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May 22-? Severe weather


MNstorms

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MESOSCALE DISCUSSION 0984

NWS STORM PREDICTION CENTER NORMAN OK

0452 PM CDT WED MAY 30 2012

AREAS AFFECTED...W CNTRL TX

CONCERNING...SEVERE POTENTIAL...WATCH LIKELY

VALID 302152Z - 302315Z

PROBABILITY OF WATCH ISSUANCE...95 PERCENT

SUMMARY...ISOLATED SUPERCELLS ARE LIKELY TO FORM AND PERSIST OVER

THE NEXT FEW HOURS...WITH A DISTINCT GIANT HAIL...DAMAGING WIND AND

ISOLATED TORNADO THREAT.

DISCUSSION...STORMS ARE BEGINNING TO ERUPT ALONG THE DRYLINE WHERE

TEMPERATURES EXCEED 100 F. MEANWHILE...SELY SURFACE WINDS ARE

MAINTAINING MID 60S F DEWPOINTS...CREATING EXTREME INSTABILITY WHEN

COUPLED WITH STEEP LAPSE RATE PROFILES ALOFT.

THE TURNING WINDS WITH HEIGHT ARE ALSO FAVORABLE FOR

SUPERCELLS...AND DESPITE MARGINAL T/TD SPREADS INITIALLY....A

TORNADO OR TWO IS POSSIBLE. LOCALLY SIGNIFICANT DAMAGING WINDS MAY

ALSO OCCUR BENEATH THESE SUPERCELLS.

..JEWELL/CORFIDI.. 05/30/2012

ATTN...WFO...FWD...EWX...SJT...LUB...MAF...

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Parts of the tornao watch were not even in the slight risk in the 20z outlook and most had less then 2% TOR probs

URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 324

NWS STORM PREDICTION CENTER NORMAN OK

410 PM CST WED MAY 30 2012

THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF

WEST CENTRAL TEXAS

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 410 PM UNTIL

1100 PM CST.

TORNADOES...HAIL TO 4 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.

DISCUSSION...TSTMS ARE STARTING TO FORM ALONG ARCED DRY LINE OVER

ERN PARTS OF THE PERMIAN BASIN AND THE WRN HILL COUNTRY/BIG COUNTRY.

STORMS ARE DEVELOPING IN A RELATIVELY MOIST /AVERAGE SFC DEW POINTS

MID 60S F/ BOUNDARY LAYER WITH STEEP LOW TO MID LVL LAPSE RATES.

COUPLED WITH PRESENCE OF ENHANCED WLY MID-UPR LVL FLOW /AOA 40 KTS

AT 500 MB/ ASSOCIATED WITH SRN STREAM JET...SETUP MAY SUPPORT A FEW

INTENSE SUPERCELLS CAPABLE OF VERY LARGE HAIL...DMGG WIND...AND

TORNADOES. POTENTIAL ALSO WILL EXIST FOR THE STORMS TO MERGE INTO

ONE OR TWO MULTI-COUNTY CLUSTERS. IF SUCH A SCENARIO

UNFOLDS...EMBEDDED CIRCULATIONS MAY EXTEND THE SVR THREAT SSEWD

THROUGH LATE EVE.

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BULLETIN - EAS ACTIVATION REQUESTED

TORNADO WARNING

NATIONAL WEATHER SERVICE SAN ANGELO TX

533 PM CDT WED MAY 30 2012

THE NATIONAL WEATHER SERVICE IN SAN ANGELO HAS ISSUED A

* TORNADO WARNING FOR...

CENTRAL TAYLOR COUNTY IN WEST CENTRAL TEXAS...

* UNTIL 600 PM CDT

* AT 531 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A

TORNADO WAS 9 MILES WEST OF LAKE ABILENE...OR 18 MILES NORTHEAST OF

BLACKWELL...MOVING EAST AT 15 MPH. SOME ROADS IN THE PATH OF THIS

STORM INCLUDE U.S. HIGHWAY 277.

IN ADDITION TO DANGEROUS TORNADIC WINDS...OTHER HAZARDS INCLUDE...

LARGE DAMAGING HAIL UP TO GOLF BALL SIZE.

DAMAGING STRAIGHT LINE WINDS IN EXCESS OF 60 MPH.

POTENTIALLY DEADLY LIGHTNING.

* THE TORNADO IS EXPECTED TO BE NEAR...

LAKE ABILENE BY 600 PM CDT...

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BULLETIN - EAS ACTIVATION REQUESTED

TORNADO WARNING

NATIONAL WEATHER SERVICE LUBBOCK TX

535 PM CDT WED MAY 30 2012

THE NATIONAL WEATHER SERVICE IN LUBBOCK HAS ISSUED A

* TORNADO WARNING FOR...

SOUTHEASTERN HALL COUNTY IN THE PANHANDLE OF TEXAS.

SOUTHWESTERN CHILDRESS COUNTY IN THE PANHANDLE OF TEXAS.

NORTHERN COTTLE COUNTY IN NORTHWEST TEXAS.

* UNTIL 600 PM CDT

* AT 532 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A

SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THE MOST

DANGEROUS PART OF THIS STORM WAS LOCATED NEAR TELL...OR ABOUT 11

MILES SOUTHWEST OF CHILDRESS...MOVING SOUTHEAST AT 25 MPH. ANOTHER

STORM CAPABLE OF PRODUCING A TORNADO IS LOCATED 5 MILES NORTHEAST

OF PADUCAH MOVING SOUTHEAST AT 20 MPH.

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531 PM CDT WED MAY 30 2012

...A TORNADO WARNING REMAINS IN EFFECT FOR CENTRAL LOGAN COUNTY UNTIL

545 PM CDT...

AT 529 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A

SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS

STORM WAS LOCATED 5 MILES NORTHEAST OF WINONA...AND WAS MOVING

SOUTHEAST AT 25 MPH. SPOTTERS REPORTED A POSSIBLE JUST EAST OF

WINONA.

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I wonder if this low-correlation coefficient area on this storm (south of Colby KS) is tornado debris. It is close to the mesocyclone/couplet on the storm. I just learned about the dual-pol stuff, so I don't know for sure.

Taking a look at it, it seems to me like there could be a little beam filling issue occurring with that cell, not quite NBF but probably a rain/hail mixture resulting in low CC. Since the feature is sort of linear in nature and moves with the storm, that would be my guess.

For those curious, NBF (non-uniform beam filling) occurs when the radar beam volume samples a gradient of precipitation types (i.e. hail, then rain and hail, then rain as you transition down through the volume). Each p-type affects the phase shift of the power differently (with liquid water creating the greatest shift). So when different parts of the beam experience different phase shifts, you will get a large wedge of very low CC down radial from the storm.

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MESOSCALE DISCUSSION 0986

NWS STORM PREDICTION CENTER NORMAN OK

0547 PM CDT WED MAY 30 2012

AREAS AFFECTED...WRN OK

CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE

VALID 302247Z - 310015Z

PROBABILITY OF WATCH ISSUANCE...60 PERCENT

SUMMARY...A FEW SEVERE STORMS MAY OCCUR OVER WRN OK...WITH MAINLY AN

HAIL AND WIND THREAT. A NARROW N/S WATCH MAY BE NEEDED SOON.

DISCUSSION...STORMS HAVE DEVELOPED OVER WRN/SWRN OK...E OF THE TX

ACTIVITY WHERE CAPPING HAS BEEN LOCALLY BREACHED. THESE STORMS ARE

RELATIVELY WEAK AT THIS TIME...BUT STEEP LAPSE RATE PROFILES AND

NWLY DEEP LAYER SHEAR AROUND 40 KT WILL FAVOR SOME FURTHER

ORGANIZATION.

BOUNDARY LAYER TEMPERATURE/DEWPOINT SPREADS ARE CURRENTLY AROUND 25

F...DUE TO MARGINAL LOW LEVEL MOISTURE WITH DEWPOINTS ONLY IN THE

UPPER 50S TO LOWER 60S F. HOWEVER...CONDITIONS MAY CHANGE THIS

EVENING WITH A PERSISTENT SLY LOW LEVEL JET AND SOME HIGHER THETA-E

OVER NWRN TX.

..JEWELL/CORFIDI.. 05/30/2012

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