FPCN39 CWLW 191404
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 TUESDAY 19 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      26   14    1150   2     82   20    3200   4
KAMLOOPS     KEL      58   15    1700   5     82   20    3350   4
OKANAGAN     KEL      22   12    1100   2     82   20    3350   4
CASTLEGAR    SPOK     48   12    1050   8    100   19    3500   7
CRANBROOK    SPOK     54   10    1350  13    100   16    3950   6
REVELSTOKE   KEL      55   14    1700   5     82   18    3450   4

*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   E    9   E   17
CRANBROOK             VR   5   E   17

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         550 m          9 C
SPOKANE         1500 m         14 C

TODAY'S VENTING: GOOD

VENTING FOR WEDNESDAY: GOOD

VENTING OUTLOOK THURSDAY THRU SATURDAY: 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.     50   15    1700   6     96   18    3950   5
PR. GEORGE   P.G.     49   14    1500   6     97   19    3700   5
SMITHERS     P.G.     11   11     700   1     92   20    3500   5
WELLS GRAY   P.G.     96   14    4000   5     96   19    4000   5
FT NLSN      F.N.     25   15     550   9    100   22    3400  10
FT STJOHN    F.N.      9   14     700   9    100   22    3700  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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            NE   9   E   15
SMITHERS              VR   5   S   15

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1500 m         16 C
FT. NELSON      1200 m         21 C

TODAY'S VENTING: GOOD

VENTING FOR WEDNESDAY: GOOD

VENTING OUTLOOK THURSDAY THRU SATURDAY: GOOD




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     57   13     850   8     69   17    1500   6
FRASER VLY   QUIL     54   12     650   9     76   18    1750   6
SRN VRISL    QUIL     42   12     600   7     75   19    2000   5
CNTRL VRISL  QUIL     55   14     850   7     75   19    2000   5
NRN VRISL    HRDY     56   11     650   9     84   15    1350   9
TERRACE      ANT      80   12    1700   8     93   15    2100   8
STEWART      ANT      13   11     200   2     89   15    2000   7

*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   E   13
PORT HARDY   NW  24   N   19   NE  24
SANDSPIT     W   11   S   17   S   26

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      1100 m         15 C
PORT HARDY       700 m         11 C
ANNETTE         1900 m         21 C

TODAY'S VENTING: GOOD SOUTH COAST. POOR NORTH COAST.

VENTING FOR WEDNESDAY: GOOD

VENTING OUTLOOK THURSDAY THRU SATURDAY: GOOD




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


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