FPCN39 CWLW 281335
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 SATURDAY 28 MARCH 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      36    4     850   4     96   11    3200   5
KAMLOOPS     KEL      53    4    1250   6     96   10    3350   5
OKANAGAN     KEL      27    2     800   4     96   10    3350   5
CASTLEGAR    SPOK     27    3     900   5     80    8    3500   4
CRANBROOK    SPOK      9    0     950   3     77    6    3950   3
REVELSTOKE   KEL      35    2    1000   5     87    7    2750   6

*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    VR   5   N   17   N   26
CRANBROOK             VR   5   NE  11

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         1520 m          7 C
SPOKANE         1300 m          5 C

TODAY'S VENTING: FAIR BECOMING GOOD THIS AFTERNOON.

VENTING FOR SUNDAY: FAIR.

VENTING OUTLOOK MONDAY THRU WEDNESDAY: 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.    100    0    2750  10    100    7    3950  11
PR. GEORGE   P.G.     70    1    1400  12    100    6    3700  11
SMITHERS     P.G.     42    1     950   9    100    5    3500  10
WELLS GRAY   P.G.      9    1    1000  11    100    7    4000  11
FT NLSN      F.N.     42    1     850   8    100    6    3400  23
FT STJOHN    F.N.     89    0    1450  19    100    6    3700  25

*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            NW  19   NW  22
SMITHERS              NW  13   NW  22

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1100 m          3 C
FT. NELSON       900 m          3 C

TODAY'S VENTING: GOOD.

VENTING FOR SUNDAY: FAIR EXCEPT GOOD EAST OF THE ROCKIES.

VENTING OUTLOOK MONDAY THRU WEDNESDAY: FAIR BECOMING POOR WEDNESDAY.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     48    5     600   9    100    9    2200   9
FRASER VLY   QUIL     45    5     500   9    100   11    3050   8
SRN VRISL    QUIL     65    7    1050   7    100   10    2400   8
CNTRL VRISL  QUIL      9    5     400   0     93    9    1950   8
NRN VRISL    HRDY     73    5     600  15    100    9    1800  14
TERRACE      ANT      53    4    1350   5    100    9    2800  10
STEWART      ANT      37    5     800   4     86    9    1950   7

*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    N   26   NE  28   NE  24
PORT HARDY   N   19   N   19   NE  24
SANDSPIT     SW  17   SW  11   W   11

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       450 m          5 C
PORT HARDY       130 m          4 C
ANNETTE          150 m          4 C

TODAY'S VENTING: GOOD.

VENTING FOR SUNDAY: FAIR SOUTH. GOOD NORTH.

VENTING OUTLOOK MONDAY THRU WEDNESDAY: FAIR TO GOOD.


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


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