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Severe Weather Threat May 7th - 13th


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Not to take away from the severe going on right now in the Northern Plains, but...

786

FXUS64 KOUN 100210

AFDOUN

AREA FORECAST DISCUSSION

NATIONAL WEATHER SERVICE NORMAN OK

910 PM CDT MON MAY 9 2011

CORRECTED W/W/A INFO AT THE END...

UPDATE

RED FLAG WARNING FOR THIS EVENING WAS CANCELED EARLIER AS THE

DRYLINE RETREATED INTO THE PANHANDLES. WE WILL NOW UPGRADE TUESDAY'S

FIRE WEATHER WATCH TO ANOTHER RED FLAG WARNING. IN ORDER TO AVOID

CONFUSION WE WOULD RATHER NOT HAVE TWO RED FLAG WARNINGS GOING

SIMULTANEOUSLY.

WE ALSO WILL REMOVE THE ISOLATED EVENING THUNDERSTORMS. ONE STORM

FINALLY GOT GOING IN SW TX NEAR THE DRYLINE THIS EVENING. CHANCES OF

FURTHER INITIATION TONIGHT ARE NON-ZERO BUT ARE CONSIDERED TOO LOW

TO JUSTIFY KEEPING THEM IN THE FORECAST.

ONLY OTHER CHANGE AT THIS POINT IS TO RE-WORK SOME OF THE HOURLY T

AND TD GRIDS THIS EVENING TO BETTER FIT CURRENT TRENDS.

WEDNESDAY LOOKS LIKE TROUBLE. 'NUFF SAID.

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I like it. Let's see some Dryline Magic.

The low level winds are looking a bit anemic, though...I'd like to see them a bit stronger.

Forecast sounding at RQO only showing 14 knots of 0-1 shear. Hopefully the low level winds are being under forecast.

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In my view, not much has changed since last night in model land. There are still several concerns in getting an environment conducive for tornadoes along the dryline, including the veer-back-veer issue as well as relatively modest low-level shear profiles (as huronicane just mentioned). However, I don't really disagree with the SWODY2, as the hail and wind threat is still likely to be widespread and justifies the 45% area.

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In my view, not much has changed since last night in model land. There are still several concerns in getting an environment conducive for tornadoes along the dryline, including the veer-back-veer issue as well as relatively modest low-level shear profiles (as huronicane just mentioned). However, I don't really disagree with the SWODY2, as the hail and wind threat is still likely to be widespread and justifies the 45% area.

The trend of the low being delayed is becoming a concern for even the MDT hail/wind.

Other than that, agreed... not sold on a significant DL tornado threat at all.

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Mr. Izzi

AS THIS ZONE OF WARM AIR ADVECTION AND STRONGER ASCENT SHIFT

NORTHEAST OUT OF THE AREA EARLY THIS MORNING EXPECT THE ENORMOUS AND

VERY IMPRESSIVE EML TO SPREAD OVER THE AREA AND EFFECTIVELY CAP US

OFF BIG TIME. BEGINNING TO THINK THAT 2011 WILL BE KNOWN AS THE YEAR

OF THE EML WITH AN EXPANSIVE AREA UPSTREAM SOUNDINGS LAST EVENING

SHOWING A VERY LARGE AREA WITH NEARLY DRY ADIABATIC MID LEVEL LAPSE

RATES. THERE DOES APPEAR TO BE A WEAK DISTURBANCE OVER N TX AND S OK

WHICH IS PROGGED TO RIDE THE SUBTROPICAL JET TOWARD IL THIS

AFTERNOON THOUGH IT IS VERY QUESTIONABLE WHETHER ASCENT WITH THIS

FEATURE WILL BE ENOUGH TO LIFT THROUGH THE MASSIVE CAP IN PLACE. IF

IT DOES WOULD APPEAR THAT THE BEST CONVECTIVE THREAT THIS AFTERNOON

WOULD BE OVER OUR SOUTHERN COUNTIES WHERE I THREW IN SLIGHT CHANCE

POPS THIS AFTERNOON

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Mr. Izzi

AS THIS ZONE OF WARM AIR ADVECTION AND STRONGER ASCENT SHIFT

NORTHEAST OUT OF THE AREA EARLY THIS MORNING EXPECT THE ENORMOUS AND

VERY IMPRESSIVE EML TO SPREAD OVER THE AREA AND EFFECTIVELY CAP US

OFF BIG TIME. BEGINNING TO THINK THAT 2011 WILL BE KNOWN AS THE YEAR

OF THE EML WITH AN EXPANSIVE AREA UPSTREAM SOUNDINGS LAST EVENING

SHOWING A VERY LARGE AREA WITH NEARLY DRY ADIABATIC MID LEVEL LAPSE

RATES. THERE DOES APPEAR TO BE A WEAK DISTURBANCE OVER N TX AND S OK

WHICH IS PROGGED TO RIDE THE SUBTROPICAL JET TOWARD IL THIS

AFTERNOON THOUGH IT IS VERY QUESTIONABLE WHETHER ASCENT WITH THIS

FEATURE WILL BE ENOUGH TO LIFT THROUGH THE MASSIVE CAP IN PLACE. IF

IT DOES WOULD APPEAR THAT THE BEST CONVECTIVE THREAT THIS AFTERNOON

WOULD BE OVER OUR SOUTHERN COUNTIES WHERE I THREW IN SLIGHT CHANCE

POPS THIS AFTERNOON

:axe:

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Ya it blows, already some serious instability for 9am.

writing today off. the NAM does ride a nocturnal complex SE into our area by early morning, these things are notoriously fickle and hard to model, but it's something to watch and it would be nice to have a boundary in the area for the pulse storm tomorrow afternoon.

EDIT: just looked at the instability numbers, those 5-6k projections won't be far off. With a little luch we'll see whatever fires up over Minny dive southeast into the area around daybreak.

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RUC has a dot of 8000 SBCAPE near Galena later.

Would be a shame to waste this instability. Can probably count on one hand the number of days this year that will be like this. Still some hope for something firing later in vicinity of the front but it may be to my east.

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