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Severe Weather Threat 4/27-4/28

now
That's the current Day 3 wording. Newest Day 3 won't come out until 2:30pm
out

THE EVOLUTION OF FEATURES FROM D2 MONDAY INTO D3 TUESDAY, INCLUDING
ANY REMNANT OUTFLOW BOUNDARIES AND ONGOING STORMS ECT REMAIN
UNCERTAIN AND THUSLY LEADS TO SOME UNCERTAINTY IN THE D3 FORECAST.
IT DOES APPEAR THAT THE PARAMETER SPACE ALONG AND SOUTH OF THE COLD
FRONT FROM EASTERN OKLAHOMA/NORTHEASTERN TEXAS NORTHWARD INTO THE
MISSISSIPPI RIVER VALLEY WOULD BE SUPPORTIVE OF SUPERCELLS, GIVEN
STRONG MID-LEVEL FLOW AND SUFFICIENT DEEP LAYER SHEAR. THESE WOULD
LIKELY POSE SOME RISK FOR LARGE TO VERY LARGE HAIL, DAMAGING WIND,
AND PERHAPS TORNADOES. SUPERCELLS WILL ALSO BE POSSIBLE NEAR/NORTH
OF THE BOUNDARY ACROSS NORTHERN MISSOURI INTO WESTERN KENTUCKY, WITH
A RISK FOR ELEVATED STORMS AND LARGE HAIL. IT IS LIKELY GIVE THE
ORIENTATION OF SHEAR PARALLEL TO THE BOUNDARY THAT
CLUSTERING/UPSCALE GROWTH WILL BE FAVORED THROUGH TIME, WITH PERHAPS
SEVERAL CLUSTERS/BOWING SEGMENTS AND SOME INCREASE OF THE DAMAGING
WIND THREAT INTO THE MISSISSIPPI VALLEY/MIDDLE TENNESSEE/OHIO VALLEY
THROUGH THE EVENING. A BROAD 15% AREA WAS MAINTAINED, IN ALIGNMENT
WITH D3 ML CSU/NSSL GUIDANCE GIVEN UNCERTAINTY. A CORRIDOR OF HIGHER
PROBABILITIES MAY BE WARRANTED AS DETAILS BECOME MORE CLEAR.
 
18z HRRR stays confident in the early, widespread convection. Just read PAH's discussion and they aren't buying the HRRR. They do mention EF-2+ tornadoes and even think there will be a strong tornado threat within a broken line late into the night. Very strong wording for an enhanced risk.
 
Sizeable uptrend in the Southern Illinois vicinity on the latest RAP and HRRR. I don't see any situation where this isn't a productive tornado environment.

IMG-4405.png
 
I think the storms/crapvection being depicted all over some of the warm sector through 15-16z may keep them from going moderate, but this will be a potent environment regardless. Latest HRRR actually depicts rotation for some of those early round storms.
Could definitely see it happening - there's been a number of events where early day "slop" still managed to get rooted and develop mesocyclones.
 
Could definitely see it happening - there's been a number of events where early day "slop" still managed to get rooted and develop mesocyclones.
In the words of Cam Nixon, CAMS are junk food, but I find it interesting it’s showing signals for more rotating updrafts in the morning/early day round in the MO/IL/IN vicinity vs the afternoon round. Probably just a HRRR quirk.
 
00z HRRR is genuinely a high end event. Two bands of semi discrete supercells fire in a environment that morning convection is stunted way more north leading to a much more dangerous spatial extent.

Trey even believed HRRR was a outlier when it came to morning convection here too. Dangerous run for intense, long track tornadoes tomorrow, no doubt. If this scenario comes to fruition, coming to morning convection, this is not ideal at all.

That is essentially a Hall of fame HRRR run. Don't get caught up on this yet. It comes down to morning convection. But all I'm saying is that that is a legit scenario we could be dealing with tomorrow. If morning convection stunts that far north, we have a highly dangerous scenario on our hands.
 
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