Heavy Rainfall to Bring Flooding Threat to California; Heavy Snow in the Sierra

A strong atmospheric river will bring heavy rainfall to California through the holiday week. The heaviest rainfall is expected on Wednesday in the Los Angeles Basin. Flash and urban flooding is possible. A prolonged heavy snowfall is expected in the Sierra Nevada from the atmospheric river, raising concerns for major snow‐load impacts. Travel may be difficult to impossible over the passes. Read More >

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Aviation Forecast Discussion

.AVIATION... 06Z TAFs: A deepening low pressure off OR/WA coast will bring strengthening low level southerly flow to central and eastern WA Wednesday morning. With lighter surface winds, expecting widespread LLWS developing after 12z. Bands of precipitation will lift through the area with periodic precipitation for the eastern third of WA and North Idaho. Precipitation will be more persistent in the Cascades where probabilities are higher for MVFR/IFR cigs/vis. Pockets of freezing rain expected over the Waterville Plateau and southern Okanogan Valley where localized temps are at freezing. Precip type mainly snow for the Methow Valley and Winthrop. A cold front will press through 17-21z delivering organized precipitation from west to east and eventually a shift in winds back to the southwest. The southwest upsloping flow will bring moderate chances for developing stratus GEG-COE after 06z. .FORECAST CONFIDENCE AND/OR ALTERNATE SCENARIOS: Moderate confidence for prevailing VFR conditions. Low confidence in hourly restrictions at LWS which is bouncing in and out of shallow fog. LWS will also have potential for a brief period of gusty winds as high winds develop to the south 15-22z. Probabilities for the high winds to reach LWS are low and LLWS is more likely. ----------------------- Confidence descriptors: Low - Less than a 30 percent chance Moderate - 30 to 70 percent chance High - Greater than a 70 percent chance For additional probabilistic information for NWS Spokane airports,please refer to the Aviation Dashboard on our webpage: https:/www.weather.gov/otx/avndashboard &&

Latest GEG Terminal Aerodrome Forecast (TAF)

FTUS44 KGEG 240539
KGEG 240537Z 2406/2506 04007KT P6SM SCT040 OVC090 PROB30 2406/2412
      -RA BKN040
     FM241200 05007KT P6SM -RA OVC050 WS020/15040KT
     FM241800 11008G15KT 6SM -RA OVC090 WS020/19030KT
     FM250100 20015G21KT P6SM OVC070
     FM250400 20009G15KT P6SM SCT009 BKN080

Latest Area Terminal Aerodrome Forecasts (TAFs)

FTUS44 KSFF 240539 RRA
KSFF 240537Z 2406/2506 26003KT P6SM SCT050 BKN080 OVC100 PROB30
      2406/2412 -RA BKN040
     FM241200 07005KT P6SM -RA BKN050 WS020/16040KT
     FM241800 11009KT 6SM -RA OVC080 WS020/19030KT
     FM250100 20013G21KT P6SM OVC070
     FM250400 20006G12KT P6SM SCT010 BKN080

FTUS46 KOTX 240537
TAFCOE
TAF
KCOE 240537Z 2406/2506 02009KT P6SM -RA BKN045 OVC060
     FM241200 02008KT P6SM OVC060 WS020/16035KT
      PROB30 2412/2418 6SM -RA OVC080
     FM241800 10011KT 6SM -RA OVC050 WS020/15040KT
     FM250100 20012KT P6SM OVC070
      PROB30 2501/2503 6SM -RA OVC045
     FM250400 20006KT P6SM SCT010 BKN080=

FTUS54 KPUW 240539 RRB
KPUW 240537Z 2406/2506 11009KT P6SM OVC110 PROB30 2412/2418 6SM
      -RA
      OVC080
     FM241800 14015KT P6SM OVC100 WS020/16040KT PROB30
      2418/2421
      6SM -RA OVC090
     FM242100 12011G18KT P6SM BKN090 WS020/18035KT PROB30
      2421/2424
      6SM -RA OVC070
     FM250100 23010G20KT P6SM BKN070
     FM250500 24006KT P6SM BKN100

FTUS46 KOTX 240537
TAFLWS
TAF
KLWS 240537Z 2406/2506 00000KT 3SM BCFG BR SCT001 SCT110
      TEMPO 2406/2410 1SM BR
     FM241800 13009KT P6SM OVC110 WS020/15040KT
      TEMPO 2419/2421 18020G30KT
     FM242100 13009KT P6SM OVC110
     FM250300 22011G18KT P6SM BKN090=

FTUS44 KMWH 240718 AAA
KMWH 240716Z 2407/2506 35008KT P6SM BKN020
     FM241200 01010KT P6SM BKN027 BKN060 WS020/12035KT PROB30
      2412/2417 6SM -RA OVC080
     FM241700 01010G18KT 6SM -RA OVC030
     FM242000 02008KT P6SM BKN027
     FM242200 22012G21KT P6SM BKN045
     FM250200 20008KT P6SM SCT150

FTUS80 KEAT 240539 RRC
KEAT 240537Z 2406/2506 32005KT P6SM SCT040 BKN100 OVC110
     FM240800 31007KT 6SM -RA OVC020
     FM240900 31008KT 5SM BR SCT005 OVC018 PROB30 2409/2412 6SM
      -RA
      OVC080
     FM241400 31009KT 2SM -RA BKN005 OVC011
     FM242000 29006KT P6SM BKN011
     FM250000 30008KT P6SM SCT005 BKN150

FTUS80 KSEA 240900 AAB
KSEA 240858Z 2409/2512 01011KT P6SM -RA OVC050
     FM241200 01012G25KT P6SM -RA OVC045 WS020/09030KT
     FM241500 04015G27KT P6SM -RA OVC035
     FM241900 16020G33KT P6SM -RA OVC020
     FM242200 18030G45KT P6SM -RA BKN015 OVC020
     FM250200 20010G20KT P6SM OVC025
     FM250600 12006KT P6SM OVC025

FTUS80 KBOI 240554 CCA
KBOI 240552Z 2406/2506 12014KT P6SM BKN150 WS020/15040KT
     FM240800 12017G27KT P6SM BKN120
     FM241600 13020G35KT P6SM VCSH OVC060 PROB30 2416/2422 -RA
      OVC050
     FM242200 13015G25KT P6SM OVC050

FTUS54 KPDT 240739 AAA
KPDT 240736Z 2408/2506 VRB03KT 1SM BR OVC003
     FM241300 04006KT P6SM OVC070
     FM241700 15027G40KT P6SM BKN070 OVC100
     FM250000 28008KT P6SM OVC100
     FM250300 13004KT P6SM OVC050

FTUS80 KALW 240533
KALW 240530Z 2406/2506 VRB03KT 1/4SM FG OVC003
     FM241400 16009KT 4SM BR OVC003
     FM241700 20025G35KT P6SM OVC035
     FM242000 18010KT P6SM OVC050
     FM250100 17006KT 6SM BR OVC010

FTUS80 KPSC 240533 RRC
KPSC 240530Z 2406/2506 32004KT P6SM BKN120 OVC250
     FM250000 25005KT P6SM OVC100
     FM250200 18003KT P6SM BKN250

FTUS54 KYKM 240533 RRA
KYKM 240530Z 2406/2506 35005KT 6SM -RA BR OVC035 PROB30 2406/2408
      4SM -RASN BR OVC015
     FM241000 29006KT 6SM -RA BR BKN015 OVC030
     FM241500 24004KT 5SM BR SCT015 OVC020
     FM242300 25004KT P6SM SCT015 OVC040
     FM250500 29003KT 6SM BR OVC025

FTUS80 KDLS 240533
KDLS 240530Z 2406/2506 07003KT 6SM -RA BR OVC020
     FM241000 VRB02KT P6SM OVC015
     FM241400 VRB03KT P6SM OVC020
     FM242300 32006KT P6SM OVC035
     FM250200 VRB02KT P6SM BKN015

FTUS46 KPDT 240740 AAA
TAFBDN
TAF AMD
KBDN 240740Z 2408/2506 30004KT P6SM OVC007
     FM240900 32006KT 3/4SM BR OVC004
     FM241030 31006KT 2SM BR BKN015 OVC035
     FM241200 20018G27KT P6SM BKN050 OVC080
     FM250000 34005KT P6SM BKN250=

FTUS80 KMSO 240915 AAA
KMSO 240914Z 2409/2506 00000KT 1SM BR BKN006 OVC011
     FM241500 10005KT P6SM BKN100
     FM241900 10012KT P6SM BKN100
     FM250000 10007KT 5SM -RA SCT020 OVC035

FTUS43 KBTM 240521
KBTM 240520Z 2406/2506 33005KT P6SM SKC
     FM241900 14010G18KT P6SM BKN150
     FM250000 13008G16KT 4SM -RA OVC030

FTUS80 KSMN 240521 RRX
KSMN 240520Z 2406/2506 16004KT 1/4SM FZFG OVC001
     FM241300 00000KT 1SM BR SCT005 OVC015
     FM241500 00000KT P6SM SCT010
     FM242100 14008G16KT P6SM BKN150
     FM242300 18012KT 5SM -RA SCT020 OVC035

FTUS80 KGPI 240915 AAA
KGPI 240913Z 2409/2506 VRB03KT P6SM OVC100
     FM241200 VRB04KT P6SM BKN035
     FM242200 15005KT 5SM -RA SCT020 OVC035

Raw METARs for WFO OTX CWA and Surrounding Areas

--TAFs--	Time	T	Td	RH	HI	WC	Dir	Wind	G	PK	Vis	Wx	Pcp	Clouds
KGEG	1010Z	36	34	93		30	60	8			10			CLR
KSFF	1010Z	37	36	93				calm			10			CLR
KCOE	1010Z	37	36	93		28	30	14			10			CLR
KPUW	1010Z	43	37	81		35	90	16			10			OVC100
KLWS	1010Z	37	36	93		32	110	6			10			CLR
KMWH	1010Z	39	36	87		33	330	9			10	-RA		BKN060 OVC095
KEAT	1010Z	34	32	93		29	290	6			2 1/2	-SN BR	0.02	FEW007 BKN011 OVC025
--WA--	Time	T	Td	RH	HI	WC	Dir	Wind	G	PK	Vis	Wx	Pcp	Clouds
KS52	0955Z	30						calm			2	-SN BR	0.01	BKN033 BKN042 OVC100
KOMK	1011Z	33	32	96		23	340	14			4	-SN BR	T	SCT007 BKN010 OVC036
KS10
KEPH	1010Z	37	34	87		28	330	15			10			SCT080 BKN100 BKN110
K63S	0950Z	36	34	93				calm			9			SCT025 BKN034 OVC055
KDEW	1010Z	37	34	87		28	30	14			10			CLR
KSKA	0955Z	36	35	95		28	50	12			10		T	FEW100 FEW130 BKN180 BKN230
--ID--	Time	T	Td	RH	HI	WC	Dir	Wind	G	PK	Vis	Wx	Pcp	Clouds
K65S	0955Z	36	34	93				calm			8			BKN026 BKN049 OVC070
KSZT	0950Z	36	34	93		26	40	17	22		10			OVC090
KMLP	1010Z	28	28	100		21	200	6			3/4	UP BR	0.01	BKN024 OVC055
-PDT TAFs-	Time	T	Td	RH	HI	WC	Dir	Wind	G	PK	Vis	Wx	Pcp	Clouds
KPDT	1010Z	36	36	100		32	330	5			2	BR		OVC002
KALW	1010Z	37	36	93		32	230	6			1 1/4	BR		OVC002
KPSC	1010Z	39	37	93		35	310	6			10	-RA	0.01	BKN075 OVC090
KYKM	1010Z	37	36	93		31	280	8			10	-RA		BKN034 OVC095
KDLS	1010Z	39	37	93		34	120	7			10			OVC026
KRDM	1010Z	34	34	100				calm			10			OVC002
KBDN	0955Z	34	32	93				calm			1	BR		OVC003
-MSO TAFs-	Time	T	Td	RH	HI	WC	Dir	Wind	G	PK	Vis	Wx	Pcp	Clouds
KMSO	1010Z	32	32	100			280	3			1/4	FG		VV007
KBTM	1010Z	28	25	86			90	3			10			CLR
KSMN	1010Z	18	18	100				calm			M1/4	FZFG		OVC003
KGPI	1010Z	32	30	93				calm			8			OVC100
KHRF	0955Z	34	34	100				calm			1/4	FG		OVC002
-Misc-	Time	T	Td	RH	HI	WC	Dir	Wind	G	PK	Vis	Wx	Pcp	Clouds
KSEA	1010Z	41	36	81		32	10	18			10			BKN080 OVC095
KSMP	0956Z	30	30	100			100	3		35	6	UP BR		BKN002 OVC008
KELN	1010Z	34	32	93				calm			5	-RA BR	0.01	OVC028
K1YT	0955Z	39	35	84		35	50	5			10	-RA	T	SCT026 BKN032 OVC045
KRLD	0955Z	43	38	85		38	320	8			10			SCT025 SCT065 BKN095
KGIC	0955Z	32	32	100				calm			1/2			OVC001
K1S5	1015Z	38	36	93		33	230	7			10	-RA		BKN070 BKN080 OVC090
KHRI	1010Z	39	37	93				calm			10			BKN023 BKN070 OVC095
KP69	0952Z	38	36	93			VRB	3

Lowest Expected Flight Category Forecasts - EXPERIMENTAL

•This site is for informational purposes. It should be used with other preflight information sources needed to satisfy all the requirements of 14 CFR 91.103. It is NOT designed to be used as a primary or sole source of information for preflight action. Refer to Flight Service for more information.

0-1 hr Ceiling Forecast	0-1 hr Visibility Forecast

1-2 hr Ceiling Forecast	1-2 hr Visibility Forecast

2-3 hr Ceiling Forecast	2-3 hr Visibility Forecast

3-4 hr Ceiling Forecast	3-4 hr Visibility Forecast

4-5 hr Ceiling Forecast	4-5 hr Visibility Forecast

5-6 hr Ceiling Forecast	5-6 hr Visibility Forecast

6-12 hr Ceiling Forecast	6-12 hr Visibility Forecast

12-18 hr Ceiling Forecast	12-18 hr Visibility Forecast

18-24 hr Ceiling Forecast	18-24 hr Visibility Forecast

HREF Ceiling Probabilities - EXPERIMENTAL

•These plots are produced by HREF ensemble guidance and are for informational purposes. It should be used with other preflight information sources needed to satisfy all the requirements of 14 CFR 91.103. It is NOT designed to be used as a primary or sole source of information for preflight action. Refer to Flight Service for more information.

0-1 hr Probability of Ceiling < 1000 ft	0-1 hr Probability of Ceiling < 2000 ft	0-1 hr Probability of Ceiling < 3000 ft

1-2 hr Probability of Ceiling < 1000 ft	1-2 hr Probability of Ceiling < 2000 ft	1-2 hr Probability of Ceiling < 3000 ft

2-3 hr Probability of Ceiling < 1000 ft	2-3 hr Probability of Ceiling < 2000 ft	2-3 hr Probability of Ceiling < 3000 ft

3-4 hr Probability of Ceiling < 1000 ft	3-4 hr Probability of Ceiling < 2000 ft	3-4 hr Probability of Ceiling < 3000 ft

4-5 hr Probability of Ceiling < 1000 ft	4-5 hr Probability of Ceiling < 2000 ft	4-5 hr Probability of Ceiling < 3000 ft

5-6 hr Probability of Ceiling < 1000 ft	5-6 hr Probability of Ceiling < 2000 ft	5-6 hr Probability of Ceiling < 3000 ft

6-12 hr Probability of Ceiling < 1000 ft	6-12 hr Probability of Ceiling < 2000 ft	6-12 hr Probability of Ceiling < 3000 ft

12-18 hr Probability of Ceiling < 1000 ft	12-18 hr Probability of Ceiling < 2000 ft	12-18 hr Probability of Ceiling < 3000 ft

18-24 hr Probability of Ceiling < 1000 ft	18-24 hr Probability of Ceiling < 2000 ft	18-24 hr Probability of Ceiling < 3000 ft

HREF Visibility Probabilities - EXPERIMENTAL

0-1 hr Probability of Visibility < 0.25 mi	0-1 hr Probability of Visibility < 0.5 mi	0-1 hr Probability of Visibility < 1 mi

1-2 hr Probability of Visibility < 0.25 mi	1-2 hr Probability of Visibility < 0.5 mi	1-2 hr Probability of Visibility < 1 mi

2-3 hr Probability of Visibility < 0.25 mi	2-3 hr Probability of Visibility < 0.5 mi	2-3 hr Probability of Visibility < 1 mi

3-4 hr Probability of Visibility < 0.25 mi	3-4 hr Probability of Visibility < 0.5 mi	3-4 hr Probability of Visibility < 1 mi

4-5 hr Probability of Visibility < 0.25 mi	4-5 hr Probability of Visibility < 0.5 mi	4-5 hr Probability of Visibility < 1 mi

5-6 hr Probability of Visibility < 0.25 mi	5-6 hr Probability of Visibility < 0.5 mi	5-6 hr Probability of Visibility < 1 mi

6-12 hr Probability of Visibility < 0.25 mi	6-12 hr Probability of Visibility < 0.5 mi	6-12 hr Probability of Visibility < 1 mi

12-18 hr Probability of Visibility < 0.25 mi	12-18 hr Probability of Visibility < 0.5 mi	12-18 hr Probability of Visibility < 1 mi

18-24 hr Probability of Visibility < 0.25 mi	18-24 hr Probability of Visibility < 0.5 mi	18-24 hr Probability of Visibility < 1 mi


0-1 hr Probability of Visibility < 2 mi	0-1 hr Probability of Visibility < 4 mi

1-2 hr Probability of Visibility < 2 mi	1-2 hr Probability of Visibility < 4 mi

2-3 hr Probability of Visibility < 2 mi	2-3 hr Probability of Visibility < 4 mi

3-4 hr Probability of Visibility < 2 mi	3-4 hr Probability of Visibility < 4 mi

4-5 hr Probability of Visibility < 2 mi	4-5 hr Probability of Visibility < 4 mi

5-6 hr Probability of Visibility < 2 mi	5-6 hr Probability of Visibility < 4 mi

6-12 hr Probability of Visibility < 2 mi	6-12 hr Probability of Visibility < 4 mi

12-18 hr Probability of Visibility < 2 mi	12-18 hr Probability of Visibility < 4 mi

18-24 hr Probability of Visibility < 2 mi	18-24 hr Probability of Visibility < 4 mi