Jump to content
  • Member Statistics

    17,601
    Total Members
    7,904
    Most Online
    ArlyDude
    Newest Member
    ArlyDude
    Joined

Significant severe weather threats 4/8-10


OKpowdah

Recommended Posts

  • Replies 474
  • Created
  • Last Reply
MESOSCALE DISCUSSION 0411

NWS STORM PREDICTION CENTER NORMAN OK

0214 PM CDT TUE APR 09 2013

 

AREAS AFFECTED...NWRN TX INTO MUCH OF CNTRL OK

 

CONCERNING...SEVERE POTENTIAL...WATCH LIKELY 

 

VALID 091914Z - 092115Z

 

PROBABILITY OF WATCH ISSUANCE...80 PERCENT

 

SUMMARY...SCATTERED STORMS WILL EVENTUALLY FORM AND LARGE HAIL WILL

BE POSSIBLE. A WATCH MAY BE REQUIRED BEFORE 21Z.

 

DISCUSSION...AN ARCTIC FRONT CONTINUES TO SURGE SWD ACROSS TX INTO

WRN OK. ALONG THIS FRONT...OCCASIONAL CU HAVE RAPIDLY DEVELOPED AND

DISSIPATED AS SOURCE AIR GETS UNDERCUT. AHEAD OF THE FRONT...THE AIR

MASS HAS BEEN CAPPED.

 

HOWEVER...LATEST VISIBLE IMAGERY INDICATES CHANGING CHARACTER TO THE

CU FIELDS FROM NWRN TX INTO WRN OK NEAR THE FRONT. A DEEPER GROUPING

OF TCU HAS FORMED ON THE NOSE OF THE HOTTER AIR ACROSS NWRN

TX...NEAR A WEAK SURFACE LOW AND DRYLINE/COLD FRONT INTERSECTION

WHERE CAPPING IS NEGLIGIBLE. MORE RECENTLY...STABLE WAVE CLOUDS HAVE

MIXED ACROSS W CNTRL AND SWRN OK...SUGGESTING THE CAP IS BEING

LIFTED THERE AS WELL. WITH ADDITIONAL SURFACE HEATING AHEAD OF THE

FRONT...AND COOLING IN THE CAPPING LAYER...STORM INITIATION WILL

BECOME INCREASINGLY LIKELY OVER THE NEXT COUPLE HOURS.

 

ONE POTENTIAL PROBLEM IN REGARD TO LONG LIVED SEVERE CONVECTION IS

THE TENDENCY FOR THE FRONT TO UNDERCUT DEVELOPMENT OCCURRING ALONG

IT...ORPHANING THE INCIPIENT UPDRAFTS. THEREFORE...MUCH OF THE

CONVECTION MAY END UP BEING ELEVATED BEHIND THE FRONT.
Link to comment
Share on other sites

Actually, it's freezing rain.  There is a nasty ice storm going on in a narrow strip.

 

Still tearing along. I can only imagine what it's like to be under a storm dropping up to quarter size hail with heavy freezing rain going on.

Link to comment
Share on other sites

18Z OUN sounding:

 

OUN.gif

 

really good shear from the sfc to about 800mb but that veer-back-veer profile just isn't going to cut it. Looping vis sat you can see that any cu that try to get going get quickly undercut by the cold air at the sfc. Anything that develops will more than likely be elevated.

Link to comment
Share on other sites

00z ECMWF was superior from last night...with the front surging much farther S much faster and subsequently shunting any dryline activity. Even if the NAM/GFS did verify, the window was small with not so impressive kinematics immediately east of the dryline...which had been the case for multiple days as the models showed weak pressure falls/low level wind fields with this anafront setup. Was a bit surprised when SPC went Mod. I think it was Broyles who issued the forecast. He does tend to be a little optimistic at times under certain circumstances.

Link to comment
Share on other sites

00z ECMWF was superior from last night...with the front surging much farther S and subsequently shunting any dryline activity. Even if the NAM/GFS did verify, the window was small with not so impressive kinematics immediately east of the dryline...which had been the case for multiple days as the models showed weak pressure falls with this anafront setup. Was a bit surprised when SPC went Mod. I think it was Broyles who issued the forecast...and he tends to be a little optimistic at times.

 

Bingo

Link to comment
Share on other sites

00z ECMWF was superior from last night...with the front surging much farther S much faster and subsequently shunting any dryline activity. Even if the NAM/GFS did verify, the window was small with not so impressive kinematics immediately east of the dryline...which had been the case for multiple days as the models showed weak pressure falls/low level wind fields with this anafront setup. Was a bit surprised when SPC went Mod. I think it was Broyles who issued the forecast. He does tend to be a little optimistic at times under certain circumstances.

 

That was the overwhelming consensus in the NWC today

Link to comment
Share on other sites

Archived

This topic is now archived and is closed to further replies.

  • Recently Browsing   0 members

    • No registered users viewing this page.

×
×
  • Create New...