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April 14th, 2012 Plains High Risk


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mcd0530.gif

VALID 142001Z - 142030Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 165 CONTINUES.

DRYLINE CIRCULATIONS ADJACENT TO A N-S-ORIENTED ZONE OF SFC

CONFLUENCE CONTINUE TO FOSTER THE DEVELOPMENT OF DISCRETE SUPERCELLS

FROM CNTRL/SWRN KS INTO WRN OK. DURING THE NEXT HALF HOUR TO

HOUR...THE HIGHEST THREAT FOR TORNADOES ALONG WITH VERY LARGE HAIL

WILL EXTEND FROM CNTRL/SWRN KS INTO NWRN OK WITH NEWD/ENEWD-TRACKING

SUPERCELLS CURRENTLY IN HODGEMAN/PAWNEE COUNTIES KS...KIOWA COUNTY

KS...HARPER COUNTY OK...AND AN INCIPIENT CONVECTIVE PLUME IN ELLIS

COUNTY. VISIBLE SATELLITE IMAGERY SUGGESTS ADDITIONAL CUMULUS

DEVELOPING NEAR THE DRYLINE TOWARD THE RED RIVER...AND THE

PARTICULARLY DANGEROUS SITUATION TORNADO WATCH 165 HAD EARLIER BEEN

EXTENDED SWD TO THE TX/OK BORDER. WITH DEEP-LAYER SHEAR VECTORS

EXHIBITING A SUBSTANTIAL DRYLINE-ORTHOGONAL COMPONENT AND EFFECTIVE

SRH VALUES OF AROUND 300-500 M2/S2...DISCRETE SUPERCELLS CAPABLE OF

PRODUCING TORNADOES...SOME POSSIBLY STRONG TO VIOLENT...ALONG WITH

VERY LARGE HAIL AND DMGG STRAIGHT-LINE WINDS WILL BE OF CONCERN.

..COHEN.. 04/14/2012

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Not sure what, but something still must be missing because these cells are just not able to maintain strong circulations for very long...at least yet. They seem to intensify for a few scans...and then dissipate...and another goes. More than just the typical cycle as the overall mid-level mesos having the same issue. This will probably not last...but I think for the moment its keeping these from becoming real strong...long-tracked threats.

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Rotation increasing on the Buffalo cell, TW issued.

BULLETIN - EAS ACTIVATION REQUESTED

TORNADO WARNING

NATIONAL WEATHER SERVICE NORMAN OK

318 PM CDT SAT APR 14 2012

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* TORNADO WARNING FOR...

NORTHEASTERN HARPER COUNTY IN NORTHWESTERN OKLAHOMA...

EXTREME NORTHWESTERN WOODS COUNTY IN NORTHWESTERN OKLAHOMA...

* UNTIL 345 PM CDT

* AT 316 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED

A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS

DANGEROUS STORM WAS LOCATED 7 MILES NORTH OF SELMAN...MOVING

NORTHEAST AT 40 MPH.

* THIS TORNADIC THUNDERSTORM WILL REMAIN OVER MAINLY RURAL AREAS

OF NORTHEASTERN HARPER AND EXTREME NORTHWESTERN WOODS

COUNTIES.

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Not sure what, but something still must be missing because these cells are just not able to maintain strong circulations for very long...at least yet. They seem to intensify for a few scans...and then dissipate...and another goes. More than just the typical cycle as the overall mid-level mesos having the same issue. This will probably not last...but I think for the moment its keeping these from becoming real strong...long-tracked threats.

I'm not sure either, but it might be because the main upper level support is still back in the four corners region. I'd venture to guess in a few hours things will change. Maybe someone with more experience than me would have a better idea.

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I'm not sure either, but it might be because the main upper level support is still back in the four corners region. I'd venture to guess in a few hours things will change. Maybe someone with more experience than me would have a better idea.

Yeah I was expecting scarier, more persistent cells.

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Not sure what, but something still must be missing because these cells are just not able to maintain strong circulations for very long...at least yet. They seem to intensify for a few scans...and then dissipate...and another goes. More than just the typical cycle as the overall mid-level mesos having the same issue. This will probably not last...but I think for the moment its keeping these from becoming real strong...long-tracked threats.

This was anticipated. Things won't really get going until another hour or two, and once that happens it'll jump quickly. The missing ingredient is the crazy helicities that come with the strengthening low level jet. I've seen this happen in previous outbreaks, with some of the extremists calling the event a bust, when all of a sudden the couplets tighten up all at once.

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This was anticipated. Things won't really get going until another hour or two, and once that happens it'll jump quickly. The missing ingredient is the crazy helicities that come with the strengthening low level jet. I've seen this happen in previous outbreaks, with some of the extremists calling the event a bust, when all of a sudden the couplets tighten up all at once.

I'd tend to agree...just seems the SRH while not gigantic is already there for the most part based on mesoanalysis as well as 17z/18z soundings. Just thought the circulations would seem to be stronger/more persistent than they have so far based on that. CAPE/Shear is very balanced overall.

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I fear this situation will only get worse as tornadotony referenced in an earlier post. The lengthy string of pearls will only move eastward into areas with higher dews and thus richer low level moisture as the low level jet ramps up and the trough ejects out with greater upper air support as progged for this evening into the overnight hours. We have been relatively fortunate so far that the storms have been in less populated rangeland areas but that is about to change.

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I'd tend to agree...just seems the SRH while not gigantic is already there for the most part based on mesoanalysis as well as 17z/18z soundings. Just thought the circulations would seem to be stronger/more persistent than they have so far based on that. CAPE/Shear is very balanced overall.

Yeah the SRH is already pretty high, but things are pretty much going as I expected. I'm not sure why, but the jump from "pretty high SRH" to "crazy SRH" makes a huge difference in terms of significant tornado production, at least from my subjective experience with outbreaks. It's like a switch comes on at some point.

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