Raw model output on the native 0.25° grid — no MOS, no bias correction, no post-processing. Scores understate operational forecast quality. Read the fairness statement →

CastCheck methodology v0.2 · data through 2026-08-30

Atlanta Hartsfield · Pangu-Weather (IFS init) · lead day 0

KATL · pangu_ifs · lead 0

Target day = initialization date + 0 days. This page is a permanent link: the numbers change as history accumulates, the address and the methodology version do not.

Scores use the latest model version segment, PANG_v100, starting 2026-08-28 — days before that ran a different version of the model and are excluded rather than silently pooled. Of the scored days, 1 carry a QC flag on the observation.

JSON for this page CSV of the daily errors Cite this page

Every number for this combination

All four windows × both initializations × both interpolations × both variables. Errors are computed in °C and shown in °F; CI is a 95 % moving-block bootstrap interval. MAE debiased and skill, debiased remove the constant offset of the window first, so a station that the model always reads a degree too warm is not scored as if it had no skill — compare the two skill columns to see how much of the error is a fixed offset. n QC next to n counts days whose observation carries a QC flag.

VariableInitMethod Windown MAE °F MAE debiased Bias °F RMSE °F ±1 °F±2 °F±3 °F Skill Skill, debiased Period
tmax00Zbilinear30d3 1 QC3.28 [2.35, 5.13]1.23-3.28 [-5.13, -2.35]3.53 [2.35, 5.13]0% [0%, 0%]0%67%——2026-08-28 → 2026-08-30
tmax00Zbilinear90d3 1 QC3.28 [2.35, 5.13]1.23-3.28 [-5.13, -2.35]3.53 [2.35, 5.13]0% [0%, 0%]0%67%——2026-08-28 → 2026-08-30
tmax00Zbilinear365d3 1 QC3.28 [2.35, 5.13]1.23-3.28 [-5.13, -2.35]3.53 [2.35, 5.13]0% [0%, 0%]0%67%——2026-08-28 → 2026-08-30
tmax00Zbilinearall3 1 QC3.28 [2.35, 5.13]1.23-3.28 [-5.13, -2.35]3.53 [2.35, 5.13]0% [0%, 0%]0%67%——2026-08-28 → 2026-08-30
tmax00Znearest30d3 1 QC3.29 [2.35, 5.10]1.20-3.29 [-5.10, -2.35]3.53 [2.35, 5.10]0% [0%, 0%]0%67%——2026-08-28 → 2026-08-30
tmax00Znearest90d3 1 QC3.29 [2.35, 5.10]1.20-3.29 [-5.10, -2.35]3.53 [2.35, 5.10]0% [0%, 0%]0%67%——2026-08-28 → 2026-08-30
tmax00Znearest365d3 1 QC3.29 [2.35, 5.10]1.20-3.29 [-5.10, -2.35]3.53 [2.35, 5.10]0% [0%, 0%]0%67%——2026-08-28 → 2026-08-30
tmax00Znearestall3 1 QC3.29 [2.35, 5.10]1.20-3.29 [-5.10, -2.35]3.53 [2.35, 5.10]0% [0%, 0%]0%67%——2026-08-28 → 2026-08-30
tmin00Zbilinear30d3 1 QC1.45 [0.75, 1.80]0.50-1.45 [-1.80, -0.75]1.57 [0.75, 1.85]33% [0%, 100%]67%100%——2026-08-28 → 2026-08-30
tmin00Zbilinear90d3 1 QC1.45 [0.75, 1.80]0.50-1.45 [-1.80, -0.75]1.57 [0.75, 1.85]33% [0%, 100%]67%100%——2026-08-28 → 2026-08-30
tmin00Zbilinear365d3 1 QC1.45 [0.75, 1.80]0.50-1.45 [-1.80, -0.75]1.57 [0.75, 1.85]33% [0%, 100%]67%100%——2026-08-28 → 2026-08-30
tmin00Zbilinearall3 1 QC1.45 [0.75, 1.80]0.50-1.45 [-1.80, -0.75]1.57 [0.75, 1.85]33% [0%, 100%]67%100%——2026-08-28 → 2026-08-30
tmin00Znearest30d3 1 QC1.44 [0.67, 1.82]0.53-1.44 [-1.82, -0.67]1.57 [0.67, 1.87]33% [0%, 100%]67%100%——2026-08-28 → 2026-08-30
tmin00Znearest90d3 1 QC1.44 [0.67, 1.82]0.53-1.44 [-1.82, -0.67]1.57 [0.67, 1.87]33% [0%, 100%]67%100%——2026-08-28 → 2026-08-30
tmin00Znearest365d3 1 QC1.44 [0.67, 1.82]0.53-1.44 [-1.82, -0.67]1.57 [0.67, 1.87]33% [0%, 100%]67%100%——2026-08-28 → 2026-08-30
tmin00Znearestall3 1 QC1.44 [0.67, 1.82]0.53-1.44 [-1.82, -0.67]1.57 [0.67, 1.87]33% [0%, 100%]67%100%——2026-08-28 → 2026-08-30

+ model too warm · − model too cold · bias interval includes zero · ★ lowest MAE · = not distinguishable from the leader · ▼ significantly worse · n < 30 greyed and unranked · CI is a 95 % moving-block bootstrap interval.

Daily error, last 90 days

Daily forecast minus observed error in °F for Pangu-Weather (IFS init) at KATL, lead day 0, 00Z bilinear tmax+10+50-5-102026-08-28: -5.13 °F2026-08-29: -2.36 °F2026-08-30: -2.35 °F2026-08-282026-08-30°F, forecast − observed
Forecast − observed, °F, 00Z bilinear daily maximum. The dashed line is zero; the thick line is a centred 7-day mean, drawn only where the whole window is present. Gaps are days with no score, never interpolation. Hover a point for its date and value.
The same series as a table (3 days, newest first) · download CSV
Climatological dayError °F
2026-08-30-2.35
2026-08-29-2.36
2026-08-28-5.13

Error distribution

Distribution of the signed daily error in °F for Pangu-Weather (IFS init) at KATL, lead day 0-10 to -9 °F: 0 days-9 to -8 °F: 0 days-8 to -7 °F: 0 days-7 to -6 °F: 0 days-6 to -5 °F: 1 day-5 to -4 °F: 0 days-4 to -3 °F: 0 days-3 to -2 °F: 2 days-2 to -1 °F: 0 days-1 to 0 °F: 0 days0 to 1 °F: 0 days1 to 2 °F: 0 days2 to 3 °F: 0 days3 to 4 °F: 0 days4 to 5 °F: 0 days5 to 6 °F: 0 days6 to 7 °F: 0 days7 to 8 °F: 0 days8 to 9 °F: 0 days9 to 10 °F: 0 daysdashed: P50 |e| 2.36 · P90 |e| 4.57 °F-100+10 °Fn = 3 days
All scored days for 00Z bilinear daily maximum, 20 equal bins. The dashed marks are the 50th and 90th percentiles of the absolute error, mirrored on both sides. Hover a bar for its bin and count.
Bin counts as a table
From °FTo °FDays
-10.00-9.000
-9.00-8.000
-8.00-7.000
-7.00-6.000
-6.00-5.001
-5.00-4.000
-4.00-3.000
-3.00-2.002
-2.00-1.000
-1.00+0.000
+0.00+1.000
+1.00+2.000
+2.00+3.000
+3.00+4.000
+4.00+5.000
+5.00+6.000
+6.00+7.000
+7.00+8.000
+8.00+9.000
+9.00+10.000

Month by month

00Z bilinear daily maximum, newest first.

Monthn MAE °FBias °F
2026-0833.28 -3.28

Availability

ModelScored period DaysCoverage
Pangu-Weather (IFS init)2026-08-28 → 2026-08-30 3
Pangu-Weather (IFS init)2026-08-28 → 2026-08-30 3

Compared with other models

Paired bootstrap on the days both models cover (90d, 00Z, bilinear, daily maximum). Negative means Pangu-Weather (IFS init) has the lower MAE. "Distinguishable" means the 95 % interval excludes zero.

Other modelCommon days MAE difference °FDistinguishable
ECMWF AIFS Single 3 -1.08 [-1.40, -0.45] yes
Aurora (GFS init) 2 -4.24 [-4.35, -4.13] yes
Aurora (IFS init) 3 -3.41 [-3.60, -3.02] yes
FourCastNet v2 (GFS init) 2 -1.32 [-1.61, -1.03] yes
FourCastNet v2 (IFS init) 3 -1.16 [-2.12, -0.35] yes
NCEP GFS 3 +1.91 [1.80, 2.12] yes
GraphCast (GFS init) 2 -2.69 [-3.12, -2.25] yes
GraphCast (IFS init) 3 -2.90 [-3.25, -2.20] yes
ECMWF IFS HRES 3 -0.44 [-0.85, 0.13] no
Pangu-Weather (GFS init) 2 -0.14 [-0.34, 0.06] no

Cite this page

ShortCastCheck, KATL pangu_ifs lead 0, methodology v0.2, accessed 2026-08-31, https://castcheck.zifanzhang.com/station/KATL/model/pangu_ifs/lead/0/

LongCastCheck (2026). Station-level verification of raw weather-model 2 m temperature forecasts: KATL (Atlanta Hartsfield), model pangu_ifs, lead day 0. Methodology version 0.2, schema version 0.1, data through 2026-08-30. Accessed 2026-08-31. https://castcheck.zifanzhang.com/station/KATL/model/pangu_ifs/lead/0/

Accessed2026-08-31 (data through 2026-08-30; page built 2026-08-31T03:52:06+00:00)

JSON CSV all scores methodology v0.2 licence