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Multiple Tornadic Supercells on Wednesday

10:53 am in Extreme Weather, Storm Summaries by Ted Keller

Hail near Brighton

A pre-Thanksgiving outbreak of supercell thunderstorms occurred on Wednesday the 24th in the Ozarks.  Some produced tornadoes.

It would be a challenge for me to count them from memory!  I know that several passed over the same corridor affecting portions of Vernon, Cedar, St Clair, Hickory, Polk, Dallas and Camden counties.  This was the earlier portion of the outbreak from mid afternoon through early evening. 

Damage was reported near Wheatland and Cross Timbers in Hickory County from this early round.  This was confirmed as two tornadoes today by the National Weather Service. 

Later in the evening, the supercells started shifting more to the south.  One cell starting ramping up significantly as it crossed into northwestern Greene county.  This storm continued east-northeast into southern and southeastern Polk.  This storm was responsible for multiple reports of damage near Brighton on the Greene/Polk county line. This too was confirmed as an EF1 tornado by the National Weather Service today.

Looking North from Hermitage. Photo by Ron Gamble.

A supercell started showing signs of rotation in Jasper and Newton county shortly before 8 pm.  This storm remained tornado-warned as it traveled into Lawrence county.  This was of course a concern for Greene county as it approached.  As it crossed the county and city of Springfield, multiple reports of hail from quarter to as high as ping-pong ball sized were reported.  There was also some minor wind damage.  The tornado warning picked up again as it was just leaving Greene and continued through Webster and Wright counties!

Dent county went tornado-warned for a time late in the evening followed by the final warning in Barry county just before 11 pm and into the 11 o’clock hour.

The National Weather Service has a full report on this storm.

The Lebanon, MO Tornado November 10th, 1995

9:14 pm in Severe Storms, Storm Summaries, The Ozarks by Ted Keller

Storm-Relative Velocity Showing the Couplet Near Lebanon at About 5 pm

This was an interesting storm for several reasons. 

First, it was a November tornado.  Actually, we shouldn’t be that surprised at this because the Ozarks have always had a significant “second season” of tornadoes which peaks in November and December, especially when it comes to outbreaks of tornadoes. 

November, and all of the months of winter too, are considered to be the “cool season” with regard to tornado development.  Most people don’t think of this period as being a particularly threatening time for tornadoes.  But the fact is that when tornado conditions develop during the cool season, the tornado threat is just as real as anything in the heart of May!

Cool season tornadoes are dangerous for reasons beyond just public apathy.  Because the length of daylight is very short, it is likely that cool season tornadoes will be nocturnal. (occurring at night)  Now, they may simply be late afternoon or evening storms which are nocturnal because of the time of year.  Or they may be storms which develop after the late news or worse after the majority of people of gone to bed.  Such overnight storms are often aided by the natural strong jet stream patterns found during the cool season which can force tornadic conditions anytime , not necessarily favoring the peak heating of late afternoon and evening.  This tornado touched down before sunset.

In the writing of this report, I requested the radar data archive for this date.  It showed a broken line of storms, many of which were taking on supercell characteristics.   I recorded a loop of these storms in the 5 o’clock hour.  The green triangle is a “scit” where the computer has tagged tight rotation in a storm.  It lasts for two frames or about eight minutes as it zips across south Lebanon.  This tornado tore apart Tracker Marine in Lebanon, throwing boats everywhere.  It crossed I-44 and did other damage to homes.

What I really find quite interesting in this post analysis of the event is the intensity of a storm immediately to the southwest of the Lebanon storm, also shown in the radar loop.  This storm had a more persistent and stronger rotation couplet associated with it reaching a peak near Twin Bridges south of Lebanon at around 5:24 pm!  Yet there were no tornado reports with this storm.  A curiosity.

One last note: this tornado occurred ahead of a powerful cold front!  I distinctly remember working this night and while trying to stay ahead of  the tornado warnings, I glanced over into eastern Kansas and saw what sure looked like a signature of snow on radar there!  In fact, it was snow and the area received a light accumulation of snow later that night and early in the morning!

Tornadic Week

6:13 pm in Extreme Weather, Storm Summaries by Ted Keller

We’ve had a lot of noteworthy tornadoes last week in the U.S.

On Wednesday, September 15th, severe storms sprang up violently over portions of southcentral and southeastern Kansas.  Discrete supercell storms produced both tornadoes and extremely large hail. In fact, a new state record for large hail may be threatened in Kanasa as a result of these storms.  The Wichita NWS has an excellent summary of the severe weather outbreak.

Later that same evening, the individual cells merged into a severe squall line with bowing line segments as it finished moving through eastern Kansas and then headed into the Ozarks.  Shortlly before 11 pm, a weak EF0 tornado was on the ground for only one half mile about 4-5 southwest of Nixa.  The Springfield NWS has a review of the tornado as well as downbursts and heavy rain in southwest Missouri on this day.

On Thursday, September 16th, a cool front was responsible for two additional tornadic areas.  In New York City, the National Weather Service confrms two tornadoes within the city limits.  An EF0 tornado touched down in Brooklyn while an EF1 rating was attatched to a Flushing/Bayside twister in Queens.  The storm killed one person.  A link to the news story and to the NWS report.

Also on Thursday, severe thunderstorms formed in southeastern Ohio and traveled southeast into West Virginia, producing tornadoes including two EF3’s and several EF2’s.

EF0 Tornado/Wind Damage Wednesday Evening

8:24 pm in Extreme Weather, Storm Summaries by Ted Keller

The Springfield National Weather Service performed damage surveys today and determined an EF0 tornado touched down southwest of Nixa Wednesday evening.  Here is the storm report.

Additionally, a mircroburst produced wind damage west of Turners.  Several other microbursts were reported in Rogersville and near Fordland.

I have radar data processing and will update this story tomorrow.

Event summary page from the Springfield National Weather Service.

EF SCALE
EF Rating 3 Second Gust (mph)
0 65-85
1 86-110
2 111-135
3 136-165
4 166-200
5 Over 200

Wichita Hail and Severe Storms

9:48 am in Extreme Weather, Severe Storms, Storm Summaries by Ted Keller

Wichita Hail by Jim Weber

Link to the Wichita NWS report

Some of the hail video I’ve saved under Favorites in my YouTube account.

A Mini Bowing Thunderstorm Line

10:13 am in Extreme Weather, Storm Summaries, The Ozarks by Ted Keller

Storm Reports as of 10:35 Sunday

A cluster of thunderstorms which started in Kansas Saturday evening, crossed into Missouri and left a swath of wind damage!

The bowing refers to the shape of the mini line of storms as it advances. This is shown clearly in the embedded loop of radar from early Sunday morning (below).

This line produced scattered wind damage reports from southern Crawford County in Kansas into Dade and eventually Greene County.  There were lots of reports of small limbs down and outdoor objects such as potted plants “displaced”.  The Springfield National Weather Service reported a wind gust to 51 ph at 2:10 am.  There were likely some severe wind gusts (59 mph or higher ) with this storm line.  Several minor power outages were reported with this storm line as well.

Storm Reports Collected by the National Weather Service

PRELIMINARY LOCAL STORM REPORT…SUMMARY
NATIONAL WEATHER SERVICE SPRINGFIELD MO
633 AM CDT SUN AUG 15 2010
..TIME…   …EVENT…      …CITY LOCATION…     …LAT.LON…
.DATE…   ….MAG….      ..COUNTY LOCATION..ST.. …SOURCE….
            ..REMARKS..1224 AM     TSTM WND DMG     4 SW FRONTENAC          37.41N 94.73W
08/15/2010                   CRAWFORD           KS   LAW ENFORCEMENT
            FRONT PORCH PULLED FROM HOUSE. TIME ESTIMATED.1224 AM     TSTM WND DMG     2 S PITTSBURG           37.38N 94.70W
08/15/2010                   CRAWFORD           KS   LAW ENFORCEMENT
            FOUR TREES REPORTED DOWN ON THE SOUTH SIDE OF PITTSBURG.
            TIME ESTIMATED.0140 AM     TSTM WND GST     LOCKWOOD                37.39N 93.95W
08/15/2010  E60.00 MPH       DADE               MO   LAW ENFORCEMENT
            50 TO 60 MPH WIND GUST ESTIMATED BY DEPUTY IN THE CITY OF
            LOCKWOOD.0140 AM     TSTM WND GST     GREENFIELD              37.42N 93.84W
08/15/2010  E60.00 MPH       DADE               MO   LAW ENFORCEMENT

            50 TO 60 MPH WIND GUST ESTIMATED AT THE DADE EOC.0145 AM     TSTM WND DMG     GREENFIELD              37.42N 93.84W
08/15/2010                   DADE               MO   LAW ENFORCEMENT
            SEVERAL TREES DOWN IN GREENFIELD…A FEW WITH A DIAMETER
            UP TO 18 INCHES.

0145 AM     TSTM WND DMG     LOCKWOOD                37.39N 93.85W
08/15/2010                   DADE               MO   LAW ENFORCEMENT

            TWO TREES DOWN ACROSS THE ROAD NEAR THE INTERSECTION OF
            HIGHWAYS 160 AND 39.

0200 AM     TSTM WND GST     EVERTON                 37.34N 93.70W
08/15/2010  E60.00 MPH       DADE               MO   LAW ENFORCEMENT

            50 TO 60 MPH WIND GUSTS ESTIMATED BY SPOTTER IN EVERTON.

0210 AM     NON-TSTM WND GST 5 SSE WILLARD           37.23N 93.40W
08/15/2010  M51.00 MPH       GREENE             MO   OFFICIAL NWS OBS

            51 MPH WIND GUST WITH THE OUTFLOW BOUNDARY AHEAD OF MAIN
            COMPLEX OF THUNDERSTORMS.

0217 AM     NON-TSTM WND GST NIXA                    37.04N 93.29W
08/15/2010  E50.00 MPH       CHRISTIAN          MO   AMATEUR RADIO

            50 MPH WIND GUST WITH THE PASSAGE OF THE OUTFLOW
            BOUNDARY.

0255 AM     TSTM WND DMG     SSE STRAFFORD           37.27N 93.12W
08/15/2010                   GREENE             MO   AMATEUR RADIO

            10 FOOT SECTION OF WOOD FENCING BLOWN DOWN…A FEW TREE
            LIMBS UP TO THREE INCHES IN DIAMETER BLOWN DOWN. TIME
            ESTIMATED.

0258 AM     TSTM WND DMG     2 WNW FAIR GROVE        37.39N 93.19W
08/15/2010                   GREENE             MO   AMATEUR RADIO

            FOUR INCH DIAMETER DOGWOOD TREE BLOWN DOWN.

0300 AM     TSTM WND DMG     1 N STRAFFORD           37.29N 93.12W
08/15/2010                   GREENE             MO   AMATEUR RADIO

            14 INCH DIAMETER TREE DOWN ON POWER LINE. PART OF FARM
            ROAD 84 BLOCKED IN THIS AREA.

0318 AM     NON-TSTM WND GST AVA                     36.95N 92.66W
08/15/2010  M38.00 MPH       DOUGLAS            MO   AMATEUR RADIO

            38 MPH WIND GUST MEASURED WITH OUTFLOW BOUNDARY PASSAGE.
            FLAG POLE AT AVA POLICE DEPARTMENT BLOWN DOWN.

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