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April 12th/13th and 15-16th Severe Weather Thread


andyhb

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URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 160

NWS STORM PREDICTION CENTER NORMAN OK

130 PM CDT FRI APR 13 2012

THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF

OKLAHOMA

A SMALL PART OF NORTHWEST TEXAS

EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 130 PM UNTIL 900

PM CDT.

TORNADOES...HAIL TO 3 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 60 STATUTE

MILES EAST AND WEST OF A LINE FROM 35 MILES WEST OF WICHITA FALLS

TEXAS TO 20 MILES NORTH NORTHWEST OF PONCA CITY OKLAHOMA. FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU0).

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...STORMS ARE BEGINNING TO DEVELOP OVER SWRN OK AS THE CAP

HAS WEAKENED WITHIN A STRONGLY UNSTABLE ENVIRONMENT WITH MLCAPE OF

2000-2500 J/KG. ALTHOUGH DYNAMIC FORCING FOR LARGE SCALE ASCENT IS

SUBTLE...NUMERICAL GUIDANCE INDICATES THAT STORMS WILL CONTINUE TO

DEVELOP TOWARD NRN OK THIS AFTERNOON...WITH CONVECTIVE POTENTIAL

ALSO INCREASING ALONG THE NWRN EDGE OF MOISTURE AS IT RETREATS NWWD

LATER THIS AFTERNOON AND EVENING. DEEP LAYER SHEAR OF 40 KT IN THE

LOWEST 6 KM WILL FAVOR FORMATION OF SUPERCELL STRUCTURES...WITH AN

INITIAL THREAT FOR LARGE HAIL AND STRONG WIND GUSTS. WITH

TIME...LOW LEVEL WINDS/SHEAR WILL STRENGTHEN WITH A SUBSEQUENT

INCREASE IN TORNADO POTENTIAL LATER THIS AFTERNOON AND EVENING.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

550. MEAN STORM MOTION VECTOR 23025.

...WEISS

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BULLETIN - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WARNING

NATIONAL WEATHER SERVICE NORMAN OK

142 PM CDT FRI APR 13 2012

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...

FOARD COUNTY IN NORTH CENTRAL TEXAS...

HARDEMAN COUNTY IN NORTH CENTRAL TEXAS...

EXTREME WEST CENTRAL WILBARGER COUNTY IN NORTH CENTRAL TEXAS...

* UNTIL 230 PM CDT

* AT 140 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED

A SEVERE THUNDERSTORM CAPABLE OF PRODUCING LARGE DAMAGING HAIL UP

TO GOLF BALL SIZE AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS

STORM WAS LOCATED 10 MILES NORTHEAST OF HACKBERRY OR 20

MILES WEST OF CROWELL...MOVING NORTHEAST AT 35 MPH.

* LOCATIONS IMPACTED INCLUDE...

QUANAH...CROWELL...MEDICINE MOUND...MARGARET...THALIA...

COPPERS BREAK STATE PARK AND RAYLAND.

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Very clear trend on that loop, and it supports the additional area of high risk.

I think its telling the values are only peaking in the 20-30 range across OK/S KS. Not that those aren't significant values...but the extreme values are clustering North. I think the idea that the most violent tornado threat (especially considering storm coverage concerns) may be shifting to NE/IA is gaining credibility fast.

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Very clear trend on that loop, and it supports the additional area of high risk.

im sorta wondering why those areas now in high were in slight this morning. multiple models have indicated that area has pretty solid potential for a day or two.

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I'm trying to jog my brain, has the SREF's sigtor ever hit the 50 like we see today on the 09z for 0z Sunday?

That's crazy...along the same lines, do you remember the wording the week leading up to April 27 last year? I remember mention of EHI values topping to the 14-20+ range...

Is it possible to see EHI values escalate north of the high 10-12 range we're currently seeing?

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Where are you getting that live feed from?

Add this line to your radars.gis file in GR2Analyst (edit in Notepad)...maintaining the same format as the others. The IA State live feed is updating with it (http://mesonet-nexra...edu/level2/raw/)

koun koun 35.236 -97.462 370 1 OK Norman Testbed1

The WDSS website has the data as well but if you have/use AE you'll obviously be able to zoom/pan etc at full resolution and all tilts.

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Add this line to your radars.gis file in GR2Analyst (edit in Notepad)...maintaining the same format as the others. The IA State live feed is updating with it (http://mesonet-nexra...edu/level2/raw/)

koun koun 35.236 -97.462 370 1 OK Norman Testbed1

The WDSS website has the data as well but if you have/use AE you'll obviously be able to zoom/pan etc at full resolution

Yea I already have the KOUN testbed in my .gis file but when I click on it. It says "live data from this radar is currently unavailable".

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Yea I already have the KOUN testbed in my .gis file but when I click on it. It says "live data from this radar is currently unavailable".

Be sure you're not checking the KCRI radar (Testbed2)...its easy to choose that one over the KOUN because they're almost on top of each other...the KCRI is NOT updating live.

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