FPCN39 CWLW 261516 AAA
SMOKE CONTROL FORECAST FOR COASTAL BC AND THE INTERIOR INCLUDING THE
NORTHEAST ISSUED BY THE MOUNTAIN WEATHER SERVICE OFFICE OF
ENVIRONMENT CANADA AT 8:10 AM PDT Monday 26 May 1997 FOR TODAY.

VENTING FOR THE PEACE DISTRICT CORRECTED FOR POOR CONDITIONS.


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      48   17    1000   6    100   22    3200   8
KAMLOOPS     KEL     100   20    3350   8    100   24    3350   8
OKANAGAN     KEL      45   16    1100   6    100   21    3350   8
CASTLEGAR    SPOK     23   12     900   4     55   15    1600   7
CRANBROOK    SPOK    100   12    3950   8     55   16    1750   8
REVELSTOKE   KEL      49   16    1350   5     80   22    2850   8


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

FORECAST UPPER WINDS FOR MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   VR   5   W   17
CRANBROOK             VR   5   S    9

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         1200 m         17 C
SPOKANE         none m           C

TODAY'S VENTING: Becoming good by noon in the west but only fair
in the east until late afternoon when it becomes good for only a
couple of hours.

VENTING FOR TUESDAY: Good.

VENTING OUTLOOK WEDNESDAY THRU FRIDAY: Unsettled conditions
keeping the airmass fairly unstable and giving fair to good
venting.

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.     40   15    1350   9     57   22    1950   7
PR. GEORGE   P.G.     57   13    1150  14     54   21    1900   8
SMITHERS     P.G.     53   13    1050  10    100   23    3000   8
WELLS GRAY   P.G.     32   13    1250   9    100   20    2700   7
FT NLSN      F.N.     53    4    1250   4     30    5    1050   4
FT STJOHN    F.N.     52    6    1200   3     30    5    1100   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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            VR   5   VR   5
SMITHERS              S   13   S    5

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE       1500 m         21 C
FT. NELSON      none  m         none C

TODAY'S VENTING: Good above 1500 metres but poor to fair
below it. POOR IN THE PEACE AS THE COOL NORTHEASTERLY FLOW
CONTIUES. Fair to good venting will occur late in the
afternoon for a couple of hours in the Central interior.

VENTING FOR TUESDAY: GOOD
VENTING OUTLOOK WEDNESDAY THRU FRIDAY: Unsettled conditions
keeping the airmass fairly unstable and giving fair to good
venting.



COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     40   16     800   5     66   21    1100   8
FRASER VLY   QUIL     30   15     800   3     66   22    1100   8
SRN VRISL    QUIL     40   16     800   5     50   20    1100   5
CNTRL VRISL  QUIL     40   16     800   5     50   21    1100   5
NRN VRISL    HRDY      9   10     150   3     48   17     650   8
TERRACE      ANT      25   15     900   3     57   23    1200   8
STEWART      ANT      45   13     900   5     73   23    1200  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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   VR   5   VR   5
PORT HARDY   SW  11   S   19   S   24
SANDSPIT     S   20   S   22   S   26

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      1100 m         21 C
PORT HARDY       650 m         22 C
ANNETTE          900 m         18 C

TODAY'S VENTING: FAIR SOUTH TO GOOD NORTH

VENTING FOR TUESDAY: FAIR
VENTING OUTLOOK WEDNESDAY THRU FRIDAY: FAIR


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

END/mwso