FPCN39 CWLW 161358 AAA
REVISED SMOKE CONTROL FORECAST FOR COASTAL BC AND THE INTERIOR
INCLUDING THE NORTHEAST ISSUED BY THE MOUNTAIN WEATHER SERVICE
OFFICE OF ENVIRONMENT CANADA AT 7:10 AM PDT SUNDAY 16 MAY 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      18   14     600   2    100   18    2500  10

KAMLOOPS     KEL      33   14    1600   2    100   18    2600  10

OKANAGAN     KEL      30   14    1600   2    100   18    2600  10

CASTLEGAR    SPOK     30   14    1600   2    100   17    3500  12

CRANBROOK    SPOK     69    9    1450  16    100   15    3950  13

REVELSTOKE   KEL      11   11     550   2    100   17    2600  10



*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   SW  15   SW  26
CRANBROOK             SW  13   SW  31

TODAY'S VENTING: GOOD THIS AFTERNOON.




VENTING FOR MONDAY: 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.     67    9    2450   5     95   15    3950   5

PR. GEORGE   P.G.     30    8    1200   2     79   14    2950   5

SMITHERS     P.G.     21    9    1050   2     69   14    2650   4

WELLS GRAY   P.G.     67    8    2500   5     95   15    4000   5

FT NLSN      F.N.     81    7    1650   9    100   12    3400  12

FT STJOHN    F.N.    100    6    2300  13    100   13    3700  13


*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            VR   5   SE  11
SMITHERS              VR   5   E   11

TODAY'S VENTING: GOOD THIS AFTERNOON.




VENTING FOR MONDAY: FAIR TO GOOD.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     73   12    1500   6    100   16    3100  11

FRASER VLY   QUIL     73   12    1550   6    100   16    3050  11

SRN VRISL    QUIL     71   12    1550   6    100   16    3000  10

CNTRL VRISL  QUIL     71   12    1550   6    100   16    3050  10

NRN VRISL    HRDY     60    9     950   7     88   13    2050   7

TERRACE      ANT      24   12     800   2     92   15    3200   5

STEWART      ANT      24   11     800   2     60   15    1900   3


*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    VR   5   SW  11   S   11
PORT HARDY   VR   5   VR   5   SE  13
SANDSPIT     VR   5   NE  13   E   19

TODAY'S VENTING: GOOD.




VENTING FOR MONDAY: FAIR TO GOOD.




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


END/JDG
$$$$^^