USAP Siple Dome (SDM) site lat/lon = (-81.6640,-149.0175) cell lat/lon = (-81.6600,-148.9887) Forecast initialized at 2025-09-27/12 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 27 12 -29.7 -34.7 28.57 6 7 24 235 -001 71 52 44 -22-19-18 000 1 27 13 -31.8 -34.2 28.60 9 11 23 234 -002 105 50 44 -21-19-18 000 2 27 14 -31.5 -33.5 28.59 10 13 23 234 001 109 52 47 -21-19-18 000 3 27 15 -30.9 -32.2 28.61 11 15 24 235 000 122 50 50 -21-18-17 000 4 27 16 -31.1 -32.2 28.63 11 16 23 234 000 126 50 53 -21-19-17 000 5 27 17 -31.1 -32.1 28.65 11 16 24 235 000 128 51 54 -21-19-17 000 6 27 18 -30.7 -31.6 28.66 11 16 25 236 -003 129 55 53 -21-18-17 000 7 27 19 -30.2 -31.1 28.66 11 16 27 238 -006 129 61 53 -21-19-17 000 8 27 20 -29.6 -30.6 28.68 11 16 28 239 -009 127 65 54 -22-19-18 000 9 27 21 -29.3 -30.4 28.70 10 15 30 241 -010 126 70 54 -22-19-18 000 10 27 22 -29.3 -30.3 28.71 9 13 33 244 -011 126 74 54 -22-20-18 000 11 27 23 -29.1 -30.2 28.73 9 12 41 252 -008 124 73 53 -22-19-18 000 12 28 00 -29.3 -30.5 28.73 8 10 46 257 -008 123 69 54 -21-20-18 000 13 28 01 -28.9 -30.2 28.76 8 10 57 268 -006 120 60 52 -21-19-18 000 14 28 02 -28.5 -30.2 28.77 8 10 60 271 -005 112 63 50 -20-19-18 000 15 28 03 -28.3 -30.2 28.78 9 12 63 274 -004 108 61 49 -20-19-18 000 16 28 04 -28.3 -30.5 28.78 10 13 68 279 -002 103 57 49 -19-18-17 000 17 28 05 -28.3 -31.2 28.78 10 14 65 276 000 95 59 50 -18-17-17 000 18 28 06 -28.2 -31.5 28.79 10 13 66 277 000 90 56 50 -18-17-16 000 19 28 07 -28.0 -31.3 28.78 10 13 67 278 000 90 53 50 -17-17-16 000 20 28 08 -27.6 -30.7 28.78 10 13 66 277 000 90 51 50 -17-16-16 000 21 28 09 -26.9 -29.8 28.78 9 12 69 280 001 92 47 50 -17-16-15 000 22 28 10 -26.1 -28.8 28.77 8 10 76 287 001 92 44 51 -16-15-15 000 23 28 11 -25.4 -28.5 28.77 9 11 87 298 003 87 48 52 -15-15-16 000 24 28 12 -25.1 -28.7 28.77 8 12 111 322 001 82 47 46 -15-15-15 000 25 28 13 -25.5 -28.9 28.77 9 15 123 334 000 85 51 45 -15-14-14 000 26 28 14 -25.6 -29.0 28.76 10 15 135 346 000 85 49 42 -14-13-14 000 27 28 15 -25.7 -29.1 28.75 9 16 144 355 000 86 44 40 -14-13-13 000 28 28 16 -25.6 -28.5 28.73 9 16 155 6 000 92 39 41 -14-13-13 000 29 28 17 -24.6 -27.3 28.73 9 17 161 12 001 96 31 31 -15-13-13 000 30 28 18 -24.2 -26.8 28.73 8 16 181 32 -001 98 33 31 -14-13-13 000 31 28 19 -23.8 -26.4 28.73 8 14 191 42 000 98 39 85 -15-13-13 000 32 28 20 -23.9 -26.8 28.72 7 13 186 37 001 93 47 93 -15-14-13 000 33 28 21 -24.0 -27.1 28.70 7 12 195 46 001 92 56100 -15-13-13 000 34 28 22 -23.6 -27.1 28.70 6 11 200 51 000 87 75 95 -14-13-13 000 35 28 23 -22.4 -26.8 28.71 4 9 202 53 001 79 75 89 -14-14-13 000 36 29 00 -21.3 -26.8 28.71 3 7 208 59 001 72 72 83 -14-14-14 000 37 29 01 -20.5 -26.7 28.72 1 5 208 59 001 67 73 77 -14-14-14 000 38 29 02 -20.0 -26.1 28.72 1 2 44 255 000 67 77 78 -14-14-13 000 39 29 03 -21.4 -26.3 28.71 5 5 294 145 000 75 75 72 -14-13-13 000 40 29 04 -22.1 -27.3 28.72 5 6 272 123 001 72 72 72 -14-13-13 000 41 29 05 -22.1 -27.6 28.72 5 6 264 115 -001 71 72 69 -14-13-14 000 42 29 06 -22.3 -28.1 28.72 5 7 256 107 -001 68 68 67 -14-13-13 000 43 29 07 -22.2 -28.2 28.72 5 7 240 91 000 69 64 63 -14-13-12 000 44 29 08 -22.3 -28.0 28.72 4 8 193 44 -001 70 60 58 -14-13-12 000 45 29 09 -22.3 -28.3 28.72 4 7 177 28 000 68 57 49 -14-13-12 000 46 29 10 -23.1 -28.5 28.73 5 9 140 351 000 67 56 48 -14-13-11 000 47 29 11 -23.8 -27.7 28.73 7 12 118 329 000 82 54 65 -14-12-11 000 48 29 12 -23.4 -25.3 28.73 8 15 96 307 000 106 49 56 -14-12-11 000 49 29 13 -23.0 -24.9 28.73 11 17 68 279 000 104 44 48 -13-12-11 000 50 29 14 -23.6 -24.1 28.74 9 14 72 283 -001 123 48 44 -14-13-11 000 51 29 15 -24.4 -24.9 28.74 10 17 65 276 -002 125 45 39 -16-12-10 000 52 29 16 -24.6 -25.1 28.74 13 23 56 267 -005 126 49 35 -15-10 -9 000 53 29 17 -26.2 -26.7 28.74 15 25 53 264 -007 128 46 35 -14 -9 -8 000 54 29 18 -27.1 -28.0 28.74 17 26 51 262 -003 123 45 37 -14 -9 -9 000 55 29 19 -26.1 -27.3 28.75 16 25 51 262 003 119 44 32 -14 -9 -9 000 56 29 20 -25.8 -27.2 28.76 15 25 51 262 000 115 41 30 -14 -9 -9 000 57 29 21 -25.4 -26.9 28.77 14 23 56 267 004 114 34 24 -12 -9-10 000 58 29 22 -23.8 -26.7 28.77 15 24 61 272 006 96 25 22 -11 -9 -9 000 59 29 23 -23.0 -25.7 28.78 15 23 67 278 003 98 33 41 -11 -9-10 000 60 30 00 -22.6 -25.1 28.77 14 25 65 276 003 99 39 45 -12-10-10 000 61 30 01 -22.1 -24.6 28.76 16 27 65 276 007 98 34 30 -11-10 -9 000 62 30 02 -21.4 -23.9 28.75 18 29 67 278 009 97 31 25 -11 -9 -8 000 63 30 03 -21.1 -23.7 28.75 17 31 66 277 010 96 32 43 -11 -8 -8 000 64 30 04 -19.3 -22.3 28.74 20 33 67 278 006 91 38 34 -14-10 -8 000 65 30 05 -19.0 -21.3 28.74 18 31 67 278 009 98 33 45 -12-10 -8 000 66 30 06 -18.6 -19.8 28.74 18 31 69 280 008 109 31 47 -13 -7 -8 000 67 30 07 -18.3 -20.3 28.73 17 30 73 284 001 100 39 35 -12 -8 -9 000 68 30 08 -19.0 -20.9 28.72 16 29 71 283 003 102 29 26 -11 -7 -7 000 69 30 09 -19.2 -21.4 28.71 17 27 71 282 000 99 27 29 -10 -7 -7 000 70 30 10 -20.0 -22.0 28.70 15 26 73 284 -008 102 32 42 -12 -8 -7 000 71 30 11 -20.9 -22.4 28.70 13 24 77 288 -006 108 37 34 -13 -9 -8 000 72 30 12 -21.6 -22.9 28.68 12 24 73 284 000 111 38 44 -13 -8 -7 000 73 30 13 -22.3 -23.4 28.67 13 27 70 281 -002 114 40 50 -11 -8 -8 000 74 30 14 -21.5 -23.5 28.66 17 27 69 280 004 103 46 57 -10 -8 -8 000 75 30 15 -21.9 -23.6 28.66 16 26 61 272 -001 108 39 45 -12 -9 -8 000 76 30 16 -22.5 -23.7 28.66 15 25 69 280 -001 114 45 53 -12 -9 -9 000 77 30 17 -22.0 -23.6 28.66 14 23 63 274 -005 109 43 46 -11 -8 -8 000 78 30 18 -21.3 -23.4 28.65 13 21 61 272 000 103 45 49 -10 -9 -9 000 79 30 19 -20.9 -23.3 28.64 13 21 56 267 000 98 45 45 -10 -9 -9 000 80 30 20 -20.3 -23.3 28.63 13 21 54 265 -004 92 41 45 -10 -7 -8 000 81 30 21 -20.4 -23.6 28.63 12 19 58 269 -004 89 40 44 -11 -7 -8 000 82 30 22 -21.3 -24.1 28.64 7 16 61 272 -006 94 44 49 -12 -8 -8 000 83 30 23 -21.4 -24.3 28.64 7 15 66 277 -004 92 49 53 -12-10 -9 000 84 01 00 -20.4 -24.1 28.64 9 16 68 279 003 83 50 54 -11-10-10 000 85 01 01 -20.4 -24.4 28.63 10 16 64 275 003 80 49 54 -11-10 -9 000 86 01 02 -21.4 -24.8 28.63 10 15 50 261 000 87 50 53 -11-10 -9 000 87 01 03 -22.4 -25.0 28.63 10 15 41 252 -001 97 51 51 -12-10-10 000 88 01 04 -23.3 -25.5 28.62 9 11 37 248 -003 101 49 54 -11-10-10 000 89 01 05 -23.6 -25.8 28.62 7 9 24 236 001 99 49 55 -13-11-10 000 90 01 06 -24.4 -26.1 28.62 7 9 8 219 -001 107 52 56 -14-12-10 000 91 01 07 -22.8 -24.7 28.62 4 5 348 199 001 103 53 56 -15-12-10 000 92 01 08 -25.0 -25.3 28.62 5 8 357 208 000 123 53 55 -17-11-11 000 93 01 09 -24.6 -24.7 28.62 5 5 355 206 000 125 56 55 -17-12-11 000 94 01 10 -25.9 -26.2 28.63 5 6 357 208 000 126 52 61 -17-12-11 000 95 01 11 -25.7 -26.0 28.63 6 6 4 215 -002 126 50 68 -16-12-11 000 96 01 12 -26.6 -27.1 28.64 6 8 358 209 000 127 48 63 -16-12-12 000 97 01 13 -27.0 -27.6 28.64 7 9 0 211 000 127 44 48 -14-12-12 000 98 01 14 -27.1 -27.8 28.64 8 11 353 204 000 128 84 38 -13-12-12 000 99 01 15 -27.2 -27.9 28.65 8 12 350 201 000 128 88 47 -13-12-12 000 100 01 16 -27.8 -28.6 28.65 7 11 328 179 -002 130 65 45 -13-12-12 000 101 01 17 -27.4 -28.1 28.66 6 9 331 182 -001 130 71 46 -15-12-12 000 102 01 18 -27.8 -28.5 28.67 5 9 314 165 000 131 70 40 -16-12-12 000 103 01 19 -28.4 -29.4 28.68 5 9 291 142 -001 131 68 39 -17-13-12 000 104 01 20 -26.8 -27.4 28.69 5 10 286 137 -001 129 70 45 -18-13-12 000 105 01 21 -25.4 -25.8 28.70 5 9 289 140 000 128 75 48 -18-14-12 000 106 01 22 -24.1 -24.5 28.71 7 10 306 157 001 126 79 47 -18-14-12 000 107 01 23 -23.5 -23.9 28.72 8 11 327 178 001 125 90 48 -19-15-13 000 108 02 00 -22.9 -23.3 28.73 8 15 334 185 000 125 96 55 -21-16-13 000 109 02 01 -21.5 -21.9 28.73 10 16 340 191 000 123 98 60 -21-15-13 000 110 02 02 -21.6 -22.5 28.73 12 17 348 199 000 118 98 57 -21-15-13 000 111 02 03 -22.2 -22.9 28.73 14 18 351 202 000 119107 61 -21-16-13 000 112 02 04 -22.5 -22.9 28.74 13 18 355 206 000 124 99 62 -22-15-14 000 113 02 05 -22.4 -22.8 28.75 14 19 353 204 -001 124 96 60 -22-15-14 000 114 02 06 -22.5 -22.9 28.76 13 20 355 206 -001 124 92 55 -22-16-14 000 115 02 07 -22.7 -23.6 28.77 14 20 359 210 000 118 82 59 -21-15-14 000 116 02 08 -22.9 -23.8 28.77 13 21 1 212 -001 118 77 61 -21-15-14 000 117 02 09 -22.9 -23.8 28.79 13 21 1 212 000 120 88 58 -21-15-14 000 118 02 10 -23.3 -24.1 28.80 12 19 3 214 000 120118 62 -21-18-15 000 119 02 11 -23.7 -24.4 28.82 11 17 3 214 000 122121 65 -22-20-16 000 120 02 12 -24.6 -25.1 28.82 10 16 5 216 000 126120 60 -22-20-17 000 * 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.