To help understand if the RASP forecast is matching the real world, an experimental script has been put together that will compare a RASP 'spot' forecast against a METAR observation (a real-world airfield met observation).
These observations are produced hourly or so.
The following table is a summary for the UK, using the script outlined below the table and map. The table is produced from 09:00 to 18:00 on the hour and every half hour during UK daylight hours.
The following plot will show a running view of the percentage of measures as correct between the forecast and the RASP prediction. Normally for the whole of the UK, 85% or higher indicates RASP is close enough and can be relied upon.
This report: 17:42:51 19/04/2024 for this map view. This run created in 108.84 secs
| Mark | Location | Time RASP METAR | Dry Temp ° C RASP METAR | Diff ° C | Dew Pt ° C RASP METAR | Diff ° C | Cloud Base ft RASP METAR | Diff ft | Pressure mb RASP METAR | Diff mb | Wind Dir ° RASP METAR | Diff ° | Wind Speed kts RASP METAR | Diff kts | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| A | RAF Wattisham 52.1239N 0.9573W |
|
| 1.02 |
| -1.47 |
| 655 |
| -0.2 |
| 10 |
| 0 | ||||||||||||||
| B | Cambridge A/P 52.2050N 0.1750W |
|
| 1.03 |
| -0.79 |
| 381 |
| 0.1 |
| 18 |
| 3 | ||||||||||||||
| D | RAF Cosford 52.6400N -2.3056E |
|
| -10.67 |
| -3.67 |
| -3285 |
| -1020.3 |
| 10 |
| -1 | ||||||||||||||
| RAF Culdrose 50.0843N -5.2571E |
|
| 0.31 |
| -1.34 |
| 436 |
| -1.6 |
| 2 |
| 0 | |||||||||||||||
| F | Exeter A/P 50.7372N -3.4058E |
|
| 0.86 |
| 1.1 |
| -410 |
| -0.4 |
| 17 |
| -1 | ||||||||||||||
| RAF Odiham 51.2391N -0.9450E |
|
| 2.7 |
| 0.11 |
| 493 |
| -0.8 |
| 13 |
| 1 | |||||||||||||||
| I | RAF Wittering 52.6114N -0.4612E |
|
| 0.4 |
| -0.08 |
| -264 |
| -0.6 |
| 8 |
| -5 | ||||||||||||||
| RAF Fairford 51.68135N -1.79109E |
|
| 2.92 |
| -0.29 |
| 701 |
| -1.2 |
| 15 |
| -3 | |||||||||||||||
| J | RAF Shawbury 52.7947N -2.6647E |
|
| 1.4 |
| 0.28 |
| 75 |
| -1 |
| 19 |
| 0 | ||||||||||||||
| K | RAF Benson 51.6203N -1.0987E |
|
| 0.52 |
| 0.79 |
| -561 |
| -0.9 |
| 18 |
| 1 | ||||||||||||||
| L | Cambel Town 55.4372N -5.6864E |
|
| 3.42 |
| 2.19 |
| 302 |
| -1.3 |
| 30 |
| -3 | ||||||||||||||
| M | RAF Valley 53.2527N -4.5365E |
|
| 2.08 |
| -0.23 |
| 801 |
| -1.3 |
| 12 |
| 1 | ||||||||||||||
| N | Lydd A/P 50.9561N 0.9392W |
|
| 1.55 |
| 1.94 |
| -382 |
| 0.1 |
| 2 |
| 4 | ||||||||||||||
| O | Dundee A/P 56.4525N -3.0258E |
|
| 3.11 |
| -4.52 |
| 1954 |
| -0.2 |
| 5 |
| -3 | ||||||||||||||
| P | RAF Kinloss 57.6456N -3.5635E |
|
| 1.03 |
| -0.54 |
| 477 |
| -0.2 |
| 22 |
| 1 | ||||||||||||||
| Q | Norwich A/P 52.6333N 1.3000W |
|
| 1.33 |
| 0.38 |
| 413 |
| 0 |
| 11 |
| 2 | ||||||||||||||
| S | Luton A/P 51.8747N -0.3683E |
|
| -0.78 |
| 0.97 |
| -1287 |
| 0.3 |
| 10 |
| -5 | ||||||||||||||
| T | Cardiff Intl A/P 51.3967N -3.3433E |
|
| 1.77 |
| 1.34 |
| -188 |
| -0.9 |
| 5 |
| -1 | ||||||||||||||
| U | Newcastle A/P 55.0375N -1.6917E |
|
| 0.36 |
| 0.04 |
| -263 |
| -0.6 |
| 8 |
| 3 | ||||||||||||||
| V | Belfast / Aldergrove A/P 54.6633N -6.2258E |
|
| 1.21 |
| -0.32 |
| 185 |
| -1.6 |
| 2 |
| 1 | ||||||||||||||
| W | Manchester A/P 53.3537N -2.2750E |
|
| -0.4 |
| 2.77 |
| -1783 |
| -0.3 |
| 9 |
| -5 | ||||||||||||||
| X | Glasgow A/P 55.8719N -4.4331E |
|
| 1.68 |
| -1.36 |
| 659 |
| -0.4 |
| 35 |
| 1 | ||||||||||||||
| Y | Edinburgh A/P 55.9500N -3.3500E |
|
| 0.9 |
| -1.43 |
| 641 |
| -0.2 |
| 24 |
| -4 | ||||||||||||||
| Z | Heathrow A/P 51.4775N -0.4614E |
|
| -0.05 |
| -1.9 |
| 495 |
| 0.4 |
| 18 |
| -3 | ||||||||||||||
| 1 | Southampton A/P 50.9499N -1.3585E |
|
| 2.2 |
| 1.4 |
| 331 |
| -1.1 |
| 10 |
| -1 | ||||||||||||||
| 2 | Leeds A/P 53.8618N -1.6653E |
|
| 1.24 |
| -2.88 |
| 1038 |
| -1.7 |
| 3 |
| 0 | ||||||||||||||
| 3 | Dublin A/P 53.4215N -6.2977E |
|
| 0.47 |
| 1.59 |
| -751 |
| -1.1 |
| 4 |
| -3 | ||||||||||||||
| Stornaway A/P 58.2156N -6.3311E |
|
| 0.05 |
| 1.85 |
| -856 |
| -0.5 |
| 84 |
| 0 | |||||||||||||||
| 4 | Tiree 56.5000N -6.8828E |
|
| 1.54 |
| 2.55 |
| -435 |
| -1.1 |
| 19 |
| 1 | ||||||||||||||
| 5 | Benbecula 57.4811N -7.3628E |
|
| 2.61 |
| 0.88 |
| 438 |
| -1.1 |
| 10 |
| 0 | ||||||||||||||
| 6 | Ronaldsway A/P 54.0853N -4.6320E |
|
| 1.8 |
| -0.77 |
| 675 |
| -1.2 |
| 5 |
| 0 | ||||||||||||||
| RAF Boulmer 55.4209N -1.6012E |
|
| 1.45 |
| -0.42 |
| 458 |
| -0.8 |
| 8 |
| -7 | |||||||||||||||
| Aberdeen A/P 57.2049N -2.2053E |
|
| 2.23 |
| 0.57 |
| 342 |
| -0.8 |
| 1 |
| 4 | |||||||||||||||
| Birmingham A/P 52.4602N -1.7576E |
|
| -0.41 |
| 1.57 |
| -1259 |
| -0.8 |
| 24 |
| 5 | |||||||||||||||
| Humberside A/P 53.5744N -0.3508E |
|
| 2.28 |
| 2.64 |
| -459 |
| -0.1 |
| 24 |
| -2 | |||||||||||||||
| Staverton A/P 51.8923N -2.1608E |
|
| 2.33 |
| -0.85 |
| 811 |
| -1.1 |
| 3 |
| 0 | |||||||||||||||
| Islay A/P 55.6814N -6.2498E |
|
| 2.18 |
| -0.4 |
| 849 |
| -1.7 |
| 8 |
| 3 | |||||||||||||||
| Eglinton A/P 55.0428N -7.1611E |
|
| 0.82 |
| 2.2 |
| -842 |
| -1.3 |
| 2 |
| 2 | |||||||||||||||
| Southend A/P 51.5714N 0.6956W |
|
| 0.27 |
| -1.14 |
| 637 |
| -0.3 |
| 1 |
| 1 | |||||||||||||||
| Biggin Hill A/P 51.3308N 0.0325W |
|
| -1.21 |
| 1.13 |
| -1670 |
| 1 |
| 8 |
| -1 | |||||||||||||||
| London City A/P 51.5053N 0.0553W |
|
| -0.26 |
| 1.27 |
| -662 |
| 0.6 |
| 4 |
| -3 | |||||||||||||||
| East Midlands A/P 52.8311N -1.3281E |
|
| 0.78 |
| -2.12 |
| 712 |
| -0.9 |
| 3 |
| -5 | |||||||||||||||
| Liverpool A/P 53.3340N -2.8500E |
|
| 1.7 |
| -1.12 |
| 636 |
| -0.2 |
| 13 |
| 0 | |||||||||||||||
| Wick A/P 58.4589N -3.0931E |
|
| 0.35 |
| -1.48 |
| 610 |
| -0.7 |
| 13 |
| 3 | |||||||||||||||
| 7 | Pembrey Sands Stn 51.7144N -4.3675E |
|
| 1.3 |
| -0.8 |
| 555 |
| -0.6 |
| 3 |
| 0 | ||||||||||||||
| 0 | RNAS Yeovilton 51.0063N -2.6428E |
|
| 2.97 |
| 0.52 |
| 635 |
| -1.2 |
| 1 |
| 6 |
| Table Averages |
|---|
| Difference Averages: Dry: 0.97° C - Wet: 0° C - Wind Speed: -0.28 Knots (RASP High) - Wind Deviation: 12.5 Degrees - Pressure: -22.8 mb - Cloudbase: 44 ft Difference calculations based on actual minus the forecast. Averages that are greater than +/- 2 Celcius indicates forecast widely differs from actuals. |
| Table Key |
|---|
| Highlight thresholds: Wind is 30° - Wind Speed is 7 kts - Temperature is 3° C - Cloudbase is 1500 feet - Pressure is 1.6 mb (not reported upon) |
| Notes and Observations |
|---|
| EGNC (C) Carlisle A/P - METAR report more than six hours old (36314 hours) for EGNC - report not usable. |
| EGCN () Doncaster A/P - METAR report more than six hours old (12887 hours) for EGCN - report not usable. |
The script is a bit slow, so sometimes the results may not be available as an auto-generated static view.
If this happens, click here to dynamically re-generate the table as a separate page.
If there is a problem with the output, click here to get a copy of the last generated text table.