NBM Guidance for PORTLAND (KPDX)
45.5958N 122.6092W
Elevation 26 ft
(Nearest NBM location, approximately 3.1 miles ENE)
HOURLY TO 24 HOURS:
KPDX NBM V5.0 NBH GUIDANCE 8/30/2026 0400 UTC
UTC 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 00 01 02 03 04 05 Time (UTC)
PDT 22 23 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 Time (PDT)
TMP 62 60 58 57 56 55 55 54 54 54 56 58 60 63 65 67 69 71 72 73 73 72 69 67 65 Temperature(F)
TSD 2 2 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 2 2 2 2 1 2 2 2 SD of temp(F)
DPT 51 51 52 51 52 52 52 52 52 52 52 52 51 51 50 50 50 50 49 50 49 50 52 52 53 Dew point temp(F)
DSD 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 Dew point temp SD(F)
WBG 58 56 55 55 54 54 54 54 53 53 55 56 57 61 63 65 65 66 65 65 64 64 62 61 60 Wet bulb temp(F)
SKY 7 11 15 10 15 24 39 40 61 84 80 73 62 33 44 38 31 19 8 10 5 6 15 13 5 Sky cover(%)
SSD 9 21 24 15 27 30 37 33 26 18 17 19 31 39 36 40 29 27 15 17 26 22 25 25 5 Sky cover SD(%)
WDR 33 34 33 32 32 30 29 30 9 10 8 36 34 33 33 33 33 33 33 33 33 33 33 33 33 Wind dir (deg)
WSP 5 4 3 0 0 0 0 0 0 0 0 0 3 4 5 6 6 7 8 8 8 7 6 5 5 Wind spd (kts)
WSD 2 2 2 2 2 1 1 1 1 1 1 2 2 2 2 2 2 2 2 1 1 1 1 1 2 Wind spd SD(kts)
GST 7 6 5 4 3 3 2 2 2 2 2 3 5 6 7 8 9 10 12 13 13 11 9 8 8 Wind gust(kts)
GSD 3 2 2 2 2 2 1 1 1 1 1 1 1 1 2 2 2 2 3 2 3 2 2 3 3 Wind gust SD(kts)
P01 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 2 3 3 3 4 4 4 4 3 1-hr PoP(%)
P06 0 1 3 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 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 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 65 64 62 61 62 61 61 60 61 63 66 64 65 72 81 84 91 99101104105106107106105 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 60 45 45 45 45-88-88-88-88-88-88-88-88-88-88-88-88 Ceiling height*
MVC 0 1 2 4 6 11 15 18 17 17 18 16 15 10 8 5 4 2 1 0 0 2 2 1 0 Prob cig<=3000ft(%) MVFR
IFC 0 0 0 0 0 0 0 2 2 3 4 2 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 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 Prob cig<500ft(%) LIFR
LCB -88160130110100 80 80 80 60 45 45 45 45110170190140190140 90 70140 80 70140 Lowest cloud base*
VIS 100100100100100100100100100100100100100100100100100100100100100100100100100 Visibility*
MVV 0 0 0 0 0 0 0 1 2 3 5 2 1 0 0 0 0 0 0 0 0 0 0 0 0 Prob vsby<=5mi(%) MVFR
IFV 0 0 0 0 0 0 0 0 0 1 1 1 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 5 5 5 4 5 4 5 5 6 6 8 16 26 35 37 38 41 39 39 37 33 22 10 6 5 MixHgt 100s feet AGL
TWD 33 34 34 34 34 33 32 32 34 2 36 35 34 34 34 34 34 34 35 35 35 35 35 35 35 Transport wind dir
TWS 10 7 6 6 5 4 3 3 2 3 3 3 5 5 5 6 6 7 8 9 10 10 9 9 9 Transport wind spd(kts)
SOL 0 0 0 0 0 0 0 0 0 2 16 29 43 54 69 69 74 72 64 51 29 13 5 4 3 Solar rad (10s W/m2)
3-HOURLY TO 60 HOURS:
KPDX NBM V5.0 NBS GUIDANCE 8/30/2026 0400 UTC
DT /AUG 30 /
UTC 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 Time (UTC)
PDT 02 05 08 11 14 17 20 23 02 05 08 11 14 17 20 23 02 05 08 11 14 17 20 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 73 55 83 59 72 Max/Min Temp(F)
XND 2 3 3 2 4 SD of max/min temps(F)
TMP 56 54 56 63 69 73 69 63 59 56 57 68 79 83 76 67 63 60 61 64 69 72 68 Temperature(F)
TSD 2 2 2 1 1 2 2 2 2 2 2 2 3 3 3 3 2 2 1 3 4 5 3 SD of temp(F)
DPT 52 52 52 51 50 50 52 53 53 52 52 52 52 50 54 56 56 55 55 54 55 55 56 Dew point temp(F)
DSD 1 1 1 1 2 2 2 1 1 2 2 2 2 2 2 2 2 1 1 1 2 3 2 Dew point temp SD(F)
WBG 54 54 55 61 65 65 62 59 56 54 55 65 72 72 66 63 60 58 58 61 66 65 63 Wet bulb temp(F)
SKY 15 40 80 33 31 10 15 2 24 23 26 13 22 31 47 54 62 74 94 85 78 78 84 Sky cover(%)
SSD 27 33 17 39 29 17 25 2 39 27 37 13 40 38 48 28 24 23 10 12 17 18 16 Sky cover SD(%)
WDR 32 30 8 33 33 33 33 33 33 32 32 33 30 31 32 30 25 20 19 21 23 24 26 Wind dir (deg)
WSP 0 0 0 4 6 8 6 5 6 4 2 4 5 5 4 3 2 4 6 7 8 7 6 Wind spd (kts)
WSD 2 1 1 2 2 1 1 2 2 2 2 2 2 2 3 2 3 2 3 2 3 2 2 Wind spd SD(kts)
GST 3 2 2 6 9 13 9 7 7 5 3 5 6 7 7 4 4 5 8 9 11 11 9 Wind gust(kts)
GSD 2 1 1 1 2 2 2 3 3 2 2 2 3 3 4 3 4 3 3 3 4 5 4 Wind gust SD(kts)
P06 0 1 3 4 3 0 0 0 1 3 22 6-hr PoP(%)
P12 1 4 2 1 19 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 0 0 0 0 Duration of precip(hrs)
T03 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 3-hr Tstm prob(%)
T06 0 0 0 0 0 0 0 0 0 0 1 6-hr Tstm prob(%)
T12 0 0 0 0 1 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 0 0 0 0 0 0 0 0 0 0 0 0 1 5 6 18 37 38 Cond prob of rain(%)
S06 0 0 0 0 0 0 0 0 0 0 0 6-hr snow(1/10in)
SLV 62 60 66 72 91100110110100 98 92 91 95 96 98 95100100 95 93 96 91 85 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 45-88-88-88-88-88-88-88-88-88-88-88-88-88-88-88 45-88-88 43 37 Ceiling height*
IFC 0 2 4 0 0 0 0 0 0 1 10 2 0 0 0 0 3 9 12 3 0 0 0 Prob cig<1000ft(%) IFR
LCB 100 80 45110140 90 80140110250100130150140130160140110 15 24 33 41 34 Lowest cloud base*
VIS 100100100100100100100100100100100100100100100100100100100100100100100 Visibility*
IFV 0 0 1 0 0 0 0 0 0 0 2 0 0 0 0 0 0 2 2 0 0 0 0 Prob vsby<3mi(%) IFR
MHT 5 5 8 35 41 37 10 5 4 4 6 19 33 36 11 6 7 10 18 30 43 47 25 MixHgt 100s feet AGL
TWD 34 32 36 34 34 35 35 35 35 34 36 6 27 31 34 33 32 27 20 21 23 24 26 Transport wind dir
TWS 5 3 3 5 6 9 9 8 6 4 4 5 5 5 8 7 5 4 6 7 8 7 6 Transport wind spd(kts)
SOL 0 0 16 54 74 51 5 2 0 0 16 58 79 50 7 3 0 0 3 20 70 60 4 Solar rad (10s W/m2)
DAILY TO 7 DAYS:
KPDX NBM V5.0 NBE GUIDANCE 8/30/2026 0400 UTC
MON 31| TUE 01| WED 02| THU 03| FRI 04| SAT 05| SUN 06| MON CLIMO
UTC 00 12| 00 12| 00 12| 00 12| 00 12| 00 12| 00 12| 00 Time (UTC)
PDT 17 05 17 05 17 05 17 05 17 05 17 05 17 05 17 Time (PDT)
FHR 20 32| 44 56| 68 80| 92 104|116 128|140 152|164 176|188 Forecast Hour
TXN 73 55| 83 59| 72 59| 67 56| 68 55| 70 55| 73 57| 74 53 78 Max/Min Temp(F)
XND 2 3| 3 2| 4 2| 5 2| 5 3| 6 4| 6 3| 5 SD of max/min temps(F)
TMP 73 56| 83 60| 72 60| 63 58| 66 57| 69 57| 72 57| 74 Temperature(F)
TSD 2 2| 3 2| 5 1| 4 2| 5 3| 6 3| 6 3| 5 SD of temp(F)
DPT 50 52| 50 55| 55 55| 57 55| 54 54| 54 54| 54 54| 54 Dew point temp(F)
DSD 2 2| 2 1| 3 2| 3 2| 4 2| 4 3| 4 3| 4 Dew point temp SD(F)
WBG 65 54| 72 58| 65 58| 61 57| 63 56| 64 56| 66 56| 67 Wet bulb temp(F)
SKY 10 23| 31 74| 78 84| 86 86| 76 84| 31 64| 53 51| 36 Sky cover(%)
SSD 17 27| 38 23| 18 11| 13 12| 28 14| 22 25| 31 18| 23 Sky cover SD(%)
WDR 33 32| 31 20| 24 18| 18 18| 21 17| 29 2| 31 36| 31 Wind dir (deg)
WSP 8 4| 5 4| 7 9| 10 10| 6 5| 5 2| 4 3| 5 Wind spd (kts)
WSD 1 2| 2 2| 2 2| 3 3| 3 3| 3 2| 3 2| 3 Wind spd SD(kts)
GST 13 5| 7 5| 11 19| 19 17| 9 5| 6 3| 6 3| 7 Wind gust(kts)
GSD 2 2| 3 3| 5 5| 8 7| 6 6| 4 2| 3 3| 3 Wind gust SD(kts)
P12 1 4| 2 1| 19 41| 81 92| 75 70| 47 34| 23 19| 17 11 0 12-hr PoP(%)
Q12 0 0| 0 0| 0 5| 37 46| 21 16| 15 5| 2 1| 0 12-hr QPF(.01in)
Q24 0| 0| 5| 83| 37| 20| 3| 26 24-hr QPF(.01in)
DUR 0 0| 0 0| 0 1| 5 7| 4 4| 4 1| 1 0| 0 Duration of precip(hrs)
T12 0 0| 0 0| 1 3| 13 15| 25 11| 15 7| 6 4| 4 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 0 0| 0 1| 37 48| 97 81| 72 52| 49 26| 25 10| 15 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 104 98| 96 101| 91 77| 81 68| 71 71| 76 78| 82 81| 84 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 45 5| 54 3| 38 2| 3 0| 42 5| 17 5| 32 6| 43 Solar rad (10s W/m2)
DAY 8, 9 AND 10:
KPDX NBM V5.0 NBX GUIDANCE 8/30/2026 0400 UTC
MON 07 |TUE 08 |WED 09 |THU 10
UTC 12 |00 12 |00 12 |00 Time (UTC)
PDT 05 |17 05 |17 05 |17 Time (PDT)
FHR 200|212 224|236 248|260 Forecast Hour
TXN 57| 76 59| 77 59| 78 Max/Min Temp(F)
XND 3| 5 2| 7 3| 8 SD of max/min temps(F)
TMP 58| 75 59| 77 60| 77 Temperature(F)
TSD 3| 6 3| 6 3| 7 SD of temp(F)
DPT 54| 55 55| 56 56| 57 Dew point temp(F)
DSD 3| 4 3| 5 3| 5 Dew point temp SD(F)
WBG 56| 68 58| 69 58| 70 Wet bulb temp(F)
SKY 62| 37 61| 34 56| 31 Sky cover(%)
SSD 20| 24 15| 21 10| 16 Sky cover SD(%)
WDR 35| 31 1| 33 36| 31 Wind dir (deg)
WSP 3| 5 4| 6 4| 6 Wind spd (kts)
WSD 3| 3 3| 3 3| 3 Wind spd SD(kts)
GST 4| 7 4| 9 5| 9 Wind gust(kts)
GSD 4| 4 4| 4 5| 4 Wind gust SD(kts)
P12 14| 16 14| 13 9| 16 12-hr PoP(%)
Q12 0| 0 0| 7 0| 1 12-hr QPF(.01in)
Q24 0| 0| 7| 24-hr QPF(.01in)
DUR 0| 0 0| 3 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 8| 14 18| 11 15| 18 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 84| 91 94|100 98| 98 Snow level 100s feet MSL
I12 0| 0 0| 0 0| 0 12-hr ice(1/100in)
SOL 30| 40 17| 29 15| 29 Solar rad (10s W/m2)
STANDARD DEVIATION AND THRESHOLD PROBABILITIES:
KPDX NBM V5.0 NBP GUIDANCE 8/30/2026 0100 UTC
MON 31| TUE 01| WED 02| THU 03| FRI 04| SAT 05| SUN 06| MON 07| TUE 08
UTC 00 12| 00 12| 00 12| 00 12| 00 12| 00 12| 00 12| 00 12| 00 12 Time (UTC)
PDT 17 05| 17 05| 17 05| 17 05| 17 05| 17 05| 17 05| 17 05| 17 05 Time (PDT)
FHR 23 35| 47 59| 71 83| 95 107|119 131|143 155|167 179|191 203|215 227 Forecast Hour
TXNMN 73 56| 83 59| 72 59| 67 56| 68 55| 70 55| 73 57| 74 57| 76 57 Mean min/max temp(F)
TXNSD 2 3| 3 2| 4 1| 5 2| 5 3| 6 4| 6 3| 5 3| 5 3 SD min/max temp(F)
TXNP1 71 52| 79 57| 66 57| 61 51| 62 50| 63 50| 67 51| 68 55| 69 55 10th percentile min/max temp(F)
TXNP2 72 55| 81 58| 70 57| 62 56| 65 55| 66 51| 68 56| 71 56| 73 56 25th percentile min/max temp(F)
TXNP5 73 56| 84 59| 73 59| 65 56| 68 56| 69 56| 72 57| 74 58| 76 58 50th percentile min/max temp(F)
TXNP7 74 59| 85 60| 75 60| 71 57| 71 57| 73 58| 77 59| 78 59| 79 59 75th percentile min/max temp(F)
TXNP9 75 59| 86 61| 78 60| 74 58| 72 58| 80 60| 80 60| 80 60| 82 60 90th percentile min/max temp(F)
WSPP1 6 0| 3 0| 4 5| 5 0| 2 0| 0 0| 0 0| 0 0| 0 0 10th percentile wnd(kts)
WSPP2 7 3| 4 0| 5 7| 7 4| 3 0| 3 0| 3 0| 3 0| 3 0 25th percentile wnd(kts)
WSPP5 8 4| 5 4| 7 8| 9 6| 6 4| 5 2| 4 3| 5 3| 5 3 50th percentile wnd(kts)
WSPP7 9 5| 6 5| 8 9| 10 9| 8 6| 6 4| 6 4| 7 4| 6 5 75th percentile wnd(kts)
WSPP9 9 6| 7 6| 10 10| 11 10| 10 8| 8 5| 7 5| 8 6| 8 7 90th percentile wnd(kts)
W24P1 9 | 7 | 8 | 11 | 7 | 6 | 5 | 6 | 6 10th percentile 24hr sustained wnd exceedance(kts)
W24P2 10 | 8 | 10 | 13 | 9 | 7 | 7 | 7 | 7 25th percentile 24hr sustained wnd exceedance(kts)
W24P5 10 | 9 | 11 | 14 | 11 | 9 | 8 | 9 | 9 50th percentile 24hr sustained wnd exceedance(kts)
W24P7 11 | 10 | 12 | 16 | 13 | 12 | 9 | 10 | 10 75th percentile 24hr sustained wnd exceedance(kts)
W24P9 12 | 12 | 14 | 18 | 17 | 14 | 11 | 12 | 13 90th percentile 24hr sustained wnd exceedance(kts)
G24P1 14 | 11 | 12 | 20 | 10 | 10 | 9 | 9 | 10 10th percentile 24hr wnd gust exceedance(kts)
G24P2 15 | 12 | 16 | 22 | 14 | 12 | 10 | 12 | 11 25th percentile 24hr wnd gust exceedance(kts)
G24P5 17 | 14 | 18 | 25 | 19 | 15 | 13 | 14 | 14 50th percentile 24hr wnd gust exceedance(kts)
G24P7 18 | 17 | 20 | 29 | 24 | 19 | 15 | 17 | 17 75th percentile 24hr wnd gust exceedance(kts)
G24P9 19 | 19 | 24 | 34 | 27 | 23 | 19 | 20 | 20 90th percentile 24hr wnd gust exceedance(kts)
Q24P1 0| 0| 0| 12| 0| 0| 0| 0| 0 10th percentile 24hr QPF(1/100in)
Q24P2 0| 0| 0| 79| 20| 0| 0| 0| 0 25th percentile 24hr QPF(1/100in)
Q24P5 0| 0| 0| 103| 57| 8| 0| 0| 0 50th percentile 24hr QPF(1/100in)
Q24P7 0| 0| 9| 126| 90| 44| 7| 0| 0 75th percentile 24hr QPF(1/100in)
Q24P9 0| 0| 22| 154| 110| 83| 41| 22| 30 90th percentile 24hr QPF(1/100in)
S24P1 0| 0| 0| 0| 0| 0| 0| 0| 0 10th percentile 24hr snow accum(1/10in)
S24P2 0| 0| 0| 0| 0| 0| 0| 0| 0 25th percentile 24hr snow accum(1/10in)
S24P5 0| 0| 0| 0| 0| 0| 0| 0| 0 50th percentile 24hr snow accum(1/10in)
S24P7 0| 0| 0| 0| 0| 0| 0| 0| 0 75th percentile 24hr snow accum(1/10in)
S24P9 0| 0| 0| 0| 0| 0| 0| 0| 0 90th percentile 24hr snow accum(1/10in)
I24P1 0| 0| 0| 0| 0| 0| 0| 0| 0 10th percentile 24hr ice accum(1/100in)
I24P2 0| 0| 0| 0| 0| 0| 0| 0| 0 25th percentile 24hr ice accum(1/100in)
I24P5 0| 0| 0| 0| 0| 0| 0| 0| 0 50th percentile 24hr ice accum(1/100in)
I24P7 0| 0| 0| 0| 0| 0| 0| 0| 0 75th percentile 24hr ice accum(1/100in)
I24P9 0| 0| 0| 0| 0| 0| 0| 0| 0 90th percentile 24hr ice accum(1/100in)
SLPP1 014 012|006 010|008 008|007 009|010 011|010 011|012 014|012 012|010 011 10th percentile MSLP(mb)
SLPP2 014 012|007 011|010 010|009 010|011 012|012 013|013 015|014 015|012 014 25th percentile MSLP(mb)
SLPP5 015 013|008 012|011 011|010 012|012 014|013 016|014 017|016 017|015 018 50th percentile MSLP(mb)
SLPP7 016 013|009 013|011 012|012 014|013 016|015 017|017 019|018 019|018 020 75th percentile MSLP(mb)
SLPP9 016 014|010 014|012 013|012 015|015 016|017 019|018 020|019 021|019 022 90th percentile MSLP(mb)