FPCN39 CWLW 031324
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 SUNDAY 3 MAY 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      13   18     550   1     53   28    1450   4
KAMLOOPS     KEL      19   18     700   3     50   27    1550   4
OKANAGAN     KEL      11   16     550   1     54   28    1850   5
CASTLEGAR    SPOK     14   16     750   2     49   26    1250   7
CRANBROOK    SPOK      9   16     950  11     54   24    1600  10
REVELSTOKE   KEL      14   16     600   3     54   27    1850   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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   VR   5   SW  11
CRANBROOK             VR   5   SW  11

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         1200 m         26 C
SPOKANE         2300 m         26 C

TODAY'S VENTING: FAIR.

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.     21   17    1050  12    100   27    3950  13
PR. GEORGE   P.G.     11   14     750   3     74   24    1800   9
SMITHERS     P.G.     12   12     700   2     86   21    1050   4
WELLS GRAY   P.G.      9   15    1000  12    100   27    4000  13
FT NLSN      F.N.     21   14     500  11    100   19     650  11
FT STJOHN    F.N.     10   16     700  18    100   23    3700  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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   24   W   37
SMITHERS              NW  20   NW  37

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      2200 m         20 C
FT. NELSON      NO INVERSION

TODAY'S VENTING: GOOD

VENTING FOR MONDAY: GOOD

VENTING OUTLOOK TUESDAY THRU THURSDAY: FAIR




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     92   17    1000  15     50   21    1500  11
FRASER VLY   QUIL     96   18    1100  15     50   23    1500  11
SRN VRISL    QUIL     87   17     950  14     50   20    1550  11
CNTRL VRISL  QUIL     90   18    1050  14     50   23    1750  11
NRN VRISL    HRDY      9   13     200   0     50   18    1550  11
TERRACE      ANT       9   13     200   0     50   22    1500  11
STEWART      ANT      83   15     900  13     50   22    1500  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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  11   VR   5   VR   5
PORT HARDY   NW  17   N   22   N   20
SANDSPIT     N   48   N   41   N   37

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      3500 m         33 C
PORT HARDY      3500 m         33 C
ANNETTE         2400 m         24 C

TODAY'S VENTING: FAIR

VENTING FOR MONDAY: POOR TO FAIR

VENTING OUTLOOK TUESDAY THRU THURSDAY: POOR




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


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