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Severe Weather - New Years Eve 2010


David Reimer

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warning popping fast in LA

BULLETIN - EAS ACTIVATION REQUESTED

TORNADO WARNING

NATIONAL WEATHER SERVICE LAKE CHARLES LA

151 PM CST FRI DEC 31 2010

THE NATIONAL WEATHER SERVICE IN LAKE CHARLES HAS ISSUED A

* TORNADO WARNING FOR...

NORTH CENTRAL RAPIDES PARISH IN CENTRAL LOUISIANA...

THIS INCLUDES...ALEXANDRIA INTERNATIONAL AIRPORT...BOYCE...

* UNTIL 215 PM CST

* AT 149 PM CST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A

SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR GARDNER...

MOVING NORTHEAST AT 35 MPH.

* THE TORNADO WILL BE NEAR...

ALEXANDRIA INTERNATIONAL AIRPORT BY 200 PM CST...

TIMBER TRAILS AND TIOGA BY 210 PM CST...

BALL BY 215 PM CST...

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still only 5% probs from SPC..I'm rather preplexed

DAY 1 CONVECTIVE OUTLOOK

NWS STORM PREDICTION CENTER NORMAN OK

0157 PM CST FRI DEC 31 2010

VALID 312000Z - 011200Z

...THERE IS A SLGT RISK OF SVR TSTMS FROM PARTS OF THE LOWER OH/TN

VALLEYS TO LOWER MS VALLEY AND CENTRAL GULF COAST STATES...

..LOWER MS VALLEY/CENTRAL GULF COAST TO MID MS VALLEY/MIDWEST

EVOLUTION OF LARGE SCALE FEATURES/FORCING REMAINS ON TRACK AS

THE 20Z OUTLOOK MAINTAINS A SLIGHT RISK WITH WRN PORTIONS OF THE

RISK /WRN AR TO WRN IL/ REMOVED DUE TO FRONTAL PASSAGE AND DECIDEDLY

WLY COMPONENT OF LOW-MIDLEVEL WINDS ADVECTING COOLER BOUNDARY LAYER

CONDITIONS/GREATER STABILITY INTO THE POST-FRONTAL ENVIRONMENT.

MEANWHILE...AREAS EXTENDING FROM SRN AL TO THE LOWER OH VALLEY HAVE

BEEN ADDED TO THE SLIGHT RISK. THIS INCLUSION IS FOR ALL SEVERE

WEATHER TYPES AS PRE-FRONTAL AIR MASS UNDERGOES DESTABILIZATION

UNTIL EARLY-MID EVENING OVER LOWER OH VALLEY AND INTO THE OVERNIGHT

WITH SRN EXTENT. THIS COMBINED WITH STRONG EFFECTIVE BULK SHEAR AND

LOW LEVEL SRH...ESPECIALLY ACROSS THE LOWER MS VALLEY WHERE

INSTABILITY IS GREATER...WILL SUPPORT AN ATTENDANT THREAT FOR

TORNADOES AND DAMAGING WINDS/HAIL.

..PETERS.. 12/31/2010

PREV DISCUSSION

/ISSUED 1022 AM CST FRI DEC 31 2010/

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still only 5% probs from SPC..I'm rather preplexed

DAY 1 CONVECTIVE OUTLOOK

NWS STORM PREDICTION CENTER NORMAN OK

0157 PM CST FRI DEC 31 2010

VALID 312000Z - 011200Z

...THERE IS A SLGT RISK OF SVR TSTMS FROM PARTS OF THE LOWER OH/TN

VALLEYS TO LOWER MS VALLEY AND CENTRAL GULF COAST STATES...

..LOWER MS VALLEY/CENTRAL GULF COAST TO MID MS VALLEY/MIDWEST

EVOLUTION OF LARGE SCALE FEATURES/FORCING REMAINS ON TRACK AS

THE 20Z OUTLOOK MAINTAINS A SLIGHT RISK WITH WRN PORTIONS OF THE

RISK /WRN AR TO WRN IL/ REMOVED DUE TO FRONTAL PASSAGE AND DECIDEDLY

WLY COMPONENT OF LOW-MIDLEVEL WINDS ADVECTING COOLER BOUNDARY LAYER

CONDITIONS/GREATER STABILITY INTO THE POST-FRONTAL ENVIRONMENT.

MEANWHILE...AREAS EXTENDING FROM SRN AL TO THE LOWER OH VALLEY HAVE

BEEN ADDED TO THE SLIGHT RISK. THIS INCLUSION IS FOR ALL SEVERE

WEATHER TYPES AS PRE-FRONTAL AIR MASS UNDERGOES DESTABILIZATION

UNTIL EARLY-MID EVENING OVER LOWER OH VALLEY AND INTO THE OVERNIGHT

WITH SRN EXTENT. THIS COMBINED WITH STRONG EFFECTIVE BULK SHEAR AND

LOW LEVEL SRH...ESPECIALLY ACROSS THE LOWER MS VALLEY WHERE

INSTABILITY IS GREATER...WILL SUPPORT AN ATTENDANT THREAT FOR

TORNADOES AND DAMAGING WINDS/HAIL.

..PETERS.. 12/31/2010

PREV DISCUSSION

/ISSUED 1022 AM CST FRI DEC 31 2010/

There must be some reason behind it. It seems almost like January 7, 2008 but I think during the last run they put up a 10% hatched area for strong tornadoes and put up a PDS tornado watch.

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I guess im not very observant, but someone pointed it out to me on FB. The last 2 photos i posted are NOT from today. Look at the leaves on the tree...Sad people would send that in.

Yeah definite fake there, meaning when the image was taken not the image itself.

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That's the unfortunate thing, these things struck so quick, and were pretty powerful. Last I heard there was 5 fatalities :(

I guess we just missed this.

No one was prepared or alarmed for this kind of event.

I have never seen them blare the sirens for so long.

when they first did it, all of us on a local met board were basically laughing at it. After a while I guess they had the right idea with how bad these storms got.

by the time they got to me...we had sirens for 45 min. You could tell by then with every single radio and local news breaking in that is was a big deal.

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Jackson, MS is going to be in trouble from this supercell all by its lonesome, heading right for the city.

BULLETIN - EAS ACTIVATION REQUESTED

TORNADO WARNING

NATIONAL WEATHER SERVICE JACKSON MS

323 PM CST FRI DEC 31 2010

THE NATIONAL WEATHER SERVICE IN JACKSON HAS ISSUED A

* TORNADO WARNING FOR...

NORTHWESTERN LINCOLN COUNTY IN SOUTH CENTRAL MISSISSIPPI...

NORTH CENTRAL FRANKLIN COUNTY IN SOUTHWEST MISSISSIPPI...

SOUTHEASTERN JEFFERSON COUNTY IN SOUTHWEST MISSISSIPPI...

* UNTIL 400 PM CST

* AT 323 PM CST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A

SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR KIRBY

MOVING NORTHEAST AT 45 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO UNION

CHURCH...BLUE HILL...MCBRIDE AND CASEYVILLE

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Jackson, MS is going to be in trouble from this supercell all by its lonesome, heading right for the city.

BULLETIN - EAS ACTIVATION REQUESTED

TORNADO WARNING

NATIONAL WEATHER SERVICE JACKSON MS

323 PM CST FRI DEC 31 2010

THE NATIONAL WEATHER SERVICE IN JACKSON HAS ISSUED A

* TORNADO WARNING FOR...

NORTHWESTERN LINCOLN COUNTY IN SOUTH CENTRAL MISSISSIPPI...

NORTH CENTRAL FRANKLIN COUNTY IN SOUTHWEST MISSISSIPPI...

SOUTHEASTERN JEFFERSON COUNTY IN SOUTHWEST MISSISSIPPI...

* UNTIL 400 PM CST

* AT 323 PM CST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A

SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR KIRBY

MOVING NORTHEAST AT 45 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO UNION

CHURCH...BLUE HILL...MCBRIDE AND CASEYVILLE

That thing is getting nasty in a hurry.

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AREA FORECAST DISCUSSION

NATIONAL WEATHER SERVICE JACKSON MS

345 PM CST FRI DEC 31 2010

..SEVERE WEATHER EVENT ONGOING THIS AFTERNOON AND INTO TONIGHT

DISCUSSION

TONIGHT THROUGH SATURDAY NIGHT...

THE RISK FOR SIGNIFICANT SEVERE WEATHER IS RAMPING UP ACROSS THE

ARKLAMISS REGION. OVERALL...NWP GUIDANCE HAS BEEN UNDERCUTTING THE

DEGREE OF DESTABILIZATION FOR TODAY...BASED ON COMPARISON TO LATEST

OBSERVATIONS AND RUC ANALYSIS OUTPUT. THE SPECIAL 31/18Z KJAN RAOB

SOUNDING ALREADY SHOWS MUCH OF THE CAPPING INVERSION FROM THIS

MORNING HAVING BEEN ERODED IN RESPONSE TO COOLING IN THE 800-700-MB

LAYER AND SOME SURFACE HEATING. AROUND 600 J/KG OF SBCAPE WAS NOTED

IN THIS SOUNDING...WITH AROUND 30 J/KG OF CONVECTIVE INHIBITION. THIS

IS SHOWN IN THE LATEST RUC MESO-ANALYSIS...WHICH INDICATES A BROAD

ZONE OF POSITIVE BUOYANCY EXTENDING FROM EAST TEXAS ACROSS LOUISIANA

AND SOUTHEAST ARKANSAS AND FURTHER EAST TOWARD THE I-55 CORRIDOR. IN

THIS REGION...LITTLE CONVECTIVE INHIBITION IS NOTED...WITH SBCAPE

VALUES RANGING FROM 1000-2000 J/KG ACROSS SOUTHWEST MISSISSIPPI...SOUTHEAST

ARKANSAS...AND NORTHEAST LOUISIANA. THIS BUOYANCY IS BEING SUPPORTED

BY UNSEASONABLY MOIST SURFACE DEWPOINTS ALREADY IN THE MIDDLE 60S

ACROSS THE SOUTHWESTERN HALF OF THE CWA...WITH READINGS INTO THE

LOWER 70S ACROSS SOUTHEAST LOUISIANA. THE NAM APPEARS TO BEST

INITIALIZE THIS MODERATE DEGREE OF INSTABILITY...AND IS ALSO THE MOST

UNSTABLE MODEL.

AS FOR THE KINEMATICS...STRONG SOUTHWESTERLY MID-LEVEL FLOW ATOP OF

THE MOISTURE/INSTABILITY WEDGE BUILDING OVER THE LOWER MISSISSIPPI

VALLEY REGION IS CHARACTERIZED BY H5 SPEEDS OF 50-60 KT. THIS IS

SUPPORTING EFFECTIVE BULK SHEAR MAGNITUDES OF 50-60 KT IN THIS

REGION...WHERE THE SIGNIFICANT SEVERE PARAMETER RANGES FROM 20-30

AND THE SUPERCELL COMPOSITE PARAMETER RANGES FROM 6-12...WITH THE

HIGHEST VALUES ACROSS THE FAR SOUTHWEST. THESE PARAMETERS CONTINUE

TO SUPPORT A MULTI-MODAL CONVECTION OVER NORTHEAST LOUISIANA...WHERE

CONVECTION HAS EXHIBITED BOTH SUPERCELLULAR AND MULTICELLULAR

CHARACTERISTICS. THE LACK OF CONVECTIVE INHIBITION HAS MOSTLY KEPT

THE CONVECTION FROM REMAINING DISCRETE...THOUGH INDIVIDUAL UPDRAFTS

APPEAR TO BE SPATIALLY SEPARATED SUFFICIENTLY FOR LITTLE

OBSTRUCTION TO MOIST/UNSTABLE INFLOW. THUS...CONVECTION HAS MADE

SEVERAL ATTEMPTS AT DEEPER ROTATION. UPON COORDINATION WITH THE

STORM PREDICTION CENTER...TORNADO WATCH NUMBER 772 HAS BEEN

EXPANDED NORTHWARD ALONG THE MISSISSIPPI RIVER AND NORTHEASTWARD

INTO THE JACKSON METRO AREA BASED ON THE SPATIAL EXPANSION OF THE

GREATER INSTABILITY AND PERSISTENTLY STRONG LOW-LEVEL WIND SHEAR.

HOWEVER...AS WE HEAD LATER INTO THE LATE AFTERNOON AND

EVENING...DEEP-LAYER Q-VECTOR CONVERGENCE WILL INCREASE FROM WEST TO

EAST AHEAD OF A LARGE AND POWERFUL STORM SYSTEM OVER THE

MID-SECTION OF THE CONUS. MEANWHILE...A SURFACE COLD FRONT EXTENDS

FROM CENTRAL ARKANSAS ACROSS NORTHWEST LOUISIANA INTO SOUTHEAST

TEXAS...AND IS FORECAST TO PROGRESS EASTWARD THIS AFTERNOON AND REACH

THE NORTHWEST CWA AROUND 6 PM. AS THE FRONT MOVES ACROSS THE

REGION...IT WILL DECELERATE AS IT APPROACHES DEEP-LAYER RIDGING

ENTRENCHED ACROSS THE SOUTHEAST CONUS. AHEAD OF THE FRONT...CONTINUED

MOISTURE ADVECTION AND DESTABILIZATION WILL MAINTAIN A ZONE OF

MODERATE INSTABILITY...WHERE STRONG DEEP-LAYER SHEAR WILL PERSIST.

0-1 KM STORM-RELATIVE HELICITY VALUES THROUGH TONIGHT ARE EXPECTED TO

RANGE FROM 150-300 M2/S2...WHICH WILL SUPPORT STRONG LOW-LEVEL

ROTATION WITH ANY PREFRONTAL DISCRETE CONVECTION OR ANY QUASI-LINEAR

CONVECTIVE SYSTEM THAT EVOLVES NEAR THE COLD FRONT. AS

SUCH...TORNADOES...SOME STRONG...WILL REMAIN A DEFINITE CONCERN

THROUGH THE OVERNIGHT...ALONG WITH DAMAGING STRAIGHT-LINE WINDS OF

60-80 MPH AND HAIL TO THE SIZE OF QUARTERS. LOCAL HIGH-RES WRF

GUIDANCE SUGGESTS THE POTENTIAL FOR SUPERCELLS...BOWING LINE

SEGMENTS...AND MULTICELLULAR CONVECTION ALL THROUGH THE NIGHT...WITH

THE ATTENDANT RISK FOR SEVERE WEATHER.

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