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April 14th, 2012 Plains High Risk


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Pretty much agree with the SPC's placement of highest tornado probs...if anything I probably would have clipped the southern end a bit given the high resolution models' lack of breaking out any cells in central OK. Spatial coverage certainly won't be an issue further north given the multiple rounds of initiation. I do think the worst of the tornadic activity will wait until after 21z, when the low level jet gets cranked up, although we still could see at least several significant tornadoes before then. There's nothing that suggests to me at this time that this will fall short of a large, high-impact tornado outbreak for at least NE and KS.

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1st warning of the day up:

BULLETIN - EAS ACTIVATION REQUESTED

TORNADO WARNING

NATIONAL WEATHER SERVICE HASTINGS NE

1209 PM CDT SAT APR 14 2012

THE NATIONAL WEATHER SERVICE IN HASTINGS HAS ISSUED A

* TORNADO WARNING FOR...

WESTERN JEWELL COUNTY IN NORTH CENTRAL KANSAS...

NORTHWESTERN MITCHELL COUNTY IN NORTH CENTRAL KANSAS...

NORTHEASTERN OSBORNE COUNTY IN NORTH CENTRAL KANSAS...

SOUTHEASTERN SMITH COUNTY IN NORTH CENTRAL KANSAS...

* UNTIL 1245 PM CDT

* AT 1204 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A

SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS

STORM WAS LOCATED 5 MILES SOUTH OF OSBORNE...OR 30 MILES WEST OF

BELOIT...AND MOVING NORTHEAST AT 45 MPH.

* LOCATIONS IMPACTED INCLUDE...

DOWNS...CAWKER CITY...IONIA...ESBON...BURR OAK AND MANKATO.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS TORNADO WARNING REPLACES THE SEVERE THUNDERSTORM WARNING THAT

WAS IN EFFECT FOR THE SAME AREA.

&&

LAT...LON 3999 9840 3977 9813 3928 9855 3938 9879

TIME...MOT...LOC 1709Z 209DEG 37KT 3942 9863

HAIL <.75IN

$$

HEINLEIN

wont post anymore wordings, just thought we'd kick this off with the 1st one.

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Pretty much agree with the SPC's placement of highest tornado probs...if anything I probably would have clipped the southern end a bit given the high resolution models' lack of breaking out any cells in central OK. Spatial coverage certainly won't be an issue further north given the multiple rounds of initiation. I do think the worst of the tornadic activity will wait until after 21z, when the low level jet gets cranked up, although we still could see at least several significant tornadoes before then. There's nothing that suggests to me at this time that this will fall short of a large, high-impact tornado outbreak for at least NE and KS.

Agreed. We saw a similar evolution of events on 5 May 2007, with early, non-tornadic intitiation that eventually evolved into an outbreak of 93 tornadoes. The difference today is three-fold. 1) Better instability/shear combo. 2) Main threat shifted a bit east into more populated areas. 3) Better support for nighttime tornadoes.

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WICHITA WSR-88D RADAR DATA INDICATE CONVECTION DEVELOPING OVER ERN

KINGMAN COUNTY AND SURROUNDING AREAS IN ASSOCIATION WITH A LOBE OF

ASCENT TRANSLATING NEWD FROM NRN OK PER WATER VAPOR IMAGERY. WITH

DEEPENING BOUNDARY-LAYER CIRCULATIONS AMIDST STRENGTHENING

INSTABILITY AND WEAKENING CINH /SBCINH ALREADY LESS NEGATIVE THAN

-10 J PER KG ACCORDING TO MODIFIED RUC SOUNDINGS/...CONVECTION MAY

RAPIDLY DEEPEN AND BECOME TORNADIC GIVEN THE STRONG LOW-LEVEL AND

DEEP-LAYER SHEAR. AS SUCH...THE PARTICULARLY DANGEROUS SITUATION

TORNADO WATCH 165 MAY NEED TO BE EXPANDED EWD INTO MORE OF SERN KS

AND POSSIBLY NERN OK IF THIS THREAT CONTINUES TO INCREASE.

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WICHITA WSR-88D RADAR DATA INDICATE CONVECTION DEVELOPING OVER ERN

KINGMAN COUNTY AND SURROUNDING AREAS IN ASSOCIATION WITH A LOBE OF

ASCENT TRANSLATING NEWD FROM NRN OK PER WATER VAPOR IMAGERY. WITH

DEEPENING BOUNDARY-LAYER CIRCULATIONS AMIDST STRENGTHENING

INSTABILITY AND WEAKENING CINH /SBCINH ALREADY LESS NEGATIVE THAN

-10 J PER KG ACCORDING TO MODIFIED RUC SOUNDINGS/...CONVECTION MAY

RAPIDLY DEEPEN AND BECOME TORNADIC GIVEN THE STRONG LOW-LEVEL AND

DEEP-LAYER SHEAR. AS SUCH...THE PARTICULARLY DANGEROUS SITUATION

TORNADO WATCH 165 MAY NEED TO BE EXPANDED EWD INTO MORE OF SERN KS

AND POSSIBLY NERN OK IF THIS THREAT CONTINUES TO INCREASE.

Just saw that on the RUC, also the visible satellite image posted that shows increasing cloud development west of the sunshine here in Joplin:

RUC_255_2012041416_F03_CREF_SURFACE.png

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