FPCN39 CWLW 291338
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 SUNDAY 29 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      17    5     700   2     96   14    3200   5
KAMLOOPS     KEL      21    5    1000   2     96   14    3350   5
OKANAGAN     KEL      14    3     650   2     96   13    3350   5
CASTLEGAR    SPOK     24    3     750   6    100   10    3500  14
CRANBROOK    SPOK     69    2    1450  17    100   10    3950  15
REVELSTOKE   KEL      14    3     800   2     96   10    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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   W   13   NW  19
CRANBROOK             VR   5   W   20

           INVERSION HT    BREAKTHRU TEMP
KELOWNA          930 m          4 C
SPOKANE         1600 m          8 C

TODAY'S VENTING: POOR THIS MORNING BECOMING GOOD BY NOON.

VENTING FOR MONDAY: FAIR.

VENTING OUTLOOK TUESDAY THRU THURSDAY: 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.     88    1    1600  21    100    8    3950  21
PR. GEORGE   P.G.     89    3    1500  17    100    8    2850  18
SMITHERS     P.G.     33    3     800  10    100    7    1900  15
WELLS GRAY   P.G.      9    2    1050   5    100    8    2850  21
FT NLSN      F.N.      9    4     580   3    100   11    3250  15
FT STJOHN    F.N.      9    3     700   8    100   10    3150  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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  37   W   50
SMITHERS              SW  59   SW  50

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE       830 m          4 C
FT. NELSON       650 m          7 C

TODAY'S VENTING: GOOD.

VENTING FOR MONDAY: GOOD

VENTING OUTLOOK TUESDAY THRU THURSDAY: GOOD BECOMING FAIR WEDNESDAY.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     17    6     250   5     75   11    1600   6
FRASER VLY   QUIL     19    7     250   5    100   15    2900   8
SRN VRISL    QUIL     15    7     250   3     79   12    1850   6
CNTRL VRISL  QUIL     15    8     250   3    100   14    2500   7
NRN VRISL    HRDY     42    7     700   5     61   10    1150   6
TERRACE      ANT      79    4     650  24    100    6    1100  24
STEWART      ANT      56    5     300  20     89    6     650  21

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

FORECAST UPPER WINDS FOR SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W   11   NW  17   NW  31
PORT HARDY   S   43   SW  43   W   50
SANDSPIT     SW  78   SW  80   SW  82

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       450 m         11 C
PORT HARDY       950 m          8 C
ANNETTE          500 m          5 C

TODAY'S VENTING: GOOD.

VENTING FOR MONDAY: GOOD

VENTING OUTLOOK TUESDAY THRU THURSDAY: FAIR.




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


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