Suppression Forecast
Issued by NWS Denver/Boulder, CO

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
000
FNUS75 KBOU 191719
FWSBOU

Spot Forecast for Lefthand Canyon Fire...Boulder Office of Emergency Management
National Weather Service Denver/Boulder CO
1119 AM MDT Mon Oct 19 2020

If conditions become unrepresentative...contact the National Weather
Service.

.DISCUSSION...A lull in the westerly winds late this morning, then
they will pick right back up around noon. Winds will be weaker
than yesterday, with humidity down in the low 20 percent range.
Winds will likely decrease a bit over the evening, with another
mountain wave pattern after midnight. However this one should be
weaker than the one early this morning, with gusts up to 35 mph
possible. Some brief enhancement may be possible with in Spring
Gulch and Lefthand Canyon. Conditions will be similar Tuesday
with even lighter winds.


.REST OF TODAY...

Sky/weather.........Partly cloudy(35-45%) with areas of smoke.
CWR.................0 percent.
LAL.................1.
Max temperature.....Around 57.
Min humidity........21-24%.
Wind (20 ft)........East 5 to 7 mph until 1200, then west winds
                    9-13 mph with gusts up to 25 mph.
Mixing height.......4500 ft AGL.
Transport winds.....West 21-31 mph until 1400, then 31-39 mph.
Smoke dispersal.....Very good.
Haines Index........5 or moderate potential for large plume
                    dominated fire growth.

TIME (MDT)      12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........29  33  38  42  44  45
Weather cov.....ARS ARS ARS ARS DEF DEF
Weather type....SMK SMK SMK SMK SMK SMK
Tstm cov........
CWR.............0   0   0   0   0   0
LAL.............1   1   1   1   1   1
Temp............53  55  56  57  56  54
RH..............31  30  27  25  24  27
20 FT wind dir..W   W   W   W   W   W
20 FT wind spd..7   10  11  12  12  13
20 FT wind gust.16  16  16  19  20  23
Mix hgt (kft)...3.2 4.1 4.7 4.5 4.2 3.7
Transp wind dir.W   W   W   W   W   W
Transp wind spd.42  41  39  39  39  36
Haines index....5   5   5   5   5   5
Vrate kt-ft/1K..107 134 147 140 129 107
SmokeDispersion.VG  VG  VG  VG  VG  VG

.TONIGHT...

Sky/weather.........Partly cloudy(30-40%). Smoke.
CWR.................0 percent.
LAL.................1.
Min temperature.....Around 40.
Max humidity........42%.
Wind (20 ft)........West winds 9-12 mph with gusts up to 16
                    mph until 0100, then 13-17 mph with gusts to
                    around 32 mph.
Mixing height.......1300 ft AGL.
Transport winds.....West 14-24 mph until 2000, then 28-38 mph.
Smoke dispersal.....Good until 1900, then fair until 2100, then
                    poor.
Haines Index........4 or low potential for large plume dominated
                    fire growth.

TIME (MDT)      6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........47  48  45  41  36  30  28  26  25  24  27  30
Weather cov.....DEF DEF DEF DEF DEF DEF DEF DEF DEF DEF DEF DEF
Weather type....SMK SMK SMK SMK SMK SMK SMK SMK SMK SMK SMK SMK
Tstm cov........
CWR.............0   0   0   0   0   0   M   M   M   M   M   M
LAL.............1   1   1   1   1   1   1   1   1   1   1   1
Temp............52  49  47  45  45  45  45  45  43  42  41  40
RH..............28  31  34  36  36  36  36  35  39  39  40  42
20 FT wind dir..W   W   W   W   W   W   W   W   W   W   W   W
20 FT wind spd..9   9   10  10  12  12  12  15  16  17  19  19
20 FT wind gust.16  16  16  18  19  19  20  21  25  27  28  32
Mix hgt (kft)...2.8 2.0 2.0 1.5 1.3 1.3 1.6 1.4 1.3 1.4 1.3 1.1
Transp wind dir.W   W   W   W   W   W   W   W   W   W   W   W
Transp wind spd.29  26  32  32  34  36  36  34  31  39  39  36
Haines index....4   4   4   4   4   4   4   4   4   4   4   4
Vrate kt-ft/1K..64  41  49  39  34  38  46  37  31  45  41  33
SmokeDispersion.G   F   F   P   P   P   F   P   P   F   F   P

.TUESDAY...

Sky/weather.........Partly cloudy(30-35%).
CWR.................0 percent.
LAL.................1.
Max temperature.....Around 58.
Min humidity........25%.
Wind (20 ft)........West winds 10-15 mph until 1200, then 7-10 mph.
                    Gusts up to 25 mph in the morning.
Mixing height.......3000 ft AGL until 1200, then 6800 ft AGL until
                    1700, then 4200 ft AGL.
Transport winds.....West 38-48 mph until 0700. 11-16 mph after
                    1700.
Smoke dispersal.....Fair until 0700, then poor until 0900, then
                    fair until 1000, then good until 1200, then
                    very good until 1400, then excellent until
                    1500, then very good until 1700, then fair.
Haines Index........3 or very low potential for large plume
                    dominated fire growth.

TIME (MDT)      6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........33  32  31  30  30  29  29  30  31  31  36  46
Weather cov.....
Weather type....
Tstm cov........
CWR.............0   0   0   0   0   0   0   0   0   0   0   0
LAL.............1   1   1   1   1   1   1   1   1   1   1   1
Temp............43  44  45  47  49  51  54  56  58  58  56  53
RH..............39  39  39  37  34  32  28  27  25  25  26  28
20 FT wind dir..W   W   W   W   W   W   W   W   W   W   W   W
20 FT wind spd..15  15  15  14  13  12  11  10  10  9   7   6
20 FT wind gust.24  24  24  24  20  20  16  16  16  16  12
Mix hgt (kft)...1.2 1.0 1.3 1.8 2.6 3.6 4.7 5.9 6.9 7.1 6.0 4.2
Transp wind dir.W   W   W   W   W   W   W   W   W   W   W   W
Transp wind spd.48  26  28  31  32  32  32  32  29  27  23  16
Haines index....3   3   3   3   3   3   3   3   3   3   3   3
Vrate kt-ft/1K..43  20  29  43  65  91  116 147 158 149 102 47
SmokeDispersion.F   P   P   F   G   G   VG  VG  E   VG  VG  F

$$
Forecaster...Kriederman
Requested by...Steve Silbermann
Type of request...WILDFIRE
.TAG 2013756.2/BOU
.DELDT 10/19/20
.FormatterVersion 1.0.26
.EMAIL bcsocommunications@bouldercounty.org


USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.