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.

A spatial map of the reports can be found here.


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: 17:42:09 28/07/2021 for this map view. This run created in 67.42 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
1700
1650
18.36
17
-1.36
11.74
13
1.26
2885
1600
-1285
1005.6
1005
-0.6
224
230
6
21
13
-8
BCambridge A/P
52.2050N 0.1750W
1730
1720
19.41
20
0.59
10.91
11
0.09
3770
3600
-170
1004.6
1004
-0.6
236
220
16
18
13
-5
RAF Culdrose
50.0843N -5.2571E
1730
1722
16.69
18
1.31
10.36
12
1.64
2811
2400
-411
1011.5
1011
-0.5
276
250
26
19
20
1
FExeter A/P
50.7372N -3.4058E
1730
1720
17.58
20
2.42
10.55
11
0.45
3106
3600
494
1009.1
1008
-1.1
266
260
6
18
15
-3
RAF Odiham
51.2391N -0.9450E
1730
1722
16.57
16
-0.57
12.34
14
1.66
2175
800
-1375
1007.5
1007
-0.5
253
230
23
19
13
-6
IRAF Wittering
52.6114N -0.4612E
1700
1650
15.81
19
3.19
11.46
11
-0.46
2087
3200
1113
1004.4
1003
-1.4
240
240
0
20
16
-4
RAF Fairford
51.68135N -1.79109E
1700
1656
18.45
20
1.55
10.16
11
0.84
3659
3600
-59
1006.3
1005
-1.3
255
250
5
26
21
-5
JRAF Shawbury
52.7947N -2.6647E
1700
1650
17.17
18
0.83
8.38
8
-0.38
3818
4000
182
1004.4
1003
-1.4
256
280
24
23
17
-6
KRAF Benson
51.6203N -1.0987E
1730
1720
18.65
19
0.35
9.87
13
3.13
3896
2400
-1496
1006.6
1006
-0.6
250
210
40
22
14
-8
LCambel Town
55.4372N -5.6864E
1730
1720
14.40
16
1.6
11.44
13
1.56
1355
1200
-155
1001.2
1000
-1.2
267
260
7
14
13
-1
MRAF Valley
53.2527N -4.5365E
1730
1726
16.09
15
-1.09
9.84
10
0.16
2559
2000
-559
1004.3
1004
-0.3
253
250
3
20
12
-8
NLydd A/P
50.9561N 0.9392W
1730
1720
17.68
19
1.32
13.24
14
0.76
1727
2000
273
1009.0
1009
0
236
230
6
26
27
1
ODundee A/P
56.4525N -3.0258E
1730
1720
15.78
19
3.22
12.29
13
0.71
1919
2400
481
998.5
998
-0.5
248
250
2
15
9
-6
PRAF Kinloss
57.6456N -3.5635E
1700
1650
16.71
18
1.29
15.49
14
-1.49
581
1600
1019
997.9
997
-0.9
65
060
5
17
12
-5
QNorwich A/P
52.6333N 1.3000W
1730
1720
17.04
18
0.96
11.47
15
3.53
2275
1200
-1075
1004.8
1004
-0.8
310
200
110
10
8
-2
SLuton A/P
51.8747N -0.3683E
1730
1720
19.02
17
-2.02
9.26
11
1.74
4492
2400
-2092
1005.7
1005
-0.7
244
220
24
23
17
-6
TCardiff Intl A/P
51.3967N -3.3433E
1730
1720
16.64
17
0.36
11.13
12
0.87
2434
2000
-434
1008.1
1007
-1.1
272
280
8
25
15
-10
UNewcastle A/P
55.0375N -1.6917E
1730
1720
17.35
18
0.65
10.78
10
-0.78
3097
3200
103
1000.1
1000
-0.1
264
240
24
13
9
-4
VBelfast / Aldergrove A/P
54.6633N -6.2258E
1730
1720
12.44
14
1.56
11.27
13
1.73
737
400
-337
1001.6
1002
0.4
33
270
123
5
7
2
WManchester A/P
53.3537N -2.2750E
1730
1720
14.78
16
1.22
11.53
12
0.47
1620
1600
-20
1003.9
1003
-0.9
265
250
15
14
5
-9
XGlasgow A/P
55.8719N -4.4331E
1730
1720
16.39
17
0.61
10.72
11
0.28
2465
2400
-65
999.7
999
-0.7
269
280
11
12
10
-2
YEdinburgh A/P
55.9500N -3.3500E
1730
1720
17.75
18
0.25
10.02
11
0.98
3369
2800
-569
999.2
998
-1.2
258
270
12
14
10
-4
ZHeathrow A/P
51.4775N -0.4614E
1730
1720
17.70
17
-0.7
13.15
14
0.85
2089
1200
-889
1007.0
1007
0
251
240
11
18
9
-9
1Southampton A/P
50.9499N -1.3585E
1730
1720
18.80
19
0.2
10.71
12
1.29
3266
2800
-466
1008.1
1007
-1.1
239
230
9
23
18
-5
2Leeds A/P
53.8618N -1.6653E
1730
1720
11.94
13
1.06
8.47
11
2.53
2072
800
-1272
1003.1
1002
-1.1
265
250
15
26
4
-22
3Dublin A/P
53.4215N -6.2977E
1730
1730
15.47
15
-0.47
8.08
9
0.92
3299
2400
-899
1004.1
1004
-0.1
272
260
12
23
14
-9
Stornaway A/P
58.2156N -6.3311E
1730
1720
14.26
14
-0.26
12.98
13
0.02
607
400
-207
999.6
1000
0.4
34
040
6
25
17
-8
4Tiree
56.5000N -6.8828E
1730
1720
15.49
15
-0.49
13.19
13
-0.19
993
800
-193
997.7
998
0.3
307
310
3
15
9
-6
5Benbecula
57.4811N -7.3628E
1730
1720
14.75
17
2.25
14.02
14
-0.02
357
1200
843
998.5
999
0.5
64
070
6
20
13
-7
6Ronaldsway A/P
54.0853N -4.6320E
1700
1650
13.83
15
1.17
12.54
11
-1.54
662
1600
938
1002.1
1001
-1.1
254
270
16
16
13
-3
RAF Boulmer
55.4209N -1.6012E
1700
1650
17.57
20
2.43
11.76
10
-1.76
3000
4000
1000
999.5
998
-1.5
218
210
8
13
16
3
Aberdeen A/P
57.2049N -2.2053E
1730
1720
17.27
17
-0.27
12.86
15
2.14
2068
800
-1268
998.0
998
0
123
120
3
9
6
-3
Birmingham A/P
52.4602N -1.7576E
1730
1720
16.78
13
-3.78
10.70
12
1.3
3078
400
-2678
1004.7
1004
-0.7
242
190
52
15
8
-7
Humberside A/P
53.5744N -0.3508E
1730
1720
13.40
15
1.6
10.81
11
0.19
1236
1600
364
1003.6
1002
-1.6
283
300
17
15
13
-2
Staverton A/P
51.8923N -2.1608E
1730
1720
19.11
20
0.89
8.91
12
3.09
4270
3200
-1070
1006.1
1005
-1.1
254
250
4
22
13
-9
Islay A/P
55.6814N -6.2498E
1730
1720
14.19
15
0.81
12.42
12
-0.42
831
1200
369
1000.7
1000
-0.7
291
290
1
13
13
0
Eglinton A/P
55.0428N -7.1611E
1730
1720
14.14
16
1.86
11.86
13
1.14
1112
1200
88
1002.4
1002
-0.4
285
290
5
13
12
-1
Southend A/P
51.5714N 0.6956W
1730
1720
16.34
19
2.66
11.47
13
1.53
1981
2400
419
1007.2
1006
-1.2
262
220
42
17
11
-6
Biggin Hill A/P
51.3308N 0.0325W
1730
1720
17.45
17
-0.45
11.93
11
-0.93
2877
2400
-477
1007.2
1007
-0.2
238
220
18
20
17
-3
London City A/P
51.5053N 0.0553W
1730
1720
17.17
16
-1.17
10.98
13
2.02
2550
1200
-1350
1007.1
1007
-0.1
240
230
10
17
6
-11
East Midlands A/P
52.8311N -1.3281E
1730
1720
17.61
17
-0.61
10.11
10
-0.11
3257
2800
-457
1004.0
1003
-1
232
220
12
20
13
-7
Doncaster A/P
53.4747N -1.0044E
1730
1720
13.72
15
1.28
11.34
12
0.66
1053
1200
147
1003.4
1004
0.6
261
VRB
0
6
3
-3
Liverpool A/P
53.3340N -2.8500E
1730
1720
16.09
17
0.91
11.60
11
-0.6
2176
2400
224
1003.9
1003
-0.9
272
250
22
21
11
-10
Wick A/P
58.4589N -3.0931E
1730
1720
14.04
13
-1.04
13.37
13
-0.37
291
0
-291
999.8
999
-0.8
49
030
19
13
10
-3
0RNAS Yeovilton
51.0063N -2.6428E
1730
1720
18.49
19
0.51
10.00
9
-1
3606
4000
394
1008.4
1007
-1.4
268
260
8
22
16
-6


Table Averages
Difference Averages: Dry: 0.59° C - Wet: 0.66° C - Wind Speed: -5.22 Knots (RASP High) - Wind Deviation: 19.9 Degrees - Pressure: -0.6 mb - Cloudbase: -293 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 (11714 hours) for EGNC - report not usable.
EGWC (D) RAF Cosford - METAR report more than six hours old (320 hours) for EGWC - report not usable.
EGOP (7) Pembrey Sands Stn - METAR report more than six hours old (8 hours) for EGOP - 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.