Tornado live blog 2 en 3 maart

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Gestart door Jan van Ooijen, vr 24 feb 2012 - 23:01

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Vortex

De day 1 outlook houdt het bij een moderate risk, zonder de kans op een upgrade naar High Risk te noemen.

Het gebied is wel groter geworden en alle individuele kansen zijn hoog:

Tornado's: 15% + Significant = Moderate
Wind: 45% + Significant = Moderate
Hagel: 45% + Significant = Moderate

Voor zowel tornado's als wind geldt dat bij een stapje hoger qua percentage er sprake is van een High Risk.

Ik verwacht dat binnenkort de MP4 met de briefing van SPC online komt.
We'll ride the spiral to the end and may just go where no one's been. Spiral out, keep going...
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Tricker

 A VERY STRONG JET CORE AT MID-HIGH LEVELS WILL INTENSIFY IN EXCESS
   OF 110KT AS IT OVERSPREADS SRN MO INTO THE OH VALLEY LATER TODAY.
   IN RESPONSE TO THIS FEATURE A SFC LOW OVER NCNTRL OK EARLY THIS
   MORNING WILL TRACK NEWD AND DEEPEN OVER MO INTO CNTRL IL BY MID DAY.
    BOUNDARY LAYER MOISTURE IS RECOVERING RAPIDLY ACROSS ERN OK ATTM
   WITH 60F DEW POINTS NOW SPREADING NORTH OF I-40.  THIS MOISTURE
   SURGE WILL ADVECT INTO MO BY SUNRISE AND STRONG WARM ADVECTION IS
   EXPECTED TO INDUCE MULTIPLE CLUSTERS OF ELEVATED SEVERE
   THUNDERSTORMS...CAPABLE OF PRODUCING LARGE HAIL...AHEAD OF SFC LOW
   ALONG/NORTH OF RETREATING WARM FRONT.  SUBSEQUENT EXPANSION NEWD
   WITH RECOVERING AIRMASS WILL ALLOW SEVERE WARM ADVECTION STORMS TO
   SPREAD ACROSS MUCH OF THE OH VALLEY BY 18Z.  WHILE LARGE HAIL WILL
   LIKELY BE THE PREDOMINANT THREAT EARLY...A FEW TORNADOES ARE
   POSSIBLE AS AIRMASS MOISTENS.  IN THE WAKE OF THIS ACTIVITY BOUNDARY
   LAYER DEW POINTS WILL RISE INTO THE LOWER 60S AHEAD OF SFC COLD
   FRONT AND LOW LEVEL LAPSE RATES SHOULD STEEPEN SUCH THAT PRE-FRONTAL
   SUPERCELL DEVELOPMENT WILL LIKELY EVOLVE NEAR OR SHORTLY AFTER 18Z
   ACROSS IL.  FORECAST SOUNDINGS ACROSS THE WARM SECTOR OVER SRN IL
   SUGGEST MUCAPE SHOULD BE ON THE ORDER OF 2000 J/KG WITHIN AN
   OTHERWISE VERY STRONGLY SHEARED ENVIRONMENT.  THIS PRE-FRONTAL
   CONVECTION SHOULD THEN EXPAND IN AREAL COVERAGE DOWNSTREAM ACROSS
   IND/KY BEFORE DEVELOPING SWWD ALONG THE WIND SHIFT ACROSS TN INTO
   NRN AL/MS.
   
   AFTER THE INITIAL WARM ADVECTION CONVECTION ACROSS THE MID MS/OH
   VALLEY REGION...THE PRIMARY FOCUS WILL BE WITH ACTIVITY THAT EVOLVES
   AFTER 18Z AHEAD OF COLD FRONT.  WITH QUITE STEEP LAPSE RATES IN
   PLACE...ENVIRONMENTAL CONDITIONS FAVOR LARGE HAIL IN ADDITION TO
   POSSIBLY STRONG TORNADOES WITH ANY DISCRETE SUPERCELLS THAT FORM
   ACROSS THE MOIST WARM SECTOR.  WITH TIME A DAMAGING SQUALL LINE
   COULD EMERGE WITH VERY STRONG WINDS.

Het zal een mooie dag zijn voor de chasers! Maar niet voor omstanders.. Hopen dat het buiten de steden blijft! naar mijn mening zijn er nu al te veel doden gevallen(dinsdag en woensdag 12 personen)

TheWalker

Vandaag is het dan zo ver, een dag om je adem in te houden voor een groot gebied van Amerika.


Vortex

SPC heeft net aangekondigd dat de eerste Severe Thunderstorm Watch er aan zit te komen, dit is voor het Slight Risk gebied (de Slight Risk outlook van 'gisteren' is nog tot 13.00 bij ons geldig')

A SEVERE THREAT IS EXPECTED TO DEVELOP ACROSS FAR SE KS AND SRN MO
OVER THE NEXT HOUR AS CELLS INITIATE. LARGE HAIL AND ISOLATED WIND
DAMAGE WILL BE POSSIBLE AS STORMS INCREASE IN COVERAGE. WW ISSUANCE
WILL LIKELY BE NEEDED ACROSS THE REGION.

KS = Kansas, MO = Missouri
We'll ride the spiral to the end and may just go where no one's been. Spiral out, keep going...
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Jan van Ooijen

Mmmmm ik zie Tuscaloosa er weer eens tussen staan, hopen dat daar alles meevalt
Enjoy the weather, it's the only weather you've got!

Vortex

De watch is er, ongeveer voor de driehoek Joplin, Kansas City, St. Louis:

http://www.spc.noaa.gov/products/watch/ww0054.html

Buien zijn er ook al, maar nog geen warnings. (EDIT: Inmiddels wel eerste Severe Storm Warning, vooral flinke hagel mogelijk)

Echte zware buien worden pas vanaf 18/19 uur bij ons verwacht, maar toch maar eens kijken wat dit gaat doen.

Ah lekker... vandaag vrij :)
We'll ride the spiral to the end and may just go where no one's been. Spiral out, keep going...
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Tricker

Er zijn al inderdaad een paar goeie buien zich aan het ontwikkelen!!! Pff kan nog wel eens zoals vorig jaar 22 mei?

EDIT
Citaat van: Vortex op vr 02 mrt 2012 - 09:17
Ah lekker... vandaag vrij :)

Geluks poepert;) Volg ook wel gewoon via streams en GRLevel op het werk(tussendoor continue) :P

EDIT
Is dit trouwens een inflow op doppler of is het gewoon ruis/crap(laatste plaatje)?

Vortex

Zou een Hail Spike kunnen zijn. Heb de details zo even niet meer paraat, maar was iets met Three Body Scattering waardoor een radar signaal door hagel als het ware vertraagd wordt. Door de vertraging denkt de radar dat de echo verder weg zit dan hij in werkelijkheid zit en daardoor krijg je van die uitsteeksels.

http://en.wikipedia.org/wiki/Hail_spike
We'll ride the spiral to the end and may just go where no one's been. Spiral out, keep going...
http

jeffrey83

Hmmm, 6 uur klaar met werken! Ga er dan maar eens goed voor zitten!

Vortex

HIGH RISK zo juist uitgegeven, voor wind en hagel Moderate Risk, voor Tornado's High Risk.

Zwaartepunt ligt boven Kentucky.

Xenia (welke tornado liefhebber kent het niet? ;)) ligt in het Moderate Risk gebied. http://en.wikipedia.org/wiki/Super_Outbreak
We'll ride the spiral to the end and may just go where no one's been. Spiral out, keep going...
http


Jan van Ooijen

TOR:CON index



0 - near-zero chance of a tornado or severe thunderstorm nearby
2 - very low chance of a tornado nearby, but hail or strong wind gusts possible
4 - low chance of a tornado nearby, but hail and/or strong wind gusts possible
6 - moderate possibility of a tornado in the area of concern
8 - high probability of a tornado in the area of concern
Enjoy the weather, it's the only weather you've got!

TheWalker

The Storm Prediction Center has just upgraded the KY and TN areas to High Risk for large and damaging tornadoes today. The High Risk designation indicates a probability of tornadoes within 25 miles of any location within the high risk zone. The hatched area indicates a 10% or greater probability of a large EF2-EF5 tornado developing within 25 miles of any given point within that area. The major ...cities impacted within the hatched area are Louisville KY, Bowling Green KY and Nashville TN. People in those areas should take special precautions today and stay tuned to local weather coverage. If your area is put under a Tornado Warning today, please take it seriously and get to your shelter or safe room as quickly as possible...preferably underground. If you don't have underground shelter available and know someone that does, I recommend that you get there rather than try to shelter above ground. Please be safe everyone!!



yeris

@Jan van Ooijen er is een update van de TORCON uitgekomen met KY central - 9


T-inus

Begint spannend te worden, we zitten met zijn 2en op het werk de zaak mooi in de gaten te houden haha
Some men see things as they are and say : "why?" - I dream things that never were and say : "why not

Tricker

Een van de grote jongens, die wel eens heel vervelende grote tornado's kan laten vallen... Hij blijft maar groeien en heviger worden

Jur

Bier staat al koud, daar gaan we vanavond eens goed voor zitten.

Vortex

We'll ride the spiral to the end and may just go where no one's been. Spiral out, keep going...
http

TheWalker



The Storm Prediction Center has upgraded a portion of their enhanced moderate risk to an extremely significant, rare HIGH RISK. These high risks are only issued one or two times a year and mean there is a very high confidence that there is the potential for very significant, deadly, severe weather. Don?t think just because you?re not in the high risk that you?re not in danger. The significant risk of severe weather extends all the way south into Mississippi and Alabama, northward into the Ohio Valley. Surrounding that significant risk, we have the standard ?slight? risk of severe weather. That extends all the way west towards Arkansas/Louisiana, northeastward into the Great Lakes. Severe weather coverage will be higher in the moderate/high risk zones, but severe weather is possible in the standard risk zones as well.



Here?s a zoomed in shot of the high risk zone, just to give a little more detail on the specific major cities at risk. As you can see, Nashville and Louisville are just some of the cities in this rare, extremely dangerous HIGH RISK.



Here?s a little bit more specific information. This graphic shows the probability of experiencing a tornado within 25 miles of your location today. The red line is where the high risk zone has been issued, and means there is nearly a 1 in 3 chance of a tornado occurring within 25 miles of downtown Nashville and Louisville. Obviously the 15% risk (orange line) is also very significant. Today still appears ready to be a major tornado outbreak. It?s going to be very busy and we?ll do our best to keep you informed.


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