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ACAR Statistics Versus the NCEP Guess
September 2025
Pressure Categories (hPa)
LOW: PRES > 700.0
MID: PRES <= 700.0 and PRES >= 300.0
HIGH: PRES < 300.0
SID: aircraft tail number
NA: number of temperature or wind reports available in the pressure category
NR: number of temperature or wind reports rejected in the pressure category
QB: humidity bias (OB - Guess) in 0.1 g/kg
QSTD: standard deviation of humidity difference of (OB - Guess)
Specific Humidity
NA NR TB TSTD
level high low mid high low mid high low mid high low mid
sid
05DEOEZA 3587 3852 4129 3586 160 133 -0.013416 7.373759 0.087691 0.344939 13.784563 6.598119
0UZUOGBA 2968 3814 4059 2966 132 59 0.136561 3.747131 -0.076116 0.323069 12.402081 6.568316
0V0EOEZA 2911 3846 3958 2911 141 41 0.126972 9.195687 0.402934 0.314283 13.840095 6.693239
13KGUWRA 699 1662 1531 699 205 116 0.309560 -0.731426 0.258515 0.549981 16.944727 8.017956
1DFUOEZA 2805 3977 4117 2802 135 66 0.150444 7.413995 0.176855 0.300341 13.556592 6.118724
1LSEOEZA 3184 4085 4209 3182 176 115 0.056616 5.256519 0.121628 0.298906 12.567149 6.016534
2GPUOGBA 2985 3730 3892 2985 168 101 0.061062 5.652726 0.118760 0.292438 13.059368 6.753859
2LKUOGRA 2967 3857 3990 2965 147 50 0.035584 4.009438 -0.318948 0.270264 12.406989 6.142894
2ROUOGBA 2992 4295 4467 2989 137 61 0.112516 5.653704 0.066048 0.324113 12.972199 6.314184
2SIEOGBA 2849 4019 4305 2849 145 128 -0.082371 6.930199 0.129688 0.330243 13.302462 6.324709
31GEOGRA 2735 3509 3596 2734 118 56 0.240981 6.349123 -0.162423 0.398575 13.956628 6.911621
34IUOGBA 3230 4204 4143 3229 223 101 -0.092260 4.244075 -0.027968 0.251331 13.425234 6.340871
3OXWUWJA 675 1468 1222 675 139 63 -0.027132 2.636037 0.202019 0.458480 16.831759 7.019227
3PTUOGRA 2628 3728 3762 2625 122 60 0.117843 4.257183 0.075401 0.318436 12.964753 6.366086
3XUUOEZA 3079 4120 3928 3079 306 86 0.058697 6.008932 -0.147071 0.290870 12.758480 6.465647
3YHZXBRA 3020 3552 3775 3020 83 44 -0.067798 5.243725 -0.189569 0.313801 13.368867 6.519395
4ICZTOZA 3268 2800 3034 3266 82 26 -0.026430 8.639857 0.332811 0.319671 15.235874 6.718839
4JY0YGBA 3348 3639 4070 3345 195 72 0.060550 9.891329 0.477678 0.346994 13.954586 6.080490
5EVEOGBA 6 3621 3518 6 112 40 5.332078 15.838887 5.601347 2.018856 15.125076 7.230995
5NLUOEZA 3441 4316 4457 3440 152 59 0.000555 6.168393 0.473778 0.267645 13.111983 6.367280
5QRIESZA 3761 3444 4007 3760 136 63 -0.009676 4.953989 -0.358490 0.336536 13.453909 6.225435
A4FUOHBA 3364 3577 3768 3364 101 52 0.030901 4.431620 -0.269864 0.282673 12.136451 7.130712
AU2UOHBA 2637 2919 2898 2637 144 36 0.112041 7.167815 0.370456 0.392341 13.286589 6.641501
BCFEOHBA 3005 4031 4109 3003 168 53 0.211505 7.137196 0.223875 0.341882 13.938370 6.987574
BKUUOHBA 112 126 130 112 5 0 0.069309 9.289245 2.090119 0.118527 13.240908 5.653495
BLNHQVRA 2844 3925 4191 2843 174 127 -0.013565 6.110374 -0.009422 0.350898 13.081592 6.811208
BOOGUWJA 942 1952 1833 942 157 79 0.070778 4.695230 -0.003982 0.230446 13.493267 5.758483
BPZGUWRA 0 33 37 0 0 1 0.000000 -68.036525 -17.026480 0.000000 20.030713 21.564654
BSTXQVBA 0 4205 1730 0 263 44 0.000000 -64.873963 -27.355216 0.000000 25.909768 14.561789
BWWUOGBA 3042 3955 4157 3042 3955 4157 -0.046730 8.321880 0.055360 0.288642 14.279596 6.634797
C2SXQWJA 2925 3542 3687 2924 126 52 0.142639 5.837269 0.306770 0.304765 12.588174 6.661054
C3VWUWRA 0 1598 640 0 164 12 0.000000 -57.185808 -8.095058 0.000000 48.233348 25.565553
CG5UOFZA 2756 3622 3760 2755 144 55 0.027031 3.175023 -0.351163 0.288659 12.738172 6.345234
CGCEOHBA 10 3675 3272 10 156 28 4.962858 9.111562 4.097459 1.103652 14.067083 7.008656
CR4UOFZA 2518 3443 3675 2518 92 87 0.064661 7.239025 -0.349352 0.328682 13.596083 6.929685
CSYEOFZA 2635 3823 3786 2635 118 70 -0.053355 4.174201 0.521760 0.315498 12.326694 6.788605
CZBEOFZA 2934 3630 3773 2933 109 63 -0.025223 5.682569 -0.126280 0.295568 13.997878 6.914833
D1WEOHBA 2834 3667 3983 2834 127 50 0.302914 6.432618 0.350861 0.413760 13.444463 7.004960
D50LFRJA 3246 3592 3683 3246 137 66 0.101187 8.353655 0.048971 0.430603 13.746263 6.754675
DPLUOHBA 2845 3973 4056 2844 162 50 0.119123 5.641886 0.221535 0.379134 12.949891 6.203307
DQPFAXBA 3230 4220 4209 3230 182 55 0.079064 6.583376 -0.033591 0.303839 14.107689 6.982456
DVPUOFZA 2479 4046 4229 2478 117 139 0.304962 -57.310143 -10.372126 0.660460 26.299855 12.994031
EANUOHBA 2396 4106 4050 2396 172 132 -0.103507 6.949545 0.007182 0.428508 14.239728 6.903067
EC3EOHBA 2376 3481 3562 2374 119 81 -0.000068 6.943976 -0.034054 0.314010 13.945295 6.756109
F33GUWRA 781 1521 1564 781 151 70 0.029544 1.868664 -0.445155 0.239258 10.483478 5.238946
FESEOHBA 2760 3657 3886 2760 162 123 0.283695 9.402885 1.076149 0.627761 17.223433 8.344348
FGMUOHBA 2638 3570 3862 2638 141 136 -0.064726 5.116519 -0.241528 0.386007 13.124330 6.735401
FIYWYWZA 3088 3353 3571 3086 144 45 0.044571 8.572239 0.153297 0.351175 13.720926 6.520180
FMLEOHBA 3125 3653 3969 3123 137 68 0.047445 6.016271 0.012136 0.289715 13.073374 6.243471
FZXUOFZA 2733 3417 3490 2733 104 94 -0.039800 8.107269 0.360519 0.273050 15.459942 6.336311
G3SEESBA 3174 3585 3784 3173 148 67 0.196017 6.987634 0.227555 0.349676 12.921839 6.127807
G5TEOFJA 2835 3793 3793 2834 159 88 0.022123 6.783427 -0.202816 0.218649 12.889312 6.647263
GRBWUUZA 9 273 189 9 9 1 3.077848 -30.468520 -3.110155 0.341680 40.427315 22.860559
GUGEOHBA 3029 4038 4105 3029 148 55 0.070774 4.269958 -0.279713 0.341719 13.228432 6.093016
HCHYZYBA 3105 3328 3350 3105 145 67 -0.059499 9.169855 0.184256 0.335815 14.032763 6.683675
IKWWUUBA 735 1776 1471 735 163 60 0.321725 2.216721 1.192733 0.582004 18.919437 9.743155
INJUOGZA 2733 3856 4013 2733 120 89 0.018249 5.459856 -0.234003 0.318919 13.628906 6.687012
IVNEOGZA 3135 3890 3981 3133 147 45 0.000718 6.411899 0.155615 0.334424 13.871873 6.723487
IZUEOGZA 1443 2331 2403 1443 63 72 -0.057440 5.314783 -0.091435 0.314851 12.502524 6.014639
J3FEOGZA 2575 3580 3608 2575 130 62 0.006919 3.042421 0.077414 0.302815 12.427726 6.325772
JB2EOGZA 3445 4136 4237 3444 110 48 -0.012112 7.588428 0.273783 0.330981 14.098114 6.469952
JHCWUURA 262 1432 567 262 289 56 -0.218672 -0.869578 -1.144611 0.548646 13.644231 5.795097
JOHWUUBA 104 1632 905 104 99 44 1.356158 -29.122724 -2.289195 0.650607 39.745543 27.964113
L4VEOGRA 3374 3590 3700 3373 141 69 -0.064687 7.901001 0.045804 0.360148 14.520671 7.073600
LODEOGZA 3490 4304 4473 3489 142 113 0.028857 7.578502 0.248504 0.338846 13.431343 6.197052
LXQEOGJA 2997 3495 3592 2996 140 61 0.000520 7.132068 -0.176515 0.285056 13.737334 6.171894
M2YEOFBA 2146 3308 3443 2146 105 74 0.022087 8.085508 0.213933 0.335974 14.089435 7.160145
M5OEOGJA 935 2436 2206 935 164 215 0.208465 -18.131706 -3.434338 0.686286 41.652046 13.227660
MZNWU1ZA 567 1066 1024 567 57 29 0.102088 5.793952 0.555844 0.234720 13.748839 6.151153
N2RWUUBA 908 1403 1467 908 112 51 0.090749 4.905410 -0.526736 0.351606 13.007854 6.293563
NFFUOGZA 1669 4018 2199 1669 150 32 -0.239031 -43.383958 -14.611753 0.313466 19.326779 11.049552
NL1UOGJA 2705 3621 3750 2705 154 71 0.148583 5.870912 -0.328589 0.430149 13.355485 6.800753
OKLWU1ZA 464 722 715 464 52 3 0.140799 3.114314 0.031148 0.167837 12.941327 5.032839
OO1EOGZA 3076 3863 4038 3076 125 65 -0.046367 6.543919 0.353023 0.254167 13.254181 7.067004
OOOITPZA 3291 3147 3233 3290 151 41 -0.019445 9.311486 0.042998 0.372482 15.793031 7.190550
OUMUOGRA 3070 3739 3855 3069 128 48 -0.049459 6.921727 0.067291 0.309746 14.007088 6.799203
OZJEOGJA 2842 4028 4328 2841 164 114 0.041739 6.035311 0.226744 0.318484 12.929975 6.297372
PA3EOGRA 3201 3958 4039 3199 128 81 -0.013297 7.911694 0.102993 0.344283 13.879885 6.287157
PKEUOGRA 2938 4010 4023 2938 180 83 0.056112 6.819692 0.055538 0.286739 14.328501 6.733928
POWGU1ZA 1213 1857 1702 1213 165 33 0.191947 5.824795 0.231269 0.251877 12.726020 5.985936
PPJGU1JA 0 1778 1579 0 111 61 0.000000 9.462995 4.779117 0.000000 13.053950 6.388176
QA2EOFZA 3267 4009 4050 3267 170 84 0.157416 5.373917 0.063651 0.377088 13.421410 6.650810
QPIGUWBA 8 268 150 8 36 3 0.746408 -13.460868 4.002873 1.267011 44.742579 24.870733
QTYYEVZA 3603 3757 4057 3603 132 28 -0.025705 5.820507 -0.169650 0.244599 14.207055 6.384301
RH0EOFJA 2908 4072 4160 2907 150 69 -0.012235 5.749942 -0.107058 0.251905 13.102092 6.522952
RN1UOFJA 2855 3868 4017 2854 145 46 0.245802 6.328960 -0.070660 0.320619 13.009741 6.026421
RUZEOFRA 2197 2537 2709 2196 91 66 -0.016978 7.585941 0.157772 0.331031 14.398061 7.086260
S2X0YEBA 3441 3520 3562 3440 146 61 -0.069889 5.667170 -0.286061 0.293210 14.326776 6.473584
S4SUOFBA 2886 3478 3874 2885 119 68 0.018374 8.276742 0.363427 0.289893 14.428528 6.689230
SAEEOFRA 2281 3947 4214 2281 158 129 -0.117818 7.010600 0.259682 0.323146 13.924197 6.274392
SESWUUZA 439 1733 1415 439 1733 1415 0.441603 -2.212353 2.616715 0.713638 24.737212 16.497731
SQXIOYZA 0 3750 2071 0 200 7 0.000000 -50.953230 1.972432 0.000000 31.962695 21.451944
SSLIXKBA 645 661 709 645 35 6 0.192713 12.495824 0.475828 0.400596 14.615412 7.694221
SVWUOFJA 3135 3986 4147 3134 119 57 0.060831 3.136299 -0.280587 0.319202 12.989013 6.168407
SYVGUURA 232 1540 1337 232 1540 1337 1.006203 0.194473 -0.702765 0.546557 11.339412 5.350893
TCXUOFJA 3069 3609 3666 3069 146 52 0.117517 8.205006 0.280489 0.339746 13.494552 6.511489
TTT0FGBA 3795 3916 4245 3794 137 41 0.115444 7.865759 0.117457 0.323016 14.716829 6.883214
U43HQWRA 3153 3897 3910 3153 165 54 0.115095 7.260077 0.231703 0.419849 14.272061 6.684098
UBO0Z2ZA 694 894 930 694 95 151 -0.077100 -18.580651 -4.993309 0.476264 50.451399 16.441620
UCFWUUZA 1120 2022 1971 1120 170 27 0.368554 4.800397 0.646030 0.305244 12.744310 5.826267
UDGGUUJA 147 1267 1187 147 86 35 0.802279 2.826808 0.229904 1.096278 12.713677 9.380251
UGVEOFZA 3197 3779 3975 3195 120 46 0.006706 5.291207 0.118463 0.377294 14.618042 6.757983
US5EOFJA 24 3709 3470 24 144 20 4.153900 10.626738 3.201533 0.838616 13.453625 7.204844
UYAUOFRA 3331 3865 4020 3331 130 54 0.020214 7.298169 -0.183502 0.303465 13.978469 6.302833
V4BEOFRA 3098 3896 4125 3098 114 61 0.141195 6.044309 0.220349 0.359349 13.908064 6.305582
VQLGUUZA 0 2051 1601 0 196 127 0.000000 7.752484 6.051015 0.000000 12.005806 6.801884
VXZUOFRA 401 2445 287 401 60 22 -0.201375 -83.007805 -50.513255 0.328999 23.854896 16.230487
WDEUOFRA 2939 3672 3726 2939 145 77 0.133252 5.922267 0.262603 0.302583 13.568951 6.723526
WJVKYLZA 3682 3850 4093 3681 185 72 -0.062159 5.810819 -0.085540 0.288124 12.768307 6.056380
WKDUOFBA 2826 3356 3434 2826 93 80 -0.000088 7.439736 0.374299 0.346977 13.008775 6.450107
WWJWUUJA 996 1658 1607 996 130 55 0.105434 3.865156 0.145833 0.480233 13.382113 7.396989
XNCUOFBA 2422 3892 4130 2421 163 139 -0.083952 6.349024 -0.131657 0.352473 13.734155 6.145830
XU4UOFBA 2 4217 2568 2 128 23 0.113263 -34.719753 -10.838744 4.122003 15.830600 9.330653
XWGY0OZA 3265 4160 4327 3264 142 68 0.015793 5.896897 0.053848 0.297283 14.039194 6.493360
XZYUOGZA 2437 3593 3554 2436 184 46 0.015395 6.346534 0.197028 0.345826 14.135367 6.240540
YAVUOGRA 2993 4065 4143 2993 165 78 0.020215 4.000832 -0.447883 0.313856 12.536133 6.736465
Z3NGU1JA 3 2017 1156 3 2017 1156 1.871626 -47.779098 -7.932669 1.738472 40.146500 25.458330
ZGUUOGRA 24 3999 3602 24 143 25 4.540019 12.461936 3.483806 0.891360 15.000933 6.975899
ZJBUOGJA 3127 4069 4047 3126 195 187 0.109929 6.236738 -0.099783 0.422924 13.549590 6.627648
ZMTEOGRA 2460 3525 3467 2460 147 47 -0.062396 1.592716 0.613169 0.443549 12.140789 6.764789
ZS4UOGBA 2774 3329 3435 2774 117 49 0.387736 6.672724 0.441575 0.348538 12.938087 6.057075
