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April 10th - April 13th(?) Severe Weather, Moderate risk in place for Iowa today


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7 minutes ago, KSWx said:

HRRR put on one of the more impressive performances I've seen; highly complex system and nearly nailed it from the hour it was in range.

Absolutely. 

Also very interesting how many of the same general areas in Texas were affected tonight as they were a few weeks ago. At least for central and east/NE Texas. 

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Impressive, mature bowing MCS slamming Shreveport right now. Numerous circulations noted up and down the bow in northwestern Louisiana.

Will be interesting to see how this system affects the risk tomorrow. Point forecast soundings show a bit of wind field disruption around 700-600mb across southern/eastern Arkansas and vicinity, in the wake of the MCS. It could also leave one or more outflow boundaries as well. 

I think tomorrow is a complex day with higher end potential, at least on a localized level. The only limiting factor may be a tendency for cells along the cold front to cluster/grow upscale. Similar to several events in recent weeks, not a ton of confidence with warm sector supercells. We may have a better idea after watching this MCS evolve through early morning…

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41 minutes ago, nwohweather said:

What an ominous SPC outlook this morning. Not often they mention a risk of a violent tornado

It’s also Broyles… but the parameter space is pretty volatile looking. Potent shear, rich low-level moisture, a bit of an EML. It’s not perfect, but it definitely has the potential to produce one or two intense supercells. 

Some CAMs, including recent HRRR runs show widespread semi discrete supercells blowing up this afternoon near, along and ahead of the cold front. Only concern there would be cell mergers and interactions, but it does seem ominous with locally backed winds near a residual outflow boundary across the AR/LA border area. Storm mode could get messy, but I’d focus the most intense tornado potential over northern LA, southern AR into western MS.

We could have a localized outbreak on our hands. 

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Day 1 Convective Outlook  
   NWS Storm Prediction Center Norman OK
   0758 AM CDT Wed Apr 13 2022

   Valid 131300Z - 141200Z

   ...THERE IS A MODERATE RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS
   OF AR/MS/TN/MO/IL/IN/KY...

   ...SUMMARY...
   Numerous severe thunderstorms are expected today across the
   Mid-South and lower/middle Mississippi Valley and Midwest.
   Tornadoes, some of which will be strong, widespread and potentially
   significant damaging thunderstorm winds, and large hail are likely
   especially within the Moderate and Enhanced Risk areas.

   A severe-storm outbreak is expected today into tonight. Widespread
   severe storms are likely across a very broad north-south region from
   the Lower Mississippi Valley and Mid-South into the Midwest, with
   atmospheric ingredients favorable for all severe hazards, including
   potentially significant/intense severe storms.

   ...Mid-South/Lower to Middle Mississippi Valley/Midwest...
   An upper trough, with its axis centered over the High Plains early
   today, will eject northeastward toward the Midwest/Ohio Valley, with
   a pronounced strengthening of mid/high-level jet stream winds
   (80-110 kt) particularly over the Ozarks/Midwest/Ohio Valley. These
   strong winds and related height falls/forcing for ascent will
   overspread a semi-moist boundary layer (low to middle 60s F surface
   dewpoints) across the Midwest ahead of an eastward-moving cold
   front, with more consequential moisture availability (upper 60s F)
   expected across the ArkLaTex/Mid-South/Lower Mississippi Valley,
   where severe/supercell-conducive wind profiles will exist even well
   south of the stronger portions of the polar jet.

   Speaking to early morning airmass characteristics, pre-dawn surface
   analysis in conjunction with 00z and 06z (via PERiLS project)
   upper-air analysis/trends reflect some air mass impacts via a
   persistent MCS and resultant MCV across western Tennessee and nearby
   ArkLaMiss. Observed meso-high and MCS-aftermath dry air in vicinity
   of the ArkLaMiss are expected to decay relatively early today,
   although these factors cast some uncertainty for the spatial details
   of later-day availability of rich moisture. For these reasons, along
   with a considerable amount of upstream early day convection/cloud
   cover, an upward adjustment to the current Moderate Risk category
   does not appear prudent at this time /13z/. That said, regarding the
   early day MCV/lingering outflow, an ample moisture reservoir over
   east Texas (850 mb dewpoints 12+C) is expected to largely replenish
   the broad warm/moist sector into the afternoon (reference 12z
   Shreveport LA observed sounding etc.), which will be beneath a
   notable eastward-extending elevated mixed layer.

   For short-term details across southeast Oklahoma and the ArkLaTex,
   see Mesoscale Discussion 471. Regarding central/southern Missouri
   and western Illinois in the short-term, see Mesoscale Discussion
   472.

   By midday/early afternoon, moderate to strong instability and
   steadily weakening CINH will be in place across Arkansas/Louisiana
   toward the Lower Mississippi Valley, where model forecasts have
   MLCAPE in the 2000 to 3000 J/kg range. Ample deep-layer/low-level
   shear will be favorable for supercells, initially capable of large
   hail and tornadoes. Discrete supercells ahead of the organizing
   squall line will have the potential for strong/intense tornadoes
   including some that are potentially long-track, particularly as the
   low-level jet further strengthens across the region later this
   afternoon into early evening. This corridor of
   stronger/longer-duration tornado concern is focused across the
   Mid-South/ArkLaMiss vicinity. Otherwise, potentially
   widespread/locally significant damaging thunderstorm wind gusts will
   also evolve as the squall line organizes, intensifies, and moves
   eastward with embedded bowing segments, although QLCS-related
   tornadoes can also be expected.

   The damaging wind/tornado risk may linger through the
   late-evening/overnight hours across portions of Mississippi/Alabama
   and southern Louisiana and the Florida Panhandle. This would be via
   a persistence of moist and strong/confluent low-level flow, although
   850 mb winds are forecast to gradually weaken overnight.

   For areas northward into/across Missouri, Illinois, and Indiana, it
   appears likely that storms will increase and intensify initially
   across southern Missouri, as early as this morning in vicinity of
   the outflow-enhanced effective cold front. These storms will pose a
   damaging wind and some severe hail risk especially into the
   afternoon as they organize and race east-northeastward. The
   potential for tornadoes will exist as well, in dual scenarios
   including any pre-squall line supercellular development and within
   an evolving QLCS itself, especially as storms encounter a
   dramatically strengthening south-southwesterly low-level jet (50-60
   kt at 850 mb) across southeast Missouri and areas eastward across
   Illinois/Indiana/Kentucky. Tornadoes and potentially
   widespread/locally significant damaging winds are likely especially
   through the afternoon and early/mid-evening hours.

 

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1 hour ago, Quincy said:

It’s also Broyles… but the parameter space is pretty volatile looking. Potent shear, rich low-level moisture, a bit of an EML. It’s not perfect, but it definitely has the potential to produce one or two intense supercells. 

Some CAMs, including recent HRRR runs show widespread semi discrete supercells blowing up this afternoon near, along and ahead of the cold front. Only concern there would be cell mergers and interactions, but it does seem ominous with locally backed winds near a residual outflow boundary across the AR/LA border area. Storm mode could get messy, but I’d focus the most intense tornado potential over northern LA, southern AR into western MS.

We could have a localized outbreak on our hands. 

The SPC is considering a tornado watch for the Ark-la-tex region this morning. The HRRR is showing a line of storms/possible supercells in ETX by the 18-20z timeframe. 

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12Z HRRR has quite the volatile environment over Mississippi this afternoon, though it has a bit of a tendency to overdo the extent of isolated convection. As is often the case in these setups, keep an eye out for areas a bit south of the highest risk areas, as they often produce discrete supercells even with somewhat less impressive dynamics, while areas within the main risk areas tend to grow upscale a bit quicker. Just for the heck of it, here's a cherry-picked sounding from AR this afternoon, SRH values are rather impressive. 

hrrr_2022041312_008_34.3--92.1.png

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Analyzing the lower Mississippi Valley portion of the threat area…

Outflow boundary from overnight MCS draped from eastern Arkansas into central Mississippi. Richest low-level moisture is confined to Louisiana, but rapid air mass recovery is underway, thanks to a 50-60 knot low-level jet. 

EA67D2B1-0AA8-496C-B39A-2464F9EC3D23.jpeg.dd39c6d7ddf55844aa23bc7d913bbe16.jpeg
Still noting some wind field disruption between the two boundaries, where there is some veer-back-veer signals (particularly over southeastern Arkansas. This could result in mixed storm modes with widespread thunderstorm activity developing this afternoon over eastern Arkansas. Even with some wind field issues, most data shows enlarging 0-3km hodographs and supercell wind profiles.

Boundary interaction in this type of setup can be very complex. Do a few storms thread the needle and become intense, long track supercells? Or is it just a blobby mess. I think this is the difference between moderate and high risk  

I believe the most shot for somewhat more isolated supercell activity will be from Far East Texas into Louisiana and possibly southern Arkansas/western Mississippi.

It’s going to be a busy day. 

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40/20 on the second tor watch for IL/MO

SEL1

   URGENT - IMMEDIATE BROADCAST REQUESTED
   Tornado Watch Number 121
   NWS Storm Prediction Center Norman OK
   1115 AM CDT Wed Apr 13 2022

   The NWS Storm Prediction Center has issued a

   * Tornado Watch for portions of 
     Southern Illinois
     Southeastern Missouri

   * Effective this Wednesday morning and afternoon from 1115 AM
     until 400 PM CDT.

   * Primary threats include...
     A couple tornadoes possible
     Scattered damaging winds and isolated significant gusts to 75
       mph likely
     Isolated large hail events to 1 inch in diameter possible

   SUMMARY...A line of storms is expected to continue moving
   east-northeastward into southeastern Missouri and southern Illinois
   through early-mid afternoon.  The primary severe threat will be
   damaging winds with bowing segments in the line, though embedded
   circulations will also pose the threat for a couple of tornadoes.

   The tornado watch area is approximately along and 70 statute miles
   east and west of a line from 45 miles northwest of Carbondale IL to
   30 miles southwest of Poplar Bluff MO. For a complete depiction of
   the watch see the associated watch outline update (WOUS64 KWNS
   WOU1).

   PRECAUTIONARY/PREPAREDNESS ACTIONS...

   REMEMBER...A Tornado Watch means conditions are favorable for
   tornadoes and severe thunderstorms in and close to the watch
   area. Persons in these areas should be on the lookout for
   threatening weather conditions and listen for later statements
   and possible warnings.

   &&

   OTHER WATCH INFORMATION...CONTINUE...WW 120...

   AVIATION...Tornadoes and a few severe thunderstorms with hail
   surface and aloft to 1 inch. Extreme turbulence and surface wind
   gusts to 65 knots. A few cumulonimbi with maximum tops to 500. Mean
   storm motion vector 25040.

   ...Thompson
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Back in Texas, there is clearing ahead of the actual front, SPC RAP based meso seems to confirm that line is the front.  MLCAPE ~2000 J/Kg, bulk shear 30 knots or higher N of I-10 (not a perfect description, more of a WSW-ENE orientation, CLL >30 knots, HOU not.)

SPC analysis showing just a small area between the front and the clouds where CINH is below -25 k/Kg, is isn't even 10:30 solar time, HRRR is developing some storms later this afternoon, none look severe.  Arkansas and Mississippi, different, but not my subforum.

 

But the its seems severe happens here more often when the risk is low or none per SPC.  HRRR, judging by updraft helcity, sees nothing in Texas.  Marginal risk still on updated SWODY1 may mean the cap holds, even where there is clearing.  But marginal may be low enough...

Apr13VisSat1130.PNG

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2 minutes ago, Ed, snow and hurricane fan said:

Back in Texas, there is clearing ahead of the actual front, SPC RAP based meso seems to confirm that line is the front.  MLCAPE ~2000 J/Kg, bulk shear 30 knots or higher N of I-10 (not a perfect description, more of a WSW-ENE orientation, CLL >30 knots, HOU not.)

SPC analysis showing just a small area between the front and the clouds where CINH is below -25 k/Kg, is isn't even 10:30 solar time, HRRR is developing some storms later this afternoon, none look severe.  Arkansas and Mississippi, different, but not my subforum.

 

But the its seems severe happens here more often when the risk is low or none per SPC.  HRRR, judging by updraft helcity, sees nothing in Texas.  Marginal risk still on updated SWODY1 may mean the cap holds, even where there is clearing.  But marginal may be low enough...

Apr13VisSat1130.PNG

Just a smidge too late for Dallas judging by radar.  Waco has a chance.

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1 hour ago, Ed, snow and hurricane fan said:

Just a smidge too late for Dallas judging by radar.  Waco has a chance.

Backbuilding to the SW.  Missed the Metroplex and Waco, Navarro County could go severe warned anytime Kaufman, Van Zandt, (named for the Lynryd Sknyrd singer) warned.  Not backbuilt enough to get CLL yet, but has a chance.

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Showers forming NW side (just outside Beltway 8) in Houston area, they are struggling but may have a lightning bolt or two.  Lone cell just missing CLL looks decent, not warned, but maybe by the time its gets to I-45 near Madisonville.  Looks like a trough, winds shifted SW and clearing driving local HOU area showers and lone CLL storm cell, but a narrow sector of high dewpoints even w/ windshift, with the front catching it.  CLL is in the narrow sector between the trough/wind shift to SW and actual front.

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6 minutes ago, cheese007 said:

Pretty quiet in here for 3 active tornado warnings

TN and MO are in the TN Valley subforum.  An undescribed division in Mississippi splits that state between SE US and Tennessee Valley.  The Moderate Risk area is, for now, underperforming, which I assume most people who live in it prefer.

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16 hours ago, Chinook said:

radar image from Salado TX today. I haven't done this GRLevel2 stuff for a while-- downloaded a new 21-day free trial, and maybe I'll maximize my 3D slice and high res possibilities

PxN2Cay.jpg

 

869 
NOUS44 KFWD 132054
PNSFWD
TXZ091>095-100>107-115>123-129>135-141>148-156>162-174-175-132200-

PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE FORT WORTH TX
354 PM CDT WED APR 13 2022

...SALADO TORNADO INFORMATION...

SURVEY TEAMS HAVE CONFIRMED A HIGH-END EF-3 WITH MAXIMUM WINDS
AROUND 165 MPH TRACKED ACROSS SOUTHERN BELL COUNTY AND INTO THE
SALADO AREA TUESDAY EVENING (APRIL 12TH). THE TORNADO BEGAN IN
WILLIAMSON COUNTY, BUT THE TRACK IN BELL COUNTY IS ESTIMATED TO BE
NEARLY 13 MILES LONG WITH A DURATION OF ABOUT 30 MINUTES.

STORM SURVEY TEAMS ARE CURRENTLY ENROUTE BACK TO THE OFFICE AND 
MORE INFORMATION WILL BE RELEASED THIS EVENING WHEN THE TEAMS HAVE
RETURNED.

SEE THE PREVIOUS PUBLIC INFORMATION STATEMENT RELEASED EARLIER
THIS AFTERNOON FOR INFORMATION ABOUT THE OTHER 2 TORNADOES FROM
THE APRIL 12TH EVENT.

$$

JLDUNN
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