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Old 07-08-2020, 03:13 PM   #1
CanisLupusArctos
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Default ***severe t-storm watch #343***

Severe Thunderstorm Watch #343 is now in effect until 10 p.m. and includes all of New Hampshire. That means conditions are favorable in and near the watch area. In addition, there are already warnings issued for a couple of storms within the watch area.

"Severe" means wind (straight line or rotating) or hail that are capable of damage, and nothing else.

ALL thunderstorms have lightning, and one strike is enough to be fatal or start a fire. A squall can produce torrential rain without any lightning. Some thunderstorms produce no rain because it evaporates as it leaves the cloud.

Today's main "severe" threats are straight-line wind gusts and hail. In addition to the severe threats, there is also potential for torrential downpours and flash flooding. As with any thunderstorm, lightning is always a potential problem even when it's the only pulse a cloud ever produces.

Here is the link to the watch, issued by the NOAA Storm Prediction Center in Norman OK: https://www.spc.noaa.gov/products/watch/ww0343.html

Warnings (and other localized info products) come from the National Weather Service (NWS) in Gray ME: www.weather.gov/gyx Scroll down to the bottom of the page for radar and satellite images.

Stay safe!
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Old 07-08-2020, 03:32 PM   #2
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Default Rumbles in Alton

Were have some rumbles kind thunder in Alton Bay right now, and nearest lightning strike is 9 miles west of me.

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Old 07-08-2020, 03:52 PM   #3
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Default Heads up southern shores

Local radar shows the heaviest activity in the lakes region going across the southern shore of the lake and the northern Concord area. The towns immediately around Mt. Major are in the bullseye right now. Early heads-up: Route 11 between Alton and Rochester.

This isn't the only line of storms today, but strong storms often use up all the "ingredients" over the towns they hit, which can reduce the severity of a second round. It doesn't always work out that way, and on many storm threat days there's only one round. Today there are several rounds, so we'll have to keep that info in mind.
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Old 07-08-2020, 07:17 PM   #4
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Default

With all these lightening strikes clustered around squam, have to wonder if there is some rotation out there. All those particles bouncing off of each other, it is a dramatic increase in strikes.

https://www.lightningmaps.org/#m=oss...d=2;dl=2;dc=0;
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Old 07-09-2020, 12:56 AM   #5
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Default Good call

Good point! The risk of tornadic activity with this system was very low, but in meteorology it's always tricky to remember 3-D thinking. The storm probably had some horizontal rotation (like a log rolling within). Additionally, its updraft probably had a lot of curls and eddies in it -- similar to a vigorous volcanic eruption column (those produce lightning, but not tornadoes.) That would account for the larger-than-usual cloud-to-ground strikes that storm made ahead of its rain columns as it approached the lake.

Anyone's property get struck?
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