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Potential thunderstorms/svr thunderstorms Thread


tombo82685

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Why? None of what you describe meets severe criteria.

What? CTG lightning doesn't mean severe? oo c'mon!:thumbsdown: lol

hoping tomorrow stays dry. Have a 11am tee time @ turtle creek and im going to break 90 (finally...maybe? nahhh)

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We don't get in a Day 4 risk too often around these parts.

DAY 4-8 CONVECTIVE OUTLOOK

NWS STORM PREDICTION CENTER NORMAN OK

0332 AM CDT SUN JUN 19 2011

VALID 221200Z - 271200Z

...DISCUSSION...

THROUGH DAY4 MODELS GENERALLY AGREE IN THE MOVEMENT OF A SIGNIFICANT

UPPER TROUGH ACROSS THE PLAINS INTO THE UPPER MS VALLEY/UPPER GREAT

LAKES REGION. THIS FEATURE WILL GENERATE A BELT OF STRONG MID-HIGH

LEVEL WINDS THAT SHOULD TRANSLATE INTO THE OH VALLEY/LOWER GREAT

LAKES...COINCIDENT WITH A MOIST/UNSTABLE BOUNDARY LAYER. IF MODELS

ARE INDEED ACCURATE IN PLACING THIS STRONG MID LEVEL FEATURE OVER WI

AT 23/00Z...IT WOULD SEEM LIKELY THAT STRONG/SEVERE THUNDERSTORMS

WILL BE POSSIBLE DOWNSTREAM WHERE DEEP LAYER SHEAR WILL BE MORE THAN

ADEQUATE FOR STORM ORGANIZATION.

BEYOND DAY4 MODELS DIVERGE IN THEIR SPEED/PLACEMENT OF THE UPPER

TROUGH...HENCE TOO MUCH UNCERTAINTY FOR A SEVERE RISK DAY5 AND

BEYOND.

..DARROW.. 06/19/2011

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Looks like our first POTENTIAL shot AS OF THE 18Z NAM of svr storm may come wednesday. With temperatures climbing towards 90 and a strong spring-like storm moving into the western great lakes a warm southerly flow will clash with a cold front approaching from the west. Instability values this far out look decent as of now. LI values in the -5 to -7 range and cape in the 2000 to 3500 range all show the potential for some severe t-storms to break out. Do to the limited shear/no shear tornadoes shouldnt be that big of a risk but a few warnings may come about. This looks like a hail and damaging wind threat.

NAM_221_2011062018_F45_PLI_30_0_MB_ABOVE_GROUND.png

NAM_221_2011062018_F45_CAPE_SURFACE.png

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Looking at the 0z NAM and 18z GFS for 22/21z and 23/00z, we see a fairly high EL, but also a rather high freezing level, which to me suggests a lower probability of hail, or at least big hail, making it all the way to the surface, since the sub-freezing area is rather high.

Both models show at least some veering from the surface to about 800mb, causing there to be at least a little bit of turning in the hodographs. Paltry by midwest standards, but I think it will be enough to send a few TOR-warnings flying here and there.

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SPC now has us in the day 2 and 3 risks.

Here's the Day 2.

DAY 2 CONVECTIVE OUTLOOK

NWS STORM PREDICTION CENTER NORMAN OK

1242 AM CDT TUE JUN 21 2011

VALID 221200Z - 231200Z

...THERE IS A SLGT RISK OF SVR TSTMS FROM THE TN VALLEY NWD TO THE

GREAT LAKES...EWD INTO THE NRN MIDDLE ATLANTIC...

...TN VALLEY TO SRN GREAT LAKES...EWD TO NRN MIDDLE ATLANTIC...

UPPER TROUGH IS EXPECTED TO SHIFT SLOWLY EWD ACROSS THE MS VALLEY

INTO THE GREAT LAKES...SWD INTO TN VALLEY REGION WEDNESDAY. THIS

EWD PROGRESSION WILL MAINTAIN MODEST MID-HIGH LEVEL SWLY FLOW ALOFT

ACROSS THE WARM SECTOR. FORECAST DEEP LAYER SHEAR IS ACTUALLY

EXPECTED TO PROVE FAVORABLE FOR ORGANIZED MULTI-CELL CLUSTERS AND

PERHAPS EVEN ISOLATED SUPERCELLS. BOTH THE NAM AND GFS SUGGEST ONE

CAVEAT FOR WIDESPREAD SEVERE ACROSS THIS REGION WILL BE THE

POTENTIAL FOR CONVECTIVE DEVELOPMENT EARLY IN THE PERIOD AHEAD OF

THE FRONT ACROSS THE TN/OH VALLEY. THIS MAY TEMPORARILY LIMIT

DESTABILIZATION BUT SHOULD NOT COMPLETELY INHIBIT STEEPER LAPSE

RATES FROM DEVELOPING...ESPECIALLY NEAR THE COLD FRONT FROM NERN AR

INTO IL/IND. ANOTHER REGION WHERE STEEP LAPSE RATES ARE LIKELY TO

DEVELOP WILL BE IN THE LEE OF THE APPALACHIANS...POTENTIALLY AS FAR

NORTH AS THE DELMARVA. NRN PLUME OF THIS ZONE OF MORE INTENSE

HEATING SHOULD RESULT IN SBCAPE VALUES WELL IN EXCESS OF 2000 J/KG.

REGARDLESS OF THE POSSIBLE COMPLEXITIES THAT MAY ARISE FROM LATE

DAY1/EARLY DAY2 CONVECTIVE PROCESSES...AMPLE SHEAR WILL OVERSPREAD

MUCH OF THE WARM SECTOR EAST OF THE MS RIVER...FROM THE TN VALLEY

NWD INTO THE GREAT LAKES. THIS FLOW REGIME WILL CERTAINLY SUPPORT

MULTIPLE CONVECTIVE SCENARIOS BUT LARGELY DRIVEN BY DAYTIME HEATING

AND FRONTAL CONVERGENCE. ALTHOUGH SHORT RANGE GUIDANCE IS NOT

PARTICULARLY AGGRESSIVE WITH DESTABILIZATION ACROSS WI AHEAD OF SFC

LOW...A FEW SEVERE TSTMS MAY BE TUCKED BENEATH THE STACKED LOW

PRESSURE SYSTEM WHERE MID LEVEL TEMPERATURES WILL BE COOLER BUT

SHEAR PROFILES SOMEWHAT MEAGER. LARGE HAIL...DAMAGING WINDS AND

PERHAPS EVEN ISOLATED TORNADOES MAY BE NOTED ACROSS MUCH OF THE

SLIGHT RISK REGION.

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Day 3.

DAY 3 CONVECTIVE OUTLOOK

NWS STORM PREDICTION CENTER NORMAN OK

0224 AM CDT TUE JUN 21 2011

VALID 231200Z - 241200Z

...THERE IS A SLGT RISK OF SVR TSTMS ACROSS THE OH VALLEY INTO THE

NRN MIDDLE ATLANTIC REGION...

...UPPER OH VALLEY TO NRN MIDDLE ATLANTIC...

SEVERE THREAT SHOULD LINGER ACROSS THE UPPER OH VALLEY INTO THE NRN

MIDDLE ATLANTIC REGION THURSDAY AS UPPER TROUGH AXIS EASES ACROSS

THE GREAT LAKES-TN VALLEY. THIS UPPER FEATURE WILL MAINTAIN MODEST

SWLY FLOW...ON THE ORDER OF 40KT AT 500MB...FROM THE BASE OF THE

TROUGH OVER TN INTO UPSTATE NY. WHILE IT/S NOT OBVIOUS HOW FOCUSED

LOW LEVEL CONVERGENCE WILL BE ALONG ADVANCING FRONT...IT APPEARS

STRONG BOUNDARY LAYER HEATING ACROSS THE OUTLOOK REGION WILL

ENCOURAGE TSTM DEVELOPMENT BY 18Z WITHIN A FLOW REGIME THAT SHOULD

FAVOR ROTATING UPDRAFTS...OR AT LEAST ORGANIZED MULTI-CELL CLUSTERS

CAPABLE OF PRODUCING DAMAGING WINDS...HAIL AND PERHAPS EVEN ISOLATED

TORNADOES.

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Looks like some light showers if anything today...boring weather day some stratus clouds are covering me right now...that's always nice! Haha

Nothing new here. Showers died out as usual over the Blue Mts. It is so disgusting. For three weeks now, hardly any rain, no severe threats and my yard is turning brown. The mornings consist of crappy stratus covered skies. The sun breaks out, in the early afternoon and looks promising for t-storm development but it falls apart goes to the east of us. It has been a long time since I have seen a weather pattern like this in June. What is really weird is that we are 5-10 degrees hotter than the airport because the sun is out in the afternoon while it has been cloudy and raining at ABE. This has happened many days so far in June. Like yesterday, my thermometer hit 91 degrees and it felt like 91 degrees, My thermometer is usually pretty accurate and is close to ABE reading so my thermometer is not off. I am sure this condition applies to northern Montgomery and eastern Berks counties as well

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I'm sure there will be plenty of thunder given adequate lapse rates, but the NAM and GFS break out way more precip than just discrete storms. The 12z NAM is relatively dry east from a north-south line through Philly, but wet west of that line, whereas the GFS drops >0.50" over everyone west of the Delaware, with some areas farther north getting >1.00"

I'm not really sure I see a huge set-up here given how much activity will be around, although there could be training heavy rain/thunderstorms for some people

I haven't looked much into Thursday yet

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We are gonna get a big bag of nothing this week generally. Everybody already backpedaling off chances. I just want some stinkin' rain is all.

except for that 1-2" of rain with a chance of thunderstorms every day. but other than that yes really nothing at all

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Well today certainly went by the wayside in a hurry after that morning shower passed through so that's one day gone. SPC already backing off on chances tomorrow......

except for that 1-2" of rain with a chance of thunderstorms every day. but other than that yes really nothing at all

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