Point Forecast: Chantilly VA  38.88N 77.4W (Elev. 358 ft)	Last Update: 7:32 pm EDT May 9, 2024

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Weather Elements Fire Weather Aviation 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 Ceiling Height Visibility

48-Hour Period Starting: 9pm Thu, May 9 202410pm Thu, May 9 202411pm Thu, May 9 202412am Fri, May 10 20241am Fri, May 10 20242am Fri, May 10 20243am Fri, May 10 20244am Fri, May 10 20245am Fri, May 10 20246am Fri, May 10 20247am Fri, May 10 20248am Fri, May 10 20249am Fri, May 10 202410am Fri, May 10 202411am Fri, May 10 202412pm Fri, May 10 20241pm Fri, May 10 20242pm Fri, May 10 20243pm Fri, May 10 20244pm Fri, May 10 20245pm Fri, May 10 20246pm Fri, May 10 20247pm Fri, May 10 20248pm Fri, May 10 20249pm Fri, May 10 202410pm Fri, May 10 202411pm Fri, May 10 202412am Sat, May 11 20241am Sat, May 11 20242am Sat, May 11 20243am Sat, May 11 20244am Sat, May 11 20245am Sat, May 11 20246am Sat, May 11 20247am Sat, May 11 20248am Sat, May 11 20249am Sat, May 11 202410am Sat, May 11 202411am Sat, May 11 202412pm Sat, May 11 20241pm Sat, May 11 20242pm Sat, May 11 20243pm Sat, May 11 20244pm Sat, May 11 20245pm Sat, May 11 20246pm Sat, May 11 20247pm Sat, May 11 20248pm Sat, May 11 20249pm Sat, May 11 202410pm Sat, May 11 202411pm Sat, May 11 202412am Sun, May 12 20241am Sun, May 12 20242am Sun, May 12 20243am Sun, May 12 20244am Sun, May 12 20245am Sun, May 12 20246am Sun, May 12 20247am Sun, May 12 20248am Sun, May 12 20249am Sun, May 12 202410am Sun, May 12 202411am Sun, May 12 202412pm Sun, May 12 20241pm Sun, May 12 20242pm Sun, May 12 20243pm Sun, May 12 20244pm Sun, May 12 20245pm Sun, May 12 20246pm Sun, May 12 20247pm Sun, May 12 20248pm Sun, May 12 20249pm Sun, May 12 202410pm Sun, May 12 202411pm Sun, May 12 202412am Mon, May 13 20241am Mon, May 13 20242am Mon, May 13 20243am Mon, May 13 20244am Mon, May 13 20245am Mon, May 13 20246am Mon, May 13 20247am Mon, May 13 20248am Mon, May 13 20249am Mon, May 13 202410am Mon, May 13 202411am Mon, May 13 202412pm Mon, May 13 20241pm Mon, May 13 20242pm Mon, May 13 20243pm Mon, May 13 20244pm Mon, May 13 20245pm Mon, May 13 20246pm Mon, May 13 20247pm Mon, May 13 20248pm Mon, May 13 20249pm Mon, May 13 202410pm Mon, May 13 202411pm Mon, May 13 202412am Tue, May 14 20241am Tue, May 14 20242am Tue, May 14 20243am Tue, May 14 20244am Tue, May 14 20245am Tue, May 14 20246am Tue, May 14 20247am Tue, May 14 20248am Tue, May 14 2024

Date	05/09			05/10
Hour (EDT)	21	22	23	00	01	02	03	04	05	06	07	08	09	10	11	12	13	14	15	16	17	18	19	20
Temperature (°F)	68	66	65	64	63	62	61	59	58	57	56	58	58	58	60	60	62	62	62	61	59	59	58	57
Dewpoint (°F)	56	56	56	56	56	56	56	56	56	56	56	55	56	55	54	54	53	52	52	51	51	50	49	49
Heat Index (°F)
Surface Wind (mph)	8	7	7	7	6	6	6	5	5	5	6	6	7	7	8	8	8	8	8	8	8	7	7	7
Wind Dir	E	E	E	E	E	E	E	E	E	NE	NE	NE	NE	NE	E	NE	NE	NE	NE	NE	NE	NE	NE	NE
Gust
Sky Cover (%)	91	88	86	84	86	88	88	89	89	88	88	87	89	91	93	93	93	92	92	93	93	92	91	90
Precipitation Potential (%)	54	44	62	52	40	30	26	25	26	25	27	46	46	46	46	46	46	69	69	69	69	69	69	51
Relative Humidity (%)	65	70	73	75	78	81	84	90	93	96	100	90	93	90	81	81	72	70	70	70	75	72	72	75
Rain	Chc	Chc	Lkly	Chc	Chc	Chc	Chc	Chc	Chc	Chc	Chc	Chc	Chc	Chc	Chc	Chc	Chc	Lkly	Lkly	Lkly	Lkly	Lkly	Lkly	Chc
Thunder	Chc	Chc	SChc	SChc	SChc	Chc	Chc	Chc	SChc	SChc	SChc	--	--	--	--	--	--	SChc	SChc	SChc	SChc	SChc	SChc	SChc
Date				05/11
Hour (EDT)	21	22	23	00	01	02	03	04	05	06	07	08	09	10	11	12	13	14	15	16	17	18	19	20
Temperature (°F)	54	53	52	51	51	51	50	49	48	48	49	50	53	56	59	61	62	64	65	65	65	64	62	60
Dewpoint (°F)	49	49	48	48	47	47	47	46	46	46	47	47	46	46	46	46	45	46	46	46	46	47	48	49
Heat Index (°F)
Surface Wind (mph)	7	6	6	6	6	6	6	5	5	5	5	6	5	5	5	5	5	6	6	6	6	6	6	6
Wind Dir	NE	N	N	N	N	N	N	N	N	N	N	N	N	N	N	NW	NW	W	W	SW	S	S	S	SE
Gust
Sky Cover (%)	89	89	88	86	85	84	83	82	81	79	77	75	71	67	62	63	63	64	67	70	73	78	83	87
Precipitation Potential (%)	51	51	51	51	51	11	11	11	11	11	11	9	9	9	9	9	9	47	47	47	47	47	47	64
Relative Humidity (%)	83	86	86	89	86	86	89	89	93	93	93	89	77	69	62	58	54	52	50	50	50	54	60	67
Rain	Chc	Chc	Chc	Chc	Chc	--	--	--	--	--	--	--	--	--	--	--	--	Chc	Chc	Chc	Chc	Chc	Chc	Lkly
Thunder	SChc	SChc	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	SChc	SChc	SChc	SChc

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