Frost risk tonight

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Julian Mayes

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May 11, 2020, 4:48:12 PM5/11/20
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Following Trevor's report of his record May frost in eastern Scotland last night, with the recent slackening of the nagging (as they say) NE wind, attention turns to the possible plight of my dahlias. 

The MeteoGroup MOS (model output statistics) min temp forecast for Wisley, Surrey is - 0 C (i.e. just below 0.0C). Wisley is cold when the ground is dry. Heathrow is +3 and many rural areas in S England are showing as +1C, implying a widespread ground frost. It was too windy earlier on for me to cover the small plants (I keep them in the ground each winter and they have only come up in the last few weeks). I can't remember a late frost here in recent years but I'm sure many here will know how sensitive they are (dahlias, not the group members) to the first decent frost of autumn. I'm assuming that the warmth of the patio will help the sweet peas through - waiting to be planted out.  

Julian  

 

Brian Wakem

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May 12, 2020, 5:14:24 AM5/12/20
to Weather and Climate
Low of -0.5C at my station.  Not my coldest May night (-1.8) but it is the latest frost in my records (back to 2013) by 2 days.


-- 
Brian Wakem
Lower Bourne, Farnham, Surrey
Live obs @ 10:14:01 : 10.7C, DP 1.2C, RH 52%, 0.0 mm

Julian Mayes

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May 12, 2020, 6:24:37 AM5/12/20
to Weather and Climate
Your figure, Brian, seems typical for SE England last night. Of the sites I mentioned last night, Wisley went down to -1.4C and Heathrow to +2.3C, so just a touch colder than forecast. Teddington reached -0.6C. Benson did what you might expect and reached -4.1C. 

The dahlias survived - just after posting that message I saw a useful hint on the twitter feed of Peter Gibbs - https://twitter.com/PeterGWeather - posted yesterday, he placed plant pots over each young plant. So obvious, why did I not think of doing that?  So now it's back to watering....

Julian  


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