USAP Siple Dome (SDM) site lat/lon = (-81.6640,-149.0175) cell lat/lon = (-81.6600,-148.9887) Forecast initialized at 2025-09-21/00 UTC MPAS cell scale: 2.3 km FCST UTC UTC T Td Altim Spd Gust Dir Grid VVV RH1RH2RH3 T1T2T3 ACCUM HR DAY HR (C) (C) (in Hg)(kts)(kts)(deg)(deg) (*) (% wrt water) (C) (*) 0 21 00 -17.9 -20.1 28.76 1 2 317 168 000 98 99 99 -18-18-18 000 1 21 01 -19.4 -21.3 28.76 4 4 309 160 -001 103102102 -18-19-19 007 2 21 02 -20.9 -22.2 28.76 5 6 308 159 000 111105101 -19-19-19 004 3 21 03 -23.2 -23.9 28.78 6 7 305 156 000 123103106 -20-19-19 003 4 21 04 -25.0 -25.8 28.78 6 7 315 166 000 126105109 -20-20-20 003 5 21 05 -25.6 -26.7 28.78 8 11 324 175 001 121107107 -20-20-20 003 6 21 06 -25.6 -27.1 28.82 8 13 330 181 000 115103105 -21-20-20 004 7 21 07 -26.6 -27.7 28.81 9 13 332 183 -001 121101105 -21-20-20 002 8 21 08 -27.6 -28.2 28.80 9 14 341 192 000 129100105 -21-20-20 001 9 21 09 -28.3 -28.9 28.82 10 14 348 199 000 131 99105 -21-20-21 000 10 21 10 -29.0 -29.6 28.81 10 15 353 204 000 132 99109 -22-21-21 000 11 21 11 -29.6 -30.3 28.84 10 14 356 207 000 133 99113 -22-20-21 000 12 21 12 -29.8 -30.5 28.84 9 13 359 210 000 133 99116 -22-21-21 001 13 21 13 -29.8 -30.7 28.84 9 13 3 214 000 129100116 -22-21-22 001 14 21 14 -30.0 -31.0 28.86 9 13 8 219 000 126101114 -22-21-22 002 15 21 15 -30.5 -31.7 28.86 9 13 12 223 000 125101112 -22-21-22 001 16 21 16 -31.0 -32.2 28.87 9 12 14 225 000 125101111 -22-22-22 001 17 21 17 -30.8 -32.1 28.87 9 12 13 224 000 124100107 -22-22-22 000 18 21 18 -30.7 -32.0 28.87 8 11 11 222 000 124 99103 -23-22-23 001 19 21 19 -30.4 -31.8 28.87 8 11 10 221 002 124100100 -23-22-23 000 20 21 20 -30.4 -31.9 28.87 7 10 11 222 002 123102 96 -23-23-23 000 21 21 21 -30.5 -32.0 28.87 7 9 13 224 005 122104 94 -23-23-23 000 22 21 22 -30.5 -31.9 28.86 6 7 17 228 003 122107 94 -23-24-24 000 23 21 23 -29.9 -30.8 28.86 5 5 25 236 001 124109 96 -24-24-23 000 24 22 00 -30.1 -31.0 28.86 6 6 34 245 006 126106100 -24-24-23 000 25 22 01 -30.5 -31.2 28.86 7 8 37 248 004 129102104 -23-23-23 000 26 22 02 -30.8 -31.3 28.84 7 8 41 252 000 132 98105 -23-23-23 000 27 22 03 -31.1 -31.6 28.83 8 9 46 257 -001 133 97104 -23-23-22 000 28 22 04 -31.2 -31.8 28.81 8 10 54 265 -003 133 94101 -23-22-22 000 29 22 05 -31.1 -31.7 28.80 8 10 61 272 -002 133 92101 -22-22-22 000 30 22 06 -30.9 -31.5 28.80 9 11 67 279 -001 132 92100 -22-22-22 000 31 22 07 -30.7 -31.3 28.79 9 12 75 286 000 132 93 98 -22-22-22 000 32 22 08 -30.4 -31.0 28.77 9 13 82 293 000 132 95 95 -22-22-22 000 33 22 09 -30.1 -30.7 28.74 9 15 89 300 000 132 95 98 -22-22-22 000 34 22 10 -29.9 -30.5 28.72 9 16 93 304 000 132 93 98 -21-22-22 000 35 22 11 -29.7 -30.3 28.71 10 16 93 304 000 132 89 95 -21-21-22 000 36 22 12 -29.6 -30.2 28.70 9 15 93 304 000 131 86 92 -21-21-21 000 37 22 13 -29.6 -30.2 28.68 9 14 94 305 000 131 87 89 -21-21-21 000 38 22 14 -29.7 -30.3 28.66 9 13 93 304 000 131 88 86 -21-21-21 000 39 22 15 -29.5 -30.1 28.64 9 13 94 305 000 131 87 83 -21-21-21 000 40 22 16 -29.3 -29.9 28.62 9 14 95 307 001 131 79 80 -20-21-21 000 41 22 17 -29.4 -30.0 28.61 9 13 95 306 000 131 81 78 -20-20-21 000 42 22 18 -29.2 -29.8 28.59 9 12 87 298 000 130 82 77 -20-20-21 000 43 22 19 -28.6 -29.2 28.58 9 12 82 293 000 129 75 75 -20-20-20 000 44 22 20 -28.2 -29.4 28.55 9 12 77 288 000 119 48 63 -20-20-20 000 45 22 21 -28.0 -29.7 28.53 9 12 73 284 000 111 30 51 -19-20-20 000 46 22 22 -27.6 -30.0 28.52 8 10 71 282 000 101 33 47 -19-20-20 000 47 22 23 -27.1 -30.4 28.51 7 8 72 283 000 90 39 51 -19-20-20 000 48 23 00 -26.6 -30.8 28.50 6 7 76 287 000 81 44 52 -19-20-20 000 49 23 01 -26.7 -31.6 28.48 6 8 92 303 000 75 46 49 -19-20-20 000 50 23 02 -27.1 -32.1 28.46 7 8 99 310 000 73 45 46 -19-19-20 000 51 23 03 -26.7 -32.2 28.45 6 9 104 315 001 69 46 45 -19-19-20 000 52 23 04 -27.0 -31.5 28.44 7 10 112 323 000 76 44 44 -19-19-20 000 53 23 05 -26.9 -31.4 28.43 6 10 117 328 000 78 43 44 -19-19-20 000 54 23 06 -26.1 -30.8 28.42 6 9 120 331 000 77 43 42 -19-19-20 000 55 23 07 -25.6 -30.5 28.40 5 8 115 326 -001 77 42 41 -18-19-20 000 56 23 08 -25.3 -30.0 28.39 4 7 115 326 000 78 42 39 -18-19-20 000 57 23 09 -25.3 -29.8 28.38 4 6 99 310 001 78 40 40 -18-19-19 000 58 23 10 -25.3 -29.8 28.38 3 5 95 306 000 79 40 40 -18-19-19 000 59 23 11 -26.2 -29.7 28.37 3 3 68 280 000 87 41 44 -19-19-19 000 60 23 12 -25.2 -28.9 28.37 4 4 9 220 -001 85 43 54 -19-19-19 000 61 23 13 -24.6 -29.4 28.37 4 4 350 201 001 76 47 51 -19-19-19 000 62 23 14 -24.6 -30.1 28.37 4 4 335 186 000 71 48 42 -19-19-19 000 63 23 15 -24.6 -30.6 28.36 4 4 341 192 000 68 48 37 -18-18-19 000 64 23 16 -24.8 -30.9 28.36 5 5 348 199 000 67 46 47 -18-19-19 000 65 23 17 -25.7 -31.4 28.37 6 7 346 197 001 69 40 58 -18-19-19 000 66 23 18 -26.2 -31.7 28.38 6 8 354 205 001 69 36 49 -18-18-19 000 67 23 19 -25.1 -31.4 28.39 6 7 358 209 000 66 37 60 -18-18-19 000 68 23 20 -24.9 -31.4 28.40 6 8 10 221 000 63 46 66 -18-18-18 000 69 23 21 -25.3 -31.5 28.40 7 8 22 233 000 63 51 69 -18-18-18 000 70 23 22 -25.8 -31.2 28.41 7 9 33 244 000 68 55 71 -17-18-18 000 71 23 23 -25.6 -30.6 28.43 7 9 42 253 002 71 57 69 -17-17-18 000 72 24 00 -25.2 -28.7 28.45 7 9 46 257 001 86 62 68 -17-17-18 000 73 24 01 -25.0 -27.4 28.46 7 8 52 263 002 96 63 70 -17-17-18 000 74 24 02 -25.2 -27.3 28.47 7 9 60 271 002 100 65 72 -17-17-18 000 75 24 03 -25.2 -27.4 28.48 8 9 64 275 001 98 64 72 -17-17-17 000 76 24 04 -24.8 -27.3 28.49 7 8 66 277 001 95 61 72 -17-17-17 000 77 24 05 -24.6 -27.2 28.50 8 9 66 277 001 94 59 72 -16-16-17 000 78 24 06 -24.1 -26.9 28.52 8 9 64 275 002 91 60 66 -16-16-17 000 79 24 07 -23.7 -26.8 28.53 8 9 63 274 000 89 65 64 -16-16-17 000 80 24 08 -23.6 -26.7 28.54 8 10 60 271 000 87 68 68 -15-16-17 000 81 24 09 -23.6 -26.9 28.56 8 9 56 268 000 86 69 86 -15-16-16 000 82 24 10 -23.3 -26.7 28.57 8 8 55 266 000 84 72 92 -15-15-16 000 83 24 11 -23.0 -26.4 28.58 7 8 53 264 000 85 74 91 -14-15-16 000 84 24 12 -22.4 -26.0 28.61 7 7 48 259 002 83 75 93 -14-15-16 000 85 24 13 -21.4 -25.4 28.63 6 6 46 257 000 80 77 98 -14-15-16 000 86 24 14 -20.0 -24.6 28.64 5 5 43 255 000 76 81 99 -14-15-15 000 87 24 15 -19.4 -24.2 28.65 4 4 44 255 000 75 84 95 -14-14-15 000 88 24 16 -19.1 -23.7 28.66 4 4 40 251 000 76 85 93 -14-14-15 000 89 24 17 -18.4 -23.4 28.68 3 3 33 244 000 73 86 88 -13-14-15 000 90 24 18 -17.5 -22.8 28.69 2 2 41 252 000 71 86 75 -13-14-15 000 91 24 19 -17.4 -22.0 28.70 0 2 42 253 002 75 86 65 -14-14-15 000 92 24 20 -17.9 -22.8 28.72 3 6 112 323 000 74 85 67 -14-14-15 000 93 24 21 -17.8 -23.3 28.73 4 4 106 317 000 70 85 68 -13-14-15 000 94 24 22 -17.4 -22.8 28.74 2 4 117 328 000 70 84 69 -13-14-15 000 95 24 23 -17.3 -22.6 28.75 2 5 141 352 000 70 82 70 -13-14-15 000 96 25 00 -17.5 -22.5 28.76 2 5 159 10 000 72 81 70 -13-14-15 000 97 25 01 -17.7 -22.5 28.76 2 6 194 45 000 75 76 68 -13-14-14 000 98 25 02 -18.2 -22.6 28.77 3 8 196 47 000 78 72 66 -13-14-14 000 99 25 03 -18.3 -23.0 28.77 4 9 191 42 000 76 62 67 -13-14-14 000 100 25 04 -18.9 -23.9 28.76 5 9 196 47 000 72 54 82 -13-13-14 000 101 25 05 -19.5 -24.4 28.76 6 10 196 48 000 71 51 89 -13-13-14 000 102 25 06 -20.2 -24.9 28.76 6 11 202 53 000 73 60 88 -13-13-14 000 103 25 07 -20.6 -25.1 28.76 7 12 207 58 000 73 67 83 -14-13-14 000 104 25 08 -21.4 -25.4 28.76 8 14 206 57 000 78 71 75 -14-13-14 000 105 25 09 -22.3 -25.4 28.75 8 14 208 59 -001 87 69 80 -14-13-14 000 106 25 10 -22.6 -25.3 28.74 8 14 214 65 -001 92 71 81 -13-13-14 000 107 25 11 -23.2 -25.2 28.74 8 15 220 71 -003 101 72 83 -13-13-14 000 108 25 12 -23.5 -24.9 28.74 8 15 221 72 -004 109 75 82 -13-13-14 000 109 25 13 -23.6 -24.7 28.73 9 15 227 78 -003 113 76 80 -13-13-14 000 110 25 14 -23.6 -24.5 28.72 9 16 232 83 -001 116 75 78 -13-13-14 000 111 25 15 -24.3 -24.7 28.71 9 16 231 82 -001 123 75 69 -14-14-14 000 112 25 16 -24.2 -24.8 28.69 10 16 235 86 -001 124 77 69 -14-14-14 000 113 25 17 -24.2 -24.8 28.68 9 15 240 91 -001 125 73 63 -14-14-14 000 114 25 18 -23.9 -24.5 28.67 9 15 241 92 -001 124 64 63 -15-14-14 000 115 25 19 -24.1 -24.7 28.66 8 15 237 88 -003 125 58 62 -15-14-14 000 116 25 20 -24.5 -25.2 28.65 7 12 240 91 -005 125 62 59 -15-14-14 000 117 25 21 -24.6 -25.3 28.64 7 11 246 97 -004 125 50 34 -15-14-15 000 118 25 22 -24.3 -25.0 28.63 7 10 248 99 -002 124 44 53 -15-14-15 000 119 25 23 -24.2 -24.8 28.62 6 9 241 92 -001 124 48 47 -15-14-15 000 120 26 00 -24.9 -25.6 28.62 6 9 243 94 000 126 39 49 -15-14-15 000 * NOTES on units: VVV (vertical velocity) is given as tenths of a microbar per second at 700 hPa, with positive values indicating upward motion; ACCUM (accumulated precipitation, past 3h) is given as hundredths of a millimeter; RH1, RH2, and RH3 are the % RH at the surface, 1000', and 3000', respectively; T1, T2, and T3 are the temperatures at 500', 1000', and 1500', respectively. Gust is estimated according to the NCEP HRRR gust algorithm.