SmokeEater Posted March 23, 2011 Share Posted March 23, 2011 SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 717 PM CDT TUE MAR 22 2011 IAC001-121-175-230030- /O.CON.KDMX.TO.W.0011.000000T0000Z-110323T0030Z/ UNION IA-ADAIR IA-MADISON IA- 717 PM CDT TUE MAR 22 2011 ...A TORNADO WARNING REMAINS IN EFFECT FOR MADISON...SOUTHEASTERN ADAIR AND NORTH CENTRAL UNION COUNTIES UNTIL 730 PM CDT... AT 714 PM CDT...TRAINED WEATHER SPOTTERS REPORTED A TORNADO JUST SOUTHWEST OF WINTERSET. THIS TORNADO WAS LOCATED NEAR WINTERSET...OR 23 MILES NORTHEAST OF CRESTON...MOVING EAST AT 55 MPH. LOCATIONS IMPACTED INCLUDE... EAST PERU. Link to comment Share on other sites More sharing options...
Iastfan112 Posted March 23, 2011 Share Posted March 23, 2011 No impressive T storms this far north but boy has the wind kicked in on the backside, got a 48 mph gust awhile ago on my weath station, made life miserable doing the animal chores on my grandparent farm this evening. Link to comment Share on other sites More sharing options...
SmokeEater Posted March 23, 2011 Share Posted March 23, 2011 BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE DES MOINES IA 731 PM CDT TUE MAR 22 2011 THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A * TORNADO WARNING FOR... NORTHEASTERN MADISON COUNTY IN SOUTH CENTRAL IOWA... NORTHERN WARREN COUNTY IN SOUTH CENTRAL IOWA... * UNTIL 800 PM CDT * AT 728 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM WAS LOCATED NEAR WINTERSET...OR 19 MILES WEST OF INDIANOLA... AND MOVING EAST AT 45 MPH. * LOCATIONS IMPACTED INCLUDE... INDIANOLA...NORWALK...CARLISLE...BEVINGTON...ST. MARYS... MARTENSDALE...CUMMING...SPRING HILL...ACKWORTH...HARTFORD AND SANDYVILLE. Link to comment Share on other sites More sharing options...
Jonbo Posted March 23, 2011 Share Posted March 23, 2011 I left once the rain started hitting harder and there was talk it was rain wrapped. Didn't want to get myself caught up in it if it went near me. Drive home was another story...(everything safe and clear) Link to comment Share on other sites More sharing options...
OceanStWx Posted March 23, 2011 Share Posted March 23, 2011 From KCCI's webcam in Creston, IA.. Link to comment Share on other sites More sharing options...
Stebo Posted March 23, 2011 Share Posted March 23, 2011 From KCCI's webcam in Creston, IA.. Very nice funnel, tough to tell with the building in the way if it extended all the way to the surface though. Link to comment Share on other sites More sharing options...
cyclone77 Posted March 23, 2011 Share Posted March 23, 2011 Sounds like SPC is working on a new MD (#251). Link to comment Share on other sites More sharing options...
Thundersnow12 Posted March 23, 2011 Share Posted March 23, 2011 Sounds like SPC is working on a new MD (#251). MESOSCALE DISCUSSION 0251 NWS STORM PREDICTION CENTER NORMAN OK 0800 PM CDT TUE MAR 22 2011 AREAS AFFECTED...SERN IA...NERN MO AND W-CNTRL IL CONCERNING...SEVERE POTENTIAL...WATCH LIKELY VALID 230100Z - 230200Z THREAT FOR SEVERE STORMS COULD SHIFT INTO SERN IA...NERN MO AND POSSIBLY W-CNTRL IL THIS EVENING. WW 53 WILL LIKELY NEED TO BE REPLACED BY ANOTHER WW BEFORE 02Z. HOWEVER...OVERALL SEVERE THREAT DOES NOT APPEAR AS GREAT AS EARLIER THIS EVENING. TREND HAS BEEN FOR STORMS TO EVOLVE INTO LINES ACROSS S-CNTRL IA AS COLD FRONT OVERTAKES THE DRYLINE...AND SOME SWD DEVELOPMENT INTO NRN MO IS POSSIBLE AS THIS PROCESS CONTINUES. DISCRETE SUPERCELLS IN WARM SECTOR HAVE WEAKENED AS THE BOUNDARY LAYER STABILIZES AND STORMS CROSS ONTO THE COOL SIDE OF WARM FRONT. SURFACE HIGH PRESSURE ANCHORED OVER SERN CANADA EXTENDING INTO THE GREAT LAKES WILL TEND TO INHIBIT NWD PROGRESSION OF WARM FRONT CURRENTLY EXTENDING ACROSS SRN IA. INSTABILITY DECREASES WITH ERN EXTENT THROUGH WARM SECTOR ACROSS SERN IA...NERN MO AND W-CNTRL IL DUE TO WIDESPREAD CLOUDS EARLIER TODAY. WITH ONSET OF NOCTURNAL COOLING...BOUNDARY LAYER WILL LIKELY REMAIN RELATIVELY STABLE...AND THIS SHOULD SERVE AS A LIMITING FACTOR FOR A MORE ROBUST SEVERE THREAT. NEVERTHELESS...FORCING ASSOCIATED WITH NEWD EJECTING VORT MAX AND ATTENDANT COLD FRONT MAY BE SUFFICIENT TO MAINTAIN LINE OF STORMS THROUGH SERN IA AND NERN MO NEXT FEW HOURS. STORMS WILL REMAIN EMBEDDED WITHIN STRONG VERTICAL SHEAR SUPPORTIVE OF SUPERCELLS AND BOWING SEGMENTS. WHILE AN ISOLATED TORNADO OR TWO CANNOT BE RULED OUT...SEVERE THREAT APPEARS TO BE TRANSITIONING TO ISOLATED DAMAGING WIND AND HAIL. Link to comment Share on other sites More sharing options...
brettjrob Posted March 23, 2011 Share Posted March 23, 2011 Very nice funnel, tough to tell with the building in the way if it extended all the way to the surface though. Multiple chasers reported it on the ground, and it apparently did some damage in town. Hopefully video will be up soon on YT. I guess I should stop writing off these seemingly marginal chase ops just because of distance. Link to comment Share on other sites More sharing options...
SmokeEater Posted March 23, 2011 Share Posted March 23, 2011 URGENT - IMMEDIATE BROADCAST REQUESTED TORNADO WATCH NUMBER 54 NWS STORM PREDICTION CENTER NORMAN OK 835 PM CDT TUE MAR 22 2011 THE NWS STORM PREDICTION CENTER HAS ISSUED A TORNADO WATCH FOR PORTIONS OF PARTS OF SOUTHERN IOWA LARGE PART OF NORTHERN MISSOURI EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 835 PM UNTIL 200 AM CDT. TORNADOES...HAIL TO 2 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 50 STATUTE MILES EAST AND WEST OF A LINE FROM 30 MILES NORTHEAST OF OTTUMWA IOWA TO 5 MILES SOUTH SOUTHEAST OF CHILLICOTHE MISSOURI. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4). 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. OTHER WATCH INFORMATION...THIS TORNADO WATCH REPLACES TORNADO WATCH NUMBER 53. WATCH NUMBER 53 WILL NOT BE IN EFFECT AFTER 835 PM CDT. DISCUSSION...LINE OF SEVERE THUNDERSTORMS WILL MOVE EWD ACROSS WATCH AREA THRU THE EVENING. WITH VERY STRONG SHEAR PROFILES...MARGINAL BUT SUFFICIENT INSTABILITY IS AVAILABLE TO MAINTAIN THE THREAT OF EMBEDDED SUPERCELLS/TORNADOES WITHIN THE LINE. IN ADDITION DAMAGING WINDS ARE LIKELY...PARTICULARLY IN BOWING SEGMENTS. AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM MOTION VECTOR 24035. ...HALES Link to comment Share on other sites More sharing options...
brettjrob Posted March 23, 2011 Share Posted March 23, 2011 Looking ahead to Thursday... we'll watch a beautiful low-amplitude but potent shortwave trough go to waste over the Southern Plains because of the surface ridge building down from the Great Lakes. The good juice never even gets pushed past the Gulf Coast with this current cold front, yet it won't be able to return at all into NW TX by Thursday afternoon. This perpetual eastern troughing thing is getting old real fast. Link to comment Share on other sites More sharing options...
Iastfan112 Posted March 23, 2011 Share Posted March 23, 2011 Interesting news just from my north evidently there was some localized significant damage at my uncles and aunts: lost 2 trees, a shed and the tin roof off another shed. I wonder what was going on inside the little storm you can see at the beginning of this frame. http://www.weather.com/weather/map/interactive/Badger+IA+USIA0056?animation=true Link to comment Share on other sites More sharing options...
hawkeye_wx Posted March 23, 2011 Share Posted March 23, 2011 It's not often I get a nice lightning display while at the same time I can see my breath. Link to comment Share on other sites More sharing options...
Thundersnow12 Posted March 23, 2011 Share Posted March 23, 2011 Hopefully 0-6km shear of 70-90kts, nice mid-level lapse rates, and MUCAPE values between 500-1000 j/kg will keep this line truckin' along to get over to here later tonight. Link to comment Share on other sites More sharing options...
hawkeye_wx Posted March 23, 2011 Share Posted March 23, 2011 Not getting anything near severe, but it's a pretty good storm for March. There's a good amount of lightning with a constant low rumble of thunder. The heaviest stuff is hitting the south side of CR down into the northern part of the next county. Link to comment Share on other sites More sharing options...
baroclinic_instability Posted March 23, 2011 Share Posted March 23, 2011 From KCCI's webcam in Creston, IA.. Video someone uploaded to youtube. Link to comment Share on other sites More sharing options...
cyclone77 Posted March 23, 2011 Share Posted March 23, 2011 The line of storms in eastern Iowa still looks relatively impressive, but the lack of severe reports gives credit to the NWS letting all the warnings expire. Link to comment Share on other sites More sharing options...
OceanStWx Posted March 23, 2011 Share Posted March 23, 2011 The line of storms in eastern Iowa still looks relatively impressive, but the lack of severe reports gives credit to the NWS letting all the warnings expire. 50 knot gust at DVN. Edit: It's never a 49 knot gust either Link to comment Share on other sites More sharing options...
OceanStWx Posted March 23, 2011 Share Posted March 23, 2011 Impressive that it is occurring at 46/43. Link to comment Share on other sites More sharing options...
cyclone77 Posted March 23, 2011 Share Posted March 23, 2011 Impressive that it is occurring at 46/43. I noticed there was a gust front out ahead of the main line, but figured it wasn't impacting the surface given the ambient conditions. Maybe the inversion is so shallow that the winds are able to reach the surface easier? Link to comment Share on other sites More sharing options...
cyclone77 Posted March 23, 2011 Share Posted March 23, 2011 And with that we're now under a severe thunderstorm warning for strong winds. Was expecting more of a hail threat here, and not wind, so this is interesting.... UNTIL 1215 AM CDT. * AT 1109 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. THESE STORMS WERE LOCATED APPROXIMATELY ALONG A LINE EXTENDING FROM 7 MILES WEST OF LONG GROVE TO BLUE GRASS TO ELIZA TO MORNING SUN...OR ALONG A LINE EXTENDING FROM 11 MILES NORTHWEST OF DAVENPORT TO 9 MILES SOUTHEAST OF DURANT TO 8 MILES SOUTHEAST OF MUSCATINE TO 7 MILES SOUTHWEST OF WAPELLO...AND MOVING EAST AT 50 MPH. * OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO MANNON...BUFFALO...TOOLESBORO...ANDALUSIA...NEW BOSTON... ELDRIDGE...HAMLET...MILLERSBURG...JOY...TAYLOR RIDGE...OAKVILLE... ROCK ISLAND...REYNOLDS...ROCK ISLAND ARSENAL...MILAN...OAK GROVE... KEITHSBURG...BETTENDORF...MOLINE QUAD-CITY AIRPORT...RIVERDALE... MOLINE...ALEDO...EAST MOLINE...PRINCETON...COAL VALLEY... MATHERVILLE...HAMPTON...CORDOVA...SHERRARD...SILVIS...BODEN...LE CLAIRE...SHALE CITY...SEATON...PORT BYRON...RAPIDS CITY...CABLE... COLONA...WARNER...VIOLA...CLEVELAND...OSBORN...ORION...BURGESS... LYNN CENTER...NEW WINDSOR...ANDOVER...ERIE...GENESEO...ALPHA... CAMBRIDGE...NORTH HENDERSON...WOODHULL...PROPHETSTOWN...LYNDON... ATKINSON...HOOPPOLE...ANNAWAN...KEWANEE AND GALVA. Link to comment Share on other sites More sharing options...
Hoosier Posted March 23, 2011 Share Posted March 23, 2011 I noticed there was a gust front out ahead of the main line, but figured it wasn't impacting the surface given the ambient conditions. Maybe the inversion is so shallow that the winds are able to reach the surface easier? The 3z RUC sounding for DVN has a pretty stout inversion in the 950-900 mb layer. Link to comment Share on other sites More sharing options...
Thundersnow12 Posted March 23, 2011 Share Posted March 23, 2011 getting some more stratiform rain now behind themain line as it loses some of its punch on the north end. Link to comment Share on other sites More sharing options...
cyclone77 Posted March 23, 2011 Share Posted March 23, 2011 getting some more stratiform rain now behind themain line as it loses some of its punch on the north end. Yeah the line north of I-80 is really beginning to wane. Doubt we'll see more than a 30-40mph wind gust here. South of I-80 there could still be some strong gusts. The warm front down there could still cause a brief "spin up" as well. Link to comment Share on other sites More sharing options...
cyclone77 Posted March 23, 2011 Share Posted March 23, 2011 Actually sort of impressed by the winds here. Only gusting to 40-45mph, but the fact that we went from due east winds to strong westerlies in a matter of minutes is very interesting. Also of note, our pressure rose from 999.4mb to 1004.2mb over the past 5 minutes. Link to comment Share on other sites More sharing options...
OceanStWx Posted March 23, 2011 Share Posted March 23, 2011 Actually sort of impressed by the winds here. Only gusting to 40-45mph, but the fact that we went from due east winds to strong westerlies in a matter of minutes is very interesting. Also of note, our pressure rose from 999.4mb to 1004.2mb over the past 5 minutes. That type of rise/fall couplet will definitely help drive stronger wind gusts. It's interesting how the base velocity images from DVN look "wavy." There appear to be multiple gust fronts, and the radar is indicating winds (or at least scatterers) are reversing their direction at times. I wonder if the convection is acting upon that inversion and inducing a gravity wave type thing. The presentation on radar is very similar. Link to comment Share on other sites More sharing options...
cyclone77 Posted March 23, 2011 Share Posted March 23, 2011 That type of rise/fall couplet will definitely help drive stronger wind gusts. It's interesting how the base velocity images from DVN look "wavy." There appear to be multiple gust fronts, and the radar is indicating winds (or at least scatterers) are reversing their direction at times. I wonder if the convection is acting upon that inversion and inducing a gravity wave type thing. The presentation on radar is very similar. Yeah the appearance of those waves look similar to the waves we saw in the blizzard. The strong winds here lasted about 10 minutes, which is longer than a normal gust front. With a normal gust front you get a few strong gusts at the beginning, and then lighter winds. With this the winds stayed strong, if not even stronger for up to 10+ minutes. Edit: Very heavy rain falling right now. Thought we were getting small hail, but as it turns out it's just very large drops within the downpour. Link to comment Share on other sites More sharing options...
Justin Posted March 23, 2011 Share Posted March 23, 2011 Had a brief gust to 52mph here on the leading edge but not much more than a garden variety thunderstorm outside of that brief gust. This seems to be more of a warning for the first borderline storm of the year type deal, plus its occurring later in the evening. Looking forward to much more of this as we get further into Spring. Interestingly, will be fun to see how much snow we now get Friday Night into Saturday. I lol'd a bit last week when one of our local meteorologists said he was confident we were done with snow. I thought to myself its way, way to early to make that claim and he's gonna get burned. Link to comment Share on other sites More sharing options...
OceanStWx Posted March 23, 2011 Share Posted March 23, 2011 Yeah the appearance of those waves look similar to the waves we saw in the blizzard. The strong winds here lasted about 10 minutes, which is longer than a normal gust front. With a normal gust front you get a few strong gusts at the beginning, and then lighter winds. With this the winds stayed strong, if not even stronger for up to 10+ minutes. Edit: Very heavy rain falling right now. Thought we were getting small hail, but as it turns out it's just very large drops within the downpour. Notice the change in appearance north of I-80 and south. Almost right where the warm front is. Link to comment Share on other sites More sharing options...
cyclone77 Posted March 23, 2011 Share Posted March 23, 2011 Notice the change in appearance north of I-80 and south. Almost right where the warm front is. Yeah the line north of the front is basically gone now. Just an area of anvil rains with embedded thunder. There's actually a decent amount of lightning here right now, but it's all aloft/intra-cloud. It's funny how this almost seems like a typical decaying severe weather setup here, but temps are only about 10 degrees away from this being freezing rain. Link to comment Share on other sites More sharing options...
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