FPCN39 CWLW 301400
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 30 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       9   12     550   0     70   21    3200   5

KAMLOOPS     KEL       9   14     950   0     65   22    3350   5

OKANAGAN     KEL       9   12     600   0     70   22    3350   5

CASTLEGAR    SPOK     20   14    1800  13     90   23    3500  12

CRANBROOK    SPOK     ##   ##     ###  ##    100   19    3950  12

REVELSTOKE   KEL       9   13     950   0     70   21    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   VR   5   VR   5
CRANBROOK             VR   5   VR   5

TODAY'S VENTING: BECOMING GOOD THIS AFTERNOON WITH HEATING.




VENTING FOR MONDAY: 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.      9   10     950  15    100   17    3950  12

PR. GEORGE   P.G.     26   10     850  10    100   15    3700  12

SMITHERS     P.G.     13    9     800   2     70   14     950   7

WELLS GRAY   P.G.     ##   ##     ###  ##    100   17    4000  12

FT NLSN      F.N.      9   12     400   4    100   18    3400  12

FT STJOHN    F.N.      9   13     700  12    100   18    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            SW  43   SW  52
SMITHERS              SW  52   W   52

TODAY'S VENTING: GOOD THIS AFTERNOON DUE TO MODERATE HEATING AND
INCREASED WINDS IN BOUNDARY LAYER WITH APPROACHING FRONTAL SYSTEM.




VENTING FOR MONDAY: GOOD.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     21   15     300   6     74   19    1000  10

FRASER VLY   QUIL     20   13     250   6     90   20    1450  10

SRN VRISL    QUIL     16   14     250   3     54   19     750   8

CNTRL VRISL  QUIL     16   15     300   3     80   20    1300   9

NRN VRISL    HRDY     16   10     250   3     35   13     600   4

TERRACE      ANT     100   10    1250  22    100   13    1850  20

STEWART      ANT      ##   ##     ###  ##    100   13    1450  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    NW  19   NW  13   NW  24
PORT HARDY   SW  26   W   52   NW  72
SANDSPIT     W   61   W   80   W   89

TODAY'S VENTING: GOOD THIS AFTERNOON EXCEPT FAIR OVER NORTHERN
VANCOUVER ISLAND SINCE HEATING LESS THAN SOUTH COAST AND
BOUNDARY LAYER WINDS LESS THAN NORTH COAST WHERE FRONT LIES.




VENTING FOR MONDAY: GOOD.




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


END/TCS
$$$$^^