NBM Guidance for GRASSY MOUNTAIN (GSFO3)
42.6261N 117.3951W
Elevation 4747 ft
HOURLY TO 24 HOURS:
GSFO3 NBM V5.0 NBH GUIDANCE 8/27/2026 1500 UTC
UTC 16 17 18 19 20 21 22 23 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 Time (UTC)
PDT 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 00 01 02 03 04 05 06 07 08 09 Time (PDT)
TMP 80 83 85 88 90 91 91 91 91 90 87 80 77 75 74 72 71 70 69 69 68 66 66 70 72 Temperature(F)
TSD 2 2 1 1 1 2 1 1 1 1 2 2 2 2 2 2 2 2 3 3 3 3 4 4 4 SD of temp(F)
DPT 31 29 28 28 28 29 29 29 29 28 28 28 29 28 28 28 28 28 28 30 32 34 37 39 41 Dew point temp(F)
DSD 3 4 5 5 4 4 4 4 4 4 5 6 6 6 6 5 6 6 7 7 7 7 8 8 6 Dew point temp SD(F)
WBG 64 66 69 70 71 72 72 70 69 69 66 63 61 59 59 58 56 56 55 56 56 54 56 59 61 Wet bulb temp(F)
SKY 42 51 35 32 29 23 17 47 60 62 83 82 85 94 91 94100 99 97 94 91 97 90 85 56 Sky cover(%)
SSD 30 30 35 31 29 30 29 27 28 30 18 17 13 17 9 16 2 5 6 8 15 7 17 19 30 Sky cover SD(%)
WDR 23 24 24 24 25 24 23 24 24 25 25 25 26 22 21 22 22 22 21 20 19 17 18 17 20 Wind dir (deg)
WSP 11 12 12 12 12 13 14 15 14 12 10 7 7 6 5 5 6 9 10 10 9 9 8 7 9 Wind spd (kts)
WSD 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 4 4 4 4 5 5 5 5 5 4 Wind spd SD(kts)
GST 20 21 22 22 24 24 25 26 25 22 17 13 12 11 10 10 11 14 16 16 15 15 13 13 16 Wind gust(kts)
GSD 4 4 4 4 4 4 4 4 4 4 4 5 4 5 5 6 6 6 6 6 7 6 6 6 6 Wind gust SD(kts)
P01 0 0 0 0 0 0 0 1 1 1 2 2 1 1 1 1 1 1 4 2 5 4 9 7 5 1-hr PoP(%)
P06 1 2 5 6-hr PoP(%)
Q01 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1-hr QPF (.01")
T01 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1-hr tstm prob(%)
PZR 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Cond prob ZR(%)
PSN 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Cond prob Snow(%)
PPL 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Cond prob Sleet/IP(%)
PRA 0 0 0 0 0 0 0 0 0 1 1 0 0 0 0 1 1 1 5 29 29 29 6 11 13 Cond prob of rain(%)
S01 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1-hr snow(1/10in)
SLV 123124126126125126127128129129129127126125125125126127126127128127126126125 Snow level 100s feet MSL
I01 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1-hr ice(1/100in)
CIG -88-88-88-88-88-88-88-88140160160150150130180170160140130130150150130130-88 Ceiling height*
MVC 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 1 1 Prob cig<=3000ft(%) MVFR
IFC 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Prob cig<1000ft(%) IFR
LIC 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Prob cig<500ft(%) LIFR
LCB 110110120120 90 80 60140120130130130130100140130130110100100110110 90 90 90 Lowest cloud base*
VIS 100100100100100100100100100100100100100100100100100100100100100100100100100 Visibility*
MVV 1 1 1 1 1 2 1 1 1 1 1 0 0 0 0 0 0 0 1 1 1 2 3 3 4 Prob vsby<=5mi(%) MVFR
IFV 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 Prob vsby<3mi(%) IFR
LIV 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Prob vsby<1mi(%) LIFR
MHT 24 46 64 84107125132139137127 20 5 5 5 5 5 5 5 5 5 9 15 9 10 19 MixHgt 100s feet AGL
TWD 24 25 24 24 23 23 23 23 24 24 25 25 27 27 26 26 26 25 24 25 22 22 20 18 21 Transport wind dir
TWS 12 15 17 19 22 22 22 21 20 17 12 9 9 8 10 10 10 12 12 12 10 11 11 11 12 Transport wind spd(kts)
SOL 36 50 64 82 82 82 76 53 42 12 4 1 0 0 0 0 0 0 0 0 0 0 3 14 27 Solar rad (10s W/m2)
3-HOURLY TO 60 HOURS:
GSFO3 NBM V5.0 NBS GUIDANCE 8/27/2026 1500 UTC
DT /AUG 28 /AUG 29 /AUG 30
UTC 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 Time (UTC)
PDT 14 17 20 23 02 05 08 11 14 17 20 23 02 05 08 11 14 17 20 23 02 05 08 Time (PDT)
FHR 06 09 12 15 18 21 24 27 30 33 36 39 42 45 48 51 54 57 60 63 66 69 72 Forecast Hour
TXN 66 80 57 81 50 Max/Min Temp(F)
XND 5 5 6 3 5 SD of max/min temps(F)
TMP 91 91 80 74 70 68 70 74 77 77 69 66 63 59 64 73 79 80 69 63 56 50 55 Temperature(F)
TSD 2 1 2 2 2 3 4 5 6 6 5 4 4 5 3 2 2 3 4 3 3 3 3 SD of temp(F)
DPT 29 29 28 28 28 32 39 44 43 44 46 48 47 46 48 43 36 32 34 34 32 32 32 Dew point temp(F)
DSD 4 4 6 6 6 7 8 7 6 6 7 7 8 7 6 5 7 8 7 8 7 5 5 Dew point temp SD(F)
WBG 72 69 63 59 56 56 59 64 66 64 59 58 56 54 58 64 66 64 57 53 48 44 48 Wet bulb temp(F)
SKY 23 60 82 91 99 91 85 72 57 68 97 88 89 34 2 3 18 43 55 34 34 17 6 Sky cover(%)
SSD 30 28 17 9 5 15 19 22 27 32 6 11 21 29 2 4 18 16 31 27 29 15 6 Sky cover SD(%)
WDR 24 24 25 21 22 19 17 19 21 21 20 19 20 19 19 24 25 24 32 34 33 33 36 Wind dir (deg)
WSP 13 14 7 5 9 9 7 12 13 14 14 18 15 10 7 8 12 13 13 9 8 4 3 Wind spd (kts)
WSD 3 3 3 3 4 5 5 4 4 4 4 4 4 4 3 3 3 3 4 5 3 3 3 Wind spd SD(kts)
GST 24 25 13 10 14 15 13 21 23 24 24 26 22 15 13 18 24 25 22 16 13 8 8 Wind gust(kts)
GSD 4 4 5 5 6 7 6 4 5 5 6 6 5 5 4 4 4 4 5 6 5 4 4 Wind gust SD(kts)
P06 1 2 5 20 28 28 5 5 4 11 2 6-hr PoP(%)
P12 4 34 32 8 7 12-hr PoP(%)
Q06 0 0 0 0 2 1 0 0 0 0 0 6-hr QPF(.01in)
Q12 0 2 1 0 0 12-hr QPF(.01in)
DUR 0 2 0 0 0 Duration of precip(hrs)
T03 0 2 2 0 0 1 1 1 4 11 10 3 1 0 2 1 3 6 5 2 0 0 0 3-hr Tstm prob(%)
T06 2 2 1 2 13 15 1 2 8 5 0 6-hr Tstm prob(%)
T12 3 13 15 8 5 12-hr Tstm prob(%)
PZR 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Cond prob ZR(%)
PSN 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Cond prob Snow(%)
PPL 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Cond prob Sleet/IP(%)
PRA 0 0 0 0 1 29 11 22 6 3 12 11 10 10 1 1 7 7 10 9 1 1 1 Cond prob of rain(%)
S06 0 0 0 0 0 0 0 0 0 0 0 6-hr snow(1/10in)
SLV 130130130120130130130120130130130120120110110110120110110110100 98 94 Snow level 100s feet MSL
I06 0 0 0 0 0 0 0 0 0 0 0 6-hr ice(1/100in)
CIG -88140150180140150130110130 90 80130130-88-88-88-88-88-88-88-88-88-88 Ceiling height*
IFC 0 0 0 0 0 0 0 0 0 0 0 1 1 1 2 0 0 0 0 1 1 1 2 Prob cig<1000ft(%) IFR
LCB 80120130140110110 90 90 90 80 80 48 50 46 70 46 70 80130 90 90200230 Lowest cloud base*
VIS 100100100100100100100100100100100100100100100100100100100100100100100 Visibility*
IFV 0 0 0 0 0 0 1 1 1 1 1 1 0 1 0 0 0 0 0 0 0 1 0 Prob vsby<3mi(%) IFR
MHT 125137 5 5 5 9 10 41 82 62 10 14 10 5 12 66106109 28 5 5 5 11 MixHgt 100s feet AGL
TWD 23 24 25 26 25 22 18 20 22 21 20 19 22 21 21 24 24 25 33 34 34 34 33 Transport wind dir
TWS 22 20 9 10 12 10 11 14 15 18 16 18 15 10 9 13 18 21 17 12 9 6 4 Transport wind spd(kts)
SOL 82 42 1 0 0 0 14 44 52 25 1 0 0 0 18 54 78 49 8 4 0 0 7 Solar rad (10s W/m2)
DAILY TO 7 DAYS:
GSFO3 NBM V5.0 NBE GUIDANCE 8/27/2026 1500 UTC
FRI 28 |SAT 29 |SUN 30 |MON 31 |TUE 01 |WED 02 |THU 03 |FRI 04 CLIMO
UTC 12| 00 12| 00 12| 00 12| 00 12| 00 12| 00 12| 00 12 Time (UTC)
PDT 05 17 05 17 05 17 05 17 05 17 05 17 05 17 05 Time (PDT)
FHR 21| 33 45| 57 69| 81 93|105 117|129 141|153 165|177 189 Forecast Hour
TXN 66| 80 57| 81 50| 77 53| 85 56| 82 53| 78 52| 77 49 49 83 Max/Min Temp(F)
XND 5| 5 6| 3 5| 5 5| 3 5| 3 4| 5 5| 7 7 SD of max/min temps(F)
TMP 68| 77 59| 80 50| 77 53| 84 56| 81 53| 78 52| 76 51 Temperature(F)
TSD 3| 6 5| 3 3| 5 4| 3 3| 3 4| 6 4| 8 6 SD of temp(F)
DPT 32| 44 46| 32 32| 24 27| 22 27| 19 26| 23 30| 29 34 Dew point temp(F)
DSD 7| 6 7| 8 5| 6 6| 5 6| 6 8| 7 8| 10 8 Dew point temp SD(F)
WBG 56| 64 54| 64 44| 61 44| 65 46| 62 45| 61 46| 61 45 Wet bulb temp(F)
SKY 91| 68 34| 43 17| 2 17| 18 39| 30 36| 36 36| 31 29 Sky cover(%)
SSD 15| 32 29| 16 15| 3 12| 11 21| 24 22| 9 22| 26 20 Sky cover SD(%)
WDR 19| 21 19| 24 33| 32 14| 23 22| 23 17| 24 20| 27 21 Wind dir (deg)
WSP 9| 14 10| 13 4| 6 9| 10 5| 17 6| 14 5| 15 5 Wind spd (kts)
WSD 5| 4 4| 3 3| 3 3| 5 3| 4 4| 4 4| 5 3 Wind spd SD(kts)
GST 15| 24 15| 25 8| 15 14| 21 10| 27 11| 26 10| 27 9 Wind gust(kts)
GSD 7| 5 5| 4 4| 4 3| 5 4| 5 6| 5 5| 6 5 Wind gust SD(kts)
P12 4| 34 32| 8 7| 1 0| 1 0| 1 8| 8 8| 12 14 -99-99 12-hr PoP(%)
Q12 0| 2 1| 0 0| 0 0| 0 0| 0 0| 1 0| 0 0 12-hr QPF(.01in)
Q24 | 3| 0| 0| 0| 0| 1| 0 9 24-hr QPF(.01in)
DUR 0| 2 0| 0 0| 0 0| 0 0| 0 0| 1 0| 0 0 Duration of precip(hrs)
T12 3| 13 15| 8 5| 1 2| 4 4| 5 5| 7 5| 6 6 12-hr Tstm prob(%)
PZR 0| 0 0| 0 0| 0 0| 0 0| 0 0| 0 0| 0 0 Cond prob ZR(%)
PSN 0| 0 0| 0 0| 0 0| 0 0| 0 0| 0 0| 0 0 Cond prob Snow(%)
PPL 0| 0 0| 0 0| 0 0| 0 0| 0 0| 0 0| 0 0 Cond prob Sleet/IP(%)
PRA 29| 3 10| 7 1| 1 2| 1 0| 1 4| 3 8| 12 13 Cond prob of rain(%)
S12 0| 0 0| 0 0| 0 0| 0 0| 0 0| 0 0| 0 0 12-hr snow(1/10in)
S24 | 0| 0| 0| 0| 0| 0| 0 24-hr snow(1/10in)
SLV 128|128 115|115 98|101 104|112 105|103 94|100 95|105 100 Snow level 100s feet MSL
I12 0| 0 0| 0 0| 0 0| 0 0| 0 0| 0 0| 0 0 12-hr ice(1/100in)
SOL 2| 31 0| 50 3| 51 6| 49 5| 49 5| 44 4| 48 5 Solar rad (10s W/m2)
DAY 8, 9 AND 10:
GSFO3 NBM V5.0 NBX GUIDANCE 8/27/2026 1500 UTC
SAT 05| SUN 06| MON 07
UTC 00 12 |00 12 |00 12 Time (UTC)
PDT 17 05 |17 05 |17 05 Time (PDT)
FHR 201 213|225 237|249 261 Forecast Hour
TXN 75 48| 76 50| 78 52 Max/Min Temp(F)
XND 10 8| 10 8| 9 8 SD of max/min temps(F)
TMP 74 50| 76 50| 77 52 Temperature(F)
TSD 10 8| 9 7| 9 7 SD of temp(F)
DPT 30 33| 28 31| 28 32 Dew point temp(F)
DSD 10 8| 10 10| 11 10 Dew point temp SD(F)
WBG 60 44| 61 45| 61 45 Wet bulb temp(F)
SKY 23 25| 26 29| 23 31 Sky cover(%)
SSD 14 17| 12 15| 5 12 Sky cover SD(%)
WDR 29 2| 30 14| 32 9 Wind dir (deg)
WSP 11 4| 9 5| 7 5 Wind spd (kts)
WSD 5 4| 4 3| 4 3 Wind spd SD(kts)
GST 23 9| 20 9| 18 9 Wind gust(kts)
GSD 6 5| 5 4| 5 4 Wind gust SD(kts)
P12 18 7| 8 15| 12 13 12-hr PoP(%)
Q12 3 0| 0 6| 0 0 12-hr QPF(.01in)
Q24 3| 6| 0 24-hr QPF(.01in)
DUR 1 0| 0 2| 0 0 Duration of precip(hrs)
PZR 0 0| 0 0| 0 0 Cond prob ZR(%)
PSN 0 0| 0 0| 0 0 Cond prob Snow(%)
PPL 0 0| 0 0| 0 0 Cond prob Sleet/IP(%)
PRA 12 6| 6 12| 14 9 Cond prob of rain(%)
S12 0 0| 0 0| 0 0 12-hr snow(1/10in)
S24 0| 0| 0 24-hr snow(1/10in)
SLV 103 95|100 93|102 100 Snow level 100s feet MSL
I12 0 0| 0 0| 0 0 12-hr ice(1/100in)
SOL 21 18| 31 15| 31 19 Solar rad (10s W/m2)
STANDARD DEVIATION AND THRESHOLD PROBABILITIES:
GSFO3 NBM V5.0 NBP GUIDANCE 8/27/2026 1300 UTC
FRI 28| SAT 29| SUN 30| MON 31| TUE 01| WED 02| THU 03| FRI 04| SAT 05|
UTC 12| 00 12| 00 12| 00 12| 00 12| 00 12| 00 12| 00 12| 00 12| 00 Time (UTC)
PDT 05| 17 05| 17 05| 17 05| 17 05| 17 05| 17 05| 17 05| 17 05| 17 Time (PDT)
FHR 23| 35 47| 59 71| 83 95|107 119|131 143|155 167|179 191|203 215|227 Forecast Hour
TXNMN 67| 80 59| 81 53| 77 53| 85 58| 82 53| 78 52| 77 49| 75 48| 75 Mean min/max temp(F)
TXNSD 4| 5 6| 3 5| 5 5| 3 5| 3 4| 5 5| 7 7| 10 8| 10 SD min/max temp(F)
TXNP1 61| 75 51| 78 47| 70 46| 82 52| 77 48| 71 44| 67 41| 63 38| 63 10th percentile min/max temp(F)
TXNP2 63| 77 53| 79 50| 73 49| 84 54| 80 51| 74 49| 72 44| 67 42| 67 25th percentile min/max temp(F)
TXNP5 67| 79 59| 82 53| 76 52| 86 57| 82 53| 78 52| 77 50| 73 47| 73 50th percentile min/max temp(F)
TXNP7 70| 84 64| 83 57| 81 57| 87 63| 84 56| 82 55| 83 53| 82 54| 82 75th percentile min/max temp(F)
TXNP9 73| 88 66| 85 59| 83 59| 88 64| 85 59| 84 58| 85 58| 87 58| 87 90th percentile min/max temp(F)
WSPP1 3| 7 3| 8 2| 4 5| 4 2| 7 2| 6 2| 6 2| 4 2| 5 10th percentile wnd(kts)
WSPP2 5| 10 6| 11 3| 5 6| 6 4| 11 4| 10 3| 9 3| 6 3| 6 25th percentile wnd(kts)
WSPP5 8| 13 9| 13 4| 6 8| 10 5| 15 6| 13 5| 13 5| 10 4| 9 50th percentile wnd(kts)
WSPP7 11| 16 11| 15 6| 8 10| 14 8| 17 9| 16 8| 17 7| 13 7| 12 75th percentile wnd(kts)
WSPP9 15| 18 13| 17 9| 10 12| 16 10| 18 12| 18 12| 19 11| 17 10| 15 90th percentile wnd(kts)
W24P1 | 15 | 15 | 15 | 11 | 11 | 14 | 12 | 12 | 11 10th percentile 24hr sustained wnd exceedance(kts)
W24P2 | 16 | 18 | 17 | 12 | 14 | 17 | 16 | 15 | 12 25th percentile 24hr sustained wnd exceedance(kts)
W24P5 | 18 | 20 | 19 | 13 | 16 | 20 | 19 | 18 | 16 50th percentile 24hr sustained wnd exceedance(kts)
W24P7 | 20 | 22 | 20 | 15 | 18 | 22 | 21 | 22 | 19 75th percentile 24hr sustained wnd exceedance(kts)
W24P9 | 21 | 25 | 22 | 17 | 20 | 24 | 23 | 24 | 21 90th percentile 24hr sustained wnd exceedance(kts)
G24P1 | 24 | 25 | 26 | 18 | 20 | 23 | 20 | 20 | 19 10th percentile 24hr wnd gust exceedance(kts)
G24P2 | 27 | 30 | 28 | 20 | 24 | 27 | 27 | 25 | 22 25th percentile 24hr wnd gust exceedance(kts)
G24P5 | 30 | 32 | 31 | 23 | 27 | 32 | 31 | 31 | 27 50th percentile 24hr wnd gust exceedance(kts)
G24P7 | 33 | 36 | 34 | 26 | 31 | 36 | 35 | 35 | 32 75th percentile 24hr wnd gust exceedance(kts)
G24P9 | 36 | 38 | 37 | 30 | 33 | 38 | 38 | 38 | 36 90th percentile 24hr wnd gust exceedance(kts)
Q24P1 | 0| 0| 0| 0| 0| 0| 0| 0| 10th percentile 24hr QPF(1/100in)
Q24P2 | 0| 0| 0| 0| 0| 0| 0| 0| 25th percentile 24hr QPF(1/100in)
Q24P5 | 0| 0| 0| 0| 0| 0| 0| 0| 50th percentile 24hr QPF(1/100in)
Q24P7 | 13| 0| 0| 0| 0| 0| 0| 0| 75th percentile 24hr QPF(1/100in)
Q24P9 | 21| 2| 0| 0| 0| 1| 14| 15| 90th percentile 24hr QPF(1/100in)
S24P1 | 0| 0| 0| 0| 0| 0| 0| 0| 10th percentile 24hr snow accum(1/10in)
S24P2 | 0| 0| 0| 0| 0| 0| 0| 0| 25th percentile 24hr snow accum(1/10in)
S24P5 | 0| 0| 0| 0| 0| 0| 0| 0| 50th percentile 24hr snow accum(1/10in)
S24P7 | 0| 0| 0| 0| 0| 0| 0| 0| 75th percentile 24hr snow accum(1/10in)
S24P9 | 0| 0| 0| 0| 0| 0| 0| 0| 90th percentile 24hr snow accum(1/10in)
I24P1 | 0| 0| 0| 0| 0| 0| 0| 0| 10th percentile 24hr ice accum(1/100in)
I24P2 | 0| 0| 0| 0| 0| 0| 0| 0| 25th percentile 24hr ice accum(1/100in)
I24P5 | 0| 0| 0| 0| 0| 0| 0| 0| 50th percentile 24hr ice accum(1/100in)
I24P7 | 0| 0| 0| 0| 0| 0| 0| 0| 75th percentile 24hr ice accum(1/100in)
I24P9 | 0| 0| 0| 0| 0| 0| 0| 0| 90th percentile 24hr ice accum(1/100in)
SLPP1 012|009 011|007 012|008 009|003 008|006 011|009 012|007 009|006 011|008 10th percentile MSLP(mb)
SLPP2 012|011 012|007 014|009 010|005 010|007 013|010 014|009 012|010 014|010 25th percentile MSLP(mb)
SLPP5 013|012 013|008 015|011 012|006 011|009 014|012 015|012 015|012 016|012 50th percentile MSLP(mb)
SLPP7 013|014 014|010 016|014 016|008 013|010 016|014 018|014 018|015 018|015 75th percentile MSLP(mb)
SLPP9 014|014 014|011 017|014 018|010 014|012 017|016 020|017 020|017 020|017 90th percentile MSLP(mb)