FPCN39 CWLW 101400
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 MONDAY 10 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      15    8     750   1    100   17    3200   5
KAMLOOPS     KEL      18    9    1250   1    100   17    3350   5
OKANAGAN     KEL      13    7     750   1    100   16    3350   5
CASTLEGAR    SPOK     40    7    1200   5     88   14    3500   4
CRANBROOK    SPOK     37    6    2200   3     86   11    3950   4
REVELSTOKE   KEL      17    8    1200   1    100   16    3450   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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   VR   5   VR   5
CRANBROOK             VR   5   VR   5

TODAY'S VENTING: GOOD.


VENTING FOR TUESDAY: 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    7    3950   7    100   11    3950   7
PR. GEORGE   P.G.     21    4     900   6    100   12    3700   7
SMITHERS     P.G.     17    4     850   2     97   12    3500   5
WELLS GRAY   P.G.    100    4    3500   3    100   11    4000   7
FT NLSN      F.N.      9    5     700   0    100   12    3400  10
FT STJOHN    F.N.     68    7    1700   8    100   13    3700  12

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

FORECAST UPPER WINDS FOR MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SE  13   S   20
SMITHERS              SE  26   SE  20

TODAY'S VENTING: GOOD.


VENTING FOR TUESDAY: GOOD.


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     25    8     300   5     85   14    2000   9
FRASER VLY   QUIL     15    9     250   6     90   18    2400   9
SRN VRISL    QUIL     34    8     350   5     85   14    2150   8
CNTRL VRISL  QUIL     34    8     600   5    100   15    2450   9
NRN VRISL    HRDY     11    6     150   1    100   12    1900  12
TERRACE      ANT      62    6     650  16    100   14    2850  21
STEWART      ANT      60    8     650  11    100   14    2500  18

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

FORECAST UPPER WINDS FOR MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   S   17   S   26
PORT HARDY   SE  30   S   35   S   22
SANDSPIT     SE  74   S   63   S   43

TODAY'S VENTING: GOOD.


VENTING FOR TUESDAY: GOOD.



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


END/GF
$$$$^^