Major Winter Storm to Impact the Mid-Atlantic and Northeast; Inclement Weather in the Pacific Northwest

A major winter storm is expected to bring heavy snow, strong winds, and coastal flooding across the Mid-Atlantic and Northeast that may cause impossible travel conditions and power outages. Blizzard conditions are possible along coastal areas from the DelMarVa Peninsula through southeastern New England. Wet weather and strong winds return to the Pacific Northwest and north-central California. Read More >

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GEG TAF
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HREF Vsby Probs
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Aviation Forecast Discussion

.AVIATION... 00Z TAFS: Moisture continues to stream into the region with a slow saturation. Areas of light rain and mountain snow tonight mainly for terminals along and north of I-90. HREF comes with a 50% chance for cigs to lower below 3000 feet which increases near 60% Monday AM with the arrival of a weak cold front and shift of winds. Ahead of this front, east winds will be in leading to low-level wind shear for PUW and marginal LLWS for COE-SFF-GEG. Once winds shift to the southwest, gusts to 20 mph expected across the eastern Columbia Basin. FORECAST CONFIDENCE AND/OR ALTERNATE SCENARIOS: There is moderate uncertainty with timing of MVFR cigs given wide ranges in precipitaiton duration and timing. This is evident in the HREF probabilities near 50% for cigs below 3000 feet across all terminals along and north of I-90. Alternate scenario for Monday morning is around MWH-EAT which could have breaks in the clouds and potential for broken low stratus. Confidence is not high to keep this prevailing and opted for scattered coverage. /sb ----------------------- 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 222354 CCA
KGEG 222352Z 2300/2324 12005KT P6SM OVC060 PROB30 2300/2304 -RA
     FM230400 14003KT P6SM -RA SCT030 OVC060
     FM230600 16007KT P6SM -RA SCT026 OVC050
     FM231100 15007KT P6SM -RA BKN026 WS020/23036KT
     FM231600 20012G17KT 6SM -RA BR BKN015 OVC040
     FM232000 22010G20KT P6SM -SHRA SCT030 BKN070

Latest Area Terminal Aerodrome Forecasts (TAFs)

FTUS80 KSFF 222339 RRC
KSFF 222336Z 2300/2324 12005KT P6SM OVC060 PROB30 2300/2304 -RA
     FM230400 14003KT P6SM -RA SCT040 OVC060
     FM230600 VRB03KT P6SM -RA BKN035 OVC050
     FM231600 20006KT P6SM -RA BKN022 OVC040
     FM232000 22007G14KT P6SM -SHRA SCT030 BKN070

FTUS46 KOTX 222352 CCA
TAFCOE
TAF COR
KCOE 222352Z 2300/2324 03007KT P6SM -RA OVC070
      PROB30 2300/2304 -RA
     FM230400 04007KT P6SM -RA SCT025 OVC040
     FM230800 07007KT P6SM -RA BKN025 OVC050
     FM231600 20007KT 6SM -RA BR BKN020 OVC040
     FM232200 22009G18KT P6SM -SHRA SCT025 OVC070=

FTUS54 KPUW 222348 CCA
KPUW 222345Z 2300/2324 12008KT P6SM BKN080
     FM230400 10008KT P6SM OVC060 WS020/23030KT
     FM231200 11010KT P6SM OVC050 WS020/23035KT
     FM232300 23008G17KT 6SM -RA BR OVC025

FTUS46 KOTX 222336
TAFLWS
TAF
KLWS 222336Z 2300/2324 VRB04KT P6SM SCT080 OVC100
     FM230500 16011KT P6SM BKN080
     FM231000 13005KT P6SM BKN060=

FTUS80 KMWH 222339 RRC
KMWH 222336Z 2300/2324 30005KT P6SM SCT050 OVC080 PROB30 2300/2304
      -RA
     FM230600 12005KT 4SM -RA BR SCT010 OVC050
     FM231000 18008KT P6SM SCT010 OVC070
      TEMPO 2310/2314 BKN010
     FM231600 23005KT P6SM BKN070

FTUS80 KEAT 222339
KEAT 222336Z 2300/2324 28004KT P6SM SCT030 BKN070 PROB30 2300/2303
      -RA
     FM230600 VRB03KT 6SM -RASN BR BKN025 OVC030
     FM231000 VRB03KT 6SM BR SCT010 BKN100
     FM231600 30004KT P6SM SCT060 BKN100

FTUS80 KSEA 222321 RRU
KSEA 222320Z 2300/2406 17010G18KT 6SM -SHRA SCT025 OVC040
     FM230500 17008KT 6SM -RA OVC025
     FM231000 18007KT 4SM -RA BR OVC015
     FM231500 19006KT 4SM -RA BR OVC010
     FM232200 20005KT 6SM BR VCSH OVC015
     FM240100 21005KT P6SM BKN025

FTUS80 KBOI 222327 RRA
KBOI 222324Z 2300/2324 14013G23KT P6SM SKC
     FM230100 13013KT P6SM FEW080 BKN200

FTUS54 KPDT 222324
KPDT 222322Z 2300/2324 15013KT P6SM BKN100
     FM230600 09003KT 6SM -RA BR OVC025
     FM231200 16006KT 4SM -RA BR OVC050
     FM231800 20008KT P6SM OVC050 AMD NOT SKED

FTUS80 KALW 222324
KALW 222322Z 2300/2324 16015KT P6SM BKN100
     FM230300 20007KT P6SM OVC100
     FM230800 17005KT 6SM -RA BR OVC050

FTUS80 KPSC 222324 RRE
KPSC 222322Z 2300/2324 33012KT P6SM BKN100
     FM230300 VRB05KT P6SM OVC050 PROB30 2306/2312 -RA

FTUS54 KYKM 222324
KYKM 222322Z 2300/2324 VRB03KT P6SM OVC050
     FM230100 23007KT 5SM -RA SCT025 OVC035

FTUS80 KDLS 222324 RRB
KDLS 222322Z 2300/2324 VRB03KT 6SM -RA OVC050
     FM230600 VRB04KT 6SM -RA BR OVC025
     FM231200 VRB03KT 4SM -RA BR OVC050
     FM231700 31006KT P6SM -RA OVC050

FTUS46 KPDT 222322
TAFBDN
TAF
KBDN 222322Z 2300/2324 19015G23KT P6SM OVC070
     FM230200 19011KT P6SM OVC050=

FTUS44 KMSO 222321 RRA
KMSO 222320Z 2300/2324 VRB06KT P6SM SCT100
     FM231500 12010G16KT P6SM VCSH BKN100
     FM232000 23010G25KT P6SM VCSH BKN090

FTUS43 KBTM 222321
KBTM 222320Z 2300/2324 18011G15KT P6SM FEW080
     FM230200 17006KT P6SM BKN100
     FM231500 18012G24KT P6SM BKN100
     FM232000 24014G27KT P6SM BKN090

FTUS80 KSMN 222321 RRV
KSMN 222320Z 2300/2324 16006G15KT P6SM FEW100
     FM230200 15005KT P6SM SCT100
     FM231500 16008G20KT P6SM BKN100
     FM231900 23012G24KT P6SM BKN090

FTUS44 KGPI 222321
KGPI 222320Z 2300/2324 36005KT P6SM FEW080
     FM230300 VRB05KT P6SM BKN050
     FM230800 VRB06KT P6SM VCSH BKN035 OVC050
     FM231500 17012G20KT 4SM -RASN BR OVC035
     FM231700 18013G21KT 6SM -SHRA OVC040

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	0040Z	48	30	50		45	80	6			10			OVC080
KSFF	0040Z	48	32	54		46	80	5			10			OVC100
KCOE	0040Z	43	28	57		37	20	12			10			OVC080
KPUW	0040Z	48	34	58		44	130	9			10			FEW095 SCT120
KLWS	0040Z	55	36	47							10			FEW100
KMWH	0040Z	45	34	66			320	3			10	-RA		BKN050 OVC070
KEAT	0040Z	39	34	81		35	260	6			10			OVC095
--WA--	Time	T	Td	RH	HI	WC	Dir	Wind	G	PK	Vis	Wx	Pcp	Clouds
KS52	0035Z	35	33	94				calm			10			BKN080 OVC110
KOMK	0040Z	36	34	93				calm			10			BKN075 BKN090 OVC110
KS10
KEPH	0040Z	43	34	71		38	300	9			10	-RA		BKN050 OVC065
K63S	0035Z	39	30	70			80	3			10			OVC050
KDEW	0040Z	45	28	53		39	40	12			10			OVC085
KSKA	2355Z	50	32	50		48	140	5			10			OVC075
--ID--	Time	T	Td	RH	HI	WC	Dir	Wind	G	PK	Vis	Wx	Pcp	Clouds
K65S	0035Z	36	27	70				calm			10			BKN075 OVC085
KSZT	0035Z	37	30	75		33	60	5			10			OVC080
KMLP	0040Z	34	23	65			190	3			10			FEW035 OVC060
-PDT TAFs-	Time	T	Td	RH	HI	WC	Dir	Wind	G	PK	Vis	Wx	Pcp	Clouds
KPDT	2253Z	52	36	54			270	15			10			OVC090
KALW	0040Z	48	36	62		45	240	7			10			BKN100 BKN110
KPSC	0040Z	46	34	62		40	290	12			10			OVC095
KYKM	0040Z	46	36	66		44	110	5			10			OVC070
KDLS	0040Z	48	37	66			360	3			10			FEW080 OVC100
KRDM	0040Z	55	30	38			200	9			10			BKN065 OVC080
KBDN	0035Z	55	30	38			210	10	18		10			FEW049 SCT060 BKN075
-MSO TAFs-	Time	T	Td	RH	HI	WC	Dir	Wind	G	PK	Vis	Wx	Pcp	Clouds
KMSO	0040Z	55	19	24				calm			10			CLR
KBTM	0040Z	43	21	42		37	200	10			10			CLR
KSMN	0040Z	52	21	30				calm			10			CLR
KGPI	0040Z	36	21	56				calm			10			OVC090
KHRF	0035Z	55	18	23			210	5			10			FEW110
-Misc-	Time	T	Td	RH	HI	WC	Dir	Wind	G	PK	Vis	Wx	Pcp	Clouds
KSEA	0040Z	50	39	67		46	90	10			10			OVC050
KSMP	2356Z	31	30	96			VRB	3			10	UP		SCT011 OVC100
KELN	0040Z	45	30	57		41	120	7			10			OVC075
K1YT	0028Z	46	34	62				calm			10	-RA		BKN070 OVC085
KRLD	0035Z	47	36	65		44	260	6			10	-RA		OVC090
KGIC	0035Z	50	28	43		44	200	17	28		10			SCT120
K1S5	0035Z	45	38	78				calm			10	-RA		SCT065 OVC080
KHRI	0040Z	48	34	58				calm			10			OVC095
KP69	2352Z	40	38	93				calm

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