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: 17:41:58 17/04/2021 for this map view. This run created in 57.1 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
9.68
11
1.32
-0.96
-1
-0.04
4644
4800
156
1027.1
1026
-1.1
45
050
5
10
7
-3
RAF Culdrose
50.0843N -5.2571E
1700
1650
9.20
10
0.8
2.18
1
-1.18
3079
3600
521
1027.5
1027
-0.5
143
100
43
6
8
2
FExeter A/P
50.7372N -3.4058E
1630
1620
9.71
13
3.29
1.62
1
-0.62
3497
4800
1303
1027.4
1027
-0.4
186
140
46
6
8
2
RAF Odiham
51.2391N -0.9450E
1700
1650
10.91
12
1.09
-1.77
-5
-3.23
5636
6800
1164
1026.6
1026
-0.6
38
020
18
7
6
-1
IRAF Wittering
52.6114N -0.4612E
1700
1650
10.00
11
1
-1.35
-4
-2.65
4995
6000
1005
1027.5
1027
-0.5
69
040
29
8
6
-2
RAF Fairford
51.68135N -1.79109E
1700
1656
10.95
12
1.05
0.10
-4
-4.1
4877
6400
1523
1026.9
1026
-0.9
87
000
87
3
0
-3
JRAF Shawbury
52.7947N -2.6647E
1700
1650
11.76
13
1.24
1.98
-1
-2.98
4348
5600
1252
1026.7
1026
-0.7
150
050
100
4
3
-1
KRAF Benson
51.6203N -1.0987E
1700
1650
10.81
13
2.19
-0.54
-2
-1.46
5050
6000
950
1026.8
1026
-0.8
32
360
32
6
7
1
MRAF Valley
53.2527N -4.5365E
1700
1650
8.91
11
2.09
2.61
2
-0.61
2623
3600
977
1027.3
1027
-0.3
236
240
4
5
7
2
NLydd A/P
50.9561N 0.9392W
1730
1720
7.92
11
3.08
1.49
1
-0.49
2660
4000
1340
1026.7
1027
0.3
68
070
2
13
12
-1
ODundee A/P
56.4525N -3.0258E
1600
1550
7.26
14
6.74
3.45
2
-1.45
2177
4800
2623
1026.7
1027
0.3
83
110
27
13
6
-7
PRAF Kinloss
57.6456N -3.5635E
1700
1650
11.45
12
0.55
2.01
6
3.99
3979
2400
-1579
1024.4
1024
-0.4
38
010
28
7
8
1
QNorwich A/P
52.6333N 1.3000W
1730
1720
8.06
10
1.94
-1.52
-2
-0.48
3836
4800
964
1027.7
1028
0.3
38
040
2
10
7
-3
SLuton A/P
51.8747N -0.3683E
1730
1720
10.19
12
1.81
0.29
-3
-3.29
4544
6000
1456
1026.6
1026
-0.6
31
060
29
7
5
-2
TCardiff Intl A/P
51.3967N -3.3433E
1730
1720
10.47
12
1.53
-1.55
-1
0.55
5139
5200
61
1027.0
1027
0
133
VRB
0
4
3
-1
UNewcastle A/P
55.0375N -1.6917E
1730
1720
10.03
11
0.97
1.29
1
-0.29
3878
4000
122
1027.2
1027
-0.2
116
110
6
10
10
0
VBelfast / Aldergrove A/P
54.6633N -6.2258E
1730
1720
10.37
12
1.63
3.20
1
-2.2
3282
4400
1118
1024.7
1025
0.3
165
170
5
17
14
-3
WManchester A/P
53.3537N -2.2750E
1730
1720
11.55
14
2.45
2.66
1
-1.66
3967
5200
1233
1026.7
1026
-0.7
186
VRB
0
5
3
-2
XGlasgow A/P
55.8719N -4.4331E
1730
1720
10.77
13
2.23
3.83
2
-1.83
2985
4400
1415
1026.1
1026
-0.1
225
220
5
11
11
0
YEdinburgh A/P
55.9500N -3.3500E
1730
1720
11.37
13
1.63
1.13
2
0.87
4388
4400
12
1025.9
1026
0.1
62
060
2
9
11
2
ZHeathrow A/P
51.4775N -0.4614E
1730
1720
11.75
12
0.25
-0.84
-3
-2.16
5447
6000
553
1026.4
1026
-0.4
31
VRB
0
8
3
-5
1Southampton A/P
50.9499N -1.3585E
1300
1250
10.27
12
1.73
-4.98
-3
1.98
6154
6000
-154
1028.6
1029
0.4
48
360
48
6
7
1
3Dublin A/P
53.4215N -6.2977E
1730
1730
10.71
11
0.29
3.51
3
-0.51
3290
3200
-90
1025.2
1026
0.8
174
140
34
12
12
0
Stornaway A/P
58.2156N -6.3311E
1730
1720
9.80
11
1.2
0.99
4
3.01
3709
2800
-909
1022.4
1023
0.6
185
170
15
21
15
-6
4Tiree
56.5000N -6.8828E
1730
1720
9.74
11
1.26
4.34
6
1.66
2180
2000
-180
1022.8
1023
0.2
155
160
5
24
16
-8
5Benbecula
57.4811N -7.3628E
1730
1720
8.79
11
2.21
3.88
5
1.12
2398
2400
2
1021.5
1022
0.5
161
160
1
26
20
-6
6Ronaldsway A/P
54.0853N -4.6320E
1700
1650
7.07
10
2.93
4.48
5
0.52
1194
2000
806
1027.3
1027
-0.3
167
190
23
4
5
1
RAF Boulmer
55.4209N -1.6012E
1700
1650
6.71
9
2.29
3.88
4
0.12
1348
2000
652
1027.9
1028
0.1
145
130
15
13
12
-1
Aberdeen A/P
57.2049N -2.2053E
1730
1720
8.03
9
0.97
3.05
0
-3.05
2262
3600
1338
1026.9
1026
-0.9
161
150
11
14
16
2
Birmingham A/P
52.4602N -1.7576E
1730
1720
11.15
13
1.85
-1.65
-2
-0.35
5712
6000
288
1026.7
1026
-0.7
77
110
33
4
5
1
Humberside A/P
53.5744N -0.3508E
1730
1720
8.13
11
2.87
-1.97
-1
0.97
4309
4800
491
1027.9
1028
0.1
86
080
6
10
9
-1
Staverton A/P
51.8923N -2.1608E
1600
1550
11.78
13
1.22
1.18
0
-1.18
4561
5200
639
1027.2
1027
-0.2
334
030
56
2
4
2
Islay A/P
55.6814N -6.2498E
1730
1720
8.92
10
1.08
3.99
4
0.01
2102
2400
298
1024.3
1024
-0.3
148
VRB
0
24
19
-5
Eglinton A/P
55.0428N -7.1611E
1200
1150
10.54
13
2.46
2.09
6
3.91
3604
2800
-804
1025.9
1026
0.1
180
180
0
17
13
-4
Southend A/P
51.5714N 0.6956W
1600
1550
8.48
10
1.52
0.16
-3
-3.16
3328
5200
1872
1027.5
1028
0.5
91
090
1
10
9
-1
Biggin Hill A/P
51.3308N 0.0325W
1730
1720
9.77
10
0.23
1.01
-1
-2.01
4136
4400
264
1026.2
1026
-0.2
74
090
16
10
6
-4
London City A/P
51.5053N 0.0553W
1730
1720
10.82
11
0.18
0.16
-2
-2.16
4255
5200
945
1026.5
1027
0.5
89
110
21
10
9
-1
East Midlands A/P
52.8311N -1.3281E
1730
1720
11.17
13
1.83
-1.95
-2
-0.05
5712
6000
288
1027.0
1026
-1
87
070
17
4
6
2
Doncaster A/P
53.4747N -1.0044E
1730
1720
11.68
13
1.32
-0.86
0
0.86
5242
5200
-42
1027.2
1028
0.8
96
080
16
4
7
3
Liverpool A/P
53.3340N -2.8500E
1730
1720
10.28
16
5.72
3.43
2
-1.43
4007
5600
1593
1026.6
1027
0.4
126
210
84
3
4
1
Wick A/P
58.4589N -3.0931E
1730
1720
8.48
9
0.52
3.98
4
0.02
1891
2000
109
1025.1
1025
-0.1
143
130
13
19
13
-6
7Pembrey Sands Stn
51.7144N -4.3675E
1600
1550
8.69
11
2.31
2.15
1
-1.15
2800
4000
1200
1027.8
1028
0.2
227
250
23
6
9
3
0RNAS Yeovilton
51.0063N -2.6428E
1700
1650
11.41
13
1.59
2.22
-2
-4.22
3990
6000
2010
1026.8
1026
-0.8
93
040
53
2
3
1


Table Averages
Difference Averages: Dry: 1.78° C - Wet: -0.71° C - Wind Speed: -1.16 Knots (RASP High) - Wind Deviation: 33.7 Degrees - Pressure: -0.1 mb - Cloudbase: 669 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
EGSC (B) Cambridge A/P - METAR report more than six hours old (24 hours) for EGSC - report not usable.
EGNC (C) Carlisle A/P - METAR report more than six hours old (9962 hours) for EGNC - report not usable.
EGWC (D) RAF Cosford - METAR report more than six hours old (77 hours) for EGWC - report not usable.
EGEC (L) Cambel Town - METAR report more than six hours old (32 hours) for EGEC - report not usable.
EGNM (2) Leeds A/P - METAR report more than six hours old (25 hours) for EGNM - 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.