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Convective/Thunderstorm Discussion : Spring/Summer 2017
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I think that the dust can "seed" the cloud to an extent, and I notice that when we get "Sahara" rain like we did yesterday, the water droplets tend to be much larger and heavier than what we typically get with conventional frontal rain. Perhaps the heavier water droplets would create greater amounts of static than the dust would by itself. Sure, sandstorms don't create sferics, do they??
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PukkaStukka wrote: »I think that the dust can "seed" the cloud to an extent, and I notice that when we get "Sahara" rain like we did yesterday, the water droplets tend to be much larger and heavier than what we typically get with conventional frontal rain. Perhaps the heavier water droplets would create greater amounts of static than the dust would by itself. Sure, sandstorms don't create sferics, do they??
The droplets would be bigger because they're falling from real high level cloud and really high up in the cloud. They would have originally started out as hailstones but melted completely maybe 200ft? or less maybe before they hit the ground. The bigger the original hailstone falling the bigger the droplet hitting the ground.
A big droplet would break up into smaller droplets if it wasn't frozen for the most of its journey before it hit the ground. That said dust would have been at the core of the hailstone. It's only really hard hailstones that can create lightning or build up a charge in a cloud. I think?
Water droplets won't do it.
That's my take on it anyway.
On the lightning. You can have lightning produced from volcanic eruptions from dust and smoke particules rubbing off one another fast enough and the same for the smoke off some intense wildfires especially in a tornado created by the heat from the fire itself.0 -
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A Yellow warning for rainfall in Northern Ireland tomorrow from the Met Office, hail and thunder forecast there as well.
https://twitter.com/metoffice/status/879274746118107136
[IDay 2 Convective Outlook
VALID 06:00 UTC Tue 27 Jun 2017 - 05:59 UTC Wed 28 Jun 2017
ISSUED 16:43 UTC Sun 25 Jun 2017
ISSUED BY: Dan
Atlantic upper trough will dig south towards Iberia on Tuesday, strong northwesterly jet on its western flank but rather weak return southerly flow on its forward side. Broad upper flow is anticyclonic across the British Isles for much of the day, but higher WBPT airmass will begin to advect northwards from France as the flow backs. Falling heights Tuesday afternoon and evening will promote some destabilisation of this airmass, but in a rather messy fashion with pulses of showery precipitation drifting north from France into southern Britain. This may contain some isolated, embedded lightning, but the bulk of any noteworthy instability will likely only clip the far E/SE corner and largely remain over the nearby Continent. Hence, some lightning may be possible on the eastern flank of showery outbreaks of rain across Kent/Sussex and coastal East Anglia late Tuesday afternoon into the evening/night, but confidence is not particularly high.
Elsewhere, behind the main frontal rain some insolation combined with cool air aloft will generate marginal instability across Northern Ireland, with scope for a few heavy showers here - perhaps weakly electrified.0 -
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