Buckeye05 Posted April 4, 2012 Share Posted April 4, 2012 Lot of squall and boundary action right now. Could this make for a more "interesting" situation tomorrow? Link to comment Share on other sites More sharing options...
Met1985 Posted April 4, 2012 Share Posted April 4, 2012 All i can say is WOW what a day. Hate to hear of all the homes destroyed and hopefully no deaths but wow what a day it has been for weather. My neck of the wood saw one of the worst storms in a long time today then this just unreal. Hope everyone is safe out there. Link to comment Share on other sites More sharing options...
yoda Posted April 4, 2012 Share Posted April 4, 2012 BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE NEW ORLEANS LA 1154 PM CDT TUE APR 3 2012 THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A * TORNADO WARNING FOR... WEST CENTRAL ORLEANS PARISH IN SOUTHEAST LOUISIANA... THIS INCLUDES THE CITY OF NEW ORLEANS... * UNTIL 1230 AM CDT * AT 1153 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO OVER NEW ORLEANS. THIS TORNADO WAS NEARLY STATIONARY. Link to comment Share on other sites More sharing options...
on_wx Posted April 4, 2012 Share Posted April 4, 2012 BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE NEW ORLEANS LA 1154 PM CDT TUE APR 3 2012 THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A * TORNADO WARNING FOR... WEST CENTRAL ORLEANS PARISH IN SOUTHEAST LOUISIANA... THIS INCLUDES THE CITY OF NEW ORLEANS... * UNTIL 1230 AM CDT * AT 1153 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO OVER NEW ORLEANS. THIS TORNADO WAS NEARLY STATIONARY. Link to comment Share on other sites More sharing options...
yoda Posted April 4, 2012 Share Posted April 4, 2012 Tornado still nearly stationary in SWS... how exactly does that happen? EDIT: Warning cancelled Link to comment Share on other sites More sharing options...
Boogieman Posted April 4, 2012 Share Posted April 4, 2012 Tornado still nearly stationary in SWS... how exactly does that happen? EDIT: Warning cancelled That's about the craziest thing I've ever heard! Stationary? I couldn't speculate on that even if I knew what I was talking about. Link to comment Share on other sites More sharing options...
on_wx Posted April 4, 2012 Share Posted April 4, 2012 PRELIMINARY LOCAL STORM REPORT NATIONAL WEATHER SERVICE NEW ORLEANS LA 1230 AM CDT WED APR 04 2012 .TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON .DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE. ..REMARKS.. 1158 PM TSTM WND DMG 3 NE NEW ORLEANS 30.00N 90.05W 04/03/2012 ORLEANS LA BROADCAST MEDIA ROOF BLOWN OFF OF HOUSE AT GENTILLY AND FRANKLIN AVENUES. SEVERAL HOMES DAMAGED. POSSIBLE TORNADO. Link to comment Share on other sites More sharing options...
radarman Posted April 4, 2012 Share Posted April 4, 2012 Remarkable there are no reports of deaths so far. Link to comment Share on other sites More sharing options...
Quixotic1 Posted April 4, 2012 Share Posted April 4, 2012 Remarkable there are no reports of deaths so far. Time of day must have played a factor. Everybody I know was in an inside hallway or stairwell at work or school. Link to comment Share on other sites More sharing options...
radarman Posted April 4, 2012 Share Posted April 4, 2012 The Tarrant county storm had broad, well defined circulation, however as you can see in the table the gate-to-gate shear at the lowest level maxed out at about 70 kts. The max inbound velocity in the entire circulation was about 43 kts and max outbound, 64 kts. Link to comment Share on other sites More sharing options...
radarman Posted April 4, 2012 Share Posted April 4, 2012 The Lancaster circulation was not as cleanly defined, and certainly not as large. It's a bit harder to decipher, but it appears the gate to gate is stronger... maybe 100kts? Max inbound/outbound of 39/62. Link to comment Share on other sites More sharing options...
mappy Posted April 4, 2012 Share Posted April 4, 2012 According to KFWD Facebook page, EF2 damage was found in Arlington https://www.facebook.com/US.NationalWeatherService.FortWorth.gov Link to comment Share on other sites More sharing options...
brettjrob Posted April 4, 2012 Share Posted April 4, 2012 I did notice that GTG shear even on the hi-res, low-scanning TDWRs (which cleanly sampled both of the supercells in question) never appeared outrageously strong, even as video showed tractor trailers flying through the sky. A lot of chaser and local video from the ground seems to suggest visually* that the upward velocities were more impressive than the tangential ones. This is a very intriguing case that I'm sure will be explored further in the future. *can't be taken as a truly reliable indicator of the real flow, of course Link to comment Share on other sites More sharing options...
EquusStorm Posted April 4, 2012 Share Posted April 4, 2012 Don't know if this has been posted, but as per FWD, Forney-Rockwall rated at least EF-3, Lancaster-Dallas-Hutchins at least EF-2, Kennedale-Arlington at least EF-2. Link to comment Share on other sites More sharing options...
Thrasher Fan Posted April 4, 2012 Share Posted April 4, 2012 BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX 102 PM CDT WED APR 4 2012 THE NATIONAL WEATHER SERVICE IN LEAGUE CITY HAS ISSUED A * TORNADO WARNING FOR... GALVESTON COUNTY IN SOUTHEASTERN TEXAS... EXTREME NORTHEASTERN BRAZORIA COUNTY IN SOUTHEASTERN TEXAS... * UNTIL 145 PM CDT * AT 1259 PM CDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM WAS LOCATED NEAR ALVIN...AND MOVING SOUTHEAST AT 10 MPH. LARGE HAIL IS ALSO EXPECTED. * LOCATIONS IMPACTED INCLUDE... ALVIN...SANTA FE AND HILLCREST. PRECAUTIONARY/PREPAREDNESS ACTIONS... TAKE COVER NOW. MOVE TO A BASEMENT OR AN INTERIOR ROOM ON THE LOWEST FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME OR OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT YOURSELF FROM FLYING DEBRIS. Link to comment Share on other sites More sharing options...
Srain Posted April 4, 2012 Share Posted April 4, 2012 Numerous ping pong ball and golfball size hail reports coming in from S of DT Houston in Brazoria/Galveston Counites. Link to comment Share on other sites More sharing options...
EquusStorm Posted April 4, 2012 Share Posted April 4, 2012 Jeeze, that TOR warned supercell outside of Houston looks quite impressive. What an isolated supercell. Link to comment Share on other sites More sharing options...
Ed Lizard Posted April 4, 2012 Share Posted April 4, 2012 Jeeze, that TOR warned supercell outside of Houston looks quite impressive. What an isolated supercell. HGX Facebook just posted this image from Alvin... DFW hail: Link to comment Share on other sites More sharing options...
Srain Posted April 4, 2012 Share Posted April 4, 2012 From Jeff: Extremely dangerous thunderstorm producing frequent reports of baseball and golfball size hail moving toward the western end of Galveston Island. As this storm passed over Alvin there have been numerous reports of baseball size hail breaking windows of vehicles and houses in and around Alvin Community College. This storm is nearing the northern side of west Bay and will be crossing into west Bay and western Galveston Island within the next 20 minutes. Although the radar is showing a weakening trend, this remains a dangerous storm. Link to comment Share on other sites More sharing options...
Srain Posted April 4, 2012 Share Posted April 4, 2012 From NESDIS: SATELLITE PRECIPITATION ESTIMATES..DATE/TIME 04/04/12 1901Z SATELLITE ANALYSIS BRANCH/NESDIS---NPPU---TEL.301-763-8678 LATEST DATA USED: GOES-13 1845Z KUSSELSON NOAA AMSU:1614Z DMSP SSMIS:1223Z . LOCATION...SE TEXAS... . ATTN WFOS...HGX... ATTN RFCS...WGRFC... . EVENT...MICROWAVE PASS SHOWING DEEP PRECIPITABLE WATER WITH OFFSHORE CONVECTIVE COMPLEX FOLLOWING ALONG OUTFLOW INTO SE TEXAS CONVECTION... . SATELLITE ANALYSIS AND TRENDS...NICE 1614Z NOAA AMSU PASS OVER THE WESTERN GULF OF MEXICO SHOWING OUTFLOW HIGHER PRECIP WATER MOISTURE TRAILING ALONG THE OUTFLOW AND BACK INTO THE SE TEXAS COAST. THIS WAS ALLOWING SMALLER COMPLEX BRAZORIA INTO GALVESTON COUNTY TO HANG TOGETHER WITH SOME EMBEDDED TRAINING CELLS. EAST EXTENT OF COMPLEX DRIFTING EAST AND SE TOWARD GULF COAST...BUT BACK EDGE MOVING SLOWLY AND CONVECTIVE CELLS TRYING TO FORM TO SOUTHWEST FOR POTENTIAL TRAINING SCENARIO...AT LEAST BRAZORIA TO NEAR WEST/SW GALVESTON COUNTY. WITH GPS PW VALUES NEAR 1.6" AND A FEW GOES SOUNDER VALUES EVEN HIGHER...CERTAINLY COULD GET AMOUNTS OF 1-1.5" PER HR WITH ISOLATED RATES TO 2.0"/HR, ESPECIALLY IF THERE ARE ANY OVERSHOOTING CLOUD TOPS LIKE 1745Z AND 1830Z. . AN ANNOTATED SATELLITE GRAPHIC SHOWING THE HEAVY PRECIPITATION THREAT AREA SHOULD BE AVAILABLE ON THE INTERNET ADDRESS LISTED BELOW IN APPROXIMATELY 10-15 MINUTES. . SHORT TERM OUTLOOK VALID 1900-2200Z...MEDIUM CONFIDENCE FACTOR IN SHORT TERM OUTLOOK...CONVECTIVE DEVELOP TO SW OF THIS SMALL COMPEX THE KEY...IF CELLS CONTINUE TO DEVELOP...THEN THERE IS A CHANCE THEY COULD FEED INTO BACK PART OF COMPEX AND CONTINUE TO GIVE BURSTS OF HVY RAIN AND INCREASE FF. BUT NO WHERE NEAR A CERTAINTY...JUST WILL HAVE TO WATCH THE CELL DEVELOPMENT AND POTENTIAL TRAINING IN MATAGORDA/WHARTON AND EAST THAT COULD GIVE ADDITIONAL HVY RAIN TO BRAZORIA AND GALVESTON COUNTY. Link to comment Share on other sites More sharing options...
thewxmann Posted April 4, 2012 Share Posted April 4, 2012 I did notice that GTG shear even on the hi-res, low-scanning TDWRs (which cleanly sampled both of the supercells in question) never appeared outrageously strong, even as video showed tractor trailers flying through the sky. A lot of chaser and local video from the ground seems to suggest visually* that the upward velocities were more impressive than the tangential ones. This is a very intriguing case that I'm sure will be explored further in the future. *can't be taken as a truly reliable indicator of the real flow, of course I did notice that too. I have a hypothesis that CAPE correlates stronger with upward velocities in a tornado, but that shear/helicity correlates stronger with the tangential velocities. Yesterday was a high CAPE/low shear day, with the former around 2000-3000 J/kg, but the latter only around 100 m2/s2. Link to comment Share on other sites More sharing options...
EquusStorm Posted April 4, 2012 Share Posted April 4, 2012 Hah that one little cluster of supercells is causing more issues than it's worth! Furthermore as they appear to be training over pretty much the same area I'd wager there is gonna be some flooding issues there as well. Not to mention more nasty hail, yikes. Also I have a hypothesis that CAPE correlates stronger with upward velocities in a tornado, but that shear/helicity correlates stronger with the tangential velocities. Yesterday was a high CAPE/low shear day, with the former around 2000-3000 J/kg, but the latter only around 100 m2/s2. Even with me being someone completely untrained in meteorology, that's incredibly fascinating. The main reason I come here is to hear people that know what they're doing put forth interesting hypothesis and explanations for severe weather events. Am I or am I not the only one that thought the videos from Dallas yesterday were like a less intense version of the Pampa tornado videos? Link to comment Share on other sites More sharing options...
JoMo Posted April 5, 2012 Share Posted April 5, 2012 Very interesting Texas tornado video. You can see the individual vorts when it hangs out over the road for a bit. Link to comment Share on other sites More sharing options...
EquusStorm Posted April 5, 2012 Share Posted April 5, 2012 That's one of the most amazing close-range videos I have ever seen. Reminds me a little of the Rice, TX video from 2010 when it crosses the highway, but even clearer. The vortex action is incredible and I wouldn't dare be as close as the folks in the cars appear to be, haha. Debris is falling absolutely everywhere. Link to comment Share on other sites More sharing options...
andyhb Posted April 5, 2012 Share Posted April 5, 2012 Excellent video there showing the complex multiple vortex structure in that tornado. Link to comment Share on other sites More sharing options...
radarman Posted April 5, 2012 Share Posted April 5, 2012 Reading reports all over that the tornado damage near Forney looked EF3+, but have to admit I'm somewhat at a loss when looking at the FWS data... The hook echo is impressive enough but the velocity signature looks really marginal for that strong of a tornado. Certainly much weaker than Arlington at the same height AGL. Link to comment Share on other sites More sharing options...
NJwinter23 Posted April 5, 2012 Share Posted April 5, 2012 Which of the EF-2 tornadoes was the one tossing the tractor trailer's around? I know it wasnt the EF3 forney tornado... I'm pretty amazed that an EF-2 could lift 10,000 lb+ objects like that and toss them around. Link to comment Share on other sites More sharing options...
David Reimer Posted April 5, 2012 Author Share Posted April 5, 2012 Which of the EF-2 tornadoes was the one tossing the tractor trailer's around? I know it wasnt the EF3 forney tornado... I'm pretty amazed that an EF-2 could lift 10,000 lb+ objects like that and toss them around. Lancaster tornado as it hit a shipping/trucking facility on Interstate 20 just east of Interstate 35E. Link to comment Share on other sites More sharing options...
David Reimer Posted April 5, 2012 Author Share Posted April 5, 2012 Reading reports all over that the tornado damage near Forney looked EF3+, but have to admit I'm somewhat at a loss when looking at the FWS data... The hook echo is impressive enough but the velocity signature looks really marginal for that strong of a tornado. Certainly much weaker than Arlington at the same height AGL. Tim Marshall actually surveyed that tornado and provided the EF-3 rating. He has several damage survey photos and thoughts on his facebook. Link to comment Share on other sites More sharing options...
NJwinter23 Posted April 5, 2012 Share Posted April 5, 2012 Lancaster tornado as it hit a shipping/trucking facility on Interstate 20 just east of Interstate 35E. Thank you Link to comment Share on other sites More sharing options...
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