FPCN39 CWLW 011414
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 1 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      42   10    1050   4     75   14    2300   5
KAMLOOPS     KEL      34    8    1000   4     69   12    2200   5
OKANAGAN     KEL      19    7     750   3     69   12    2200   5
CASTLEGAR    SPOK     28    8     850   6     55   11    1650   5
CRANBROOK    SPOK     21    6    1450   3     87   10    2650   8
REVELSTOKE   KEL      30    7     950   4     67   11    2200   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   VR   5   VR   5
CRANBROOK             VR   5   SW   9

           INVERSION HT    BREAKTHRU TEMP
KELOWNA          800 m          7 C
SPOKANE          700 m          7 C

TODAY'S VENTING: GOOD.

VENTING FOR THURSDAY: GOOD.

VENTING OUTLOOK FRIDAY THRU SUNDAY: GENERALLY 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    3    3950   9    100    8    3950   9
PR. GEORGE   P.G.     22    0     800   9    100    8    3700   9
SMITHERS     P.G.     36    2     850   9    100    8    3500   9
WELLS GRAY   P.G.     70    2    2450   6    100    9    4000   9
FT NLSN      F.N.     16   -1     500   6     81    8    1800   8
FT STJOHN    F.N.     12   -1     750   6     71    8    1800   8

*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            VR   5   S   13
SMITHERS              S   15   S   13

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE       900 m          4 C
FT. NELSON       msg m        msg C

TODAY'S VENTING: GOOD

VENTING FOR THURSDAY: GOOD

VENTING OUTLOOK FRIDAY THRU SUNDAY: GENERALLY GOOD.

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     52    8    1100   5     79   12    1800   6
FRASER VLY   QUIL     33    7     600   5     78   12    1800   6
SRN VRISL    QUIL     48    8    1000   5     75   12    1700   6
CNTRL VRISL  QUIL     21    7     300   4     75   12    1700   6
NRN VRISL    HRDY     37    7     350   9     84   10    1400   9
TERRACE      ANT       9    3     200   8    100    9    2100  12
STEWART      ANT      32    6     400   6     88    9    1450   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    VR   5   VR   5   S   19
PORT HARDY   VR   5   VR   5   S    9
SANDSPIT     S   26   SW  24   SW  19

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       280 m          7 C
PORT HARDY       100 m          7 C
ANNETTE          NONE

TODAY'S VENTING: GOOD

VENTING FOR THURSDAY: GOOD

VENTING OUTLOOK FRIDAY THRU SUNDAY: GENERALLY GOOD.

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


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