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Severe Weather October 10th-12th 2021


Sydney Claridge
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One interesting thing is; it seems that one concern going into this event based off some of the forecast discussions was that storm motion was expected to be quite fast (50 MPH or more). However, these supercells have only been moving 20-25 MPH according to the warning statements. Obviously a good thing from a public/chaser safety standpoint especially with it being after dark, but I'm curious as to the cause of the discrepancy. Usually in my experience, when forecast storm speeds bust, they bust low (storms move faster than anticipated).

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Possible LEWP-embedded tornado coming up US 56 toward Copeland, Montezuma, Ensign, and possibly Dodge City, KS. This event striking or at least threatening all the towns I hit on my complete bust of a two-day chase trip this past May (I sat in Clinton, OK for a few hours the afternoon of the 27th, then eventually made my way to Watonga).

 

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Cell in NW Oklahoma is definitely on the cool side of the warm front and will probably dissipate. The cell west of Chickasha appears to be near or just NE of the warm front and will likely weaken over time, keeping OKC out of the main threat. It may pose an isolated tornado threat for another hour or two  

The focus shifts west to the MDT risk zone where supercell structures are embedded within a squall line. The best moisture is south of the KS/OK border, but strong low-level shear may support some continued tornado risk in southwestern Kansas, despite a stable near-surface layer. 

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13 minutes ago, nwohweather said:

Basically a Cat 1 hurricane in West Kansas right now. Some serious wind up and down that whole line

Pretty impressive low level wind profiles. LLJ in the 50-60kt range at 850mb with 0-1km SRH of 400-600 m2/s2. The line is even breaking into semi discrete storms in the eastern Texas panhandle, although deep shear vectors become increasingly parallel to the cold front with southward extent. 

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img-5.png

 

Mesoscale Precipitation Discussion 1082
NWS Weather Prediction Center College Park MD
1231 PM EDT Wed Oct 13 2021

Areas affected...southwest into west-central Texas

Concerning...Heavy rainfall...Flash flooding possible

Valid 131631Z - 132231Z

Summary...Onset of a long-duration flash flood threat is underway
across the discussion area.

Discussion...Latest observations and objective analyses indicate a
nearly surface boundary extending from near 6R6 (near the Big Bend
region of Texas) east-northeastward to near the Dallas/Fort Worth
Metro area.  Along and southeast of the front, abundantly moist
and unstable air was supporting scattered showers and
thunderstorms near the front that were increasing in coverage and
intensity this morning.  Flow aloft was southwesterly - generally
parallel to the front - which was already allowing for some
training especially near the convective band about 70 WSW of SJT.
Areas of 1"/hr rates were already noted, which is not particularly
surprising given 1.5-1.9 inch PW values along and ahead of the
front.

Over the next 6 hours (and potentially beyond), models depict a
gradual expansion of convective coverage primarily due to weak
confluence/convergence along and ahead of the front.  The approach
of moisture/lift associated with Tropical Cyclone Pam along the
western coast of Mexico will also contribute to expanded
convective coverage over time as well.  FFG thresholds are
generally in the 2-3"/hr range across most of the discussion area
(slightly lower near the Austin/San Antonio corridor), suggesting
that the greatest flash flood threat will be tied to areas that
can experience training and/or persistence of heavy rainfall in
the near term.

Cook

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

ATTN...RFC...WGRFC...NWC...

LAT...LON   32689805 32479765 31719781 30789875 29679955
            29130038 29300089 29560173 29570234 29690269
            30450231 31190151 32489919
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