IEM :: RASTER info for mrms

The IEM produces a number of RASTER images meant for GIS use. These RASTERs are typically provided on the IEM website as 8 bit PNG images. This means there are 256 slots available for a binned value to be placed. This page attempts to document these RASTER images and provide the lookup table of PNG index to an actual value. Click on the item in the "Label" column to get the lookup table below.

Label	Description	Units
composite_eet	This is a composite of 8bit Echo Tops (EET)	kft
composite_n0q	This is a composite of 8bit Reflectivity (N0Q)	dBZ
composite_n0r	This is a composite of Reflectivity (N0R)	dBZ
mrms_a2m	NCEP MRMS 2 minute interval precipitation accumulation.	mm
mrms_lcref	NCEP MRMS 2 minute lowest elevation composite reflectivity.	dBZ
mrms_p1h	NCEP MRMS 1 Hour Accumulated Precipitation.	mm
mrms_p24h	NCEP MRMS 24 Hour Accumulated Precipitation.	mm
mrms_p48h	NCEP MRMS 48 Hour Accumulated Precipitation	mm
mrms_p72h	NCEP MRMS 72 Hour Accumulated Precipitation.	mm

Programatic Access to this RASTER source

The IEM generated RASTERs are stored in a programatic way that should allow for easy scripted download of the archive. This section documents the URL format template used with the time shown in UTC. The string format modifiers below are pythonic strftime values.

https://mesonet.agron.iastate.edu/archive/data/%Y/%m/%d/GIS/mrms/lcref_%Y%m%d%H%M.png

A general web service also exists to convert these RASTERs to netCDF "on-the-fly". The URL format is like so:

https://mesonet.agron.iastate.edu/cgi-bin/request/raster2netcdf.py?dstr=%Y%m%d%H%M&prod=mrms_lcref

Try the netCDF Conversion!

Lookup Table for mrms_lcref

Would it help you to have the information below in a different format? Please contact us if so!

Color Index	Value (dBZ)	Red	Green	Blue	HEX
0	-32	0	0	0	#000000
1	-31.5	0	0	0	#000000
2	-31	0	0	0	#000000
3	-30.5	0	0	0	#000000
4	-30	0	0	0	#000000
5	-29.5	0	0	0	#000000
6	-29	0	0	0	#000000
7	-28.5	0	0	0	#000000
8	-28	0	0	0	#000000
9	-27.5	0	0	0	#000000
10	-27	0	0	0	#000000
11	-26.5	0	0	0	#000000
12	-26	0	0	0	#000000
13	-25.5	0	0	0	#000000
14	-25	0	0	0	#000000
15	-24.5	0	0	0	#000000
16	-24	0	0	0	#000000
17	-23.5	0	0	0	#000000
18	-23	0	0	0	#000000
19	-22.5	0	0	0	#000000
20	-22	0	0	0	#000000
21	-21.5	0	0	0	#000000
22	-21	0	0	0	#000000
23	-20.5	0	0	0	#000000
24	-20	0	0	0	#000000
25	-19.5	0	0	0	#000000
26	-19	0	0	0	#000000
27	-18.5	0	0	0	#000000
28	-18	0	0	0	#000000
29	-17.5	0	0	0	#000000
30	-17	0	0	0	#000000
31	-16.5	0	0	0	#000000
32	-16	0	0	0	#000000
33	-15.5	0	0	0	#000000
34	-15	0	0	0	#000000
35	-14.5	0	0	0	#000000
36	-14	0	0	0	#000000
37	-13.5	0	0	0	#000000
38	-13	0	0	0	#000000
39	-12.5	0	0	0	#000000
40	-12	0	0	0	#000000
41	-11.5	0	0	0	#000000
42	-11	0	0	0	#000000
43	-10.5	0	0	0	#000000
44	-10	0	0	0	#000000
45	-9.5	0	0	0	#000000
46	-9	0	0	0	#000000
47	-8.5	0	0	0	#000000
48	-8	0	0	0	#000000
49	-7.5	0	0	0	#000000
50	-7	0	0	0	#000000
51	-6.5	0	0	0	#000000
52	-6	0	0	0	#000000
53	-5.5	0	0	0	#000000
54	-5	0	0	0	#000000
55	-4.5	0	0	0	#000000
56	-4	0	0	0	#000000
57	-3.5	0	0	0	#000000
58	-3	0	0	0	#000000
59	-2.5	0	0	0	#000000
60	-2	0	0	0	#000000
61	-1.5	0	0	0	#000000
62	-1	0	0	0	#000000
63	-0.5	0	0	0	#000000
64	0	0	0	0	#000000
65	0.5	0	0	0	#000000
66	1	0	0	0	#000000
67	1.5	0	0	0	#000000
68	2	0	0	0	#000000
69	2.5	0	0	0	#000000
70	3	0	0	0	#000000
71	3.5	0	0	0	#000000
72	4	0	0	0	#000000
73	4.5	0	0	0	#000000
74	5	0	0	0	#000000
75	5.5	0	0	0	#000000
76	6	0	0	0	#000000
77	6.5	0	0	0	#000000
78	7	0	0	0	#000000
79	7.5	0	0	0	#000000
80	8	0	0	0	#000000
81	8.5	0	0	0	#000000
82	9	0	0	0	#000000
83	9.5	0	0	0	#000000
84	10	0	0	0	#000000
85	10.5	0	0	0	#000000
86	11	164	164	255	#a4a4ff
87	11.5	161	161	252	#a1a1fc
88	12	158	158	249	#9e9ef9
89	12.5	154	154	246	#9a9af6
90	13	151	151	242	#9797f2
91	13.5	148	148	239	#9494ef
92	14	145	145	236	#9191ec
93	14.5	142	142	233	#8e8ee9
94	15	138	138	230	#8a8ae6
95	15.5	135	135	227	#8787e3
96	16	132	132	224	#8484e0
97	16.5	129	129	220	#8181dc
98	17	126	126	217	#7e7ed9
99	17.5	122	122	214	#7a7ad6
100	18	119	119	211	#7777d3
101	18.5	116	116	208	#7474d0
102	19	113	113	205	#7171cd
103	19.5	110	110	201	#6e6ec9
104	20	106	106	198	#6a6ac6
105	20.5	103	103	195	#6767c3
106	21	64	128	255	#4080ff
107	21.5	62	125	249	#3e7df9
108	22	61	122	242	#3d7af2
109	22.5	59	118	236	#3b76ec
110	23	58	115	230	#3a73e6
111	23.5	56	112	223	#3870df
112	24	54	109	217	#366dd9
113	24.5	53	106	211	#356ad3
114	25	51	102	204	#3366cc
115	25.5	50	99	198	#3263c6
116	26	48	96	192	#3060c0
117	26.5	46	93	185	#2e5db9
118	27	45	90	179	#2d5ab3
119	27.5	43	86	172	#2b56ac
120	28	42	83	166	#2a53a6
121	28.5	40	80	160	#2850a0
122	29	38	77	153	#264d99
123	29.5	37	74	147	#254a93
124	30	35	70	141	#23468d
125	30.5	34	67	134	#224386
126	31	32	64	128	#204080
127	31.5	0	249	0	#00f900
128	32	0	242	0	#00f200
129	32.5	0	236	0	#00ec00
130	33	0	230	0	#00e600
131	33.5	0	223	0	#00df00
132	34	0	217	0	#00d900
133	34.5	0	211	0	#00d300
134	35	0	204	0	#00cc00
135	35.5	0	198	0	#00c600
136	36	0	192	0	#00c000
137	36.5	0	185	0	#00b900
138	37	0	179	0	#00b300
139	37.5	0	172	0	#00ac00
140	38	0	166	0	#00a600
141	38.5	0	160	0	#00a000
142	39	0	153	0	#009900
143	39.5	0	147	0	#009300
144	40	0	141	0	#008d00
145	40.5	0	134	0	#008600
146	41	0	128	0	#008000
147	41.5	255	249	0	#fff900
148	42	255	242	0	#fff200
149	42.5	255	236	0	#ffec00
150	43	255	230	0	#ffe600
151	43.5	255	223	0	#ffdf00
152	44	255	217	0	#ffd900
153	44.5	255	211	0	#ffd300
154	45	255	204	0	#ffcc00
155	45.5	255	198	0	#ffc600
156	46	255	192	0	#ffc000
157	46.5	255	185	0	#ffb900
158	47	255	179	0	#ffb300
159	47.5	255	172	0	#ffac00
160	48	255	166	0	#ffa600
161	48.5	255	160	0	#ffa000
162	49	255	153	0	#ff9900
163	49.5	255	147	0	#ff9300
164	50	255	141	0	#ff8d00
165	50.5	255	134	0	#ff8600
166	51	255	0	0	#ff0000
167	51.5	250	0	0	#fa0000
168	52	245	0	0	#f50000
169	52.5	241	0	0	#f10000
170	53	236	0	0	#ec0000
171	53.5	231	0	0	#e70000
172	54	227	0	0	#e30000
173	54.5	222	0	0	#de0000
174	55	217	0	0	#d90000
175	55.5	212	0	0	#d40000
176	56	207	0	0	#cf0000
177	56.5	203	0	0	#cb0000
178	57	198	0	0	#c60000
179	57.5	193	0	0	#c10000
180	58	189	0	0	#bd0000
181	58.5	184	0	0	#b80000
182	59	179	0	0	#b30000
183	59.5	174	0	0	#ae0000
184	60	170	0	0	#aa0000
185	60.5	165	0	0	#a50000
186	61	255	0	255	#ff00ff
187	61.5	249	0	249	#f900f9
188	62	242	0	242	#f200f2
189	62.5	236	0	236	#ec00ec
190	63	230	0	230	#e600e6
191	63.5	223	0	223	#df00df
192	64	217	0	217	#d900d9
193	64.5	211	0	211	#d300d3
194	65	204	0	204	#cc00cc
195	65.5	198	0	198	#c600c6
196	66	192	0	192	#c000c0
197	66.5	185	0	185	#b900b9
198	67	179	0	179	#b300b3
199	67.5	172	0	172	#ac00ac
200	68	166	0	166	#a600a6
201	68.5	160	0	160	#a000a0
202	69	153	0	153	#990099
203	69.5	147	0	147	#930093
204	70	141	0	141	#8d008d
205	70.5	134	0	134	#860086
206	71	255	255	255	#ffffff
207	71.5	249	249	249	#f9f9f9
208	72	242	242	242	#f2f2f2
209	72.5	236	236	236	#ececec
210	73	230	230	230	#e6e6e6
211	73.5	223	223	223	#dfdfdf
212	74	217	217	217	#d9d9d9
213	74.5	211	211	211	#d3d3d3
214	75	204	204	204	#cccccc
215	75.5	198	198	198	#c6c6c6
216	76	192	192	192	#c0c0c0
217	76.5	185	185	185	#b9b9b9
218	77	179	179	179	#b3b3b3
219	77.5	172	172	172	#acacac
220	78	166	166	166	#a6a6a6
221	78.5	160	160	160	#a0a0a0
222	79	153	153	153	#999999
223	79.5	147	147	147	#939393
224	80	141	141	141	#8d8d8d
225	80.5	134	134	134	#868686
226	81	128	128	128	#808080
227	81.5	128	128	128	#808080
228	82	128	128	128	#808080
229	82.5	128	128	128	#808080
230	83	128	128	128	#808080
231	83.5	128	128	128	#808080
232	84	128	128	128	#808080
233	84.5	128	128	128	#808080
234	85	128	128	128	#808080
235	85.5	128	128	128	#808080
236	86	128	128	128	#808080
237	86.5	128	128	128	#808080
238	87	128	128	128	#808080
239	87.5	128	128	128	#808080
240	88	128	128	128	#808080
241	88.5	128	128	128	#808080
242	89	128	128	128	#808080
243	89.5	128	128	128	#808080
244	90	128	128	128	#808080
245	90.5	128	128	128	#808080
246	91	128	128	128	#808080
247	91.5	128	128	128	#808080
248	92	128	128	128	#808080
249	92.5	128	128	128	#808080
250	93	128	128	128	#808080
251	93.5	128	128	128	#808080
252	94	128	128	128	#808080
253	94.5	128	128	128	#808080
254	95	128	128	128	#808080
255	Missing	128	128	128	#808080