UPPER AIR CALCULATIONS AND PLOTTING (Ver 5.52-LINUX-X11) Current filename: /home/data/upa/2025061800.upa.cvt Date: 0000Z 18 JUN 25 Searching for KMAF... Searching the city database file for: KMAF ... Date:0000Z 18 JUN 25 Station: KMAF WMO ident: 72265 Latitude: 31.95 Longitude: -102.22 Elevation: 872.00 ------------------------------------------------------------------------------- LEV PRES HGHT TEMP DEWP RH DD WETB DIR SPD THETA THE-V THE-W THE-E W mb m C C % C C deg knt K K K K g/kg ------------------------------------------------------------------------------- 0 1000 -29 1 925 699 SFC 908 872 39.2 15.2 24 24.0 22.2 195 22 321.1 323.4 298.6 359.5 12.05 3 904 912 38.0 14.0 24 24.0 21.2 176 25 320.3 322.4 297.8 355.8 11.18 4 850 1467 30.2 12.2 33 18.0 18.0 180 30 317.8 319.8 296.8 351.1 10.56 5 800 2004 26.0 10.0 37 16.0 15.4 203 22 318.9 320.7 296.5 349.5 9.68 6 794 2070 25.6 9.6 36 16.0 15.1 207 21 319.1 321.0 296.5 349.2 9.50 7 786 2159 25.6 7.6 32 18.0 14.1 212 20 320.0 321.7 295.9 346.7 8.36 8 773 2305 24.8 4.8 27 20.0 12.4 229 18 320.7 322.1 295.1 343.2 6.99 9 748 2592 23.4 -4.6 15 28.0 8.5 255 15 322.2 322.9 292.9 334.2 3.63 10 700 3164 17.8 -3.2 24 21.0 6.5 265 16 322.2 323.0 293.4 336.4 4.31 11 638 3945 10.6 -5.4 32 16.0 2.5 281 23 322.7 323.5 293.3 335.9 4.01 12 611 4303 7.8 -11.2 25 19.0 -0.7 290 28 323.5 324.0 292.4 332.4 2.66 13 500 5910 -7.3 -13.3 62 6.0 -9.6 265 21 324.1 324.7 292.6 333.4 2.74 14 498 5941 -7.5 -13.5 62 6.0 -9.8 264 21 324.3 324.8 292.6 333.4 2.71 15 493 6019 -8.1 -14.1 62 6.0 -10.4 262 21 324.5 325.0 292.6 333.3 2.61 16 485 6146 -9.3 -16.3 57 7.0 -11.8 259 21 324.5 325.0 292.3 332.0 2.21 17 468 6419 -12.1 -16.5 70 4.4 -13.6 256 20 324.4 324.8 292.3 332.0 2.25 18 465 6468 -12.5 -16.9 70 4.4 -14.0 258 21 324.5 324.9 292.2 331.9 2.19 19 453 6668 -10.7 -39.7 7 29.0 -16.3 268 26 329.2 329.2 291.7 330.2 0.27 20 441 6874 -11.7 -44.7 5 33.0 -17.2 278 30 330.4 330.5 292.0 331.1 0.16 21 400 7610 -18.3 -44.3 8 26.0 -22.1 290 36 331.2 331.2 292.2 331.9 0.19 22 380 7991 -21.5 -45.5 10 24.0 -24.6 289 37 331.9 331.9 292.4 332.6 0.17 23 377 8049 -21.7 -45.7 10 24.0 -24.8 288 37 332.4 332.4 292.5 333.0 0.17 24 368 8227 -23.1 -49.1 7 26.0 -26.1 285 36 332.8 332.8 292.6 333.3 0.12 25 342 8760 -27.1 -47.1 13 20.0 -29.3 283 38 334.4 334.5 293.1 335.1 0.16 26 331 8995 -29.1 -51.1 10 22.0 -31.1 281 38 334.8 334.8 293.1 335.2 0.11 27 326 9104 -30.1 -49.1 14 19.0 -31.9 280 39 334.9 334.9 293.2 335.4 0.13 28 318 9280 -31.7 -51.7 12 20.0 -33.3 282 41 335.1 335.1 293.2 335.5 0.10 29 300 9690 -35.1 -48.1 25 13.0 -36.2 290 48 335.9 335.9 293.4 336.6 0.16 30 264 10566 -43.1 -51.1 41 8.0 -43.6 288 48 336.7 336.7 293.6 337.2 0.13 31 259 10694 -44.3 -52.3 41 8.0 -44.7 290 48 336.8 336.8 293.6 337.3 0.12 32 250 10930 -46.1 -55.1 35 9.0 -46.5 290 51 337.5 337.5 293.8 337.9 0.09 33 249 10957 -46.1 -55.1 35 9.0 -46.5 290 51 337.9 337.9 293.9 338.3 0.09 34 247 11010 -46.7 -54.7 40 8.0 -47.0 290 51 337.8 337.8 293.9 338.2 0.09 35 222 11712 -49.9 -64.9 16 15.0 -50.3 286 49 343.3 343.4 295.1 343.5 0.03 36 211 12043 -50.7 -68.7 10 18.0 -51.1 288 47 347.1 347.1 296.0 347.2 0.02 37 200 12390 -51.9 -71.9 7 20.0 -52.2 265 46 350.6 350.6 296.8 350.6 0.01 38 198 12455 -52.1 -72.1 7 20.0 -52.5 268 45 351.3 351.3 296.9 351.3 0.01 39 196 12521 -52.5 -72.5 7 20.0 -52.8 269 45 351.7 351.7 297.0 351.7 0.01 40 179 13102 -56.1 -74.1 9 18.0 -56.3 265 46 355.0 355.0 297.7 355.1 0.01 41 170 13429 -58.3 -75.3 10 17.0 -58.5 250 40 356.6 356.6 298.0 356.7 0.01 42 158 13887 -60.7 -78.7 8 18.0 -60.9 262 48 360.1 360.1 298.7 360.1 0.01 43 153 14087 -60.5 -79.5 7 19.0 -60.7 270 48 363.8 363.8 299.4 363.8 0.00 44 150 14210 -60.9 -79.9 6 19.0 -61.1 280 41 365.2 365.2 299.7 365.2 0.00 45 135 14860 -64.7 -84.7 5 20.0 -64.8 273 28 369.6 369.6 300.5 369.6 0.00 46 127 15230 -67.9 -85.9 6 18.0 -68.0 265 25 370.3 370.3 300.6 370.3 0.00 47 118 15670 -70.5 -86.5 8 16.0 -70.6 260 34 373.4 373.4 301.2 373.4 0.00 48 116 15771 -70.7 -85.7 9 15.0 -70.8 266 35 374.9 374.9 301.4 374.9 0.00 49 113 15927 -70.5 -84.5 11 14.0 -70.6 276 38 378.1 378.1 301.9 378.1 0.00 50 110 16086 -70.9 -84.9 11 14.0 -70.9 286 40 380.2 380.2 302.3 380.2 0.00 51 102 16533 -71.7 -86.7 9 15.0 -71.8 313 25 387.0 387.0 303.3 387.0 0.00 52 100 16650 -71.7 -85.7 11 14.0 -71.8 320 20 389.2 389.2 303.7 389.2 0.00 53 98 16769 -71.5 -85.5 11 14.0 -71.6 319 24 391.8 391.8 304.0 391.9 0.00 54 96 16891 -71.5 -85.5 11 14.0 -71.6 305 15 394.2 394.2 304.4 394.2 0.00 55 83 17758 -68.7 -86.7 6 18.0 -68.8 243 13 416.6 416.6 307.3 416.6 0.00 56 80 17978 -69.3 -90.3 3 21.0 -69.4 250 10 419.8 419.8 307.7 419.8 0.00 57 72 18610 -67.7 -91.7 2 24.0 -67.8 320 17 436.0 436.0 309.5 436.0 0.00 58 70 18780 -67.7 -90.7 2 23.0 -67.8 5 21 439.5 439.6 309.8 439.6 0.00 59 66 19133 -67.9 -90.9 2 23.0 -68.1 17 21 446.6 446.6 310.6 446.6 0.00 60 65 19224 -67.7 -91.7 2 24.0 -67.9 32 21 449.0 449.0 310.7 449.0 0.00 61 63 19412 -67.1 -91.1 2 24.0 -67.3 88 14 454.3 454.3 311.3 454.3 0.00 62 61 19606 -67.5 -90.5 2 23.0 -67.7 120 10 457.6 457.6 311.5 457.6 0.00 63 58 19909 -66.5 -90.5 2 24.0 -66.7 142 8 466.5 466.5 312.4 466.6 0.00 64 56 20121 -66.7 -89.7 3 23.0 -66.9 165 5 470.8 470.8 312.7 470.8 0.00 65 50 20810 -63.1 -88.1 2 25.0 -63.5 80 14 494.8 494.8 314.6 494.8 0.00 66 44 21608 -57.9 -83.9 2 26.0 -58.7 105 24 525.9 525.9 316.6 526.0 0.01 67 42 21903 -56.5 -82.5 2 26.0 -57.5 105 23 536.4 536.4 317.3 536.5 0.01 68 40 22212 -57.1 -83.1 2 26.0 -58.1 87 12 542.5 542.5 317.6 542.5 0.01 69 39 22373 -57.3 -83.3 2 26.0 -58.3 78 11 545.9 545.9 317.9 546.0 0.01 70 35 23061 -55.3 -81.3 3 26.0 -56.6 79 17 568.3 568.3 319.0 568.4 0.02 71 30 24050 -53.7 -79.7 3 26.0 -55.5 105 14 598.2 598.3 320.5 598.4 0.02 72 28 24495 -52.5 -79.5 2 27.0 -54.6 103 14 613.5 613.5 321.2 613.7 0.03 73 25 25227 -52.7 -78.7 3 26.0 -54.9 116 10 633.1 633.2 322.0 633.4 0.03 74 22 26057 -50.3 -77.3 3 27.0 -53.4 60 12 663.9 663.9 323.2 664.2 0.05 75 21 26361 -49.7 -76.7 3 27.0 -53.1 58 16 674.6 674.6 323.6 675.0 0.05 76 20 26680 -49.9 -76.9 3 27.0 -53.4 95 28 683.4 683.5 323.9 683.9 0.05 77 19 27016 -49.5 -76.5 3 27.0 -53.2 103 25 694.8 694.8 324.3 695.3 0.06 78 18 27371 -48.7 -75.7 3 27.0 -52.8 97 19 708.1 708.2 324.7 708.8 0.07 79 17 27747 -47.9 -74.9 3 27.0 -52.4 82 16 722.4 722.4 325.1 723.1 0.09 80 15 28576 -46.7 -73.7 3 27.0 -52.0 86 15 752.7 752.7 326.0 753.8 0.12 81 15 28576 -46.7 -73.7 3 27.0 -52.0 86 15 752.7 752.7 326.0 753.8 0.12 82 14 29033 -47.3 -73.3 4 26.0 -52.5 63 15 765.6 765.7 326.4 766.9 0.13 83 14 29033 -47.7 -74.7 3 27.0 -52.8 63 15 764.3 764.3 326.4 765.3 0.11 84 12 30055 -45.9 -72.9 3 27.0 -52.2 77 22 805.1 805.2 327.4 806.8 0.17 85 11 30637 -44.1 -71.1 3 27.0 -51.5 74 20 831.9 832.1 328.1 834.4 0.24 86 10 31280 -41.5 -69.5 3 28.0 -50.6 70 18 864.6 864.8 328.8 868.2 0.33 87 9.5 31630 -39.1 -68.1 3 29.0 -49.7 886.5 886.7 329.2 891.2 0.42 88 9.2 31850 -38.7 -67.7 3 29.0 -49.6 896.2 896.5 329.4 901.4 0.46 89 8.1 32720 -40.9 -67.9 4 27.0 -51.1 920.7 921.0 329.9 926.6 0.51 90 7.8 32977 -41.1 -68.1 4 27.0 -51.4 929.9 930.2 330.1 935.9 0.51 91 7.4 33335 -40.7 -68.7 3 28.0 -51.5 945.6 945.9 330.4 951.5 0.50 TRP 118 15670 -70.5 -86.5 8 16.0 -70.6 260 34 373.4 373.4 301.2 373.4 0.00 WND Sounding variables and indices 1000-500 mb thick: 5939.00 m Freezing level: 553.66 mb = 5133.21 m = 16841.02 ft Wetbulb zero: 616.83 mb = 4224.58 m = 13860.02 ft Precipitable water: 0.98 inches Sfc-500 mean rel hum: 32.82 % Est. max temperature: 39.71 C = 103.48 F Sfc-Lift cond lev (LCL): 644.04 mb = 3865.94 m = 12683.37 ft T: 11.33 C 700-500 lapse rate: 9.14 C/km ThetaE index: 25.24 C Layer 904.0- 700.0 mb Conv cond level (CCL): 606.34 mb = 4364.58 m = 14319.31 ft Mean mixing ratio: 10.61 g/kg Conv temperature: 41.55 C = 106.79 F Cap Strength: 3.42 C Lifted Index: -5.15 C Risk: Severe thunderstorms probable Lifted Index @300 mb: -7.93 C Lifted Index @700 mb: 3.12 C Showalter Index: -4.74 C Risk: Severe thunderstorms possible Total Totals Index: 57.00 C Risk: Severe Thunderstorms probable Vertical Totals Index: 37.50 C Cross Totals Index: 19.50 C K Index: 28.70 Risk: 40-60 % chance of thunderstorms Sweat Index: 536.92 Risk: Severe Thunderstorms possible Energy Index: -3.32 Risk: Severe Thunderstorms probable Parcel Indices Parcel: using 100 mb layer CAPE (B+): 1803.48 J/kg Max Up Vert Vel: 60.06 m/s Conv Inhibition (B-): 229.48 J/kg Cap Strength: 3.42 C Lift Cond Lev (LCL): 646.22 mb = 3837.48 m = 12590.01 ft Lev Free Conv (LFC): 571.22 mb = 4842.80 m = 15888.24 ft Equ Level (EL): 191.22 mb = 12679.11 m = 41597.64 ft B at Equ Level: 1795.85 J/kg Max Parcel Lev (MPL): 101.22 mb = 16578.58 m = 54391.01 ft Wind level data Storm motion: 285 at 17 knt ---------------------------------------------------------- TRUE/GROUND REL | STORM REL LEV P H DIR SPD U V | DIR SPD U V mb m knt m/s | knt m/s ---------------------------------------------------------- 0 908 872 195 22 5.7 21.3 | 158 28 -10.5 25.6 1 904 914 175 25 -2.2 24.9 | 148 35 -18.4 29.2 2 874 1219 175 29 -2.5 28.9 | 151 38 -18.7 33.2 3 850 1467 180 30 0.0 30.0 | 155 38 -16.2 34.3 4 844 1524 185 31 2.7 30.9 | 159 38 -13.5 35.2 5 816 1829 195 25 6.5 24.1 | 161 30 -9.7 28.5 6 788 2134 210 20 10.0 17.3 | 164 22 -6.2 21.6 7 761 2438 245 16 14.5 6.8 | 171 11 -1.7 11.1 8 735 2743 265 13 13.0 1.1 | 149 6 -3.2 5.4 9 709 3048 275 17 16.9 -1.5 | 195 3 0.7 2.8 10 700 3164 265 16 15.9 1.4 | 178 6 -0.2 5.7 11 684 3353 270 14 14.0 -0.0 | 153 5 -2.2 4.3 12 659 3658 275 20 19.9 -1.7 | 236 5 3.7 2.6 13 611 4267 290 28 26.3 -9.6 | 297 11 10.1 -5.3 14 567 4877 285 22 21.3 -5.7 | 285 5 5.1 -1.4 15 547 5182 280 26 25.6 -4.5 | 271 9 9.4 -0.2 16 527 5486 270 23 23.0 -0.0 | 238 8 6.8 4.3 17 500 5910 265 21 20.9 1.8 | 218 8 4.7 6.1 18 488 6096 260 21 20.7 3.6 | 209 9 4.5 8.0 19 469 6401 255 20 19.3 5.2 | 198 10 3.1 9.5 20 433 7010 285 33 31.9 -8.5 | 285 16 15.7 -4.2 21 416 7315 295 35 31.7 -14.8 | 304 19 15.5 -10.5 22 400 7610 290 36 33.8 -12.3 | 294 19 17.6 -8.0 23 399 7620 295 35 31.7 -14.8 | 304 19 15.5 -10.5 24 383 7925 290 37 34.8 -12.7 | 294 20 18.6 -8.3 25 367 8230 285 36 34.8 -9.3 | 285 19 18.6 -5.0 26 352 8534 285 37 35.7 -9.6 | 285 20 19.6 -5.3 27 324 9144 280 39 38.4 -6.8 | 276 22 22.2 -2.5 28 300 9690 290 48 45.1 -16.4 | 293 31 28.9 -12.1 29 297 9754 290 47 44.2 -16.1 | 293 30 28.0 -11.8 30 272 10363 285 48 46.4 -12.4 | 285 31 30.2 -8.1 31 260 10668 290 48 45.1 -16.4 | 293 31 28.9 -12.1 32 250 10930 290 51 47.9 -17.4 | 292 34 31.7 -13.1 33 248 10973 290 51 47.9 -17.4 | 292 34 31.7 -13.1 34 237 11278 290 50 47.0 -17.1 | 293 33 30.8 -12.8 35 216 11887 285 48 46.4 -12.4 | 285 31 30.2 -8.1 36 206 12192 290 47 44.2 -16.1 | 293 30 28.0 -11.8 37 200 12390 265 46 45.8 4.0 | 254 31 29.6 8.3 38 197 12497 270 45 45.0 -0.0 | 261 29 28.8 4.3 39 187 12802 260 52 51.2 9.0 | 249 37 35.0 13.3 40 179 13106 265 46 45.8 4.0 | 254 31 29.6 8.3 41 170 13411 250 40 37.6 13.7 | 230 28 21.4 18.0 42 155 14021 265 51 50.8 4.4 | 256 36 34.6 8.8 43 150 14210 280 41 40.4 -7.1 | 277 24 24.2 -2.8 44 140 14630 280 34 33.5 -5.9 | 275 17 17.3 -1.6 45 133 14935 270 26 26.0 -0.0 | 246 11 9.8 4.3 46 127 15240 265 25 24.9 2.2 | 233 11 8.7 6.5 47 120 15545 255 30 29.0 7.8 | 227 18 12.8 12.1 48 118 15670 260 34 33.5 5.9 | 239 20 17.3 10.2 49 109 16154 290 41 38.5 -14.0 | 293 24 22.3 -9.7 50 100 16650 320 20 12.9 -15.3 | 17 12 -3.3 -11.0 51 98 16764 320 24 15.4 -18.4 | 3 14 -0.8 -14.1 52 93 17069 285 3 2.9 -0.8 | 105 14 -13.3 3.5 53 89 17374 245 11 10.0 4.6 | 145 11 -6.2 9.0 54 84 17678 240 14 12.1 7.0 | 160 12 -4.1 11.3 55 80 17983 250 10 9.4 3.4 | 139 10 -6.8 7.7 56 76 18288 310 19 14.6 -12.2 | 12 8 -1.6 -7.9 57 72 18593 315 17 12.0 -12.0 | 28 9 -4.2 -7.7 58 70 18780 5 21 -1.8 -20.9 | 47 25 -18.0 -16.6 59 69 18898 350 18 3.1 -17.7 | 44 19 -13.1 -13.4 60 65 19202 25 22 -9.3 -19.9 | 58 30 -25.5 -15.6 61 62 19507 115 10 -9.1 4.2 | 109 27 -25.2 8.5 62 59 19812 130 10 -7.7 6.4 | 114 26 -23.8 10.7 63 56 20117 165 5 -1.3 4.8 | 118 20 -17.5 9.1 64 53 20422 180 3 0.0 3.0 | 114 18 -16.2 7.3 65 51 20726 335 8 3.4 -7.3 | 77 13 -12.8 -2.9 66 50 20810 80 14 -13.8 -2.4 | 94 30 -30.0 1.9 67 48 21031 20 10 -3.4 -9.4 | 75 20 -19.6 -5.1 68 46 21336 105 17 -16.4 4.4 | 105 34 -32.6 8.7 69 44 21641 105 25 -24.1 6.5 | 105 42 -40.3 10.8 70 42 21946 105 23 -22.2 6.0 | 105 40 -38.4 10.3 71 40 22250 85 11 -11.0 -1.0 | 97 27 -27.1 3.3 72 38 22555 70 11 -10.3 -3.8 | 91 27 -26.5 0.5 73 36 22860 100 23 -22.7 4.0 | 102 40 -38.8 8.3 74 34 23165 70 14 -13.2 -4.8 | 89 29 -29.3 -0.5 75 33 23470 85 17 -16.9 -1.5 | 95 33 -33.1 2.8 76 31 23774 105 19 -18.4 4.9 | 105 36 -34.5 9.2 77 30 24050 105 14 -13.5 3.6 | 105 31 -29.7 7.9 78 30 24079 70 19 -17.9 -6.5 | 86 34 -34.0 -2.2 79 28 24384 110 14 -13.2 4.8 | 107 31 -29.3 9.1 80 27 24689 90 14 -14.0 0.0 | 98 30 -30.2 4.3 81 26 24994 85 14 -13.9 -1.2 | 96 30 -30.1 3.1 82 25 25298 125 9 -7.4 5.2 | 112 25 -23.6 9.5 83 24 25603 115 8 -7.3 3.4 | 108 25 -23.4 7.7 84 23 25908 80 14 -13.8 -2.4 | 94 30 -30.0 1.9 85 21 26213 40 10 -6.4 -7.7 | 82 23 -22.6 -3.4 86 20 26680 95 28 -27.9 2.4 | 99 45 -44.1 6.7 87 19 27127 105 24 -23.2 6.2 | 105 41 -39.4 10.5 88 18 27432 95 18 -17.9 1.6 | 100 35 -34.1 5.9 89 17 27737 80 15 -14.8 -2.6 | 93 31 -31.0 1.7 90 16 28042 105 29 -28.0 7.5 | 105 46 -44.2 11.8 91 16 28346 110 21 -19.7 7.2 | 108 38 -35.9 11.5 92 15 28651 80 14 -13.8 -2.4 | 94 30 -30.0 1.9 93 14 28956 60 16 -13.9 -8.0 | 83 30 -30.0 -3.7 94 14 29261 70 14 -13.2 -4.8 | 89 29 -29.3 -0.5 95 13 29566 80 23 -22.7 -4.0 | 90 39 -38.8 0.3 96 10 31280 70 18 -16.9 -6.2 | 87 33 -33.1 -1.8 Wind Parameters Mean winds (0-6000m): 254.9 at 22.3 knts Storm direction: 284.9 at 16.7 knts Shear (0-3000m) pos: 7.0 neg: 1.8 tot: 8.9 10-3/s Storm rel Dir Shear (0-3000m): 110.1 deg Storm rel helicity (0-3000m) pos: 115.9 neg: -51.2 tot: 64.7 m^2/s^2 ave: 21.6 10^-3 m/s^2 rel: 0.19 Storm rel vorticity (0-3000m) horiz: 11.6 stream: 2.2 10^-3/s Energy-Hel index: 1.18 Bulk Rich Number: 13.49 Bulk Shear: 133.70 m/s Storm Parameters ------------------------------------------------------------------------------- Depth Mean Inflow| Shear | Helicity | Vorticity AGL Dir Spd Dir Spd| Pos Neg Tot| Pos Neg Tot Ave Rel | Hor Strm m knt knt| 10^-3/s | m^2/s^2 m/s^2 | 10^-3/s ------------------------------------------------------------------------------- 500 176 27 150 36| 0.0 11.0 11.0| 30.5 -41.5 -11.0 -22.0 -0.14| 14.2 -2.1 1000 182 28 155 36| 5.3 5.5 10.8| 83.2 -41.5 41.8 41.8 0.13| 13.4 1.8 1500 189 25 158 32| 8.8 3.7 12.4|103.0 -41.5 61.5 41.0 0.17| 14.3 2.4 2000 199 23 161 27| 8.6 2.8 11.3|104.3 -47.6 56.7 28.3 0.10| 13.3 1.3 2500 209 21 166 24| 6.9 2.2 9.1|106.2 -51.2 55.0 22.0 0.07| 12.0 0.9 3000 220 21 172 20| 7.0 1.8 8.9|115.9 -51.2 64.7 21.6 0.19| 11.6 2.2 4000 243 22 194 15| 6.0 2.0 8.0|125.7 -54.8 70.9 17.7 0.19| 10.4 2.0 5000 252 22 204 12| 4.8 2.2 7.1|125.7 -74.6 51.1 10.2 0.07| 9.6 0.6 6000 255 22 208 11| 5.2 2.2 7.4|164.3 -82.1 82.3 13.7 0.15| 9.5 1.4 Wrote GIF file: /home/apache/climate/data/raob//KMAF/skewt/KMAF.skewt.20250618.00.gif