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Feb 2-3 Tn Valley Severe Storms OBS


jaxjagman

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Figured it's time to start a thread.Euro has been consistent  with a severe threat for several runs.850mb winds in excess of 50+ kts from the S, shouldn't have much problem with any moisture lifting into the Valley.Dynamical system modeled to pull just to our NW.Though there is a tornado threat even if this doesn't transpire i believe we'll see several wind damage reports.With the latest snow and the a weaker system ahead of this one should add fuel to the fire  for some tree damage reports with a saturated ground as the euro has been hinting wind gust in excess of 50kts through out the Valley.

 

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DAY 4-8 CONVECTIVE OUTLOOK 
   NWS STORM PREDICTION CENTER NORMAN OK
   0357 AM CST THU JAN 28 2016

   VALID 311200Z - 051200Z

   ...DISCUSSION...
   THE MEDIUM-RANGE MODELS CONTINUE TO INDICATE THAT A SIGNIFICANT
   SHORT WAVE IMPULSE WILL AMPLIFY CONSIDERABLY AFTER DIGGING INLAND
   ACROSS THE CALIFORNIA COAST DURING THE DAY SUNDAY.  SOME DIFFERENCES
   IN TIMING EXIST BETWEEN THE ECENS AND NCEP MREF CONCERNING THIS
   PROCESS.  HOWEVER...THE 500 MB MEAN HEIGHT FIELD FORECASTS GENERATED
   BY THE TWO MODELS BECOME FAIRLY SIMILAR AS THE IMPULSE TURNS EAST OF
   THE FOUR CORNERS REGION THROUGH THE CENTRAL AND SOUTHERN PLAINS NEXT
   MONDAY THROUGH EARLY TUESDAY.  SPREAD THEN INCREASES ONCE AGAIN
   THEREAFTER...AS IT ACCELERATES ACROSS AND NORTHEAST OF THE
   MISSISSIPPI VALLEY.

   IT STILL APPEARS THAT STRONG CYCLOGENESIS WILL ACCOMPANY THIS
   FEATURE ALONG AN ARCING PATH...FROM THE SOUTH CENTRAL PLAINS INTO
   THE OZARK PLATEAU AND OHIO VALLEY...THROUGH THE ST. LAWRENCE VALLEY
   BY LATE WEEK.  WITHIN THE WARM SECTOR OF THE LOW...A 100 KT JET
   STREAK AT 500 MB IS EXPECTED TO CONTRIBUTE TO STRONG DEEP LAYER
   SHEAR DURING THE EARLY TO MIDDLE PORTION OF NEXT WEEK...COINCIDING
   WITH THE DEVELOPMENT OF A 50-70 KT SOUTHERLY JET AT 850 MB.
   GREATEST SEVERE PROBABILITIES AT THIS TIME APPEAR IN A SWATH ACROSS
   THE LOWER MISSISSIPPI VALLEY TOWARD THE LOWER OHIO VALLEY/CENTRAL
   AND SOUTHERN APPALACHIANS...WHERE A SUBSTANTIVE INFLUX OF MOISTURE
   FROM THE GULF OF MEXICO IS EXPECTED TO CONTRIBUTE TO
   DESTABILIZATION.

   SEVERE STORM PROBABILITIES MAY BEGIN RAMPING UP LATE MONDAY EVENING
   NEAR THE ARKLATEX VICINITY...BEFORE CONTINUING OVERNIGHT ACROSS
   PARTS OF THE OZARK PLATEAU AND LOWER MISSISSIPPI VALLEY.  THE
   EVOLUTION OF A SEVERE SQUALL LINE APPEARS POSSIBLE BY EARLY
   TUESDAY...WHICH IS EXPECTED TO INTENSIFY FURTHER AND RAPIDLY
   PROPAGATE NORTHEASTWARD INTO AND THROUGH PORTIONS OF THE OHIO AND
   TENNESSEE VALLEYS. NEAR OR JUST AHEAD OF THE SOUTHERN FLANK OF THE
   SQUALL LINE...ACROSS PORTIONS OF MISSISSIPPI AND ALABAMA...APPEARS
   THE BEST CHANCE FOR DISCRETE SUPERCELLS.  LARGE HAIL...DAMAGING
   WINDS AND TORNADOES ALL APPEAR POSSIBLE.

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Heck yeah it's time to start a thread! Those wind fields are impressive and should result in some type of strong to severe thunderstorms. Some runs offer a subtle hint of separate southern upper level energy in spite of the surface low ejecting north. Such a scenario would re-energize an existing squall line. Speaking of, the line just gets started late Monday. Perhaps it will not be a rain-out mess on Tuesday morning. Looks like not too much of a Gulf Coast rain blob shown; however, action on the warm front could limit northward expansion. Closer to March I'd feel pretty confident about this set-up. Being the first of February, chance destabilization failing is real. Still this is clearly the most interesting thread!

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Heck yeah it's time to start a thread! Those wind fields are impressive and should result in some type of strong to severe thunderstorms. Some runs offer a subtle hint of separate southern upper level energy in spite of the surface low ejecting north. Such a scenario would re-energize an existing squall line. Speaking of, the line just gets started late Monday. Perhaps it will not be a rain-out mess on Tuesday morning. Looks like not too much of a Gulf Coast rain blob shown; however, action on the warm front could limit northward expansion. Closer to March I'd feel pretty confident about this set-up. Being the first of February, chance destabilization failing is real. Still this is clearly the most interesting thread!

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Love a good storm.Probably banter but i hope the euro gets better

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Give me some thunder in the mountains during winter. Within two weeks, winter returns. I used to laught at that rule until...well, until I actually looked at the results. Hopefully the severe wx isn't too bad.

Edit...My severe wx bill during the past 1.5 yrs is over 20k. Insurance covered most of it, but still had to pay 2k out of pocket.

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ZCZC SPCSWOD48 ALL
   ACUS48 KWNS 290905
   SPC AC 290905

   DAY 4-8 CONVECTIVE OUTLOOK 
   NWS STORM PREDICTION CENTER NORMAN OK
   0305 AM CST FRI JAN 29 2016

   VALID 011200Z - 061200Z

   ...DISCUSSION...
   MODELS ARE IN GOOD AGREEMENT FOR THE D4-D6 PERIOD INDICATING A
   THREAT OF SEVERE WEATHER PERHAPS BEGINNING AS EARLY AS LATE MON
   NIGHT INTO EARLY TUE MORNING ACROSS PORTIONS OF AR...NRN LA AND NERN
   TX...WITH A MORE SUBSTANTIAL THREAT EXPANDING ACROSS THE CNTRL GULF
   COAST STATES NWD TO THE OH VALLEY.

   ON MON/D4...LOW PRESSURE IS FORECAST TO DEEPEN ACROSS THE SRN PLAINS
   AS A STRONG UPPER JET INTENSIFIES ACROSS OK AND TX. LOW LEVEL
   MOISTURE WILL BE RAPIDLY INCREASING AS SLY WINDS STRENGTHEN...BUT
   INSTABILITY IS NOT EXPECTED TO FAVOR SEVERE STORMS UNTIL LATE IN THE
   D4 PERIOD WHEN 60-65 F DEWPOINTS WILL PRECEDE THE COLD FRONT FROM
   ARKANSAS SWD. STORMS SHOULD FORM IN THE 06-12Z TIME FRAME WITH A FEW
   SUPERCELLS OR SMALL BOWS CAPABLE OF DAMAGING WINDS OR BRIEF
   TORNADOES.

   THE SYSTEM WILL CONTINUE TO MATURE WITH AN INCREASING SEVERE THREAT
   TO THE E ON TUE/D5...WITH BOTH MOISTURE AND INSTABILITY INCREASING
   THROUGHOUT THE DAY. THE BEST OVERLAP OF INSTABILITY AND ASCENT WOULD
   APPEAR TO BE FROM CNTRL AND NRN MS INTO NRN AL...WRN AND MIDDLE TN
   DURING THE DAY...OR JUST E OF THE MS RIVER. DESPITE THE WEAK
   INSTABILITY...EXTREME SHEAR PROFILES WILL FAVOR A FEW
   TORNADOES...POSSIBLY ONE OR TWO STRONG...ALONG WITH DAMAGING BOWING
   STRUCTURES.

   SOME SEVERE THREAT IS LIKELY TO PERSIST AFTER 00Z ACROSS AL...THE FL
   PANHANDLE...NWRN GA AND PERHAPS ERN TN/KY...BUT CONDITIONS WILL NOT
   BE OPTIMAL WITH THE LOW CONTINUING TO LIFT NWD...LEAVING THE
   INSTABILITY BEHIND TO THE S.

   ..JEWELL.. 01/29/2016

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d4.png

d5.png

ZCZC SPCSWOD48 ALL

ACUS48 KWNS 290905

SPC AC 290905

DAY 4-8 CONVECTIVE OUTLOOK

NWS STORM PREDICTION CENTER NORMAN OK

0305 AM CST FRI JAN 29 2016

VALID 011200Z - 061200Z

...DISCUSSION...

MODELS ARE IN GOOD AGREEMENT FOR THE D4-D6 PERIOD INDICATING A

THREAT OF SEVERE WEATHER PERHAPS BEGINNING AS EARLY AS LATE MON

NIGHT INTO EARLY TUE MORNING ACROSS PORTIONS OF AR...NRN LA AND NERN

TX...WITH A MORE SUBSTANTIAL THREAT EXPANDING ACROSS THE CNTRL GULF

COAST STATES NWD TO THE OH VALLEY.

ON MON/D4...LOW PRESSURE IS FORECAST TO DEEPEN ACROSS THE SRN PLAINS

AS A STRONG UPPER JET INTENSIFIES ACROSS OK AND TX. LOW LEVEL

MOISTURE WILL BE RAPIDLY INCREASING AS SLY WINDS STRENGTHEN...BUT

INSTABILITY IS NOT EXPECTED TO FAVOR SEVERE STORMS UNTIL LATE IN THE

D4 PERIOD WHEN 60-65 F DEWPOINTS WILL PRECEDE THE COLD FRONT FROM

ARKANSAS SWD. STORMS SHOULD FORM IN THE 06-12Z TIME FRAME WITH A FEW

SUPERCELLS OR SMALL BOWS CAPABLE OF DAMAGING WINDS OR BRIEF

TORNADOES.

THE SYSTEM WILL CONTINUE TO MATURE WITH AN INCREASING SEVERE THREAT

TO THE E ON TUE/D5...WITH BOTH MOISTURE AND INSTABILITY INCREASING

THROUGHOUT THE DAY. THE BEST OVERLAP OF INSTABILITY AND ASCENT WOULD

APPEAR TO BE FROM CNTRL AND NRN MS INTO NRN AL...WRN AND MIDDLE TN

DURING THE DAY...OR JUST E OF THE MS RIVER. DESPITE THE WEAK

INSTABILITY...EXTREME SHEAR PROFILES WILL FAVOR A FEW

TORNADOES...POSSIBLY ONE OR TWO STRONG...ALONG WITH DAMAGING BOWING

STRUCTURES.

SOME SEVERE THREAT IS LIKELY TO PERSIST AFTER 00Z ACROSS AL...THE FL

PANHANDLE...NWRN GA AND PERHAPS ERN TN/KY...BUT CONDITIONS WILL NOT

BE OPTIMAL WITH THE LOW CONTINUING TO LIFT NWD...LEAVING THE

INSTABILITY BEHIND TO THE S.

..JEWELL.. 01/29/2016

Well, at least it looks like East Tennessee's Severe threat appears to be limited to the usual "a few spots see wind damage, but it won't be that bad for most areas".

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This afternoons models show a shift to the S somewhat.The GEM is the furthest S but it gets no support from any other model even the GEPS.Looks like with the further shift S this will go into the eastern part of the Valley over night.The showalter for the east was basically non-existent now it's showing something.So there is convection being shown.

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This afternoons models show a shift to the S somewhat.The GEM is the furthest S but it gets no support from any other model even the GEPS.Looks like with the further shift S this will go into the eastern part of the Valley over night.The showalter for the east was basically non-existent now it's showing something.So there is convection being shown.

In other words, folks in East TN Valley need to keep an eye on this system.

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DAY 4-8 CONVECTIVE OUTLOOK 
   NWS STORM PREDICTION CENTER NORMAN OK
   0226 AM CST SAT JAN 30 2016

   VALID 021200Z - 071200Z

   ...DISCUSSION...
   LATEST MODEL GUIDANCE SUGGESTS A SLOWER PROGRESSION OF THE PRIMARY
   UPPER TROUGH AND SFC FEATURES RESULTING IN A SLIGHT WWD SHIFT IN
   SEVERE PROBABILITIES FOR TUE/D4. IN ADDITION...INSTABILITY LOOKS TO
   BE LESS COMPARED TO EARLIER PROGS WITH WARMER TEMPERATURES ALOFT.
   NONETHELESS...STRONG FORCING FROM THE SFC LOW SWD ALONG THE COLD
   FRONT...AND A LONG DURATION OF STRONG WIND FIELDS SHOULD RESULT IN A
   DAMAGING WIND THREAT WITH A SQUALL LINE...AND PERHAPS A FEW
   TORNADOES FROM NRN MS TO THE LOWER OH RIVER VALLEY ON TUESDAY. AS
   THE SFC LOW MOVES NEWD QUICKLY DURING THE EVENING...A MOIST AIR MASS
   WILL LINGER ACROSS THE CNTRL GULF COAST WITH MORE ISOLATED SEVERE
   STORMS THERE.

   FOR WED/D5...A SUBSTANTIAL ZONE OF SWLY FLOW WILL EXIST ACROSS THE
   SERN TO MID ATLANTIC STATES...BUT FORCING FOR ASCENT WILL BE RATHER
   WEAK EXCEPT FOR WHAT REMAINS OF THE SFC TROUGH. WHILE DEWPOINTS IN
   THE MID 60S F SHOULD EXIST AS FAR N AS NC...WARM TEMPERATURES
   ALOFT/POOR LAPSE RATES WILL LEAD TO WEAK INSTABILITY PROFILES WHICH
   WILL LIMIT THE SEVERE THREAT. A FEW STRONG STORMS ARE LIKELY WITH
   UNIDIRECTIONAL SWLY WIND PROFILES...BUT POTENTIAL IS TOO LOW FOR A
   D5 AREA AT THIS JUNCTURE.

   COOL AND STABLE CONDITIONS WILL PREVAIL BEYOND WED/D5 AS THE FRONT
   CLEARS THE E COAST.

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AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NASHVILLE TN
553 AM CST SAT JAN 30 2016

.DISCUSSION...

WEAK SURFACE WARM FRONT JUST OFF TO OUR SOUTHWEST WILL MOVE
THROUGH THE AREA BEFORE DAYBREAK. WATER VAPOR LOOP SHOWING RATHER
VIGOROUS SHORT WAVE IN EASTERN OKLAHOMA HEADED THIS WAY BUT
MOISTURE IS LACKING SO ONLY EXPECT TO SEE SOME INCREASE IN UPPER
LEVEL CLOUDINESS. SURFACE WINDS WILL PICK UP DURING THE DAY AS
SURFACE PRESSURE GRADIENT TIGHTENS UP ACROSS THE REGION AS SURFACE
LOW DEVELOPS IN SOUTHERN PLAINS. WILL BE CLOSE TO WIND ADVISORY ON
SUNDAY. HIGHS TODAY AND SUNDAY IN THE LOW TO MIDDLE 60S. LOW MOVES
EAST ON SUNDAY WITH ATTENDANT COLD FRONT BRINGING A GOOD CHANCE
FOR RAIN HERE IN THE MID STATE SUNDAY NIGHT. I CANT RULE OUT A
RUMBLE OR TWO OF THUNDER IN MIDDLE TENNESSEE SUNDAY NIGHT AS
VERTICAL VELOCITIES ARE QUITE STRONG NEAR THE FRONT. FRONT WORKS
EAST OF MID STATE EARLY MONDAY SO LOOK FOR COOLER TEMPS DURING THE
DAY MONDAY WITH HIGHS IN THE 50S.

UPPER ZONAL FLOW PATTERN INITIALLY ACROSS THE U.S THIS WEEKEND
WILL BUCKLE OVER WESTERN U.S. AS WE GO INTO THE FIRST PART OF THE
WORK WEEK. ENERGY HITTING THE WESTERN U.S COAST ON SUNDAY WILL
DIG OUT A DEEPENING UPPER TROUGH WITH A 130 KNOT SPEED MAX NOSING
OUT INTO THE SOUTHERN PLAINS DURING THE DAY MONDAY. MODELS HAVE
BEEN CONSISTENT IN DEVELOPING A STRONG AND DYNAMIC SURFACE CYCLONE
ACROSS SOUTHERN NEVADA AND ARIZONA ON SUNDAY THAT MOVES OUT INTO
THE SOUTHERN PLAINS DURING THE DAY MONDAY AND INTO SOUTHEAST
KANSAS BY 12Z TUESDAY. THIS PLACES MID STATE WELL WITHIN WARM
SECTOR DURING THE DAY TUESDAY AND TUESDAY NIGHT. HERE`S THE WAY I
SEE IT FOR NOW. THERE SHOULD BE AN ON-GOING QUASI-LINEAR LINE OF
CONVECTION DOWN THROUGH EASTERN ARKANSAS BY 21Z TUESDAY THAT
MOVES SLOWLY EAST AND ALONG THE TENNESSEE RIVER BY 03Z TUESDAY
EVENING AND THEN ALIGN ALONG INTERSTATE 65 BY MIDNIGHT TUESDAY
NIGHT BEFORE PULLING OFF THE PLATEAU BY 12Z. LOW LEVEL JET INTENSIFIES
DURING THE DAY AND REACHES 60 KNOTS EARLY TUESDAY EVENING WITH
STRONG BULK SHEAR IN THE MID STATE. I CAN SEE BULK SHEAR REACHING
AS MUCH AS 70 KNOTS HERE IN MIDDLE TENNESSEE BETWEEN 00Z TO 06Z
TUESDAY EVENING. GOOD TURNING IN THE HODOGRAPHS AS WELL. IN ADDITION
TO WIND DAMAGE COULD SEE A TWISTER OR TWO HERE IN MIDDLE TENNESSEE
TUESDAY EVENING TO JUST PAST MIDNIGHT.

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NATIONAL WEATHER SERVICE MEMPHIS TN
502 AM CST SAT JAN 30 2016

.DISCUSSION... /ISSUED 431 AM CST SAT JAN 30 2016/

MILD AND BREEZY CONDITIONS WILL PREVAIL OVER THE MIDSOUTH TODAY
AND SUNDAY.

EARLY MORNING GOES WATER VAPOR IMAGERY SHOWED A SHORTWAVE LIFTING
INTO AR...WITH LITTLE TO NO ASSOCIATED CLOUDS PER IR CHANNEL.
UPPER LEVEL ZONAL FLOW WILL PREVAIL FOLLOWING THE SHORTWAVE PASSAGE
LATER TODAY. ANOTHER SHORTWAVE WILL ARRIVE TO THE MIDSOUTH ON
SUNDAY NIGHT...SUFFICIENTLY STRONG TO RESULT IN A WEAK SURFACE
FRONTAL WAVE AND A BUMP IN RAIN CHANCES SUNDAY NIGHT. THE WARM
FRONT WILL RETURN NORTH ON MONDAY...AHEAD OF AN APPROACHING UPPER
LEVEL LOW THAT WILL ARRIVE TO CENTRAL KS BY TUESDAY MORNING.
MONDAY/S TEMPS SHOULD REMAIN MILD...UNDER STRENGTHENING SOUTHWEST
FLOW ALOFT.

TODAY/S 00Z GFS AND ECMWF MODELS TRACK THE AFOREMENTIONED UPPER
LOW FROM CENTRAL KS TO NORTHERN IA TUESDAY...WITH A LEAD SHORTWAVE
EJECTING FROM NORTHERN MO INTO SOUTHERN WI TUESDAY AFTERNOON. TO
THE SOUTH...NEUTRAL TO SLIGHT POSITIVELY ORIENTED HEIGHT FALLS
WILL OCCUR OVER THE LOWER AND MIDDLE MS RIVER VALLEY ON TUESDAY.
OVER THE MIDSOUTH...00Z GFS DEPICTED A NARROW CORRIDOR OF SFC-1KM
MUCAPE AT OR BELOW 600 J/KG ALONG THE MS RIVER AT NOON TUESDAY.
THE MODEST INSTABILITY APPEARS REASONABLE GIVEN THE EXPECTED CLOUD
COVER AND SCATTERED PRE FRONTAL SHOWERS. CONCURRENTLY... GFS PROGS
925MB WINDS NEAR 55KT ALONG THE MS RIVER MIDDAY TUESDAY...THOUGH
THESE WINDS ARE DEPICTED ROUGHLY PARALLEL TO AND SLIGHTLY AHEAD OF
THE CONVECTIVE LINE.

GIVEN THE HEIGHT FALLS AND RELATIVELY STRONG WIND FIELDS...A
ISOLATED DAMAGING WIND THREAT WILL EXIST WHERE BOWING SEGMENTS
ARE ABLE TO PERSIST. IN ADDITION...THE RELATIVELY SHOW EASTWARD
MOVEMENT OF THE CONVECTIVE LINE WILL LIKELY RESULT IN LOCALLY
HEAVE RAINFALL.

FOLLOWING THE COLD FRONTAL PASSAGE AND EXIT OF RAINFALL TUESDAY
EVENING...DRY AND COOL WEATHER WILL PREVAIL THROUGH THE REMAINDER
OF THE WEEK. OUTER PERIODS OF GFS AND ECMWF HINT AT DEEPER HEIGHT
FALLS OVER THE EASTERN TWO-THIRDS OF THE U.S...SUGGESTIVE OF
COLDER THAN NORMAL TEMPS FOR THE EARLY TO MIDDLE PART OF FEBRUARY.

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