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Point Forecast: Washington-Dulles International Airport VA  38.95N 77.44W (Elev. 285 ft)	Last Update: 11:45 am EDT May 9, 2021

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Weather Elements Weather/Precipitation Fire Weather Temperature (°F) Dewpoint (°F) Heat Index (°F) Surface Wind  ktmphkm/hm/s Sky Cover (%) Precipitation Potential (%) Relative Humidity (%) Rain Thunder Fog Mixing Height  x100ftx100m Haines Index Lightning Activity Level Trans. Wind  ktmphkm/hm/s Vent Rate (x1000 mph-ft) Atmospheric Dispersion Index Low Visibility Occurrence Risk Index

48-Hour Period Starting: 1pm Sun, May 9 20212pm Sun, May 9 20213pm Sun, May 9 20214pm Sun, May 9 20215pm Sun, May 9 20216pm Sun, May 9 20217pm Sun, May 9 20218pm Sun, May 9 20219pm Sun, May 9 202110pm Sun, May 9 202111pm Sun, May 9 202112am Mon, May 10 20211am Mon, May 10 20212am Mon, May 10 20213am Mon, May 10 20214am Mon, May 10 20215am Mon, May 10 20216am Mon, May 10 20217am Mon, May 10 20218am Mon, May 10 20219am Mon, May 10 202110am Mon, May 10 202111am Mon, May 10 202112pm Mon, May 10 20211pm Mon, May 10 20212pm Mon, May 10 20213pm Mon, May 10 20214pm Mon, May 10 20215pm Mon, May 10 20216pm Mon, May 10 20217pm Mon, May 10 20218pm Mon, May 10 20219pm Mon, May 10 202110pm Mon, May 10 202111pm Mon, May 10 202112am Tue, May 11 20211am Tue, May 11 20212am Tue, May 11 20213am Tue, May 11 20214am Tue, May 11 20215am Tue, May 11 20216am Tue, May 11 20217am Tue, May 11 20218am Tue, May 11 20219am Tue, May 11 202110am Tue, May 11 202111am Tue, May 11 202112pm Tue, May 11 20211pm Tue, May 11 20212pm Tue, May 11 20213pm Tue, May 11 20214pm Tue, May 11 20215pm Tue, May 11 20216pm Tue, May 11 20217pm Tue, May 11 20218pm Tue, May 11 20219pm Tue, May 11 202110pm Tue, May 11 202111pm Tue, May 11 202112am Wed, May 12 20211am Wed, May 12 20212am Wed, May 12 20213am Wed, May 12 20214am Wed, May 12 20215am Wed, May 12 20216am Wed, May 12 20217am Wed, May 12 20218am Wed, May 12 20219am Wed, May 12 202110am Wed, May 12 202111am Wed, May 12 202112pm Wed, May 12 20211pm Wed, May 12 20212pm Wed, May 12 20213pm Wed, May 12 20214pm Wed, May 12 20215pm Wed, May 12 20216pm Wed, May 12 20217pm Wed, May 12 20218pm Wed, May 12 20219pm Wed, May 12 202110pm Wed, May 12 202111pm Wed, May 12 202112am Thu, May 13 20211am Thu, May 13 20212am Thu, May 13 20213am Thu, May 13 20214am Thu, May 13 20215am Thu, May 13 20216am Thu, May 13 20217am Thu, May 13 20218am Thu, May 13 20219am Thu, May 13 202110am Thu, May 13 202111am Thu, May 13 202112pm Thu, May 13 20211pm Thu, May 13 20212pm Thu, May 13 20213pm Thu, May 13 20214pm Thu, May 13 20215pm Thu, May 13 20216pm Thu, May 13 20217pm Thu, May 13 20218pm Thu, May 13 20219pm Thu, May 13 202110pm Thu, May 13 202111pm Thu, May 13 202112am Fri, May 14 2021

Date	05/09											05/10
Hour (EDT)	13	14	15	16	17	18	19	20	21	22	23	00	01	02	03	04	05	06	07	08	09	10	11	12
Temperature (°F)	60	61	64	65	66	67	66	66	65	65	65	64	63	64	62	61	60	56	55	56	57	59	60	62
Dewpoint (°F)	37	38	40	42	43	45	46	49	49	50	50	50	51	51	51	51	50	47	47	47	45	44	44	44
Heat Index (°F)
Surface Wind (mph)	15	16	18	21	24	18	15	13	13	15	18	15	15	14	18	16	15	14	14	15	15	15	14	14
Wind Dir	S	S	S	S	S	S	S	S	S	SW	SW	SW	SW	W	NW	NW	NW	NW	NW	NW	NW	NW	NW	NW
Gust	23	24	29	30	36	29	22	18	20	23	28	23	23	21	28	24	23	21	22	23	23	22	21	21
Sky Cover (%)	69	60	53	92	100	100	100	100	99	100	99	99	100	100	100	99	89	79	74	68	61	55	42	33
Precipitation Potential (%)	13	5	5	5	13	13	13	41	41	41	41	41	41	41	41	41	41	41	41	1	1	1	1	1
Relative Humidity (%)	42	42	41	43	43	45	48	54	56	58	58	60	65	63	67	70	69	72	74	72	64	57	55	52
Rain	--	--	--	--	--	--	--	Chc	Chc	Chc	Chc	Chc	Chc	Chc	Chc	Chc	Chc	Chc	Chc	--	--	--	--	--
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Fog	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Date												05/11
Hour (EDT)	13	14	15	16	17	18	19	20	21	22	23	00	01	02	03	04	05	06	07	08	09	10	11	12
Temperature (°F)	63	63	64	65	64	63	61	59	57	55	53	52	51	50	49	48	47	47	48	50	53	56	59	61
Dewpoint (°F)	42	42	41	40	40	40	39	39	38	38	37	37	36	36	36	35	35	35	36	36	35	35	34	34
Heat Index (°F)
Surface Wind (mph)	14	14	14	14	14	11	9	8	7	7	7	7	7	7	7	7	7	7	7	8	9	10	10	10
Wind Dir	NW	NW	NW	NW	NW	NW	NW	NW	NW	N	N	N	N	N	NW	NW	NW	NW	NW	NW	NW	NW	NW	NW
Gust	22	22	21	21	21
Sky Cover (%)	31	33	31	22	14	18	25	29	30	32	36	43	52	61	68	72	72	65	55	45	36	21	23	28
Precipitation Potential (%)	1	1	1	1	1	1	1	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3
Relative Humidity (%)	46	46	43	40	41	43	44	47	49	53	54	56	56	58	61	60	63	63	63	58	50	45	39	36
Rain	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Fog	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--

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