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Severe Potential Feb 23-24


rolltide_130

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I think a lot of people are not taking this seriously. Wayne County Schools are letting out at 11. Other counties more in the bulls eye are not flinching. Me? I just walked though and took pics of expensive items in my house....just in case.

 

I literally did the same thing last night, just in case. It had been a while.

 

I also uploaded some important digital photos to Flickr. That's a backup I had been putting off for a long time, too.

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Will probably work over the atmosphere. Certainly will keep the sun in for quite a while. We'll probably look back on this and thank that batch for moving through.

It's actually expected to cause some drying out behind it which would bring the sun out. HRRR brings sun out for Raleigh starting around 11:30 with just scattered clouds until the storms move in. Takes our temps into the low 70s and a few areas mid-70s.

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It's actually expected to cause some drying out behind it which would bring the sun out. HRRR brings sun out for Raleigh starting around 11:30 with just scattered clouds until the storms move in. Takes our temps into the low 70s and a few areas mid-70s.

 

Hmmmm....ok.  What's the best non-pay link to the HRRR?  I'll just look at it, instead of making wild speculation. :)

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Will probably work over the atmosphere.  Certainly will keep the sun in for quite a while.  We'll probably look back on this and thank that batch for moving through.

 

 

It's actually expected to cause some drying out behind it which would bring the sun out. HRRR brings sun out for Raleigh starting around 11:30 with just scattered clouds until the storms move in. Takes our temps into the low 70s and a few areas mid-70s.

 

Isn't that what happened yesterday in LA? Folks were hoping the early showers would calm things down, but it ended up making it worse.

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Lead line should be the best chance of tornadoes. Pattern recognition favors it. High Res models also favor the lead line. NAM has best 925 mb winds, a proxy for mesocyclones, lead line. HRRR reflectivity appears to favor back line, but HRRR updraft helicity is best lead line. Also HRRR will become more valuable 15Z run and later. 12Z hi-res NAM looks good attm.

 

Of course either line will have all severe threats. I'd just chase the lead line. Appears visibility will be reasonable lead, but vis will be better back line. Since I'm virtual desk chasing I have the freedom to switch horses midway through, lol.

 

Like SPC switching to 15% TOR for the MDT risk. No clear 45% wind with a broken line. Warm front and wedge both retreating remind me of a Plains outflow boundary and warm front. Lots of intersecting boundaries are in play today. Also have a pre-frontal trough ahead of cold front.

 

For chasing I might favor the OFB Plains I like the warm front at least early today. Basically I like the more south one. Wedge might be a focus later if enough clearing. Look for the intersection of the WF and pre-frontal trough if chasing. Said intersection triggered the first SC tornado warning today. Again retreating wedge may be a bigger threat later this afternoon.

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I'm in Lincolnton NC 40 miles NW of CLT. The temperature went up so quickly, along with dew points, the outside panes on my windows fogged up. We started the morning in the low 40s. We are now at 60 with steadily increasing winds. In and out of sunshine right now.

Sent from my iPad using Tapatalk

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RAH update...

AS OF 956 AM WEDNESDAY...

...STRONG WINDS AND SEVERE THUNDERSTORMS LIKELY TODAY...

WEDGE HAS ERODED OUT OF ALL BUT THE FAR NORTHWEST PIEDMONT COUNTIES

THIS MORNING...SETTING TABLE FOR SOME MODEST DESTABILIZATION HEADING

INTO THE AFTERNOON. WINDS HAVE BEEN ON THE UPTICK DUE TO THE MIXING

...WITH GUSTS EXCEEDING 30 MPH BECOMING MORE NUMEROUS. SOME MINOR

UPDATES TO REFLECT TIMING OF THESE TRENDS ARE IN ORDER...OTHERWISE

THE SEVERE THREAT IS ON TRACK PER DISCUSSION BELOW.

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MHX has a more lengthy update...

 

***MOST OF EASTERN NC IS IN A MODERATE THREAT FOR SEVERE WEATHER
WITH THE REMAINDER IN AN ENHANCED RISK***

STILL LOOKS LIKE A MAJOR SEVERE WEATHER OUTBREAK ON TRACK FOR
TODAY AS STRONG DYNAMICS/KINEMATICS OVERSPREAD AN INCREASINGLY
MOIST AND UNSTABLE AIRMASS ACROSS CENTRAL AND EASTERN NC. BECAUSE
OF THIS THE SPC HAS EXPANDED THE MODERATE SEVERE WEATHER OUTLOOK
FURTHER EAST ACROSS MOST OF EASTERN NC FOR THIS AFTERNOON/EVENING.
THIS MEANS THAT THERE IS A GOOD CHANCE OF A HIGH END SEVERE
WEATHER EVENT ACROSS THE AREA (>=EF2 TORNADO AND WIND GUSTS IN
EXCESS OF 70 MPH).


THE WARM FRONT HAS MOVED NORTHWEST THROUGH THE AREA AND HAS
SCOURED OUT THE WEDGE AIRMASS WITH SOUTHEASTERLY SURFACE WINDS AND
TEMPERATURES WARMING THROUGH THE 60S. STRONG VERTICALLY ALIGNED
LOW PRESSURE WILL MOVE FROM THE TN/OHIO VALLEY REGION TO THE
LOWER GREAT LAKES THROUGH TONIGHT. ONGOING CONVECTION APPEARS TO
BE ASSOCIATED WITH NOSE OF LOW LEVEL JET SURGING ACROSS THE MID
ATLANTIC THIS MORNING. THIS ACTIVITY SHOULD PERSIST THROUGH ABOUT
16Z THEN WE SHOULD GET ABOUT A 2 HOUR REPREIVE/TIME FOR THE
ATMOSPHERE TO RECOVER/ BEFORE STRONG TO SEVERE THUNDERSTORMS
DEVELOP IN A REGION OF BROAD SURFACE CONFLUENCE ACROSS
CENTRAL/EASTERN NC WELL IN ADVANCE OF THE SURFACE COLD FRONT.

WIND FIELDS WILL BE INCREASING THIS AFTERNOON-EARLY EVENING WITH
THE 850 MB JET EXPECTED AROUND 70 KT AND THE 500 MB JET AROUND 100
KT! THIS IN CONJUNCTION WITH STRONG WARM ADVECTION WILL LEAD TO
FORCING FOR STRONG ASCENT AND THIS SHOULD HELP TO OVERCOME ANY
INHIBITING FACTORS FROM THIS MORNINGS CONVECTION/CLOUD COVER.
FORECAST LI`S DROP TO -3/-5 AND MUCAPES 500/1000 J/KG WITH ALL
THE SHEAR PARAMETERS OFF THE CHARTS INDICATING THE LIKELIHOOD OF
SUPERCELL THUNDERSTORMS THAT WOULD SUPPORT TORNADO-GENESIS. THE
SPC TORNADO CLIMO WHISKER PLOTS BASED OFF THE 12 KM-NAM SUPPORT
THE POTENTIAL FOR A EF2-EF3 TORNADO.
THE HIGH RESOLUTION WRF-NMMM
AND NSSL-WRF ALSO INDICATE THAT CONVECTIVE MODE WILL INITIALIZE AS
SUPERCELLS AFTER 18Z THEN TRANSITION TO BOWING LINES/SEGMENTS
ESPECIALLY ALONG THE APPROACHING COLD FRONT AFTER 00Z. MAIN
THREATS WILL BE DAMAGING WIND GUSTS AND ISOLATED TORNADOES.

TIMING OF BEST SEVERE WEATHER THREAT WILL BE 18Z-03Z WITH THREAT
BEGINNING OVER THE COASTAL PLAIN THEN ENDING ALONG THE OUTER BANKS
LATER THIS EVENING.

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More from MHX

 

1019 AM EST WED FEB 24 2016

...AN OUTBREAK OF SEVERE THUNDERSTORMS WITH THE POTENTIAL FOR
EXTREME WIND GUSTS IN EXCESS OF 70 MPH AND ISOLATED STRONG
TORNADOES IS EXPECTED TODAY ACROSS EASTERN NORTH CAROLINA...

STRONG WIND SHEAR, DEEP MOISTURE AND INSTABILITY WILL COMBINE
OVER EASTERN NORTH CAROLINA THIS AFTERNOON AND EVENING AS A STRONG
COLD FRONT APPROACHES THEN MOVES THROUGH THE AREA. THIS WILL LEAD
TO THE DEVELOPMENT OF SEVERE THUNDERSTORMS ACROSS EASTERN NORTH
CAROLINA AROUND 1 PM THIS AFTERNOON WITH ACTIVITY CONTINUING
ACROSS THE REGION UNTIL AROUND 10 PM THIS EVENING.

THUNDERSTORMS WILL BE CAPABLE OF PRODUCING WIND GUSTS OF 70 TO AS
MUCH AS 100 MPH
THAT COULD PRODUCE DAMAGE SIMILAR TO A TORNADO.
ISOLATED STRONG TORNADOES ARE ALSO POSSIBLE WITH WINDS IN EXCESS
OF 100 MPH. THIS COULD RESULT IN SIGNIFICANT STRUCTURAL DAMAGE AND
DOWNED TREES AND POWER LINES. PEOPLE ARE ADVISED TO REACT TO ANY
SEVERE THUNDERSTORM OR TORNADO WARNINGS WITH THE HIGHEST URGENCY
DUE TO THE POTENTIAL FOR SIGNIFICANT IMPACTS.

WE EXPECT THAT A SEVERE WEATHER WATCH WILL BE ISSUED THIS
AFTERNOON.
A WATCH MEANS THAT CONDITIONS ARE FAVORABLE FOR SEVERE
WEATHER TO DEVELOP IN AND NEAR THE WATCH AREA AND PEOPLE SHOULD
BEGIN TO MONITOR WEATHER CONDITIONS CLOSELY.

IF SEVERE WEATHER IS IMMINENT, WARNINGS WILL BE ISSUED AND
RESIDENTS SHOULD THEN SEEK SHELTER IN A SAFE LOCATION IMMEDIATELY.

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