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Weather Disco for April 9, 2011


Wow

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Cloud cover still around so far, keeping it coolish. Hopefully the sun will break through soon. Supposed to get close to 80 but not sure if that'll be happening.

It looks like you're getting more into the cooler sector. I'm sunny and 70. Huge contrast gradient with this wedge front, which will help drive the storms as they organize and actually develop more and more southbound once they hit the Apps this afternoon. Looks like a good setup for repeating severe cells and training near the tmb front. This kind of setup in the past in April is almost always a severe weather maker for the western halves of the Carolinas, esp. the closer to the front you are. I'm expecting some vicious hailers around this afternoon and early evening and in the stronger updrafts cores, and high winds again. Just now getting this county cleaned up, but tons of debris still on almost every street or neighborhood.

post-38-0-93634700-1302358271.jpg

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75 degrees at my house.

This is the Hazardous Weather Outlook issued by GSP:

1102 AM EDT SAT APR 9 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST GEORGIA...PIEDMONTNORTH CAROLINA...WESTERN NORTH CAROLINA AND UPSTATE SOUTH CAROLINA..

DAY ONE...TODAY AND TONIGHT.

NUMEROUS THUNDERSTORMS ARE EXPECTED TO DEVELOP OVER THE WESTERNCAROLINAS AND NORTHEAST GEORGIA THIS AFTERNOON THROUGH EARLY THISEVENING AS A STRONG UPPER DISTURBANCE CROSSES THE REGION. THEATMOSPHERE WILL BECOME QUITE UNSTABLE THIS AFTERNOON...AND MANYOF THE STORMS ARE EXPECTED TO BECOME SEVERE. LARGE HAIL ANDDAMAGING WINDS SHOULD BE THE MAIN THREAT FROM ANY SEVERE STORMSTHAT DEVELOP. SOME OF THE STORMS WILL BE CAPABLE OF PRODUCINGUNUSUALLY LARGE HAIL FOR THIS PART OF THE COUNTRY...AS WELL ASLONG SWATHS OF WIND DAMAGE. THE THUNDERSTORMS SHOULD START OVERTHE MOUNTAINS BY MID AFTERNOON AND QUICKLY SPREAD EASTWARD ACROSSTHE FOOTHILLS AND PIEDMONT.

I'll probably head out and see what I can see when they roll in this afternoon...

(edited for spelling)

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We should see that MCV feature progress eastward for the afternoon hours. The combination of weak forcing with the instability from daytime heating, strong shear, the strengthening of the low level jet and high lapse rate values nearing 8°C/KM (the NAM in particular indicating this) will all be present and should suffice to develop some powerful severe cells. Already this tells me that we could experience, once more, strong wind gusts around 60+mph (which should be the top threat), intense CG/CC lightning and large hail approaching 2" in diameter with aid of strong updraft in extreme cases. I don't really see a lot of super-cellular development occurring at this point but some folks just might get in on something tornadic in the areas supportive of an environment featuring strong low-level convergence/ impressive 0-6km bulk shear.

For the record, the WSI-RPM model last night showed a very nasty line of storms occurring along parts of southern and western NC. Almost in similarity of strength to our previous severe event...Currently 74 with sunny skies.

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83/66 currently imby

DAY 1 CONVECTIVE OUTLOOK

NWS STORM PREDICTION CENTER NORMAN OK

1121 AM CDT SAT APR 09 2011

VALID 091630Z - 101200Z

...THERE IS A MDT RISK OF SVR TSTMS FROM EXTREME SERN SD NERN NE

ACROSS SRN MN AND NRN IA INTO SWRN WI...

...THERE IS A SLGT RISK OF SVR TSTMS SURROUNDING THE MDT RISK FROM

CNTRL MN/WI...SWWD ACROSS SERN NEB INTO NWRN TX...

...THERE IS A SLGT RISK OF SVR TSTMS FROM ERN KY/TN SEWD INTO WRN NC

AND SC/NERN GA...

...SYNOPSIS...

MAJOR WRN TROF WILL START ITS EWD MOVE WITH A VERY STRONG JET

DRIVING NEWD ACROSS THE HIGH PLAINS TOWARD THE UPPER MS VALLEY

OVERNIGHT. SURFACE LOW DEVELOPING OVER CENTRAL HIGH PLAINS WILL

DEEPEN NEWD ACROSS NEB BY THIS EVENING MOVING INTO SWRN MN BY 12Z

SUN. STRONG SLY FLOW WILL CONTINUE TO SPREAD A MOIST AND

POTENTIALLY VERY UNSTABLE AIR MASS NWD THRU THE SRN/CENTRAL PLAINS

AS WARM FRONT CURRENTLY SRN NEB TO NRN MO LIFTS NWD.

FURTHER EAST A WELL DEVELOPED MCS OVER LOWER OH VALLEY WILL TURN S

OF E ON THE E SIDE OF RIDGE MOVING ACROSS CENTRAL U.S. A MOIST AND

VERY UNSTABLE AIR MASS DOWNSTREAM SEWD ACROSS APPALACHIANS INTO

CAROLINAS COUPLED WITH THE OBSERVED MID LEVEL JET OF 50-60KT WILL

SUPPORT AN ACTIVE SEVERE THUNDERSTORM PERIOD THIS AFTERNOON AND

EVENING.

...ERN KY/TN SEWD THRU THE CAROLINAS...

AS THE AIR MASS HEATS DOWNSTREAM FROM THE MCS AIR MASS EXPECTED TO

BECOME STRONGLY UNSTABLE SEWD ACROSS ERN KY/TN INTO CAROLINAS TO THE

S OF THE BACKDOOR COLD FRONT. COLD FRONT CURRENTLY AGAINST THE

MOUNTAINS NRN NC THEN SEWD ALONG SC/NC BORDER SHOULD SLOW AND BE THE

NWD LIMIT OF THE GREATER SEVERE THUNDERSTORM THREAT THIS AFTERNOON.

THE CURRENT LINE OF SEVERE THUNDERSTORMS ASSOCIATED WITH THE MCS OH

RIVER INTO NRN KY EXPECTED TO REDEVELOP SEWD INTO AREA OF GREATEST

INSTABILITY THIS AFTERNOON. WITH MLCAPES RANGING UPWARDS TO 2500

J/KG AND THE 50-60KT OF BRN SHEAR THUNDERSTORMS SHOULD INCREASE AND

EVOLVE INTO LINE SEGMENTS AND BOWS. ALONG WITH THE WIND DAMAGE

CONCERN...LARGE HAIL WILL ALSO ACCOMPANY THE STRONGEST UPDRAFTS.

SHEAR SUFFICIENT FOR SUPERCELL STRUCTURES INCLUDING A TORNADO

THREAT...PARTICULARLY WITH ANY MORE DISCRETE STORM THAT DEVELOPS.

ONE FAVORED AREA WOULD BE THE ENHANCED LOW LEVEL CONVERGENCE

VICINITY BACKDOOR FRONT CAROLINAS.

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I wouldn't be surprised to see the severe threat a little larger than I have shown

post-38-0-12193800-1302358759.jpg

Was really wanting to be outside all day today, but if it's gonna rain hopefully it'll be severe. I had family in Lattimore that didn't get power back on till Thursday from the storm Tue. morning

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well , FOLKS got a nice surprise for the Azalea Festival here in ILM,this morning & today setting @ 56 and cloudy...(My GF went dressed for *warm* temps came back a Icicle, lol) :whistle:

Heard some thunder around 12am and again @ 3 am.. Loud enough too shake the house..

people were not happy at the parade,,, Leaving 1/2 way through the "Parade",,, because no-one was dressed for it, in T-shirts etc...

Plus, because everyone, took the Weather forecast ad vertabium.... and dressed; for nice sunshine AND 75/80 degree forcasted temps....:sun:

BUST!...... :yikes:

currently 57, cloudy...

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It begins....

SEVERE WEATHER STATEMENT

NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC

136 PM EDT SAT APR 9 2011

NCC021-111-199-091815-

/O.CON.KGSP.SV.W.0049.000000T0000Z-110409T1815Z/

BUNCOMBE NC-YANCEY NC-MCDOWELL NC-

136 PM EDT SAT APR 9 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 215 PM EDT

FOR SOUTHWESTERN MCDOWELL...SOUTH CENTRAL YANCEY AND NORTHEASTERN

BUNCOMBE COUNTIES...

AT 129 PM EDT...A SEVERE THUNDERSTORM WAS REPORTED CAPABLE OF

PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.

THIS STORM WAS LOCATED 7 MILES NORTH OF SWANNANOA...OR 10 MILES

NORTHEAST OF DOWNTOWN ASHEVILLE...MOVING EAST AT 20 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO BLACK

MOUNTAIN...MONTREAT AND OLD FORT

SEVERE THUNDERSTORM WARNING

NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC

138 PM EDT SAT APR 9 2011

THE NATIONAL WEATHER SERVICE IN GREENVILLE-SPARTANBURG HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...

SOUTHEASTERN MITCHELL COUNTY IN WESTERN NORTH CAROLINA...

SOUTHEASTERN YANCEY COUNTY IN WESTERN NORTH CAROLINA...

NORTHERN MCDOWELL COUNTY IN WESTERN NORTH CAROLINA...

* UNTIL 230 PM EDT

* AT 134 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A

SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND

DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR

MOUNT MITCHELL STATE PARK...OR 8 MILES SOUTH OF BURNSVILLE...MOVING

EAST AT 25 MPH.

* LOCATIONS IMPACTED INCLUDE...

BUSICK...CELO AND MICAVILLE...

LEDGER...

WOODLAWN AND SPRUCE PINE...

LAKE JAMES...

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Latest Mesoscale discussion from SPC http://www.spc.noaa.gov/products/md/md0385.html

mcd0385.gif

MESOSCALE DISCUSSION 0385

NWS STORM PREDICTION CENTER NORMAN OK

1234 PM CDT SAT APR 09 2011

AREAS AFFECTED...NERN GA THROUGH SC

CONCERNING...SEVERE POTENTIAL...WATCH LIKELY

VALID 091734Z - 091900Z

STORMS ARE EXPECTED TO DEVELOP FROM NERN GA INTO SC THIS AFTERNOON.

SUPERCELLS AND BOWING SEGMENTS WITH ISOLATED LARGE HAIL AND DAMAGING

WIND WILL BE THE MAIN THREATS. WW WILL LIKELY BE NEEDED SOON.

STRONG DIABATIC WARMING HAS BOOSTED TEMPERATURES INTO THE 80S FROM

NERN GA INTO SC WHICH IN CONJUNCTION WITH MID-UPPER 60S DEWPOINTS

AND 7-7.5 MID LEVEL LAPSE RATES ARE CONTRIBUTING TO 2000-2500 J/KG

MLCAPE. OBJECTIVE ANALYSIS INDICATE CINH IS WEAKENING...AND

THUNDERSTORM INITIATION MAY BECOME IMMINENT BY 18-19Z. POTENTIAL

WILL EXIST FOR STORMS TO DEVELOP ALONG BACKDOOR FRONT MOVING WWD

THROUGH NERN SC AS WELL AS OVER THE HIGHER TERRAIN FROM NERN GA INTO

SWRN NC AND WRN SC...AND SUBSEQUENTLY MOVE SEWD. VERTICAL SHEAR TO

50 KT WILL SUPPORT SUPERCELLS AND BOWING SEGMENTS.

..DIAL.. 04/09/2011

ATTN...WFO...CHS...CAE...GSP...FFC...

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Still right in that small transition zone. Front is probably right over us. About 60 degrees and the sun is close to breaking out at times. Just can't seem to do it. Looking like we'll be right off the NE edge of the good stuff.

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Tornado Watch just made effective about 4 minutes ago for the NC mountain and foothills areas:

EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 200 PM UNTIL

900 PM EDT.

TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.

DISCUSSION...SUPERCELLS ARE DEVELOPING AHEAD OF THE MCS AND

ASSOCIATED BAND OF STRONG MID LEVEL JET. WITH AVAILABLE INSTABILITY

TORNADO THREAT HAS INCREASED AND WATCH 112 HAS BEEN UPGRADED TO A

TORNADO WATCH.

ww0113_radar_big.gif

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79 and thunderstorms in the area in Asheville. 54 and cloudy in Raleigh. Craziness. My nose was running and I could see my breath this morning during the Triangle MS Walk.

The storms have stayed just barely north. I could see the repeated lightning strikes. I would say Don got nailed pretty hard in Weaverville.

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today is the first day since last Fall when the humidity and temp. combined really felt muggy. Dewpoint was mid 60's and now 62, when the temp was almost 80. Now high clouds are here and the temp is still 78, as my area is directly bisected from the cooler airmass east and ne, and much warmer just west. Hopefully some showers hit, but I could do without any severe. Looks like much of the I-40 area is about to get it.

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Very powerful cell currently taking place areas east of Crossnore, NC. 55 kg/m² VIL (don't think I've ever seen a value that high) with 100% severe hail. Last measured at 2.25" in diameter!

EDIT(2:46PM):

A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 9:00PM EDT SATURDAY, APRIL 09

Event Start: Saturday, April 09, 2011 2:45 PM EDT

Event End: Saturday, April 09, 2011 9:00 PM EDT

Nc

. North Carolina Counties Included Are

Alexander Anson Cabarrus

Catawba Cleveland Gaston

Iredell Lincoln Mecklenburg

Rowan Stanly Union

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Very powerful cell currently taking place areas east of Crossnore, NC. 55 kg/m² VIL (don't think I've ever seen a value that high) with 100% severe hail. Last measured at 2.25" in diameter!

I was just lookng at the same thing, Several cells coming right off the escarpment are building over 45K feet, and the db are high. I'm sure there are major hailers in that. If you look at the regional radar in motion, you get the sense that development will continue right over the Apps the next several hours, building down to northenr GA and western SC I think. The WRF then slams a line, veering its heading suddenly as the whole conglomeration is in central NC, meaning a powerful derecho type line can't be ruled out. Something interesting is about to happen it appears.

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Its a steamy 88/64 at the moment :sun:

URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 114

NWS STORM PREDICTION CENTER NORMAN OK

245 PM EDT SAT APR 9 2011

THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

PARTS OF EASTERN GEORGIA

PARTS OF WESTERN NORTH CAROLINA

MUCH OF SOUTH CAROLINA

COASTAL WATERS

EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 245 PM UNTIL

900 PM EDT.

HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 85

STATUTE MILES EITHER SIDE OF A LINE FROM 15 MILES NORTH NORTHEAST

OF ASHEVILLE NORTH CAROLINA TO 45 MILES SOUTH SOUTHEAST OF

CHARLESTON SOUTH CAROLINA. FOR A COMPLETE DEPICTION OF THE WATCH

SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE

FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY

DO PRODUCE TORNADOES.

OTHER WATCH INFORMATION...CONTINUE...WW 113...

DISCUSSION...THUNDERSTORMS WILL INCREASE IN NUMBER AND INTENSITY

ACROSS THE WATCH AREA THRU THE AFTERNOON AS A STRONGLY UNSTABLE AIR

MASS NOW UNCAPPED REF 17Z CHS SOUNDING. PRIMARY THREAT WILL BE

LARGE HAIL AND DAMAGING WINDS AS STORMS DEVELOP UPSCALE INTO LINE

SEGMENTS. ADDITIONALLY SUPERCELLS ARE POSSIBLE GIVEN THE FAVORABLE

DEEP LAYER SHEAR ENHANCING BOTH THE LARGE HAIL THREAT ALONG WITH

ISOLATED TORNADOES.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 29025.

...HALES

ww0114_radar.gif

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More detail regarding the Severe Thunderstorm Watch:

Hail To 2 Inches In Diameter... Thunderstorm Wind Gusts To 70

Mph... And Dangerous Lightning Are Possible In These Areas.

Discussion... Thunderstorms Will Increase In Number And Intensity

Across The Watch Area Thru The Afternoon As A Strongly Unstable Air

Mass Now Uncapped Ref 17z Chs Sounding. Primary Threat Will Be

Large Hail And Damaging Winds As Storms Develop Upscale Into Line

Segments. Additionally Supercells Are Possible Given The Favorable

Deep Layer Shear Enhancing Both The Large Hail Threat Along With

Isolated Tornadoes.

Deja vu, anyone? That would make it an exact repeat of the previous severe event that some of us are still cleaning up after.

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