40    6    1200   7    100   12    3700  16

*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            VR   5   VR   5
SMITHERS              VR   5   VR   5

TODAY'S VENTING: GOOD IN THE AFTERNOON.

VENTING FOR SUNDAY: GOOD


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     63   11    1100   7     74   15    2000   5
FRASER VLY   QUIL     70   13    1400   7     83   17    2350   5
SRN VRISL    QUIL     60   12    1100   6     77   16    2100   5
CNTRL VRISL  QUIL     58   11    1100   6     82   17    2300   5
NRN VRISL    HRDY     65   10     950   8     75   13    1200   8
TERRACE      ANT      20   11     800   2    100   16    3200   6
STEWART      ANT      20   11     550   2     65   16    2100   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
VANCOUVER    W   19   W   17   W   11
PORT HARDY   W   13   SW   9   SW   9
SANDSPIT     W   11   VR   5   SW  11

TODAY'S VENTING: GOOD IN THE SOUTH. BECOMING GOOD ON
THE NORTH COAST IN THE AFTERNOON.


VENTING FOR SUNDAY: GOOD


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


END/LM
$$$$^^