frostfern
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Everything posted by frostfern
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Yea. That brief couplet wasn't the meso but birds or maybe a microburst or something. I'm not good at figuring out what brief high velocity spikes mean, but if it persists in the same spot more than one scan and shows up from more than one radar it might be something. There is broad rotation all the way up in this cell, but the updraft base is pretty high to spin anything up. The higher dews feeding it are all around 850 mb.
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If I was to pick a location for the next few hours it would probably be around Keokuk Iowa / Hamilton Illinois, perhaps slightly north of there. There's a band of high helicity and moisture pooling there.
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There's lots of rotation, but it's pretty broad in general. The occasional higher velocity values values seem noisy and inconsistent, like birds or something. These things have a history of bringing damaging winds down to the surface when the RFD surges though.
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The area of cells in Missouri is now expanding northeast towards SE Iowa. These are all under 3500+ j/kg SB cape.
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It's an 850mb based cell. Hard to get a tornado out of that so far north of the warm front, but downbursts can certainly penetrate down into a stable surface layer. Also big hail still possible.
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I remember 2.25” hail in Allegan county after dark on 4-07-20.
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The problem is you can’t totally discount hail north of the front. The lake isn’t going to do anything to suppress elevated convection. It will *probably* weaken for other reasons( stratiform precip diminishing the CAPE from above or more widespread but weaker cells due to competition ). Hard to say though. I can pass on the severe wind and hail, but I really want a good light show.
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Definitely possible with the right setup. The main issue is the warm front position though. I think what mitigates things on this side of the state will be overnight convection slowing down the warm front rather than the lake. I think surface based cells or a line will probably move in from the SW ( not affected by the lake at all ) and affect the SE part of the state regardless. Have to see what happens tonight though with the elevated stuff.
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Strong flow at 925 can mitigate negative effects over the lake. If there's enough surface backing there can be some enhancement. The southeastern side looks most favorable though. I get the feeling there will be broken initiation along the lake breeze, like right along 131, that then fills in and grows as it moves east.
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I'm thinking it might end up more localized. The CAPE / shear combo is impressive, but if the warm sector is really that hot the greatest risk will be relegated to near the warm front. It's still a scary setup as the potential for an EF3 or EF4 happening somewhere is still significant. The southern zone over AR could be active again too.
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So if I chase it's looking like Northern Illinois will be entirely after dark? I can get to Iowa after spending Monday night somewhere well south of Chicago, but it will be a long drive back to Michigan once it's over. Could be difficult driving in heavy rain too. I have obligations Wednesday. I will have to keep watching trends tomorrow morning. If the initiation is going to trend later in the evening and farther west than Eastern Iowa I might just forget it.
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Its not quite as bad as Lake Michigan, but the Mississippi doesn’t have bridges everywhere. I also feel like you need the interstates to keep ahead of cells moving 50mph+. I don’t know if its the same everywhere but its definitely pothole season around here.
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Rainfall over the next 10 days could be concerning with more than one strong system potentially tracking over the same area with multiple rounds of convection and stratiform precip as well. Even with snowpack long gone, pre-leaf-out rains will saturate the soil pretty quick. Flash flooding seems pretty much guaranteed some places.
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Cells will be moving crazy fast though. I'd definitely study the road networks ahead of time in the target area.
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It looks like a more of a cold-core setup that's more dependent on steep lapse rates than high dewpoints. If you can get large CAPE with surface temperatures only on the upper 60s, that's not a big dewpoint depression. I think early spring 70/58 ttd can be more of a tornado threat than 85/64 ttd late spring, given the same CAPE and shear.
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Better to just hijack it with talk of sad palm trees. It's called NIMBYIDCS. Not in my backyard I don't care syndrome.
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There's palm trees in Seattle, but they only really survive next to buildings and look pretty sad in the winter. Falling into the low 20s at night isn't uncommon at all with Fraser Valley outflows, even down to Tacoma. It tends to be even less modified by interaction with the Sound as you go north into Canada.
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Worse. Rainer followed by CAD.
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Anyone else watching the tornado warned supercells in California? Two cells are looking pretty impressive. Low topped but very high DBZ and VIL and occasional low level couplets appearing.
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I saw my "pet" groundhog for the first time this morning, rooting around in the snow for bird feed. I thought maybe it moved away, but it's still here for the third spring. The burrow entrance is in the exact same place, but have no idea how far it goes.
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Everyone focuses on severe weather, but I enjoy non-severe nocturnal storms as they are the best for recording thunder.
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There was 9.5" in the grass right around daybreak this morning, but if you went out and measured now you'd never know it. It's already compacted and melted down to about 5" on the grass and 3" pure slush on sidewalks and driveways. Looking at the puddles I'd say probably 15% melting and 30% compacting. It seems the temperature had a huge impact on totals. When it was hovering around 30 it accumulated pretty efficiently, then it rose above freezing and instantly compacted to your standard 10:1.
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About 9" here at peak fluff. I drops off a bit where I am, a bit NE from where you are. It's probably going to shrink some in the next few hours as it warms above freezing. The flakes are so large that it's not super dense, despite being a wet snow. It has that lake effect dendrite quality, despite being synoptic in nature. You could really see the elevated convergence zone just sitting over the line from just north of Holland to a little south of Lansing.
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8” here and its still coming down pretty good.
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Very heavy tree stickage with wet dendrites and not much wind. Radar has an interesting layered cellular pattern, like a checker-board from waves intersecting at right angles.
