FPCN39 CWLW 301331
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 TUESDAY 30 MARCH 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      24    7     550  20    100   11    2550  20
KAMLOOPS     KEL      92    8    1700  11    100   12    3350  12
OKANAGAN     KEL      15    4     500   4    100   11    3350  12
CASTLEGAR    SPOK     54    4    1000  11    100    8    2300  12
CRANBROOK    SPOK     10    1     950   8    100    5    3950  10
REVELSTOKE   KEL      13    4     550   4     87    7    1650  11

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

FORECAST UPPER WINDS FOR TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   VR   5   VR   5
CRANBROOK             VR   5   W   15

TODAY'S VENTING: GOOD.

VENTING FOR WEDNESDAY: 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    2300  21    100    8    3950  19
PR. GEORGE   P.G.     79    4    1350  17    100    7    2750  19
SMITHERS     P.G.      9    2     500   1     85    6    1650  11
WELLS GRAY   P.G.    100    3    2300  21    100    8    4000  19
FT NLSN      F.N.     37   -7     950   6     46   -4    1150   6
FT STJOHN    F.N.     82   -2    1700  11     95    0    1950  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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            VR   5   SW  17
SMITHERS              VR   5   VR  17

TODAY'S VENTING: FAIR TO GOOD.

VENTING FOR WEDNESDAY: FAIR TO GOOD.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL    100    6    1250  15    100   10    3100  12
FRASER VLY   QUIL     98    6    1150  15    100    9    2600  12
SRN VRISL    QUIL      9    5     600   0    100   10    2850  12
CNTRL VRISL  QUIL    100    7    1400  13    100   10    3050  12
NRN VRISL    HRDY     26    5     200   9    100    8    2500  12
TERRACE      ANT       9    4     200   4     99    6    2200  12
STEWART      ANT       9    4     200   4     99    6    2250  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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   VR   5   VR   5
PORT HARDY   W   13   W    9   VR   5
SANDSPIT     W   19   NW  15   W   13

TODAY'S VENTING: GOOD.

VENTING FOR WEDNESDAY: GOOD.




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


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