USAP Siple Dome (SDM) site lat/lon = (-81.6640,-149.0175) cell lat/lon = (-81.6600,-148.9887) Forecast initialized at 2026-04-29/00 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 29 00 -26.9 -33.9 28.05 20 27 113 324 -003 57 55 91 -21-20-20 000 1 29 01 -25.4 -29.1 28.00 22 35 113 324 007 89102101 -22-18-18 002 2 29 02 -24.5 -27.3 27.94 23 39 90 301 007 98102 94 -19-16-16 016 3 29 03 -20.3 -22.7 27.90 26 45 77 288 026 99 99 65 -16-15-16 051 4 29 04 -18.9 -20.4 27.88 28 40 45 256 041 107102 70 -19-20-22 020 5 29 05 -23.5 -26.4 27.87 33 46 18 229 048 96101 70 -24-25-26 000 6 29 06 -26.4 -29.3 27.87 36 51 24 235 047 98114 81 -27-28-29 000 7 29 07 -29.4 -32.3 27.88 38 51 23 234 059 101118 82 -30-31-30 000 8 29 08 -31.9 -34.1 27.89 38 50 19 230 059 113120 75 -33-33-32 000 9 29 09 -33.4 -36.2 27.91 36 48 18 229 032 106116 95 -34-35-35 005 10 29 10 -33.2 -36.5 27.99 36 47 15 226 026 99111 98 -34-35-35 011 11 29 11 -32.5 -35.7 28.02 34 45 17 228 043 101111103 -33-34-34 014 12 29 12 -31.6 -34.5 28.03 36 48 20 231 039 102115106 -32-34-34 010 13 29 13 -33.5 -36.7 28.09 34 45 14 225 038 101109103 -34-34-32 014 14 29 14 -33.8 -37.1 28.14 35 49 14 225 037 100110104 -34-35-32 011 15 29 15 -32.4 -35.7 28.18 34 46 15 226 035 98112103 -33-35-34 012 16 29 16 -32.3 -35.6 28.21 35 46 15 226 034 99112 99 -33-34-34 011 17 29 17 -32.2 -35.4 28.26 34 45 14 225 027 100112 98 -33-34-34 011 18 29 18 -32.4 -35.5 28.29 35 45 12 223 032 101111 94 -33-34-33 011 19 29 19 -32.4 -35.6 28.31 37 47 12 223 034 100108 85 -33-34-32 012 20 29 20 -32.6 -35.7 28.34 37 48 9 220 022 102108 83 -33-34-32 012 21 29 21 -32.3 -35.5 28.38 36 47 5 216 018 101110 78 -33-34-31 012 22 29 22 -32.3 -35.2 28.41 35 46 1 212 010 103110 77 -33-34-31 012 23 29 23 -32.4 -35.4 28.46 34 44 358 209 001 102109 80 -33-34-32 010 24 30 00 -32.3 -35.2 28.52 30 40 0 211 -002 104110 91 -33-33-31 008 25 30 01 -31.7 -34.2 28.59 25 34 2 213 001 108105104 -32-32-28 006 26 30 02 -31.4 -34.2 28.66 22 30 4 215 -002 104108102 -32-31-30 008 27 30 03 -31.3 -33.5 28.71 20 33 3 214 000 111102 95 -31-30-28 004 28 30 04 -31.9 -33.3 28.75 21 28 6 217 004 123105 83 -31-30-28 001 29 30 05 -32.8 -34.4 28.79 19 26 0 211 006 122 87 83 -31-29-28 001 30 30 06 -33.9 -35.4 28.84 17 25 353 204 010 125 77 88 -30-28-28 000 31 30 07 -34.3 -35.8 28.87 15 23 351 202 007 124 81 87 -29-27-27 000 32 30 08 -34.5 -36.0 28.90 13 19 357 208 000 124 82 82 -28-27-27 000 33 30 09 -34.5 -36.1 28.92 11 21 4 215 -005 124 86 78 -28-27-28 000 34 30 10 -35.1 -36.8 28.96 11 16 32 243 -009 123 86 76 -28-27-27 000 35 30 11 -34.9 -36.5 28.98 11 18 41 252 -010 124 91 70 -29-27-28 000 36 30 12 -34.7 -36.3 29.00 11 18 44 255 -010 124 94 66 -28-28-28 000 37 30 13 -34.9 -36.5 29.02 11 17 50 261 -009 125 93 65 -29-28-28 000 38 30 14 -34.7 -35.9 29.03 10 14 47 258 -007 130 93 62 -27-27-28 000 39 30 15 -34.2 -35.2 29.03 10 13 45 256 -002 131 78 68 -27-27-27 000 40 30 16 -34.9 -35.5 29.04 12 17 56 267 001 139 78 69 -28-27-27 000 41 30 17 -35.2 -36.0 29.04 11 17 62 273 001 137 79 70 -27-27-27 000 42 30 18 -34.6 -35.5 29.03 11 17 74 285 002 133 92 63 -26-27-27 000 43 30 19 -33.4 -34.3 29.03 11 18 77 288 001 130 62 60 -26-26-27 000 44 30 20 -33.8 -34.6 29.03 12 20 77 288 000 134 67 54 -26-26-27 000 45 30 21 -33.9 -35.1 29.02 12 22 78 289 001 127 69 48 -26-26-26 000 46 30 22 -33.6 -35.0 29.01 13 22 80 291 002 124 59 43 -26-25-26 000 47 30 23 -33.3 -34.9 29.01 13 24 83 294 002 121 56 42 -25-25-26 000 48 01 00 -33.1 -34.8 29.01 13 25 87 298 002 118 50 42 -24-25-25 000 49 01 01 -33.0 -35.0 28.99 13 25 89 300 000 114 48 41 -24-24-25 000 50 01 02 -32.9 -35.2 28.99 14 26 90 301 001 110 46 37 -25-24-24 000 51 01 03 -32.8 -35.6 28.98 14 27 90 301 001 104 45 33 -25-24-24 000 52 01 04 -32.6 -35.8 28.96 14 27 92 303 002 99 44 30 -24-24-24 000 53 01 05 -32.7 -36.5 28.95 14 27 94 305 002 92 40 27 -24-23-24 000 54 01 06 -32.7 -37.1 28.93 15 27 97 308 003 86 40 24 -24-23-23 000 55 01 07 -32.5 -37.1 28.91 15 28 104 315 003 83 42 23 -24-23-23 000 56 01 08 -32.1 -37.2 28.90 16 32 110 321 003 78 39 21 -24-23-22 000 57 01 09 -31.6 -37.3 28.88 17 33 111 322 003 72 37 19 -24-22-22 000 58 01 10 -31.3 -37.3 28.86 18 33 113 324 002 68 35 18 -24-22-22 000 59 01 11 -30.9 -37.2 28.84 18 34 116 327 003 67 31 17 -24-21-21 000 60 01 12 -30.9 -37.1 28.82 18 33 117 328 003 67 29 16 -23-21-21 000 61 01 13 -30.6 -37.1 28.80 18 34 121 332 004 64 26 15 -22-21-20 000 62 01 14 -30.2 -36.9 28.77 18 34 125 336 003 62 21 13 -22-21-20 000 63 01 15 -29.8 -36.7 28.75 17 34 127 338 001 60 19 12 -22-20-19 000 64 01 16 -29.5 -36.6 28.72 17 34 128 339 003 59 18 11 -21-19-18 000 65 01 17 -29.3 -36.6 28.69 17 34 128 339 001 57 16 10 -21-18-17 000 66 01 18 -29.0 -36.4 28.67 16 34 127 338 003 56 14 10 -20-18-17 000 67 01 19 -28.5 -36.0 28.64 16 34 129 340 002 55 11 10 -18-17-16 000 68 01 20 -27.7 -34.9 28.63 15 33 126 337 -001 56 10 10 -18-16-15 000 69 01 21 -26.9 -33.5 28.61 14 30 122 333 003 62 9 9 -17-15-15 000 70 01 22 -26.4 -31.6 28.58 14 28 128 340 003 74 8 8 -15-14-13 000 71 01 23 -25.6 -28.7 28.56 13 27 127 338 -002 95 6 8 -14-13-13 000 72 02 00 -25.0 -26.2 28.55 13 26 124 335 001 116 11 7 -14-12-12 000 73 02 01 -23.6 -24.7 28.53 12 25 119 330 -001 116 48 4 -13-12-12 000 74 02 02 -23.0 -23.6 28.51 12 24 110 321 000 122 53 41 -13-12-12 000 75 02 03 -21.9 -22.7 28.49 11 21 107 318 000 116 54 46 -13-12-12 000 76 02 04 -22.0 -22.4 28.47 11 20 101 312 001 122 53 47 -13-12-12 000 77 02 05 -21.2 -21.9 28.46 11 18 94 305 003 117 55 52 -12-12-12 000 78 02 06 -20.3 -21.0 28.45 10 16 91 302 001 115 64 53 -11-11-11 000 79 02 07 -18.6 -20.4 28.44 10 18 84 295 001 101 70 67 -11-11-11 000 80 02 08 -17.2 -21.7 28.44 9 14 84 295 000 72 62 92 -10-11-12 000 81 02 09 -17.8 -20.4 28.43 10 17 88 299 000 93 59 86 -10-11-12 000 82 02 10 -17.5 -20.4 28.43 10 16 73 284 -002 87 70 78 -10-11-12 000 83 02 11 -19.2 -20.5 28.44 10 18 52 263 003 107 78 72 -10-11-12 000 84 02 12 -19.6 -20.3 28.45 11 16 51 262 000 116 93 73 -10-11-11 000 85 02 13 -20.7 -21.1 28.47 11 16 51 262 -007 120 84 94 -10-10-11 000 86 02 14 -20.4 -21.1 28.48 11 16 49 260 -008 117 73 70 -10-10-11 000 87 02 15 -19.3 -21.6 28.49 11 15 45 256 -003 94 53 49 -9-10-11 000 88 02 16 -20.0 -20.6 28.51 13 19 56 267 001 118 57 58 -9 -9-10 000 89 02 17 -19.7 -20.8 28.54 14 21 51 262 -003 112 60 67 -10 -9 -9 000 90 02 18 -20.8 -21.3 28.56 14 21 54 265 -007 121 54 75 -9 -8 -9 000 91 02 19 -20.0 -20.4 28.58 12 18 54 265 -003 120 57 77 -9 -9-10 000 92 02 20 -18.6 -19.6 28.60 12 19 51 262 000 111 67 67 -9 -9-10 000 93 02 21 -20.2 -20.6 28.62 12 21 50 261 005 120 72 66 -10 -9-10 000 94 02 22 -19.5 -20.7 28.64 13 23 51 262 000 109 39 50 -10 -9-10 000 95 02 23 -20.4 -20.8 28.66 14 28 66 277 -012 121 37 44 -10-10-10 000 96 03 00 -19.8 -20.7 28.67 15 25 70 281 -010 113 39 42 -11-10-10 000 97 03 01 -21.1 -21.6 28.68 11 23 60 271 001 120 51 36 -12-10-10 000 98 03 02 -19.6 -21.5 28.68 16 23 58 269 004 102 44 37 -9-10 -9 000 99 03 03 -19.8 -21.8 28.68 16 24 76 287 -003 101 40 42 -9 -9 -9 000 100 03 04 -20.0 -22.2 28.68 14 22 77 288 001 100 38 38 -9 -9-10 000 101 03 05 -20.9 -22.9 28.66 14 23 76 287 004 104 35 40 -9 -9 -9 000 102 03 06 -21.6 -23.3 28.65 16 27 76 287 -006 107 34 33 -9 -9 -9 000 103 03 07 -21.9 -24.0 28.63 18 31 71 282 -006 103 33 34 -13-10 -8 000 104 03 08 -21.1 -24.4 28.61 23 36 72 283 001 89 26 38 -14 -8 -7 000 105 03 09 -20.3 -24.0 28.59 24 40 73 284 002 85 33 38 -17-10 -7 000 106 03 10 -19.4 -23.4 28.56 25 40 77 288 -007 81 35 38 -18-11 -8 000 107 03 11 -20.0 -24.2 28.54 25 38 77 288 004 81 34 34 -17-11 -7 000 108 03 12 -20.4 -24.5 28.53 25 38 76 287 001 82 37 27 -16-13-11 000 109 03 13 -21.1 -24.3 28.51 21 36 80 291 -001 90 36 27 -16-14-13 000 110 03 14 -20.9 -23.4 28.49 20 35 76 287 003 97 41 37 -15-13-13 000 111 03 15 -19.4 -21.6 28.47 21 34 69 280 009 99 46 39 -13-12-13 000 112 03 16 -18.6 -20.2 28.47 22 35 66 277 011 105 43 56 -14-12-12 000 113 03 17 -18.7 -19.9 28.50 24 40 54 265 -001 109 53 57 -18-13-13 000 114 03 18 -19.7 -20.0 28.53 26 40 47 258 019 120 75 77 -19-14-13 000 115 03 19 -18.7 -19.1 28.56 28 43 41 252 041 119109 80 -17-16-15 000 116 03 20 -18.4 -19.0 28.59 28 41 43 254 035 116101 92 -16-15-15 000 117 03 21 -18.1 -18.9 28.62 27 42 42 253 032 113102 75 -15-16-16 000 118 03 22 -19.0 -20.5 28.65 23 39 52 263 012 107 86 60 -15-15-16 000 119 03 23 -20.5 -22.4 28.68 20 33 58 269 016 104 76 63 -14-15-16 000 120 04 00 -21.6 -23.1 28.70 16 27 63 274 008 109 71 53 -14-14-15 000 * 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.