Jump to content
  • Member Statistics

    17,609
    Total Members
    7,904
    Most Online
    NH8550
    Newest Member
    NH8550
    Joined

Severe Potential Feb 23-24


rolltide_130

Recommended Posts

  • Replies 1.1k
  • Created
  • Last Reply

EVERE WEATHER STATEMENT  
NATIONAL WEATHER SERVICE NEW ORLEANS LA  
1248 PM CST TUE FEB 23 2016  
 
LAC063-091-105-231915-  
/O.CON.KLIX.TO.W.0024.000000T0000Z-160223T1915Z/  
TANGIPAHOA LA-LIVINGSTON LA-ST. HELENA LA-  
1248 PM CST TUE FEB 23 2016  
 
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 115 PM CST FOR WEST  
CENTRAL TANGIPAHOA...NORTH CENTRAL LIVINGSTON AND SOUTHEASTERN ST.  
HELENA PARISHES...  
 
AT 1248 PM CST...A CONFIRMED LARGE AND EXTREMELY DANGEROUS TORNADO  
WAS LOCATED OVER LIVINGSTON...OR 14 MILES EAST OF DENHAM SPRINGS...  
MOVING NORTHEAST AT 30 MPH.  
 
THIS IS A PARTICULARLY DANGEROUS SITUATION.  

Link to comment
Share on other sites

19z: believe the storms over LA are the main show...they will move into Southern MS and AL this evening and in FL panhandle overnight..as time goes on ahead of them extreme shear with backed winds...with SBCAPE 750-1500 or so,,,

 

WAA as the low level jet increases in the next few hours may mean more storms developing east of these in a WAA wing

 

believe TOR probs will need to be raised a notch in the next update

 

behind these more storms will develop but winds veer SW more linear stuff...unless winds can back some

Link to comment
Share on other sites

Going to need a new WW east/northeast of the current one PDQ. Those two leading supercells are pretty isolated with nothing in front of them, should be quite a show. Usually am pretty skeptical about these setups when instability isn't that important, but obviously that isn't going to stop these things.

Link to comment
Share on other sites

19z: believe the storms over LA are the main show...they will move into Southern MS and AL this evening and in FL panhandle overnight..as time goes on ahead of them extreme shear with backed winds...with SBCAPE 750-1500 or so,,,

 

WAA as the low level jet increases in the next few hours may mean more storms developing east of these in a WAA wing

 

believe TOR probs will need to be raised a notch in the next update

 

behind these more storms will develop but winds veer SW more linear stuff...unless winds can back some

 

If they did, then it'd be in high risk territory; I don't think SPC will be ready to do that just yet.

Link to comment
Share on other sites

ESOSCALE DISCUSSION 0126  
NWS STORM PREDICTION CENTER NORMAN OK  
0115 PM CST TUE FEB 23 2016  
 
AREAS AFFECTED...PORTIONS OF CNTRL/SRN MS...SERN LA...SWRN/S-CNTRL  
AL...WRN FL PANHANDLE  
 
CONCERNING...SEVERE POTENTIAL...TORNADO WATCH LIKELY  

 
VALID 231915Z - 232115Z  

 
PROBABILITY OF WATCH ISSUANCE...95 PERCENT  
 
SUMMARY...THE RISK FOR TORNADOES WILL BE FURTHER INCREASING DURING  
THE NEXT COUPLE OF HOURS ACROSS PARTS OF SERN LA INTO CNTRL/SRN  
MS...WITH THE TORNADO RISK SPREADING INTO SWRN/S-CNTRL AL AND THE  
WRN FL PANHANDLE BY THIS EVENING. SIGNIFICANT TORNADOES WILL BE  
POSSIBLE. A NEW TORNADO WATCH WILL LIKELY BE ISSUED BY AROUND 21Z.  
 
DISCUSSION...STRONG LARGE-SCALE ASCENT REFLECTED BY 2-HOUR PRESSURE  
FALLS OF 2.0-3.5 MB ARE ANALYZED AHEAD OF A SFC LOW CENTERED N OF  
LUFKIN TX. A PLUME OF GULF MOISTURE CONTINUES TO STREAM NWD TO A  
WARM FRONT BRANCHING E/ENE OF THE LOW INTO THE ARKLAMISS REGION AND  
EWD...ASSOCIATED WITH DEWPOINTS IN THE MIDDLE AND UPPER 60S. POCKETS  
OF MODEST INSOLATION WILL CONTINUE TO FOSTER DESTABILIZATION S OF  
THIS BOUNDARY...WITH THE STRONGEST INSTABILITY /MLCAPE AROUND  
500-1000 J PER KG SOUTH OF INTERSTATE 20/.  
 
MIXED-MODE CONVECTION -- INCLUDING TORNADIC SUPERCELLS -- CONTINUES  
EVOLVING ACROSS PARTS OF SRN LA...AS ADDRESSED IN RECENTLY ISSUED  
MCD 0125. THIS ACTIVITY WILL CONTINUE TO SPREAD NNEWD/NEWD THIS  
AFTERNOON AMIDST A DESTABILIZING BOUNDARY LAYER...EVENTUALLY  
EXTENDING N OF WW 19 PERHAPS AS EARLY AS 20-21Z. LATER...THE RISK  
FOR SVR CONVECTION INCLUDING TORNADOES WILL SPREAD EWD INTO PARTS OF  
SWRN AL AND THE FL PANHANDLE BY EVENING. LONG/CURVED HODOGRAPHS HAVE  
ALREADY BECOME FAVORABLE FOR TORNADIC SUPERCELLS ACROSS THE  
REGION...WITH LOW-LEVEL SRH POTENTIALLY EXCEEDING 500 M2/S2 FROM  
SERN MS AND POINTS EWD THIS EVENING AS H85 SLYS INCREASE TO 50-65  
KT. SIGNIFICANT TORNADOES WILL BE POSSIBLE BY LATE AFTERNOON INTO  
THE EVENING -- ESPECIALLY FROM SERN MS INTO SWRN/S-CNTRL AL AND THE  
FL PANHANDLE.  
 

Link to comment
Share on other sites

19z: believe the storms over LA are the main show...they will move into Southern MS and AL this evening and in FL panhandle overnight..as time goes on ahead of them extreme shear with backed winds...with SBCAPE 750-1500 or so,,,

 

WAA as the low level jet increases in the next few hours may mean more storms developing east of these in a WAA wing

 

believe TOR probs will need to be raised a notch in the next update

 

behind these more storms will develop but winds veer SW more linear stuff...unless winds can back some

I don't get why you're saying those supercells will be the main show. This cluster is going to push northeast, and big storms will form everywhere around it. I think the biggest show will be with storms that form in the clearing near New Orleans as that clearing pushes northeast back into the States. I'm certainly no expert, but it seems this is usually the case. 

post-13588-0-74798000-1456255454_thumb.p

Link to comment
Share on other sites

I don't get why you're saying those supercells will be the main show. This cluster is going to push northeast, and big storms will form everywhere around it. I think the biggest show will be with storms that form in the clearing near New Orleans as that clearing pushes northeast back into the States.

 

these current storms may disrupt inflow/moisture for anything back WNW ..

 

..they are a little ahead of schedule 

 

I have seen  many times when this happens in otherwise great set ups

 

Could be wrong time will tell

Link to comment
Share on other sites

these current storms may disrupt inflow/moisture for anything back WNW ..

 

..they are a little ahead of schedule 

 

I have seen  many times when this happens in otherwise great set ups

 

Could be wrong time will tell

Well, yeah, anything west or north of that cluster is probably done... but anything east/south/northeast of it is fair game. 

Link to comment
Share on other sites

HIGH risk upgrade possible

 

 

AY 1 CONVECTIVE OUTLOOK  
NWS STORM PREDICTION CENTER NORMAN OK  
0200 PM CST TUE FEB 23 2016  
 
VALID 232000Z - 241200Z  

 
...THERE IS A MDT RISK OF SVR TSTMS THIS AFTERNOON THROUGH TONIGHT  
FROM SE LA ACROSS SRN MS...SRN AL...THE FL PANHANDLE AND EXTREME SW  
GA...  
   
..THERE IS AN ENH RISK OF SVR TSTMS SURROUNDING THE MDT RISK
 
FROM  
WRN GA TO CENTRAL LA AND MS/AL/WRN GA...  
   
..THERE IS A SLGT RISK OF SVR TSTMS SURROUNDING THE ENH RISK
 
FROM  
EXTREME SE TX TO NRN MS/AL...MUCH OF GA...AND INTO N FL...  
 
...THERE IS A MRGL RISK OF SVR TSTMS SURROUNDING THE SLGT  
RISK...FROM SE TX TO SRN TN TO THE GA/SC BORDER AND NE FL...  
   
..SUMMARY
 
 
SEVERE THUNDERSTORMS CAPABLE OF PRODUCING TORNADOES...DAMAGING  
WINDS...AND ISOLATED LARGE HAIL WILL BE LIKELY OVER PORTIONS OF THE  
GULF COAST STATES THROUGH TONIGHT. SEVERAL STRONG TORNADOES WILL BE  
POSSIBLE.  
 
THE ONLY NOTABLE CHANGE THIS OUTLOOK UPDATE IS TO REDUCE/REMOVE  
PROBABILITIES ON THE WRN AND NWRN PORTION OF THE SEVERE OUTLOOK  
ACROSS TX/LA/MS.  
 
CONFIDENCE IS RELATIVELY HIGH ON THE FORECAST EVOLUTION IN A MARKED  
INTENSIFICATION IN SHEAR PROFILES ACROSS FAR SERN MS AND EXTENDING  
ENEWD INTO SRN AL BY EARLY EVENING AND INTO THE OVERNIGHT. THIS  
WILL POTENTIALLY RESULT IN MORE FAVORABLE CONDITIONS FOR TORNADIC  
SUPERCELLS. CONVECTION-ALLOWING MODEL GUIDANCE --ESPECIALLY RECENT  
HRRR RUNS-- ARE IN GOOD AGREEMENT IN SHOWING A CLUSTER OF  
SEMI-DISCRETE CELLS /I.E. SUPERCELLS/ DEVELOPING IN THE WARM SECTOR  
TRAVERSING ENEWD FROM SRN MS INTO SRN AL. HOWEVER...DETAILS  
CONCERNING THE EVOLUTION OF WARM SECTOR STORMS REMAIN UNCLEAR BUT  
AN UPGRADE TO HIGH RISK MAY BE WARRANTED AT A LATER OUTLOOK UPDATE  
FOR A SMALL PORTION OF THE MODERATE RISK /I.E. SRN AL/.  

 
..SMITH.. 02/23/2016  
   
PREV DISCUSSION
 
/ISSUED 1030 AM CST TUE FEB 23 2016/  
   
..SYNOPSIS
 
 
AN INTENSE SHORTWAVE TROUGH AND ASSOCIATED MID-UPPER JET STREAK WILL  
PROGRESS EWD OVER THE GULF COAST STATES THROUGH TONIGHT. STRONG  
ASCENT IN THE LEFT EXIT REGION OF THE JET WILL CONTRIBUTE TO STRONG  
CYCLOGENESIS FROM E TX THIS MORNING NEWD TO TN OVERNIGHT. IN  
RESPONSE TO THE DEEPENING CYCLONE...LOW-LEVEL SLY FLOW WILL INCREASE  
/ESPECIALLY TONIGHT/ AND THE WARM SECTOR WILL SPREAD INLAND...THOUGH  
THE N EDGE OF THE MORE UNSTABLE WARM SECTOR WILL BE MODULATED BY THE  
INFLUENCE OF CLOUDS/RAIN.  
   
..LOWER MS VALLEY INTO GA/N FL THROUGH TONIGHT
 
 
THE ONGOING RAIN/CONVECTION ACROSS LA IS A BIT FASTER THAN EARLIER  
FORECAST...AND IT APPEARS THE PRIMARY WARM SECTOR WILL ONLY BECOME  
ESTABLISHED FROM SE LA AND SRN MS EWD TODAY. STRENGTHENING OF  
LOW-LEVEL FLOW/SHEAR IS EXPECTED LATE THIS AFTERNOON INTO  
TONIGHT...WITH THE MORE FAVORABLE SUPERCELL PROFILES EXPECTED  
BEGINNING THIS EVENING ON THE E EDGE OF THE ONGOING CONVECTION...AND  
SPREADING EWD OVERNIGHT. THOUGH BUOYANCY WILL NOT BE PARTICULARLY  
LARGE INLAND...THE VERY STRONG LOW-LEVEL SHEAR /EFFECTIVE SRH  
300-600 M2 PER S2/ AND STRONG DEEP-LAYER SHEAR WITH LARGE  
CROSS-BOUNDARY FLOW WILL PROMOTE PRE-FRONTAL CLUSTERS OF CELLS AND A  
BROKEN BAND OF STORMS ALONG THE COLD FRONT. SINCE THE WARM SECTOR  
WILL BE BETTER ESTABLISHED FARTHER E TODAY ACROSS SRN AL TO N  
FL...IT APPEARS LIKELY THAT CONVECTION WILL PERSIST AND MAINTAIN  
INTENSITY THROUGH EARLY WEDNESDAY. THE MORE INTENSE SUPERCELLS WILL  
BE CAPABLE OF PRODUCING STRONG TORNADOES THIS EVENING INTO  
TONIGHT...ALONG WITH DAMAGING WINDS. THE LARGE HAIL RISK WILL BE  
MORE CONFINED TO AREAS WITH STRONGER BUOYANCY AND SOMEWHAT STEEPER  
LAPSE RATES CLOSER TO THE COAST.  
   

Link to comment
Share on other sites

..SUMMARY  

 

SEVERE THUNDERSTORMS CAPABLE OF PRODUCING TORNADOES...DAMAGING  

WINDS...AND ISOLATED LARGE HAIL WILL BE LIKELY OVER PORTIONS OF THE  

GULF COAST STATES THROUGH TONIGHT. SEVERAL STRONG TORNADOES WILL BE  

POSSIBLE.  

 

THE ONLY NOTABLE CHANGE THIS OUTLOOK UPDATE IS TO REDUCE/REMOVE  

PROBABILITIES ON THE WRN AND NWRN PORTION OF THE SEVERE OUTLOOK  

ACROSS TX/LA/MS.  

 

CONFIDENCE IS RELATIVELY HIGH ON THE FORECAST EVOLUTION IN A MARKED  

INTENSIFICATION IN SHEAR PROFILES ACROSS FAR SERN MS AND EXTENDING  

ENEWD INTO SRN AL BY EARLY EVENING AND INTO THE OVERNIGHT. THIS  

WILL POTENTIALLY RESULT IN MORE FAVORABLE CONDITIONS FOR TORNADIC  

SUPERCELLS. CONVECTION-ALLOWING MODEL GUIDANCE --ESPECIALLY RECENT  

HRRR RUNS-- ARE IN GOOD AGREEMENT IN SHOWING A CLUSTER OF  

SEMI-DISCRETE CELLS /I.E. SUPERCELLS/ DEVELOPING IN THE WARM SECTOR  

TRAVERSING ENEWD FROM SRN MS INTO SRN AL. HOWEVER...DETAILS  

CONCERNING THE EVOLUTION OF WARM SECTOR STORMS REMAIN UNCLEAR BUT  

AN UPGRADE TO HIGH RISK MAY BE WARRANTED AT A LATER OUTLOOK UPDATE  

FOR A SMALL PORTION OF THE MODERATE RISK /I.E. SRN AL/.  

 

Link to comment
Share on other sites

I'm really surprised they mentioned a possible upgrade to high risk. I feel the 11/16 and/or the 12/23 event was more worthy of a mention for an upgrade to high risk (though not quite worthy of actually being high risk). The former wasn't even a moderate risk somehow.

 

The shear here is forecast to be on a whole different level than either of those two days, to be fair.

 

90/80 tor probs on that PDS watch.

Link to comment
Share on other sites

PDS tornado watch is indeed coming. SPC via FB:

 

SPC Lead Forecaster Rich Thompson has had a busy afternoon. Here are two photographs of him at work. The first shows him creating PDS Tornado Watch #20 and Tornado Watch #21. The second image shows him on a conference call with US National Weather Service Jackson MississippiUS National Weather Service New Orleans Louisiana, and US National Weather Service Mobile Alabama.

tQSWqef.jpg

Link to comment
Share on other sites

Archived

This topic is now archived and is closed to further replies.

  • Recently Browsing   0 members

    • No registered users viewing this page.

×
×
  • Create New...