Correlations

Lamb Weather Types and UKP correlations

England & Wales

I had previously plotted correlations between LWTLWT Lamb Weather Types are often used in UK-based analyses, with individual weather patterns based on the eight primary cardinal directions (N, NE, E, SE, S, SW, W, NW) plus cyclonic (C), anticyclonic (A) and unclassified (U) types. and CETCET Central England Temperature, so the obvious thing to do now was to plot correlation charts using daily LWT types and daily rainfall from the UKPUKP UKP is a gridded datasets of UK regional precipitation. regional rainfall series, which I download from the UKMOUKMO The Meteorological Office is the United Kingdom's national weather service. It is an executive agency and trading fund of the Department for Business, Energy and Industrial Strategy. It turned out to be even less exciting than a lot of the climate statistics I’ve produced before, in that it just confirmed what you could easily deduce by using a little common sense in that anticyclonic weather types are drier than cyclonic types. 🙂
Generally westerly types come in second wettest, using an average for the whole year.
Depending on what region you look at, easterly & northerly types are sometimes drier than anticyclonic types. The reason for that is that the results are likely skewed for easterly and northerly types because they occur much less frequently than do anticyclonic types.
Westerly types in Scotland (see below) seem to peak in January, at close to 2 mm per day, but fall to a low of 0.4 mm in May, again a fairly obvious correlation.

Northern Scotland
Correlations, LWT, UKP

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Lamb Weather Type and Central England Temperature correlations

I wrote some code a long while ago now that correlated temperatures in the Central England with the corresponding weather type from the objective Lamb Weather Type series. I compared just the six pure types, anticyclonic, cyclonic, northerly, easterly, southerly and westerly. The application allows you to correlate using the mean, maximum or minimum temperatures with the LWTLWT Lamb Weather Types are often used in UK-based analyses, with individual weather patterns based on the eight primary cardinal directions (N, NE, E, SE, S, SW, W, NW) plus cyclonic (C), anticyclonic (A) and unclassified (U) types. on that day. I may have published these charts in a previous blog but I forget, so here they are again 😉

Cyclonic types, whatever the time of years generally seem to be associated with colder anomalies.

Mean temperatures in anticyclonic types are generally only warmer in the months of June or July, otherwise they are invariably colder. See below for charts of maximum and minimum CETs.

As you would expect northerly LWT types always produce colder mean temperatures in central England.

Not surprisingly E types are much colder from October to May, but a little warmer in the extended summer months.

Southerly types are warmer from around April till the end of October, otherwise they produce lower than average mean temperatures.

Westerly types in contrast to N, S, and E types are usually a little colder in the summer, from mid-April to the start of October, in winter they are nearly always milder.

Above are charts for mean maximum and mean minimum temperatures for anticyclonic types, the results of which are a little surprising to me, in that the maximum correlation in summer months is much lower than I imagined it would be, because of course you naturally assume the A type, must be the one favoured for many of the very warm spells in summer. I calculated all the anomalies in the correlations using the 1878-2023 long-term averages, which I thought was the fairest way of doing things, but maybe I was wrong. Perhaps if I revisit this code again I’ll add the frequency each weather type occurs. 😜

CET, Correlations, LWT

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Spring [MAM] 2024 – UK Correlations

According to gridded climate data from the UKMOUKMO The Meteorological Office is the United Kingdom's national weather service. It is an executive agency and trading fund of the Department for Business, Energy and Industrial Strategy, the UKUK The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain, is a country in Europe, off the north-western coast of the continental mainland. It comprises England, Scotland, Wales and Northern Ireland. was warmer and wetter than average, as well as being warmer and duller than average in Spring [MAMMAM Meteorological Spring comprising the months of March, April & May] of 2024.

Climate, Correlations, Spring

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