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2024 Short/Medium Range Severe Weather Discussion


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9 hours ago, madwx said:

Just look how it’s resolving the convection in Minnesota.  Should give you some peace of mind

Pretty sure none of the CAMs I usually check on a regular basis (HRRR, 3K NAM, FV3) accurately resolved the MCS currently passing through southern Wisconsin.

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Just now, CheeselandSkies said:

Pretty sure none of the CAMs I usually check on a regular basis (HRRR, 3K NAM, FV3) accurately resolved the MCS currently passing through southern Wisconsin.

Typical for this kind of pattern tho right

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1 hour ago, IWXwx said:

This morning’s 3k NAM is trash. Didn’t initialize correctly, not even picking the storms currently rolling through Chicagoland this morning

SPC's 13Z outlook is a case study in "the struggle is real."

Found my one plant stand blown over again by the round we got this morning; and we got so much rain between the multiple rounds since yesterday evening that any in pots lacking drain holes were being drowned in water.

HRRR thinks we should get in on some more boomers this aft/eve.

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Furthermore, tomorrow seems like the kind of pattern that has historically supported sneaky S WI/N IL summer sig :twister:events...if everything lines up just right.

Quote
 General expectation is for warm front to extend eastward from a
 surface low near the SD/NE/IA border intersection along the MN/IA
 border vicinity into southern WI.

Currently, none of the 33-37 hour CAM solutions really suggest such, but as we know... :unsure:

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2 hours ago, IWXwx said:

This morning’s 3k NAM is trash. Didn’t initialize correctly, not even picking the storms currently rolling through Chicagoland this morning

HRRR is trash too. Not handling this current line well at all.

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The HRRR is insistent on convection erupting and a linear looking MCS congealing very quickly around 7-8PM in the IA/IL/WI tri-state region and then bowing southeast across S WI, N IL into NW IN in the late evening/early overnight hours. The HRDPS supports that as does the 3km NAM. The globals sort of show that for today but have better support for a similar looking setup tomorrow night. We may pull off the rare "MCS wave" getting three consecutive nights of evening or nocturnal boomers here if it all comes together.

ETA:

Upgrade to Enhanced on Day 2 for E IA/N IL/N IN.

image.png.88cbc570083dcbb76c4bda1b8ece84d4.png

 

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LOL at SPC in issuing a Watch for our county at 12:46 PM EDT, 20 minutes after IWX issued a warning for us, which was promptly canceled an hour later. :axe:

I was out spotting and only got a 48 MPH gust, but there were a few trees/limbs down in the area, including a limb into my daughter's brand new fence and shed. The rest of the tree is leaning against the power pole in the background.

There was a nice little feature on radar as the line approached (I failed grab the couplet on velocity) that had me concerned, but nothing came of it.

image000001.JPEG

071424 Storm.png

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The big one, two punch beginning soon.

   Mesoscale Discussion 1615
   NWS Storm Prediction Center Norman OK
   0315 PM CDT Sun Jul 14 2024

   Areas affected...Parts of IA...northern IL...southern WI

   Concerning...Severe potential...Watch likely 

   Valid 142015Z - 142145Z

   Probability of Watch Issuance...80 percent

   SUMMARY...Strong to severe storm development is expected later this
   afternoon into the evening. Eventual watch issuance is likely.

   DISCUSSION...Rather strong heating/destabilization is underway
   across much of IA this afternoon, while recovery in the wake of
   morning convection/outflow is ongoing across northern IL. Meanwhile,
   the remnant MCV from last night's severe MCS over the Dakotas is
   currently moving across northern IA. As MLCINH continues to erode
   across northern/eastern IA and MLCAPE increases above 3000 J/kg, the
   MCV may aid in scattered thunderstorm development later this
   afternoon. Midlevel flow is not particularly strong across the
   region, but sufficient to support effective shear of 25-35 kt and
   potential for some storm organization. 

   Initial discrete development could evolve into a supercell or two,
   with a threat of hail, locally damaging wind, and possibly a
   tornado. In conjunction with the MCV, a persistent 20-30 kt
   southwesterly low-level jet could encourage relatively quick
   clustering and upscale growth, with some potential for an MCS to
   develop and move eastward across northern IL and southern WI this
   evening, with a continued severe-wind threat.  

   Farther northwest, in the wake of the MCV, cumulus is deepening
   along a weak surface boundary across northwest IA. While this area
   is in the immediate wake of the MCV, strong buoyancy and sufficient
   deep-layer shear would support severe-thunderstorm potential in this
   area as well, if storms can mature. 

   While favored timing and area remain somewhat uncertain, watch
   issuance will become increasingly likely if storm initiation appears
   imminent across the region.

   ..Dean/Hart.. 07/14/2024

   ...Please see www.spc.noaa.gov for graphic product...


 

IMG_1212.png

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2 hours ago, sbnwx85 said:

The big one, two punch beginning soon.

   Mesoscale Discussion 1615
   NWS Storm Prediction Center Norman OK
   0315 PM CDT Sun Jul 14 2024

   Areas affected...Parts of IA...northern IL...southern WI

   Concerning...Severe potential...Watch likely 

   Valid 142015Z - 142145Z

   Probability of Watch Issuance...80 percent

   SUMMARY...Strong to severe storm development is expected later this
   afternoon into the evening. Eventual watch issuance is likely.

   DISCUSSION...Rather strong heating/destabilization is underway
   across much of IA this afternoon, while recovery in the wake of
   morning convection/outflow is ongoing across northern IL. Meanwhile,
   the remnant MCV from last night's severe MCS over the Dakotas is
   currently moving across northern IA. As MLCINH continues to erode
   across northern/eastern IA and MLCAPE increases above 3000 J/kg, the
   MCV may aid in scattered thunderstorm development later this
   afternoon. Midlevel flow is not particularly strong across the
   region, but sufficient to support effective shear of 25-35 kt and
   potential for some storm organization. 

   Initial discrete development could evolve into a supercell or two,
   with a threat of hail, locally damaging wind, and possibly a
   tornado. In conjunction with the MCV, a persistent 20-30 kt
   southwesterly low-level jet could encourage relatively quick
   clustering and upscale growth, with some potential for an MCS to
   develop and move eastward across northern IL and southern WI this
   evening, with a continued severe-wind threat.  

   Farther northwest, in the wake of the MCV, cumulus is deepening
   along a weak surface boundary across northwest IA. While this area
   is in the immediate wake of the MCV, strong buoyancy and sufficient
   deep-layer shear would support severe-thunderstorm potential in this
   area as well, if storms can mature. 

   While favored timing and area remain somewhat uncertain, watch
   issuance will become increasingly likely if storm initiation appears
   imminent across the region.

   ..Dean/Hart.. 07/14/2024

   ...Please see www.spc.noaa.gov for graphic product...


 

IMG_1212.png

New severe thunderstorm watch for this area, valid until 1:00 central time

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Really good light show in the small leading WAA wing.

 

ETA: Big boy wind with this line. No wind report at KDKB on the 9:15 observation. The ASOS is damaged per the METAR report.

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tornado warning near Geneva IL

Quote

Kane IL-
932 PM CDT Sun Jul 14 2024

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1000 PM CDT FOR CENTRAL
KANE COUNTY...

At 931 PM CDT, a severe squall line capable of producing both
tornadoes and extensive straight line wind damage was located along a
line extending from near Lily Lake to near Elburn, moving east at 45
mph.

HAZARD...Tornado.

SOURCE...Radar indicated rotation.

 

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10 hours ago, sbnwx85 said:

Hoping the line holds together enough to pack a decent punch this far east. It’ll be a close call. Should still get some thunder and heavy rain.

I slept through most of last night’s storms. I woke up to some rumbles, looked at radar and the line was decaying. I guess I didn’t miss much.

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