Point Forecast: 3 Miles SSE Merna IL  40.5N 88.84W (Elev. 833 ft)	Last Update: 4:41 pm CDT May 18, 2024

[hide menu]

Weather Elements Fire Weather Probabilistic Forecasts (Experimental) Description | Survey 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 Trans. Wind  ktmphkm/hm/s 20ft Wind  ktmphkm/hm/s Vent Rate (x1000 mph-ft) Quantitative Precipitation  3-hr6-hr12-hr24-hr   info     0.100.250.501.00 Snowfall  3-hr6-hr12-hr24-hr   info     0.1in1in3in6in12in

48-Hour Period Starting: 5pm Sat, May 18 20246pm Sat, May 18 20247pm Sat, May 18 20248pm Sat, May 18 20249pm Sat, May 18 202410pm Sat, May 18 202411pm Sat, May 18 202412am Sun, May 19 20241am Sun, May 19 20242am Sun, May 19 20243am Sun, May 19 20244am Sun, May 19 20245am Sun, May 19 20246am Sun, May 19 20247am Sun, May 19 20248am Sun, May 19 20249am Sun, May 19 202410am Sun, May 19 202411am Sun, May 19 202412pm Sun, May 19 20241pm Sun, May 19 20242pm Sun, May 19 20243pm Sun, May 19 20244pm Sun, May 19 20245pm Sun, May 19 20246pm Sun, May 19 20247pm Sun, May 19 20248pm Sun, May 19 20249pm Sun, May 19 202410pm Sun, May 19 202411pm Sun, May 19 202412am Mon, May 20 20241am Mon, May 20 20242am Mon, May 20 20243am Mon, May 20 20244am Mon, May 20 20245am Mon, May 20 20246am Mon, May 20 20247am Mon, May 20 20248am Mon, May 20 20249am Mon, May 20 202410am Mon, May 20 202411am Mon, May 20 202412pm Mon, May 20 20241pm Mon, May 20 20242pm Mon, May 20 20243pm Mon, May 20 20244pm Mon, May 20 20245pm Mon, May 20 20246pm Mon, May 20 20247pm Mon, May 20 20248pm Mon, May 20 20249pm Mon, May 20 202410pm Mon, May 20 202411pm Mon, May 20 202412am Tue, May 21 20241am Tue, May 21 20242am Tue, May 21 20243am Tue, May 21 20244am Tue, May 21 20245am Tue, May 21 20246am Tue, May 21 20247am Tue, May 21 20248am Tue, May 21 20249am Tue, May 21 202410am Tue, May 21 202411am Tue, May 21 202412pm Tue, May 21 20241pm Tue, May 21 20242pm Tue, May 21 20243pm Tue, May 21 20244pm Tue, May 21 20245pm Tue, May 21 20246pm Tue, May 21 20247pm Tue, May 21 20248pm Tue, May 21 20249pm Tue, May 21 202410pm Tue, May 21 202411pm Tue, May 21 202412am Wed, May 22 20241am Wed, May 22 20242am Wed, May 22 20243am Wed, May 22 20244am Wed, May 22 20245am Wed, May 22 20246am Wed, May 22 20247am Wed, May 22 20248am Wed, May 22 20249am Wed, May 22 202410am Wed, May 22 202411am Wed, May 22 202412pm Wed, May 22 20241pm Wed, May 22 20242pm Wed, May 22 20243pm Wed, May 22 20244pm Wed, May 22 20245pm Wed, May 22 20246pm Wed, May 22 20247pm Wed, May 22 20248pm Wed, May 22 20249pm Wed, May 22 202410pm Wed, May 22 202411pm Wed, May 22 202412am Thu, May 23 20241am Thu, May 23 20242am Thu, May 23 20243am Thu, May 23 20244am Thu, May 23 2024

Date	05/18							05/19
Hour (CDT)	17	18	19	20	21	22	23	00	01	02	03	04	05	06	07	08	09	10	11	12	13	14	15	16
Temperature (°F)	84	83	82	79	74	72	70	69	67	67	66	65	64	66	67	70	73	76	79	83	85	86	86	86
Dewpoint (°F)	61	60	61	61	61	61	61	61	61	61	61	62	62	61	63	63	64	65	65	65	65	64	64	64
Heat Index (°F)	84	83	83	79														76	79	85	87	87	87	87
Surface Wind (mph)	7	7	7	5	5	5	5	5	6	6	6	6	6	6	6	5	5	6	6	5	5	6	6	6
Wind Dir	SSW	SW	SW	SW	SW	SSW	SSW	SSW	SSW	SSW	SW	SW	WSW	WSW	WNW	N	NNE	NE	NE	E	SE	WSW	WSW	W
Gust
Sky Cover (%)	29	30	24	21	14	10	11	15	20	27	29	25	34	41	35	28	21	18	16	15	25	39	40	40
Precipitation Potential (%)	4	4	3	3	3	4	4	4	4	5	5	6	9	8	2	2	2	3	3	3	16	16	16	23
Relative Humidity (%)	46	46	49	55	64	68	73	76	81	81	84	90	93	84	87	78	73	69	62	55	51	48	48	48
Rain	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	SChc	SChc	SChc	SChc
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	SChc	SChc	SChc	SChc
Date								05/20
Hour (CDT)	17	18	19	20	21	22	23	00	01	02	03	04	05	06	07	08	09	10	11	12	13	14	15	16
Temperature (°F)	87	85	83	79	75	73	71	70	68	67	66	66	67	67	68	72	75	79	81	82	83	84	84	84
Dewpoint (°F)	63	64	64	63	64	63	61	61	61	60	60	61	61	62	63	64	65	65	65	64	64	64	63	63
Heat Index (°F)	88	86	84	79	75												75	79	83	83	84	85	85	85
Surface Wind (mph)	6	6	6	6	6	7	8	8	8	8	9	9	9	10	10	11	14	15	16	17	18	18	18	17
Wind Dir	WNW	NE	ESE	S	S	SE	ESE	SE	SSE	SSE	S	S	S	S	S	S	SSW	SSW	SSW	S	S	S	SSW	SSW
Gust											15	15	15	15	16	17	20	21	22	23	23	23	22	21
Sky Cover (%)	42	41	41	45	44	53	36	28	29	29	28	27	28	31	34	37	41	44	48	52	56	56	55	55
Precipitation Potential (%)	23	23	15	15	15	9	9	9	2	2	2	2	2	2	10	10	10	10	10	10	30	30	30	30
Relative Humidity (%)	45	50	53	58	69	71	71	73	78	78	81	84	81	84	84	76	71	62	58	55	53	51	49	49
Rain	SChc	SChc	SChc	SChc	SChc	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	Chc	Chc	Chc	Chc
Thunder	SChc	SChc	SChc	SChc	SChc	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	SChc	SChc	SChc	Chc

International System of Units Forecast Discussion 7-Day Forecast Hourly Weather Graph Hazardous Weather Cooperative Observers Observed Temps/Pcpn River Info (AHPS) Local Climate NOAA Weather Radio Home