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April 1st-4th Severe Weather Thread


andyhb

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Yea it was from video footage. Took a still so quality is bad. Also had to play with contrast. Lightning wasnt helping us. It was a tornado. Sick of people doubting us. We had many respectable chasers with us and all of them agreed. The terrain didnt help either. So believe what you want man. It is your opinion and you are entitled

 

He wasn't saying you were wrong, chill out.

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More in response to lack of action West of I-35 and commentary on drought/DP relationship, an additional negative factor for DPs.  4 days old or not, I doubt >1ºC temp anomalies disappeared just like that, and SSTs are closer to or even above normal father East in the Gulf, so better dew points further East on the coast isn't unsurprising.  And I chose the NHC anomaly map over the daily updated AOML sat derived SST maps because I was discussing the anomaly.  And nowhere did I mention any opinions on what happens tomorrow.

 

I wouldn't be surprised if the combination of the below-avg Gulf SST's and the drought will make quality moisture hard to come by west of I-35 for a little while longer.

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Moderate risk with near the max probabilities for one.

 

15% sig hatched tornado/45% sig hatched hail/45% wind.

 

DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1258 AM CDT THU APR 03 2014

VALID 031200Z - 041200Z

...THERE IS A MDT RISK OF SVR TSTMS FOR AR...CNTRL/S MO...S IL...W
KY/TN...NW MS...FAR N LA...

...THERE IS A SLGT RISK OF SVR TSTMS FROM THE MIDWEST TO THE WRN
GULF COAST...

...SWATHS OF SCATTERED TO WIDESPREAD SEVERE STORMS APPEAR POSSIBLE
THIS AFTERNOON THROUGH TONIGHT...

...SYNOPSIS...
VIGOROUS SHORTWAVE TROUGH OVER THE DESERT SW WILL EJECT NEWD TOWARDS
THE UPPER MIDWEST THROUGH EARLY FRI. A SUBTLE LEAD IMPULSE EVIDENT
OVER THE SRN HIGH PLAINS IN WATER VAPOR IMAGERY WILL PRECEDE THIS
TROUGH AND SHOULD RACE NEWD TOWARDS THE OH VALLEY. AS THE FORMER
TROUGH TAKES ON A NEUTRAL TO SLIGHTLY NEGATIVE TILT DURING THE LAST
HALF OF THE PERIOD...CYCLOGENESIS WILL ENSUE ALONG A
QUASI-STATIONARY FRONT FROM NEAR KANSAS CITY TO THE QUAD CITIES.
ATTENDANT W/E-ORIENTED WARM FRONT SHOULD PUSH NWD ACROSS THE
MIDWEST...BUT ITS ADVANCEMENT WILL LIKELY BE SLOWED BY ABUNDANT
CONVECTION EARLY IN THE PERIOD. FARTHER W...A DRYLINE WILL MIX EWD
ACROSS ERN OK INTO S-CNTRL TX....BEING PROGRESSIVELY OVERTAKEN FROM
THE N BY A COLD FRONT. THIS COLD FRONT WILL ACCELERATE E/S THU NIGHT
AND SHOULD REACH THE MID-MS VALLEY TO WRN GULF COAST BY 12Z/FRI.

...MIDWEST TO WRN GULF COAST...
A MESSY/COMPLEX SCENARIO IS ANTICIPATED WITH MORNING CONVECTION
APPEARING POSSIBLE ACROSS PARTS OF A BROAD WARM/MOIST
SECTOR...ASSOCIATED WITH A LEAD SHORTWAVE IMPULSE AND LOW-LEVEL WAA.
TWO DISTINCT 700 MB JETS ATTENDANT TO THE LEAD IMPULSE AND THE MORE
VIGOROUS UPSTREAM TROUGH SHOULD EVOLVE DURING THE MORNING/AFTERNOON.

IN ADDITION...AN MCS IS EXPECTED TO BE ONGOING AT 12Z/THU ACROSS
PARTS OF THE LOWER MO/MID-MS VALLEY. THESE FEATURES RENDER LOW
CONFIDENCE IN HOW THE CONVECTIVE SCENARIO SHOULD PLAY OUT AT PEAK
HEATING INTO TONIGHT...ESPECIALLY WITH ERN/NRN EXTENT ACROSS THE
MS/OH VALLEYS. RELATIVELY LARGE DISAGREEMENT IS ALSO EVIDENT IN 00Z
CONVECTION-ALLOWING MODEL GUIDANCE. NEVERTHELESS...A LARGE
WARM/MOIST SECTOR...EXTENSIVE PLUME OF STEEP MID-LEVEL LAPSE
RATES...AND STRONG LOW/DEEP-LAYER SHEAR SUGGEST ANY MAJOR CHANGES TO
INHERITED MODERATE RISK ARE PREMATURE ATTM.

GREATEST CONFIDENCE IN THE DEVELOPMENT OF SURFACE-BASED STORMS IN
THE LATE AFTERNOON EXISTS INVOF THE DRYLINE/COLD FRONT INTERSECTION
ACROSS THE OZARK PLATEAU. HERE...PRONOUNCED SURFACE HEATING NEAR
THIS INTERSECTION SHOULD BE COINCIDENT WITH STRENGTHENING MID-LEVEL
HEIGHT FALLS. AMIDST LOWER TO MIDDLE 60S SURFACE DEW POINTS...STEEP
LAPSE RATES AND STRONG EFFECTIVE SHEAR SHOULD FAVOR SUPERCELLS
CAPABLE OF PRODUCING VERY LARGE HAIL AND A FEW SIGNIFICANT
TORNADOES.
AS CONVERGENCE/WIND FIELDS NEAR THE MERGING FRONT/DRYLINE
STRENGTHEN DURING THE EVENING...UPSCALE GROWTH INTO ONE OR MORE
MCS/S APPEARS LIKELY WITH RISK TRANSITIONING TO PREDOMINANTLY
DAMAGING WINDS. OVERALL INTENSITY WITH ERN EXTENT SHOULD BE
MODULATED BY THE DEGREE OF DESTABILIZATION IN THE WAKE OF
EARLY-PERIOD CONVECTION NEAR THE WARM FRONT.

FARTHER S INTO ERN TX...MORE ISOLATED TSTMS ARE ANTICIPATED ALONG
THE DRYLINE WITH VEER-BACK-VEER WIND PROFILES A POTENTIAL LIMITING
FACTOR TO SUSTAINABILITY OF SUPERCELLS. FARTHER E TOWARDS THE LOWER
MS VALLEY...PRE-FRONTAL CONFLUENCE WITHIN A PLUME OF MIDDLE TO UPPER
60S SURFACE DEW POINTS AND GLANCING INFLUENCE OF MID-LEVEL HEIGHT
FALLS SHOULD AID IN A CLUSTER OF TSTMS FORMING THIS EVENING. ALL
SEVERE HAZARDS APPEAR POSSIBLE WITH POTENTIAL FOR SIGNIFICANT
TORNADOES IN INITIAL SUPERCELLS AS WELL.
UPSCALE GROWTH INTO AN
EXTENSIVE MCS MAY YIELD A PREDOMINANT AND POTENTIALLY WIDESPREAD
DAMAGING WIND RISK OVERNIGHT.

..GRAMS/KERR.. 04/03/2014
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Another subtlety of the NSSL-WRF run is that is has discrete convection popping right ahead of the squall line overnight tomorrow night across northern AL (right on top of Huntsville/Madison, in fact, but that doesn't mean much).  The point is that it's possible we may see a nasty sup or two ahead of the line overnight, and I'm guessing they'd probably be tornadic.

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Sorry. Just had a bunch of FB drama bout it. Was irritated. But you are right it isnt a competition. I chase for the love of weather and had a great day. But onto tmrw. Looks very potent. My gut says play wf but warm sector sups are tempting. Im just afraid low level winds might veer too much. Esp as cf overtakes dryline. Multiple targets. Not sure what to do yet. Lots of nowcasting.

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So I'm on the line tomorrow. Initiation could take place anywhere from just west of here to just east of here. Naturally I'm hoping for the just east of here option.

 

For those that are chasing.......It's still fairly early in the season and we had a cold winter, so the trees are just starting to bud and blossom and many still remain bare so you won't necessarily be chasing in the jungle yet in MO. 

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Ended up staying with that one main supercell that moved from far N. Oklahoma, into Kansas...and eventually south of ICT. It was elevated most of the time, but did provide some photogentic structure, and also nickel size hail.

Early target for tomorrow is somewhere in C. Missouri.

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I lurk here quite often to get a feel for what days to chase since most of y'all are far more adept at forecasting than I'll ever be. I just wanted to give a report of my chase tonight.

I had to wait for my chase partner to finish an exam so we had a late start, but arrived towards the Kansas border from Norman via 35 around 6:30. We decided to head towards the two cells that originated around Hundtley sp? Kansas, but decided to head west towards the late blooming cell that was nearing 35 from the southwest in south central Kansas when it became apparent the other two were weakening. Before reaching 35 from the west we stopped and witnessed a funnel that quickly dissipated as the cell was reaching 35. Long story short we tracked this storm as it moved ene for an hour or so as it produced successive wall clouds and regenerated multiple times. Once it was about 20-30 miles east of 35, it sped up drastically to the point we couldn't get in front of it, so we watched it speed off to the ne. Without a doubt, the view of this cell about 3 miles to its se was the most amazing weather scene I've witnessed to date. Using the lightning to frame it's massive height all the way down to its wall cloud only a couple hundred feet from the ground can only be described as surreal. Even though it was nighttime, it maintained a beautiful structure for hours and while I rarely get the opportunity to chase it was probably my most fun storm to date. I apologize cluttering this thread with a somewhat useless story on a night most would deem a "bust", but I just wanted to share with you guys. Good luck to everyone who gets to go out tomorrow!

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Anyone noticing the strong dry air intrusion (on 2m DP map) showing up on the HRRR/RAP the last few hours? What's causing that? It's not showing up on the 06z NAM. It's strongly punching in from southern OK into NE OK at around 19z tomorrow. 

 

 

EDIT: SGF noticed it as well:

 

 

 

There are a few tidbits worth mentioning regarding
the tornado threat. First off, the last several runs of the RAP and
to some point the NAM indicate some sort of dry line bulge coming
out of northeast Oklahoma. If this were to happen, we may see a
localized increase in low level shear which would enhance tornado
potential.
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I'm torn about venturing out into east Texas for a chase today. Most parameters actually don't look too bad, but wind profiles are pretty mediocre and trees quickly become a problem the further east you go. I'll have a few hours to mull it over before I decide to pull the trigger or not.

Sent from my iPhone using Tapatalk

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Nothing major changed:

 

.NEAR-TERM CONCERNS  
 
INITIAL MCS OVER SRN IL AND ERN MO MAY POSE SHORT-TERM RISK OF  
DAMAGING GUSTS...AND ANOTHER BRIEF/SMALL QLCS-TYPE TORNADO CANNOT BE  
RULED OUT AS LEADING EDGE ROLLS DOWN VORTICITY-ENHANCED WARM FRONT.  
REF SPC MESOSCALE DISCUSSION 255 FOR DETAILS. COLD POOL MAY SUPPORT  
ADDITIONAL CONVECTIVE DEVELOPMENT FARTHER E ALONG WARM FRONT THIS  
MORNING OVER PORTIONS LOWER OH VALLEY REGION...WITH AT LEAST MRGL  
WIND-DAMAGE RISK.  
 
ADDITIONAL CONVECTION HAS DEVELOPED FARTHER SW...OVER PORTIONS  
N-CENTRAL TX. ACTIVITY INITIALLY APPEARED ROOTED IN LAYER OF  
ELEVATED INFLOW BELOW VERY STEEP EML-SUPPLIED/DCVA-ENHANCED LAPSE  
RATES AHEAD OF AFOREMENTIONED SRN-STREAM PERTURBATION. THIS  
ACTIVITY WILL OFFER RISK OF LARGE HAIL AND MAY INCREASE IN COVERAGE  
THROUGH MID-LATE MORNING. REF SPC MESOSCALE DISCUSSION 256 FOR MORE  
DETAILS. AS THIS ACTIVITY MOVES INTO WEAKER-CINH REGIME DESCRIBED  
BELOW...IT MAY ERODE CAPPING FROM ABOVE WHILE FOREGOING/INCREASINGLY  
MOIST AIR MASS HEATS DIABATICALLY.  

 

 

day1.gif

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