FPCN39 CWLW 081326
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 WEDNESDAY 8 APRIL 1998 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    6     500   2     90   12    2600   6
KAMLOOPS     KEL      37    7     850   6     96   13    3350   5
OKANAGAN     KEL      23    6     650   5     96   14    3350   5
CASTLEGAR    SPOK     83    8    1300  15    100   13    3500  17
CRANBROOK    SPOK    100    8    3950  18    100   12    3950  18
REVELSTOKE   KEL      77    8    2200   6     96   12    3450   5

*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    VR   5   W   11   SW  11
CRANBROOK             VR   5   W   17

           INVERSION HT    BREAKTHRU TEMP
KELOWNA          970 m          8 C
SPOKANE         1490 m          8 C

TODAY'S VENTING: GOOD.

VENTING FOR THURSDAY: POOR.

VENTING OUTLOOK FRIDAY THRU SUNDAY: FAIR.




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.     69    1    1500  15    100    8    3950  13
PR. GEORGE   P.G.     53    2    1200  11    100    6    3700  13
SMITHERS     P.G.     20    1     700   7     99    6    2050  11
WELLS GRAY   P.G.      9    3    1000   5    100    8    4000  13
FT NLSN      F.N.      9    3     400   4     20    9     650   4
FT STJOHN    F.N.      9    5     700   4     23    8    1050   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   17   W   20
SMITHERS              W   13   W   20

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1460 m          7 C
FT. NELSON      1200 m         12 C

TODAY'S VENTING: POOR NORTHEAST BC OTHERWISE GOOD.

VENTING FOR THURSDAY: FAIR.

VENTING OUTLOOK FRIDAY THRU SUNDAY: POOR FRIDAY
 BECOMING FAIR BY SATURDAY.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     70    9    1900   5     95   14    3100   5
FRASER VLY   QUIL     38    7     950   4     95   14    3050   5
SRN VRISL    QUIL     30    7     750   3     82   12    2600   4
CNTRL VRISL  QUIL     31    7     800   3     88   13    2900   5
NRN VRISL    HRDY     15    5     250   3     72   11    2600   4
TERRACE      ANT     100    6    2500   9    100   11    3200  10
STEWART      ANT      51    5    1150   5    100   11    3000   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    E    9   VR   5   VR   5
PORT HARDY   VR   5   VR   5   VR   5
SANDSPIT     VR   5   VR   5   VR   5

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       280 m          5 C
PORT HARDY       240 m          6 C
ANNETTE          210 m          4 C

TODAY'S VENTING: GOOD.

VENTING FOR THURSDAY: GOOD

VENTING OUTLOOK FRIDAY THRU SUNDAY: FAIR FRIDAY OTHERWISE GOOD.




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


END/MWSO