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April 12th/13th and 15-16th Severe Weather Thread


andyhb

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I'm not chasing (never have, want to some day), but besides chaser convergence, am I the only one sniffing initiation in Oklahoma near dusk/fading light, and thinking Kansas to Iowa would be better place to be Saturday afternoon?

if ks/ok goes right it will be big it seems but if i were out i'd be very tempted to play in the north. models have continued to be pretty consistent on it and plenty of analogs produced well on the northern zone. plus ok is going to be a zoo lol.

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The new 1730 Day 2 outlook is a joke.

http://www.spc.noaa....lk_1730_any.gif

Looking at the SREFs Craven Brooks and SigTors on the SPC site, I'd have a hard time coming up with a major quibble with the degreed mets and severe specialists at SPC. 15% in the hatched area might be a tad low, but I'd trust their judgement over mine. But that is just me, just a rank amateur hobbyist.

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This system extends well W of the Plains. As we saw yesterday, some impressive dynamics at play even in CA...

MESOSCALE DISCUSSION 0497

NWS STORM PREDICTION CENTER NORMAN OK

0111 PM CDT THU APR 12 2012

AREAS AFFECTED...COASTAL RANGES INTO THE SACRAMENTO VALLEY

CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE

VALID 121811Z - 121915Z

A THREAT OF ISOLATED TORNADOES AND MARGINALLY SEVERE HAIL WILL

INCREASE THIS AFTERNOON. AREA IS BEING MONITORED FOR A POSSIBLE WW.

18Z WV IMAGERY REFLECTS AN AREA OF IMPLIED FORCING FOR ASCENT

APPROACHING THE NRN CA COAST. ISOLATED LIGHTNING STRIKES HAVE BEEN

OBSERVED...ASSOCIATED WITH INCREASING CONVECTIVE DEVELOPMENT AHEAD

OF THE UPPER FEATURE. THESE STORMS HAVE BEEN SHOWING WEAK LOW-MID

LEVEL ROTATION PER EUREKA RADAR...IN PART DUE TO STEEPENING LOW-MID

LEVEL LAPSE RATES AND STRENGTHENING DEEP LAYER WINDS WITH THE WRN

TROUGH. ALTHOUGH THESE STORMS MAY PRODUCE MARGINALLY SEVERE HAIL AS

THEY IMPACT THE COAST...A TEMPORARY WEAKENING MAY BE NOTED AS THE

STORMS TRAVERSE INTO A DRIER AND RELATIVELY MORE STABLE AIR MASS.

HOWEVER...VERY LITTLE CLOUD COVER AND COOLING TEMPERATURES ALOFT

WILL CONTRIBUTE TO WEAK INSTABILITY THIS AFTERNOON. THUNDERSTORMS

ARE EXPECTED TO INITIATE/INCREASE IN COVERAGE OVER THE SACRAMENTO

VALLEY WHERE TERRAIN INFLUENCES WILL SUPPORT SURFACE CONVERGENCE FOR

CUMULUS DEVELOPMENT. FAVORABLE MID/UPPER JET DYNAMICS WITH AN

APPROACHING SPEED MAX WILL FURTHER SUPPORT VERTICAL

DEVELOPMENT...WITH ROTATING STORMS BECOMING INCREASINGLY POSSIBLE

LATER THIS AFTERNOON. HOWEVER...ONLY MODEST MOISTURE CHARACTERIZED

BY DEW POINTS LARGELY IN THE MID 40S AND PWAT VALUES NEAR 0.50 INCH

MAY POTENTIALLY LIMIT A MORE WIDESPREAD SEVERE THREAT. CONVECTIVE

TRENDS WILL CONTINUE TO BE MONITORED.

..HURLBUT.. 04/12/2012

ATTN...WFO...HNX...STO...MTR...EKA...

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I'm not chasing (never have, want to some day), but besides chaser convergence, am I the only one sniffing initiation in Oklahoma near dusk/fading light, and thinking Kansas to Iowa would be better place to be Saturday afternoon?

I like to chase but the sheer number of chasers that will be on this event along with the storms showing to fire around 00Z is making me double think going out this weekend. I do this for fun and to be honest it dosent sound too fun right now.

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Looks like a squall line is starting up near Sterling Colorado. I'm not sure if this is going to be a large severe storm. It could continue up to Nebraska with a few wind reports. I wish I could drive out to that 2000 CAPE bullseye near Sterling. Only 100 miles. Probably wouldn't be able to prove much if I did drive there.

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Tornado probs are 70/20 in the watch, interesting. 80/60 for hail.

i bet the next one to the south/se will have stronger sig tor odds. i'd be tempted to gamble on the e tx panhandle into sw ok.

on a side note; how often does ok have overnight tornado events? seems somewhat unusual.. a threat sat night.

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i bet the next one to the south/se will have stronger sig tor odds. i'd be tempted to gamble on the e tx panhandle into sw ok.

on a side note; how often does ok have overnight tornado events? seems somewhat unusual.. a threat sat night.

Doesn't seem too likely.

mcd0499.gif

MESOSCALE DISCUSSION 0499

NWS STORM PREDICTION CENTER NORMAN OK

0228 PM CDT THU APR 12 2012

AREAS AFFECTED...SWRN KS THROUGH THE ERN OK AND TX PANHANDLES

CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE

VALID 121928Z - 122130Z

SWRN KS THROUGH THE ERN TX AND OK PANHANDLES ARE BEING MONITORED FOR

THUNDERSTORM INITIATION. OVERALL THREAT IS CONDITIONAL GIVEN

UNCERTAINTY REGARDING INITIATION. SHOULD STORMS DEVELOP COVERAGE

SHOULD REMAIN SPARSE...BUT DISCRETE SUPERCELLS CAPABLE OF VERY LARGE

HAIL AND A WINDOW FOR ISOLATED TORNADOES WILL BE THE MAIN THREATS

INTO THE EARLY EVENING.

THE BOUNDARY LAYER IS MIXING OUT WITH A DECREASE IN STRATOCUMULUS

FROM THE WEST ACROSS SWRN KS THROUGH THE OK AND TX PANHANDLES TO THE

EAST OF A DRYLINE THAT EXTENDS FROM ERN CO SWD THROUGH WRN TX.

HOWEVER...THE BOUNDARY LAYER REMAINS CAPPED BY AN EML THAT HAS

ADVECTED THROUGH THE WARM SECTOR BENEATH AXIS OF UPPER 50S

DEWPOINTS...CONTRIBUTING TO 1500-2000 J/KG MLCAPE. THE DEEPER

FORCING ATTENDING SHORTWAVE TROUGH CURRENTLY EJECTING NEWD THROUGH

CO WILL REMAIN NORTH OF THIS REGION. HOWEVER...CONTINUED DIABATIC

WARMING AND DRYLINE CONVERGENCE MIGHT BE SUFFICIENT TO INITIATE AT

LEAST AN ISOLATED STORM OR TWO LATER THIS AFTERNOON OR EARLY

EVENING. SHOULD STORMS DEVELOP...EFFECTIVE BULK SHEAR OF 40-50 KT

WILL SUPPORT SUPERCELLS. THE 0-1 KM HODOGRAPH SIZE WILL ALSO

INCREASE AS THE LLJ STRENGTHENS TOWARD EVENING SUPPORTING A WINDOW

FOR ISOLATED TORNADOES BEFORE THE BOUNDARY LAYER DECOUPLES.

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i bet the next one to the south/se will have stronger sig tor odds. i'd be tempted to gamble on the e tx panhandle into sw ok.

on a side note; how often does ok have overnight tornado events? seems somewhat unusual.. a threat sat night.

I think the last real big nighttime event was May 9th 2003, I keep comparing that 2 day event with this one, as OKC got hit 2 days in a row.

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i bet the next one to the south/se will have stronger sig tor odds. i'd be tempted to gamble on the e tx panhandle into sw ok.

on a side note; how often does ok have overnight tornado events? seems somewhat unusual.. a threat sat night.

Thank you!! That's what I have been saying all along! I lived my whole life in Oklahoma, and I don't remember having a significant overnight tornado threat. The only I can remember was the 1984 overnight event that hit Morris and Mannford, cities outside of Tulsa. This could be quite scary!

Most huge tornadoes for Oklahoma comes in the afternoon, early evening.

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