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: 13:11:57 27/05/2022 for this map view. This run created in 55.85 secs

MarkLocationTime
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
ARAF Wattisham
52.1239N 0.9573W
1300
1250
15.61
17
1.39
6.25
6
-0.25
4142
4400
258
1023.8
1023
-0.8
302
300
2
15
15
0
BCambridge A/P
52.2050N 0.1750W
1300
1250
16.06
17
0.94
6.12
5
-1.12
4203
4800
597
1024.3
1024
-0.3
306
310
4
16
12
-4
RAF Culdrose
50.0843N -5.2571E
1300
1250
15.09
16
0.91
7.34
7
-0.34
3440
3600
160
1028.8
1028
-0.8
348
340
8
11
11
0
FExeter A/P
50.7372N -3.4058E
1300
1250
16.55
18
1.45
7.61
7
-0.61
3910
4400
490
1027.3
1027
-0.3
318
300
18
10
9
-1
RAF Odiham
51.2391N -0.9450E
1300
1250
15.85
16
0.15
6.40
6
-0.4
4289
4000
-289
1025.7
1025
-0.7
317
290
27
12
10
-2
IRAF Wittering
52.6114N -0.4612E
1300
1250
15.06
16
0.94
6.49
5
-1.49
3806
4400
594
1024.3
1023
-1.3
295
300
5
19
18
-1
RAF Fairford
51.68135N -1.79109E
1100
1056
13.47
15
1.53
6.05
7
0.95
3439
3200
-239
1026.0
1025
-1
306
310
4
11
10
-1
JRAF Shawbury
52.7947N -2.6647E
1300
1250
13.90
15
1.1
5.83
6
0.17
3638
3600
-38
1026.5
1026
-0.5
300
300
0
13
11
-2
KRAF Benson
51.6203N -1.0987E
1300
1250
15.52
17
1.48
5.89
6
0.11
4296
4400
104
1025.7
1025
-0.7
317
300
17
12
8
-4
LCambel Town
55.4372N -5.6864E
1300
1250
10.74
11
0.26
6.86
8
1.14
1730
1200
-530
1025.1
1025
-0.1
287
300
13
24
13
-11
MRAF Valley
53.2527N -4.5365E
1300
1250
12.58
14
1.42
6.52
6
-0.52
2554
3200
646
1027.8
1027
-0.8
274
280
6
12
17
5
NLydd A/P
50.9561N 0.9392W
1300
1250
17.01
20
2.99
4.85
12
7.15
5128
3200
-1928
1024.7
1024
-0.7
320
350
30
10
8
-2
ODundee A/P
56.4525N -3.0258E
1300
1250
12.02
16
3.98
6.70
5
-1.7
3018
4400
1382
1019.1
1018
-1.1
282
290
8
18
18
0
PRAF Kinloss
57.6456N -3.5635E
1300
1250
13.24
10
-3.24
6.39
8
1.61
2904
800
-2104
1018.2
1018
-0.2
299
310
11
22
14
-8
QNorwich A/P
52.6333N 1.3000W
1300
1250
16.13
16
-0.13
3.66
5
1.34
4953
4400
-553
1023.0
1023
0
299
280
19
16
15
-1
SLuton A/P
51.8747N -0.3683E
1300
1250
15.10
17
1.9
5.22
5
-0.22
4524
4800
276
1025.0
1024
-1
311
300
11
14
11
-3
TCardiff Intl A/P
51.3967N -3.3433E
1300
1250
13.35
15
1.65
8.56
9
0.44
2064
2400
336
1027.5
1027
-0.5
262
270
8
18
13
-5
UNewcastle A/P
55.0375N -1.6917E
1300
1250
13.81
15
1.19
6.10
4
-2.1
3474
4400
926
1021.3
1020
-1.3
289
290
1
23
18
-5
VBelfast / Aldergrove A/P
54.6633N -6.2258E
1300
1250
11.75
12
0.25
6.29
7
0.71
2571
2000
-571
1026.5
1026
-0.5
297
300
3
15
12
-3
WManchester A/P
53.3537N -2.2750E
1300
1250
11.96
14
2.04
5.94
6
0.06
2774
3200
426
1026.1
1026
-0.1
291
270
21
16
16
0
XGlasgow A/P
55.8719N -4.4331E
1300
1250
12.51
12
-0.51
6.87
6
-0.87
2458
2400
-58
1022.6
1023
0.4
283
260
23
24
15
-9
YEdinburgh A/P
55.9500N -3.3500E
1300
1250
12.69
14
1.31
5.86
5
-0.86
2995
3600
605
1021.1
1020
-1.1
278
260
18
22
15
-7
ZHeathrow A/P
51.4775N -0.4614E
1300
1250
16.17
18
1.83
6.35
5
-1.35
4267
5200
933
1025.3
1025
-0.3
313
290
23
12
9
-3
1Southampton A/P
50.9499N -1.3585E
1300
1250
16.87
18
1.13
4.16
8
3.84
5114
4000
-1114
1026.0
1025
-1
319
310
9
12
8
-4
2Leeds A/P
53.8618N -1.6653E
1300
1250
12.67
12
-0.67
6.94
5
-1.94
2856
2800
-56
1023.6
1023
-0.6
283
280
3
24
23
-1
3Dublin A/P
53.4215N -6.2977E
1400
1300
14.86
14
-0.86
7.49
7
-0.49
3315
2800
-515
1027.5
1027
-0.5
296
280
16
12
14
2
Stornaway A/P
58.2156N -6.3311E
1300
1250
11.00
12
1
7.27
8
0.73
1616
1600
-16
1020.0
1020
0
292
280
12
21
19
-2
4Tiree
56.5000N -6.8828E
1300
1250
11.24
10
-1.24
6.25
7
0.75
2080
1200
-880
1024.0
1024
0
294
300
6
23
22
-1
5Benbecula
57.4811N -7.3628E
1300
1250
10.33
13
2.67
7.57
8
0.43
1318
2000
682
1022.7
1022
-0.7
292
290
2
22
16
-6
6Ronaldsway A/P
54.0853N -4.6320E
1300
1250
11.68
14
2.32
7.47
5
-2.47
2092
3600
1508
1026.5
1026
-0.5
298
300
2
16
14
-2
RAF Boulmer
55.4209N -1.6012E
1300
1250
12.46
17
4.54
6.90
6
-0.9
2846
4400
1554
1020.1
1019
-1.1
294
280
14
25
22
-3
Aberdeen A/P
57.2049N -2.2053E
1300
1250
12.49
13
0.51
7.03
6
-1.03
2494
2800
306
1016.7
1017
0.3
326
300
26
24
18
-6
Birmingham A/P
52.4602N -1.7576E
1300
1250
15.30
16
0.7
4.68
4
-0.68
4849
4800
-49
1025.5
1025
-0.5
308
310
2
13
16
3
Humberside A/P
53.5744N -0.3508E
1300
1250
14.89
16
1.11
6.32
5
-1.32
3658
4400
742
1022.8
1023
0.2
289
270
19
21
15
-6
Staverton A/P
51.8923N -2.1608E
1300
1250
15.74
17
1.26
6.71
8
1.29
3941
3600
-341
1026.2
1026
-0.2
297
280
17
13
7
-6
Islay A/P
55.6814N -6.2498E
1300
1250
11.22
12
0.78
6.46
7
0.54
2079
2000
-79
1025.2
1025
-0.2
291
290
1
21
17
-4
Eglinton A/P
55.0428N -7.1611E
1300
1250
12.09
13
0.91
6.21
8
1.79
2568
2000
-568
1026.7
1026
-0.7
288
290
2
18
16
-2
Southend A/P
51.5714N 0.6956W
1300
1250
16.64
18
1.36
3.01
6
2.99
5458
4800
-658
1024.5
1024
-0.5
314
320
6
12
10
-2
Biggin Hill A/P
51.3308N 0.0325W
1300
1250
15.60
17
1.4
4.10
6
1.9
5359
4400
-959
1024.9
1025
0.1
312
290
22
12
9
-3
London City A/P
51.5053N 0.0553W
1300
1250
16.96
18
1.04
2.13
6
3.87
5925
4800
-1125
1024.8
1025
0.2
313
260
53
11
9
-2
East Midlands A/P
52.8311N -1.3281E
1300
1250
14.60
16
1.4
6.47
4
-2.47
3626
4800
1174
1025.0
1025
0
298
290
8
18
16
-2
Doncaster A/P
53.4747N -1.0044E
1300
1250
14.93
16
1.07
6.21
5
-1.21
3660
4400
740
1023.6
1024
0.4
293
270
23
22
17
-5
Liverpool A/P
53.3340N -2.8500E
1300
1250
11.97
16
4.03
6.95
7
0.05
2414
3600
1186
1026.6
1026
-0.6
289
280
9
19
19
0
Wick A/P
58.4589N -3.0931E
1300
1250
11.75
13
1.25
6.50
7
0.5
2204
2400
196
1016.3
1016
-0.3
305
300
5
25
21
-4
7Pembrey Sands Stn
51.7144N -4.3675E
1300
1250
14.06
16
1.94
6.97
6
-0.97
3093
4000
907
1028.2
1028
-0.2
298
310
12
7
10
3
0RNAS Yeovilton
51.0063N -2.6428E
1300
1250
15.37
16
0.63
7.80
8
0.2
3298
3200
-98
1027.1
1026
-1.1
316
280
36
11
12
1


Table Averages
Difference Averages: Dry: 1.15° C - Wet: 0.16° C - Wind Speed: -2.59 Knots (RASP High) - Wind Deviation: 12.7 Degrees - Pressure: -0.5 mb - Cloudbase: 86 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 (18981 hours) for EGNC - report not usable.
EGWC (D) RAF Cosford - METAR report more than six hours old (45 hours) for EGWC - 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.