NBM Guidance for PORTLAND (KPDX)
45.5958N 122.6092W
Elevation 26 ft
HOURLY TO 24 HOURS:
KPDX NBM V5.0 NBH GUIDANCE 8/28/2026 1600 UTC
UTC 17 18 19 20 21 22 23 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 Time (UTC)
PDT 10 11 12 13 14 15 16 17 18 19 20 21 22 23 00 01 02 03 04 05 06 07 08 09 10 Time (PDT)
TMP 64 67 70 72 74 76 77 76 75 73 69 66 63 62 61 59 58 58 57 57 57 57 58 59 61 Temperature(F)
TSD 1 1 1 1 1 2 2 2 2 2 1 1 1 1 1 1 2 1 1 1 2 2 2 2 2 SD of temp(F)
DPT 54 54 54 53 53 52 52 51 50 50 51 51 51 51 51 51 52 52 52 52 52 52 52 52 52 Dew point temp(F)
DSD 1 1 1 1 1 1 1 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 1 1 Dew point temp SD(F)
WBG 61 64 67 69 70 70 69 68 66 65 62 60 59 57 57 56 55 55 55 55 55 55 56 56 57 Wet bulb temp(F)
SKY 31 24 26 19 15 9 9 10 14 13 17 18 34 39 32 17 31 63 71 62 79 89 80 74 65 Sky cover(%)
SSD 25 18 17 18 13 11 9 8 16 13 13 26 33 32 33 18 30 33 23 27 21 16 33 37 29 Sky cover SD(%)
WDR 32 31 31 31 31 31 31 32 33 33 32 32 33 32 31 30 28 25 21 18 19 20 21 22 23 Wind dir (deg)
WSP 5 6 6 7 8 8 8 8 9 9 9 8 8 7 6 5 5 3 3 4 4 5 5 6 6 Wind spd (kts)
WSD 2 2 1 2 2 2 2 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 2 2 Wind spd SD(kts)
GST 6 7 8 9 10 10 11 12 14 16 15 14 13 11 9 8 6 5 4 5 6 6 6 7 7 Wind gust(kts)
GSD 2 2 2 2 3 2 2 2 2 2 2 2 2 3 3 3 3 3 3 2 2 2 2 2 2 Wind gust SD(kts)
P01 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 0 5 8 7 7 2 1-hr PoP(%)
P06 0 0 1 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 1 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 1 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 0 0 0 0 0 0 0 0 1 8 8 5 22 25 9 9 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 83 83 83 83 83 83 83 84 83 82 81 80 79 77 72 66 66 69 69 70 68 68 66 64 63 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 -88-88-88-88-88-88-88-88-88-88-88-88-88-88-88-88-88 60 45 45 45 35 35 35 35 Ceiling height*
MVC 5 2 1 0 0 0 0 0 0 0 0 0 1 3 6 10 11 13 17 20 19 18 19 22 25 Prob cig<=3000ft(%) MVFR
IFC 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 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 1 0 0 0 0 0 0 0 0 0 0 Prob cig<500ft(%) LIFR
LCB 100100 60 50 60 90 50 60 60 46 49 44 60 50140230 60 30 31 37 25 30 35 24 28 Lowest cloud base*
VIS 100100100100100100100100100100100100100100100100100100100100100100100100100 Visibility*
MVV 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 2 3 2 1 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 0 0 0 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 25 33 39 45 48 52 56 55 46 30 11 6 8 9 5 5 5 5 6 8 8 10 15 23 31 MixHgt 100s feet AGL
TWD 33 32 32 31 31 31 31 31 33 34 33 33 34 34 33 31 29 26 25 23 20 20 23 25 26 Transport wind dir
TWS 5 6 6 7 8 8 8 9 9 11 12 11 10 8 7 6 5 4 4 4 6 7 6 6 6 Transport wind spd(kts)
SOL 41 51 71 76 77 74 64 49 26 10 2 1 1 0 0 0 0 0 0 0 0 2 10 19 23 Solar rad (10s W/m2)
3-HOURLY TO 60 HOURS:
KPDX NBM V5.0 NBS GUIDANCE 8/28/2026 1600 UTC
DT /AUG 29 /AUG 30 /AUG 31
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 05 08 11 14 17 20 23 26 29 32 35 38 41 44 47 50 53 56 59 62 65 68 71 Forecast Hour
TXN 57 73 54 74 56 Max/Min Temp(F)
XND 2 3 3 3 3 SD of max/min temps(F)
TMP 74 76 69 62 58 57 58 63 69 71 66 59 56 54 56 63 69 73 68 62 58 56 57 Temperature(F)
TSD 1 2 1 1 2 1 2 2 2 2 1 2 2 2 2 2 2 2 2 2 2 2 2 SD of temp(F)
DPT 53 51 51 51 52 52 52 52 50 49 50 52 52 52 52 51 50 49 51 53 53 52 52 Dew point temp(F)
DSD 1 2 2 1 1 1 1 2 2 3 2 1 1 1 1 1 2 3 2 2 2 2 2 Dew point temp SD(F)
WBG 70 68 62 57 55 55 56 60 65 64 59 56 54 53 55 60 65 66 62 58 56 54 55 Wet bulb temp(F)
SKY 15 10 17 39 31 62 80 59 34 50 9 7 44 78 81 59 32 13 24 22 19 25 36 Sky cover(%)
SSD 13 8 13 32 30 27 33 25 29 26 6 10 35 37 24 24 16 10 18 20 12 17 27 Sky cover SD(%)
WDR 31 32 32 32 28 18 21 24 27 31 32 32 29 21 24 30 33 34 34 33 35 36 36 Wind dir (deg)
WSP 8 8 9 7 5 4 5 6 6 8 7 4 0 0 0 4 7 8 6 5 6 4 3 Wind spd (kts)
WSD 2 1 1 2 2 2 2 2 3 2 2 2 2 2 2 2 3 2 2 2 2 2 2 Wind spd SD(kts)
GST 10 12 15 11 6 5 6 7 9 13 12 7 3 2 3 6 9 12 9 7 7 5 4 Wind gust(kts)
GSD 3 2 2 3 3 2 2 2 3 3 3 3 3 2 1 2 3 3 3 3 2 2 2 Wind gust SD(kts)
P06 0 0 1 15 19 0 0 0 0 0 0 6-hr PoP(%)
P12 0 27 1 0 0 12-hr PoP(%)
Q06 0 0 0 0 0 0 0 0 0 0 0 6-hr QPF(.01in)
Q12 0 0 0 0 0 12-hr QPF(.01in)
DUR 0 4 0 0 0 Duration of precip(hrs)
T03 0 0 0 0 0 0 1 1 2 1 0 0 0 0 0 0 0 0 0 0 0 0 0 3-hr Tstm prob(%)
T06 0 0 1 4 6 0 0 0 0 0 0 6-hr Tstm prob(%)
T12 1 6 0 0 0 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 0 8 25 9 31 21 0 0 0 0 0 0 0 0 0 0 0 0 0 Cond prob of rain(%)
S06 0 0 0 0 0 0 0 0 0 0 0 6-hr snow(1/10in)
SLV 83 84 81 77 66 70 66 62 67 69 67 65 65 65 76 81 93 96 96 97 99 99 99 Snow level 100s feet MSL
I06 0 0 0 0 0 0 0 0 0 0 0 6-hr ice(1/100in)
CIG -88-88-88-88-88 45 35 35-88-88-88-88-88 40 42-88-88-88-88-88-88-88-88 Ceiling height*
IFC 0 0 0 1 0 0 0 0 0 0 0 0 1 4 13 1 0 0 0 0 2 9 16 Prob cig<1000ft(%) IFR
LCB 60 60 49 50 60 37 35 34 60 50120100 17 14 27 29 70 70110130140140120 Lowest cloud base*
VIS 100100100100100100100100100100100100100100100100100100100100100100100 Visibility*
IFV 0 0 0 0 0 0 0 0 0 0 0 1 2 2 3 0 0 0 0 0 1 2 4 Prob vsby<3mi(%) IFR
MHT 48 55 11 9 5 8 15 42 53 55 17 6 7 7 13 38 41 41 16 6 6 5 7 MixHgt 100s feet AGL
TWD 31 31 33 34 29 23 23 27 28 29 30 33 32 32 24 31 32 34 34 34 35 36 36 Transport wind dir
TWS 8 9 12 8 5 4 6 8 8 10 10 6 4 3 3 5 7 9 7 6 6 4 4 Transport wind spd(kts)
SOL 77 49 2 0 0 0 10 35 57 37 3 1 0 0 2 36 74 57 19 9 0 0 3 Solar rad (10s W/m2)
DAILY TO 7 DAYS:
KPDX NBM V5.0 NBE GUIDANCE 8/28/2026 1600 UTC
SAT 29 |SUN 30 |MON 31 |TUE 01 |WED 02 |THU 03 |FRI 04 |SAT 05 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 20| 32 44| 56 68| 80 92|104 116|128 140|152 164|176 188 Forecast Hour
TXN 57| 73 54| 74 56| 82 59| 77 58| 67 56| 69 55| 72 56 54 78 Max/Min Temp(F)
XND 2| 3 3| 3 3| 3 2| 4 2| 6 3| 5 4| 6 3 SD of max/min temps(F)
TMP 57| 71 54| 73 56| 81 59| 74 59| 65 58| 68 56| 71 56 Temperature(F)
TSD 1| 2 2| 2 2| 4 2| 5 2| 6 3| 5 3| 6 3 SD of temp(F)
DPT 52| 49 52| 49 52| 51 54| 53 54| 56 55| 54 53| 54 53 Dew point temp(F)
DSD 1| 3 1| 3 2| 3 1| 3 2| 4 2| 4 2| 4 3 Dew point temp SD(F)
WBG 55| 64 53| 66 54| 70 57| 67 57| 62 57| 64 54| 66 54 Wet bulb temp(F)
SKY 62| 50 78| 13 25| 34 68| 41 79| 84 78| 57 59| 26 46 Sky cover(%)
SSD 27| 26 37| 10 17| 28 25| 23 27| 11 20| 17 28| 16 22 Sky cover SD(%)
WDR 18| 31 21| 34 36| 32 30| 25 18| 19 18| 28 18| 33 32 Wind dir (deg)
WSP 4| 8 0| 8 4| 6 0| 8 10| 9 8| 6 3| 5 3 Wind spd (kts)
WSD 2| 2 2| 2 2| 3 2| 2 3| 3 3| 3 3| 3 3 Wind spd SD(kts)
GST 5| 13 2| 12 5| 8 3| 11 20| 16 14| 9 4| 7 4 Wind gust(kts)
GSD 2| 3 2| 3 2| 4 3| 4 7| 7 7| 6 5| 4 4 Wind gust SD(kts)
P12 0| 27 1| 0 0| 0 4| 19 33| 72 88| 63 44| 32 19 11 16 12-hr PoP(%)
Q12 0| 0 0| 0 0| 0 0| 0 2| 46 39| 20 9| 8 0 12-hr QPF(.01in)
Q24 | 0| 0| 0| 2| 85| 29| 8 26 24-hr QPF(.01in)
DUR 0| 4 0| 0 0| 0 0| 0 1| 7 6| 4 3| 3 0 Duration of precip(hrs)
T12 1| 6 0| 0 0| 1 1| 6 7| 8 11| 12 8| 11 5 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 8| 21 0| 0 0| 2 10| 18 54| 80 74| 63 19| 21 14 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 70| 69 65| 96 99| 97 94| 88 81| 80 68| 71 69| 76 76 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 3| 32 0| 42 7| 40 5| 44 6| 2 1| 34 4| 37 6 Solar rad (10s W/m2)
DAY 8, 9 AND 10:
KPDX NBM V5.0 NBX GUIDANCE 8/28/2026 1600 UTC
SUN 06| MON 07| TUE 08
UTC 00 12 |00 12 |00 12 Time (UTC)
PDT 17 05 |17 05 |17 05 Time (PDT)
FHR 200 212|224 236|248 260 Forecast Hour
TXN 76 58| 79 59| 81 59 Max/Min Temp(F)
XND 7 3| 8 3| 8 4 SD of max/min temps(F)
TMP 75 58| 79 59| 80 59 Temperature(F)
TSD 7 3| 8 3| 8 3 SD of temp(F)
DPT 53 53| 54 54| 54 54 Dew point temp(F)
DSD 5 4| 6 3| 5 4 Dew point temp SD(F)
WBG 67 55| 70 57| 71 57 Wet bulb temp(F)
SKY 37 36| 27 44| 24 59 Sky cover(%)
SSD 31 31| 27 8| 8 21 Sky cover SD(%)
WDR 35 3| 34 6| 32 3 Wind dir (deg)
WSP 6 4| 7 3| 5 3 Wind spd (kts)
WSD 3 3| 3 3| 3 3 Wind spd SD(kts)
GST 9 4| 9 4| 8 3 Wind gust(kts)
GSD 4 5| 4 4| 5 4 Wind gust SD(kts)
P12 17 11| 9 5| 7 5 12-hr PoP(%)
Q12 0 0| 0 0| 0 0 12-hr QPF(.01in)
Q24 0| 0| 0 24-hr QPF(.01in)
DUR 0 0| 0 0| 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 16 10| 9 4| 5 8 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 83 83| 86 87| 91 91 Snow level 100s feet MSL
I12 0 0| 0 0| 0 0 12-hr ice(1/100in)
SOL 9 6| 18 13| 28 17 Solar rad (10s W/m2)
STANDARD DEVIATION AND THRESHOLD PROBABILITIES:
KPDX NBM V5.0 NBP GUIDANCE 8/28/2026 1300 UTC
SAT 29| SUN 30| MON 31| TUE 01| WED 02| THU 03| FRI 04| SAT 05| SUN 06|
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 57| 73 54| 74 57| 82 59| 77 58| 67 56| 69 55| 72 56| 76 58| 76 Mean min/max temp(F)
TXNSD 2| 3 3| 3 3| 3 2| 4 3| 6 3| 5 4| 6 3| 7 3| 7 SD min/max temp(F)
TXNP1 55| 69 51| 71 52| 77 57| 71 55| 59 51| 64 50| 66 51| 67 55| 67 10th percentile min/max temp(F)
TXNP2 56| 71 52| 72 55| 79 58| 75 57| 62 55| 66 51| 69 55| 71 56| 71 25th percentile min/max temp(F)
TXNP5 57| 72 54| 75 56| 82 59| 77 58| 67 56| 69 55| 71 56| 75 58| 75 50th percentile min/max temp(F)
TXNP7 59| 76 56| 77 59| 84 61| 79 60| 71 57| 71 57| 75 57| 80 60| 80 75th percentile min/max temp(F)
TXNP9 59| 77 58| 78 60| 86 62| 81 61| 75 60| 75 59| 79 60| 85 62| 85 90th percentile min/max temp(F)
WSPP1 0| 6 0| 5 0| 3 0| 4 4| 4 0| 3 0| 1 0| 3 0| 2 10th percentile wnd(kts)
WSPP2 0| 7 0| 6 3| 3 0| 5 5| 6 4| 4 0| 4 0| 4 0| 4 25th percentile wnd(kts)
WSPP5 3| 8 0| 8 4| 6 0| 7 8| 8 6| 5 3| 5 3| 6 3| 6 50th percentile wnd(kts)
WSPP7 5| 9 3| 9 4| 8 3| 8 10| 10 8| 8 4| 7 5| 8 5| 8 75th percentile wnd(kts)
WSPP9 5| 10 3| 10 5| 9 5| 10 11| 10 10| 9 7| 8 7| 9 8| 9 90th percentile wnd(kts)
W24P1 | 11 | 10 | 8 | 9 | 8 | 9 | 7 | 6 | 7 10th percentile 24hr sustained wnd exceedance(kts)
W24P2 | 12 | 10 | 9 | 10 | 9 | 12 | 8 | 7 | 8 25th percentile 24hr sustained wnd exceedance(kts)
W24P5 | 13 | 12 | 10 | 11 | 11 | 14 | 10 | 9 | 10 50th percentile 24hr sustained wnd exceedance(kts)
W24P7 | 14 | 13 | 11 | 12 | 13 | 15 | 13 | 10 | 11 75th percentile 24hr sustained wnd exceedance(kts)
W24P9 | 15 | 14 | 13 | 13 | 14 | 17 | 14 | 12 | 14 90th percentile 24hr sustained wnd exceedance(kts)
G24P1 | 17 | 15 | 12 | 13 | 12 | 16 | 11 | 10 | 11 10th percentile 24hr wnd gust exceedance(kts)
G24P2 | 19 | 17 | 15 | 15 | 16 | 20 | 14 | 11 | 13 25th percentile 24hr wnd gust exceedance(kts)
G24P5 | 21 | 19 | 17 | 18 | 18 | 23 | 18 | 15 | 16 50th percentile 24hr wnd gust exceedance(kts)
G24P7 | 23 | 21 | 18 | 20 | 20 | 27 | 22 | 18 | 19 75th percentile 24hr wnd gust exceedance(kts)
G24P9 | 24 | 22 | 20 | 21 | 22 | 34 | 28 | 21 | 22 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| 61| 0| 0| 0| 25th percentile 24hr QPF(1/100in)
Q24P5 | 0| 0| 0| 0| 103| 23| 0| 0| 50th percentile 24hr QPF(1/100in)
Q24P7 | 0| 0| 0| 8| 123| 67| 15| 0| 75th percentile 24hr QPF(1/100in)
Q24P9 | 2| 0| 0| 19| 143| 101| 51| 33| 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 017|016 018|013 012|008 011|009 010|009 010|011 012|010 012|011 012|008 10th percentile MSLP(mb)
SLPP2 018|016 019|015 013|009 012|010 012|010 011|012 014|014 016|013 014|012 25th percentile MSLP(mb)
SLPP5 018|017 020|016 014|010 013|011 013|012 013|014 016|016 018|015 017|014 50th percentile MSLP(mb)
SLPP7 019|018 020|017 015|011 014|012 014|014 016|016 019|017 019|018 019|016 75th percentile MSLP(mb)
SLPP9 019|018 021|018 016|012 015|013 016|016 019|017 020|019 021|019 020|017 90th percentile MSLP(mb)