| Gewijzigd: 27 januari 2017, 13:37 uur, door Joyce.s
TORNADO WATCH NUMBER 48
NWS STORM PREDICTION CENTER NORMAN OK
635 AM CDT SUN MAR 8 2009
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
WEST CENTRAL ILLINOIS
FAR SOUTHEAST KANSAS
SOUTHWEST THROUGH EAST CENTRAL MISSOURI
EFFECTIVE THIS SUNDAY MORNING AND AFTERNOON FROM 635 AM UNTIL 200
PM CDT.
TORNADOES...HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 65 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 55 MILES NORTH NORTHWEST OF
JOPLIN MISSOURI TO 25 MILES NORTH OF ALTON ILLINOIS. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU8).
REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS.
DISCUSSION...TSTMS/POSSIBLE SUPERCELLS EXPECTED TO INCREASE DURING
THE NEXT SEVERAL HOURS OVER WW AREA AS HEIGHT FALLS/DEEP ASCENT
SHARPLY INCREASE ATOP WARM SECTOR OF DEVELOPING MO SFC LOW.
STRENGTH OF LOW LVL SHEAR /50 KT/ AND EXISTING QUASI-DISCRETE STORM
STRUCTURES SUGGEST POTENTIAL FOR ISOLD TORNADOES IN ADDITION TO
BOWING SEGMENTS WITH HIGH WIND/HAIL.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
400. MEAN STORM MOTION VECTOR 24045.
TORNADO WARNING
NATIONAL WEATHER SERVICE SPRINGFIELD MO
721 AM CDT SUN MAR 8 2009
THE NATIONAL WEATHER SERVICE IN SPRINGFIELD HAS ISSUED A
* TORNADO WARNING FOR...
NORTHWESTERN CEDAR COUNTY IN SOUTHWEST MISSOURI...
ST. CLAIR COUNTY IN WEST CENTRAL MISSOURI...
RADAR : http://radar.weather.gov/radar.php?rid=eax...111&loop=no | Gewijzigd: 8 maart 2009, 13:27 uur, door Stormchazer
SPC AC 081258
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0758 AM CDT SUN MAR 08 2009
VALID 081300Z - 091200Z
...THERE IS A MDT RISK OF SVR TSTMS OVER PARTS OF ERN MO...IL...AND
IND...
...THERE IS A SLGT RISK OF SVR TSTMS FROM THE OZARKS INTO THE MID MS
AND LWR OH VLYS...
...SYNOPSIS...
A COMPLEX SERIES OF SPEED MAXIMA WILL FURTHER AMPLIFY TROUGH NOW
DIGGING INTO THE WRN U.S. FROM WRN CANADA...WHILE RIDGE PERSISTS
FROM THE GULF OF MEX INTO THE WRN ATLANTIC. THIS PATTERN WILL
ACCELERATE POTENT KS SHORTWAVE IMPULSE ENE INTO IL TODAY...AND INTO
MI/IND TONIGHT...BEFORE THE SYSTEM TURNS MORE E OR ESE INTO NY/PA
EARLY MON.
AT THE SFC...LOW NOW OVER N CNTRL MO SHOULD REACH SRN LK MI BY EARLY
EVE...AND UPSTATE NY BY 12Z MONDAY...AS TRAILING COLD FRONT SETTLES
SE INTO THE TN...LWR MS...AND RED RVR VLYS. WRN PART OF BOUNDARY
EXPECTED TO RE-FORM NWD ACROSS OK AND KS LATE IN THE PERIOD AS
AMPLIFYING WRN U.S. TROUGH INDUCES LEE CYCLOGENESIS IN CO.
...MID MS INTO LWR OH VLYS...
LEADING EDGE OF DPVA/STRONG ASCENT ASSOCIATED WITH KS UPR IMPULSE
HAS OVERTAKEN WRN EDGE OF SFC WARM SECTOR IN THE PAST HOUR. THIS
LIKELY HAS SUPPORTED RECENT INCREASE IN STRENGTH OF STORMS ALONG
COLD FRONT NOW ENTERING W CNTRL MO.
AREA VWP/PROFILER DATA SHOW VERY STRONG WIND FIELD ACCOMPANYING THE
KS VORT...WITH MID LVL WSW FLOW NEAR 100 KTS...AND 40-50 KT 0-1 KM
SHEAR ASSOCIATED WITH 60 KT SWLY LLJ. PERSISTENCE OF LLJ HAS
ALLOWED FOR A MODEST INCREASE IN LOW LVL MOISTURE ACROSS THE OZARKS
INTO THE MID MS AND LWR OH VLYS RELATIVE TO YESTERDAY... WITH STLT
PW DATA AVERAGING AROUND 1.25 INCHES. ALTHOUGH RAOBS SHOW
CONTINUING PRESENCE OF SUBSTANTIAL CIN...500-1000 J/KG MUCAPE
APPEARS TO BE AVAILABLE IN WARM SECTOR GIVEN FORCED UPLIFT.
CLOUDS WILL HINDER WARM SECTOR HEATING/DESTABILIZATION...AND MID LVL
COOLING WILL BE LIMITED AS IMPULSE CONTINUES ENEWD. BUT COMBINED
STRENGTH OF FORCING AND WIND FIELD...COUPLED WITH EVEN MODEST
HEATING...SUGGESTS THAT EXISTING CONVECTIVE BAND LIKELY WILL
CONTINUE TO POSE A RISK FOR SVR WIND...HAIL...AND ISOLD TORNADOES
EWD INTO PARTS OF THE MID MS AND LWR OH VLYS THROUGH EARLY EVE.
AHEAD OF THE MAIN AXIS OF ASCENT...SUSTAINED WARM ADVECTION AND
INCREASING UPR DIVERGENCE MAY SUPPORT ADDITIONAL SMALLER
CLUSTERS/SHORT BANDS OF STORMS ALONG AND N OF WARM/STNRY FROM NRN IL
INTO NRN IND/OH. DESPITE BEING SLIGHTLY ELEVATED...THESE MAY POSE A
MORE ISOLD RISK OF SVR. | Gewijzigd: 27 januari 2017, 13:38 uur, door Joyce.s
http://www.kmov.com/video/weather-index.ht...10&live=yes
http://www.fox2now.com/news/livestreaming/
http://radar.weather.gov/radar.php?rid=lsx...111&loop=no
http://www.newslink.org/motele.html
http://tornadovideos.net/full-screen-chaser-video.php | Gewijzigd: 8 maart 2009, 16:48 uur, door Stormchazer
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1036 AM CDT SUN MAR 8 2009
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
NORTHEASTERN FRANKLIN COUNTY IN EAST CENTRAL MISSOURI
ST. CHARLES COUNTY IN EAST CENTRAL MISSOURI
NORTHERN ST. LOUIS COUNTY IN EAST CENTRAL MISSOURI
NORTHWESTERN ST. LOUIS CITY IN EAST CENTRAL MISSOURI | Gewijzigd: 8 maart 2009, 16:42 uur, door Stormchazer
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1125 AM CDT MON MAR 09 2009
VALID 091630Z - 101200Z
...THERE IS A SLGT RISK OF SVR TSTMS FROM PARTS OF TX INTO THE MID
MS VALLEY...
...OK/KS THIS MORNING THROUGH EARLY AFTERNOON...
A BROAD UPPER TROUGH CONTINUES TO DIG ACROSS THE WESTERN STATES
TODAY...WHILE A SERIES OF SHORTWAVE TROUGHS TRACK FROM THE DESERT
SOUTHWEST INTO THE CENTRAL/SOUTHERN PLAINS. ONE FEATURE IS NOW
EJECTING NORTHEASTWARD ACROSS EASTERN CO/WESTERN KS...AND APPEARS TO
BE HELPING TO MAINTAIN A SMALL CLUSTER OF THUNDERSTORMS OVER WESTERN
OK. THESE STORMS ARE APPROACHING THE WESTERN EDGE OF RAPIDLY
RETURNING GULF MOISTURE. POTENTIAL EXISTS FOR INTENSIFICATION BY
EARLY AFTERNOON AS STORMS MOVE ACROSS NORTHERN OK AND SOUTHERN KS.
PLEASE REFER TO LATEST SWOMCD FOR FURTHER DETAILS.
...OK/KS INTO MID MS VALLEY THIS AFTERNOON THROUGH TONIGHT...
BY MID-LATE AFTERNOON...A RELATIVELY MOIST AND MODERATELY UNSTABLE
AIRMASS WILL BE IN PLACE OVER MUCH OF CENTRAL/EASTERN OK AND
PORTIONS OF SOUTHEAST KS. SURFACE DEWPOINTS ARE CURRENTLY CLIMBING
THROUGH THE 50S IN THIS REGION AND VISIBLE SATELLITE SUGGESTS SOME
BROKEN SUNSHINE IS LIKELY THIS AFTERNOON. MEANWHILE...70-80 KT MID
LEVEL WINDS AND ANOTHER WEAK SHORTWAVE TROUGH MOVING ACROSS NM IS
EXPECTED TO APPROACH THE REGION HELPING TO INITIATE NEW
THUNDERSTORMS. PRESENT INDICATIONS ARE THAT STORMS WILL INTENSIFY
OVER WEST-CENTRAL OK AND SOUTHERN KS DURING THE 20-23Z PERIOD AND
TRACK EAST-NORTHEASTWARD THROUGH THE EVENING. MODEL FORECAST
SOUNDINGS INDICATE FAVORABLE LOW LEVEL AND DEEP LAYER VERTICAL SHEAR
FOR SUPERCELLS THROUGHOUT THIS AREA. INCREASING LOW LEVEL MOISTURE
/LOW LCL VALUES AND CONTINUED DESTABILIZATION/ WILL ENHANCE THE RISK
OF TORNADOES IN MORE PERSISTENT CELLS THIS EVENING ROUGHLY ALONG AN
AXIS FROM OKC - TUL - SGF. HAIL AND DAMAGING WINDS WILL ALSO BE
POSSIBLE WITH THESE STORMS. ACTIVITY MAY SPREAD AS FAR EASTWARD AS
SOUTH-CENTRAL IL BY TUE MORNING WITH A CONTINUED RISK OF LOCALLY
SEVERE STORMS.
..HART/SMITH.. 03/09/2009
Update: voor zover ik nu kan zien is gisteren een behoorlijke bust geworden. Ah wel, die horen er ook bij. | Gewijzigd: 10 maart 2009, 08:42 uur, door KnightDoppler
Update: voor zover ik nu kan zien is gisteren een behoorlijke bust geworden. Ah wel, die horen er ook bij.
er waren wel prachtige live beelden te zien van tvn onder andere van david drummond die bijna live een tornado touchdown filmde:
en brian die achter een fikse supercell aanzat:
Daarna zal er echter een periode volgen waarin zuid westelijke winden de kans krijgen om vocht vanuit de Golf van Mexico de plains op te sturen voordat er maandag een koufront over trekt. Genoeg om een 'Severe Threat' uittegeven in de Day 4-8 outlook:
"THERMODYNAMIC
ENVIRONMENT SHOULD BE SUFFICIENT -- GIVEN ANTICIPATED STRENGTH OF
FLOW ALOFT -- TO SUPPORT THE POTENTIAL FOR A WIDESPREAD SEVERE
WEATHER EPISODE"
Eens kijken hoe dat gaat ontwikkelen. Daarna is er te veel verschillen tussen de modellen om nu threats uittegeven.
Voor Nederland: GFS laat dinsdag koude bovenlucht over Nederland trekken waardoor er dan wat negatieve Lifted Indices te zien zijn. Ook dat maar even volgen... [Edit: in de laatste run is dit alweer verdwenen] | Gewijzigd: 18 maart 2009, 13:06 uur, door KnightDoppler
"WHILE SOMEWHAT MERIDIONAL -- PARTICULARLY OVER THE CENTRAL
PLAINS...WIND FIELD WILL BE PLENTY STRONG TO SUPPORT
SEVERE/SUPERCELL STORMS -- AND THUS ATTM IT CONTINUES TO APPEAR THAT
A FAIRLY WIDESPREAD SEVERE EVENT IS LIKELY."
In mindere mate dinsdag ook nog, daarna blijft het te onduidelijk.
"WHILE SOMEWHAT MERIDIONAL -- PARTICULARLY OVER THE CENTRAL
PLAINS...WIND FIELD WILL BE PLENTY STRONG TO SUPPORT
SEVERE/SUPERCELL STORMS -- AND THUS ATTM IT CONTINUES TO APPEAR THAT
A FAIRLY WIDESPREAD SEVERE EVENT IS LIKELY."
In mindere mate dinsdag ook nog, daarna blijft het te onduidelijk.
The GFS model runs from this morning are painting an interesting picture across the Plains for this upcoming Monday. A strong, negatively tilted upper level trough ejects out into the central US on Monday with an associated deepening surface low forecasted to be at 989mb by 0z that evening.
Other interesting aspects of this setup include a very strong (50kts+!) lower level jet developing that evening and a well defined dryline extending from the surface low in NW Kansas down through Texas. A possible limiting factor to the setup is lack of moisture, typical for an early Spring setup in March. The GFS is showing 55+ dewpoints up to northern Kansas however, and if the system slows down any, moisture return could be more significant. Very strong dynamics could also make up for the less than stellar moisture when assessing the tornado potential.
The Storm Prediction Center has outlined an area for Day 6 including most of Oklahoma, Kansas, and Nebraska, and mentions the possibility for a widespread severe weather outbreak.
bron: D. Holder TVN | Gewijzigd: 19 maart 2009, 17:33 uur, door Stormchazer
Vrijdag en Zaterdag: flinke gebieden met general thunderstorms
Zondag: veel onduidelijkheden, maar er is potentie, voorlopig nog geen threat maar een 'See-Text' gebied
Maandag: Lijkt de beste dag te worden, severe threat blijft in stand:
"THE PRESENCE OF STEEP LAPSE
RATES...STRONG DYNAMIC FORCING AND STRENGTHENING WIND FIELDS WILL
LIKELY FOSTER NUMEROUS SEVERE STORMS /INCLUDING SUPERCELLS/ ALONG OR
AHEAD OF DRYLINE OR PACIFIC FRONT OVER THE CNTRL AND SRN PLAIN"
Dinsdag: Maakt ook duidelijk kans, severe threat is toegevoegd:
"GIVEN THE INCREASING MOISTURE/INSTABILITY AND CONTINUED
STRONG WIND FIELDS...POTENTIAL WILL EXIST FOR ANOTHER ORGANIZED
SEVERE WEATHER EPISODE FROM ERN PARTS OF OK/TX INTO PORTIONS OF AR
AND PERHAPS SRN MO AND NRN LA"
Daarna: kans op zwaar onweer blijft bestaan, maar te veel onzekerheden om concrete uitspraken te doen.
Bron: SPC
NL: GFS komt al dagen met een gebied met negatieve LI's en wat Cape. Het gebied schommelt qua tijd (maandag, dinsdag, woensdag) en lokatie (Nederland, Duitsland).
Nu lijkt woensdagmiddag het beste, alhoewel je van <300 J/Kg cape en LI's net onder de -1 ook niet te veel hoeft te verwachten. Even iets verder kijken: dauwpunten liggen in het maximale gebied juist iets lager dan er omheen, T-Max van 9 graden komt qua vorm wel aardig overeen, maar vooral het minimum van de T500 heeft dezelfde vorm als het maximum van de onstabiliteit. Wind aan de grond laat convergentie zien over West DLD.
Lijkt mij een geval Maartse buien met korrelhagel, wie weet wat natte sneeuw en een verdwaalde klap onweer.
NL: GFS komt al dagen met een gebied met negatieve LI's en wat Cape. Het gebied schommelt qua tijd (maandag, dinsdag, woensdag) en lokatie (Nederland, Duitsland).
Nu lijkt woensdagmiddag het beste, alhoewel je van <300 J/Kg cape en LI's net onder de -1 ook niet te veel hoeft te verwachten. Even iets verder kijken: dauwpunten liggen in het maximale gebied juist iets lager dan er omheen, T-Max van 9 graden komt qua vorm wel aardig overeen, maar vooral het minimum van de T500 heeft dezelfde vorm als het maximum van de onstabiliteit. Wind aan de grond laat convergentie zien over West DLD.
Lijkt mij een geval Maartse buien met korrelhagel, wie weet wat natte sneeuw en een verdwaalde klap onweer.
NL: de shear is voor maandag wel extreem. Ook moet er maandag/nacht rekening gehouden worden met een hoge stormvloed aan de nederlands kust!
bij Polen misschien zelfs tornado's | Gewijzigd: 27 januari 2017, 13:39 uur, door Joyce.s
Strong CAA will be underway during the evening and night hours. Very cold mid-levels/steep lapse rates overspread those regions, but LL moisture content is quite low, although GFS indicates some recovery during the late night hours. Few thunderstorms are possible with strong wind gusts/marginal hail. Right now not much activity is forecast, so we want to wait for futher model runs, before introducing a general thunderstorm area.
updates binnenkort op estofex
bron :estofex | Gewijzigd: 22 maart 2009, 18:20 uur, door Stormchazer