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

Dallas-Fort Worth · GraphCast (GFS init) · lead day 0

KDFW · graphcast_gfs · 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, GRAP_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
tmax00Zbilinear30d2 1 QC4.86 [4.71, 5.01]0.15-4.86 [-5.01, -4.71]4.86 [4.71, 5.01]0% [0%, 0%]0%0%——2026-08-29 → 2026-08-30
tmax00Zbilinear90d2 1 QC4.86 [4.71, 5.01]0.15-4.86 [-5.01, -4.71]4.86 [4.71, 5.01]0% [0%, 0%]0%0%——2026-08-29 → 2026-08-30
tmax00Zbilinear365d2 1 QC4.86 [4.71, 5.01]0.15-4.86 [-5.01, -4.71]4.86 [4.71, 5.01]0% [0%, 0%]0%0%——2026-08-29 → 2026-08-30
tmax00Zbilinearall2 1 QC4.86 [4.71, 5.01]0.15-4.86 [-5.01, -4.71]4.86 [4.71, 5.01]0% [0%, 0%]0%0%——2026-08-29 → 2026-08-30
tmax00Znearest30d2 1 QC5.09 [4.96, 5.22]0.13-5.09 [-5.22, -4.96]5.09 [4.96, 5.22]0% [0%, 0%]0%0%——2026-08-29 → 2026-08-30
tmax00Znearest90d2 1 QC5.09 [4.96, 5.22]0.13-5.09 [-5.22, -4.96]5.09 [4.96, 5.22]0% [0%, 0%]0%0%——2026-08-29 → 2026-08-30
tmax00Znearest365d2 1 QC5.09 [4.96, 5.22]0.13-5.09 [-5.22, -4.96]5.09 [4.96, 5.22]0% [0%, 0%]0%0%——2026-08-29 → 2026-08-30
tmax00Znearestall2 1 QC5.09 [4.96, 5.22]0.13-5.09 [-5.22, -4.96]5.09 [4.96, 5.22]0% [0%, 0%]0%0%——2026-08-29 → 2026-08-30
tmin00Zbilinear30d2 1 QC2.50 [1.91, 3.09]0.59+2.50 [1.91, 3.09]2.57 [1.91, 3.09]0% [0%, 0%]50%50%——2026-08-29 → 2026-08-30
tmin00Zbilinear90d2 1 QC2.50 [1.91, 3.09]0.59+2.50 [1.91, 3.09]2.57 [1.91, 3.09]0% [0%, 0%]50%50%——2026-08-29 → 2026-08-30
tmin00Zbilinear365d2 1 QC2.50 [1.91, 3.09]0.59+2.50 [1.91, 3.09]2.57 [1.91, 3.09]0% [0%, 0%]50%50%——2026-08-29 → 2026-08-30
tmin00Zbilinearall2 1 QC2.50 [1.91, 3.09]0.59+2.50 [1.91, 3.09]2.57 [1.91, 3.09]0% [0%, 0%]50%50%——2026-08-29 → 2026-08-30
tmin00Znearest30d2 1 QC2.72 [2.02, 3.42]0.70+2.72 [2.02, 3.42]2.81 [2.02, 3.42]0% [0%, 0%]0%50%——2026-08-29 → 2026-08-30
tmin00Znearest90d2 1 QC2.72 [2.02, 3.42]0.70+2.72 [2.02, 3.42]2.81 [2.02, 3.42]0% [0%, 0%]0%50%——2026-08-29 → 2026-08-30
tmin00Znearest365d2 1 QC2.72 [2.02, 3.42]0.70+2.72 [2.02, 3.42]2.81 [2.02, 3.42]0% [0%, 0%]0%50%——2026-08-29 → 2026-08-30
tmin00Znearestall2 1 QC2.72 [2.02, 3.42]0.70+2.72 [2.02, 3.42]2.81 [2.02, 3.42]0% [0%, 0%]0%50%——2026-08-29 → 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 GraphCast (GFS init) at KDFW, lead day 0, 00Z bilinear tmax+10+50-5-102026-08-29: -5.01 °F2026-08-30: -4.71 °F2026-08-292026-08-30°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 (2 days, newest first) · download CSV
Climatological dayError °F
2026-08-30-4.71
2026-08-29-5.01

Error distribution

Distribution of the signed daily error in °F for GraphCast (GFS init) at KDFW, 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: 1 day-4 to -3 °F: 0 days-3 to -2 °F: 0 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| 4.86 · P90 |e| 4.98 °F-100+10 °Fn = 2 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
-5.00-4.001
-4.00-3.000
-3.00-2.000
-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
2026-0824.86 -4.86

Availability

ModelScored period DaysCoverage
GraphCast (GFS init)2026-08-29 → 2026-08-30 2
GraphCast (GFS init)2026-08-29 → 2026-08-30 2

Compared with other models

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

Other modelCommon days MAE difference °FDistinguishable
ECMWF AIFS Single 2 +2.24 [1.62, 2.87] yes
Aurora (GFS init) 2 +0.17 [-0.62, 0.97] no
Aurora (IFS init) 2 -0.25 [-0.95, 0.45] no
FourCastNet v2 (GFS init) 2 +0.91 [0.65, 1.16] yes
FourCastNet v2 (IFS init) 2 -0.15 [-0.95, 0.64] no
NCEP GFS 2 +3.83 [3.57, 4.08] yes
GraphCast (IFS init) 2 +0.47 [0.23, 0.71] yes
ECMWF IFS HRES 2 +2.15 [1.39, 2.90] yes
Pangu-Weather (GFS init) 2 +2.60 [2.12, 3.08] yes
Pangu-Weather (IFS init) 2 +0.99 [0.26, 1.72] yes

Cite this page

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

LongCastCheck (2026). Station-level verification of raw weather-model 2 m temperature forecasts: KDFW (Dallas-Fort Worth), model graphcast_gfs, 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/KDFW/model/graphcast_gfs/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