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: 11:11:58 19/09/2021 for this map view. This run created in 56.13 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
1100
1050
18.84
20
1.16
12.48
15
2.52
2767
2000
-767
1014.1
1014
-0.1
119
140
21
7
7
0
RAF Culdrose
50.0843N -5.2571E
1100
1050
16.14
16
-0.14
10.01
12
1.99
2628
1600
-1028
1017.0
1017
0
313
300
13
14
12
-2
FExeter A/P
50.7372N -3.4058E
1100
1050
17.32
17
-0.32
11.49
14
2.51
2459
1200
-1259
1015.3
1015
-0.3
301
280
21
13
5
-8
RAF Odiham
51.2391N -0.9450E
1100
1050
13.76
15
1.24
11.88
14
2.12
1049
400
-649
1014.3
1014
-0.3
299
340
41
9
4
-5
IRAF Wittering
52.6114N -0.4612E
1100
1050
18.18
17
-1.18
12.91
14
1.09
2362
1200
-1162
1013.8
1014
0.2
263
300
37
3
5
2
RAF Fairford
51.68135N -1.79109E
1100
1056
14.95
16
1.05
11.13
14
2.87
1919
800
-1119
1014.6
1015
0.4
317
310
7
5
4
-1
JRAF Shawbury
52.7947N -2.6647E
1100
1050
16.06
17
0.94
9.71
11
1.29
2845
2400
-445
1014.2
1014
-0.2
277
250
27
7
4
-3
KRAF Benson
51.6203N -1.0987E
1100
1050
13.84
15
1.16
13.28
13
-0.28
513
800
287
1014.4
1014
-0.4
278
340
62
7
4
-3
LCambel Town
55.4372N -5.6864E
900
0850
11.93
13
1.07
10.62
12
1.38
678
400
-278
1011.9
1011
-0.9
235
220
15
4
4
0
MRAF Valley
53.2527N -4.5365E
1100
1050
12.66
15
2.34
10.95
13
2.05
721
800
79
1014.9
1014
-0.9
292
310
18
9
10
1
NLydd A/P
50.9561N 0.9392W
1100
1050
18.03
20
1.97
11.96
17
5.04
2463
1200
-1263
1013.5
1014
0.5
152
120
32
4
6
2
ODundee A/P
56.4525N -3.0258E
1100
1050
13.58
17
3.42
11.14
15
3.86
1555
800
-755
1011.9
1012
0.1
231
240
9
12
6
-6
PRAF Kinloss
57.6456N -3.5635E
1100
1050
13.73
15
1.27
12.01
14
1.99
797
400
-397
1010.7
1010
-0.7
239
230
9
5
5
0
QNorwich A/P
52.6333N 1.3000W
1100
1050
17.93
20
2.07
11.27
16
4.73
2698
1600
-1098
1014.5
1014
-0.5
124
130
6
11
8
-3
SLuton A/P
51.8747N -0.3683E
1100
1050
18.81
16
-2.81
12.41
14
1.59
3035
800
-2235
1013.7
1014
0.3
296
320
24
5
7
2
TCardiff Intl A/P
51.3967N -3.3433E
1100
1050
16.23
16
-0.23
12.82
15
2.18
1434
400
-1034
1015.0
1015
0
269
270
1
13
10
-3
UNewcastle A/P
55.0375N -1.6917E
1100
1050
14.05
16
1.95
12.36
12
-0.36
966
1600
634
1013.7
1013
-0.7
245
VRB
0
7
2
-5
VBelfast / Aldergrove A/P
54.6633N -6.2258E
1100
1050
10.26
14
3.74
10.03
12
1.97
242
800
558
1014.0
1013
-1
241
260
19
8
10
2
WManchester A/P
53.3537N -2.2750E
1100
1050
14.85
16
1.15
12.04
12
-0.04
1400
1600
200
1014.3
1014
-0.3
357
230
127
3
4
1
XGlasgow A/P
55.8719N -4.4331E
1100
1050
12.49
14
1.51
10.81
12
1.19
758
800
42
1013.0
1012
-1
223
220
3
9
5
-4
YEdinburgh A/P
55.9500N -3.3500E
1100
1050
15.64
16
0.36
10.97
13
2.03
2077
1200
-877
1012.3
1012
-0.3
238
230
8
7
10
3
ZHeathrow A/P
51.4775N -0.4614E
1100
1050
19.04
17
-2.04
13.66
14
0.34
2352
1200
-1152
1013.6
1014
0.4
327
310
17
6
6
0
1Southampton A/P
50.9499N -1.3585E
1000
0950
13.20
16
2.8
10.76
11
0.24
1053
2000
947
1014.4
1014
-0.4
321
VRB
0
8
3
-5
2Leeds A/P
53.8618N -1.6653E
1100
1050
12.89
13
0.11
10.87
12
1.13
1374
400
-974
1014.2
1014
-0.2
295
260
35
5
4
-1
3Dublin A/P
53.4215N -6.2977E
1200
1100
15.04
15
-0.04
9.61
10
0.39
2451
2000
-451
1015.1
1015
-0.1
275
270
5
12
10
-2
Stornaway A/P
58.2156N -6.3311E
1100
1050
12.26
14
1.74
10.62
12
1.38
762
800
38
1009.7
1009
-0.7
184
180
4
13
11
-2
4Tiree
56.5000N -6.8828E
1100
1050
13.45
15
1.55
11.34
13
1.66
843
800
-43
1011.6
1011
-0.6
210
240
30
15
8
-7
5Benbecula
57.4811N -7.3628E
1100
1050
12.56
15
2.44
11.37
12
0.63
593
1200
607
1010.3
1009
-1.3
213
230
17
13
10
-3
6Ronaldsway A/P
54.0853N -4.6320E
1100
1050
11.20
15
3.8
11.00
12
1
152
1200
1048
1014.0
1013
-1
256
280
24
8
9
1
RAF Boulmer
55.4209N -1.6012E
1100
1050
12.23
16
3.77
10.76
13
2.24
77
1200
1123
1013.3
1013
-0.3
238
170
68
3
4
1
Aberdeen A/P
57.2049N -2.2053E
1100
1050
12.95
16
3.05
12.05
14
1.95
641
800
159
1011.3
1011
-0.3
185
210
25
7
5
-2
Birmingham A/P
52.4602N -1.7576E
1100
1050
16.29
16
-0.29
9.55
12
2.45
3157
1600
-1557
1014.3
1015
0.7
281
VRB
0
4
2
-2
Humberside A/P
53.5744N -0.3508E
1100
1050
18.69
20
1.31
12.73
15
2.27
2574
2000
-574
1013.7
1014
0.3
206
VRB
0
6
1
-5
Staverton A/P
51.8923N -2.1608E
1100
1050
16.46
17
0.54
10.21
12
1.79
2659
2000
-659
1014.9
1015
0.1
281
000
79
5
0
-5
Islay A/P
55.6814N -6.2498E
1100
1050
12.74
15
2.26
10.82
13
2.18
875
800
-75
1012.9
1012
-0.9
224
230
6
12
11
-1
Eglinton A/P
55.0428N -7.1611E
1100
1050
13.30
15
1.7
10.19
12
1.81
1404
1200
-204
1013.3
1013
-0.3
224
240
16
13
12
-1
Southend A/P
51.5714N 0.6956W
1100
1050
19.05
19
-0.05
11.57
15
3.43
3097
1600
-1497
1013.5
1014
0.5
123
VRB
0
3
2
-1
Biggin Hill A/P
51.3308N 0.0325W
1100
1050
18.57
18
-0.57
12.71
14
1.29
2918
1600
-1318
1013.5
1014
0.5
306
VRB
0
3
2
-1
London City A/P
51.5053N 0.0553W
1100
1050
19.54
20
0.46
11.61
15
3.39
3254
2000
-1254
1013.5
1014
0.5
291
VRB
0
2
3
1
East Midlands A/P
52.8311N -1.3281E
1100
1050
13.08
14
0.92
11.32
12
0.68
934
800
-134
1014.4
1014
-0.4
268
280
12
3
6
3
Doncaster A/P
53.4747N -1.0044E
1100
1050
16.69
17
0.31
13.26
13
-0.26
1438
1600
162
1013.9
1015
1.1
242
VRB
0
5
2
-3
Liverpool A/P
53.3340N -2.8500E
1100
1050
12.47
17
4.53
9.79
13
3.21
1652
1600
-52
1014.3
1014
-0.3
301
VRB
0
4
3
-1
Wick A/P
58.4589N -3.0931E
1100
1050
12.56
14
1.44
11.97
14
2.03
283
0
-283
1009.8
1009
-0.8
173
VRB
0
12
3
-9
7Pembrey Sands Stn
51.7144N -4.3675E
1100
1050
15.65
16
0.35
11.64
13
1.36
1733
1200
-533
1015.4
1015
-0.4
316
320
4
6
10
4
0RNAS Yeovilton
51.0063N -2.6428E
1100
1050
17.38
17
-0.38
11.44
12
0.56
2471
2000
-471
1015.1
1015
-0.1
318
260
58
7
5
-2


Table Averages
Difference Averages: Dry: 1.14° C - Wet: 1.75° C - Wind Speed: -1.62 Knots (RASP High) - Wind Deviation: 41.8 Degrees - Pressure: -0.2 mb - Cloudbase: -438 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 (43 hours) for EGSC - report not usable.
EGNC (C) Carlisle A/P - METAR report more than six hours old (13675 hours) for EGNC - report not usable.
EGWC (D) RAF Cosford - METAR report more than six hours old (117 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.