MD 1706 CONCERNING SEVERE POTENTIAL…WATCH LIKELY FOR PORTIONS OF EASTERN OKLAHOMA AND SOUTHEASTERN KANSAS
Mesoscale Discussion 1706 NWS Storm Prediction Center Norman OK 0220 PM CDT Mon Oct 09 2017 Areas affected...Portions of eastern Oklahoma and southeastern Kansas Concerning...Severe potential...Watch likely Valid 091920Z - 092115Z Probability of Watch Issuance...95 percent SUMMARY...Isolated to scattered severe storms are expected to develop over the next few hours. These storms will persist through the mid/late evening hours, with an attendant threat of large hail, damaging winds, and perhaps a tornado or two. Watch issuance is likely within the next 1-2 hours. DISCUSSION...Visible satellite this afternoon depicts two areas of increasing convective potential -- one stretching across east-central Oklahoma ahead of a cold front and another over southeast Kansas ahead of a weak surface low. Large-scale mid/upper ascent likely remains somewhat weak, with the primary shortwave trough situated over the Four Corners region. However, ongoing heating, modest warm-air advection ahead of the low, and convergence along the cold front will likely be sufficient to overcome any remaining inhibition across the region. While mid-level lapse rates are not particularly steep (generally 7 C/km or less) across eastern OK and southeast KS, rich boundary-layer moisture and sufficient heating have yielded around 1000-2000 J/kg of MLCAPE. Meanwhile, increasing 500mb southwesterlies atop low-level south/southeasterly winds are offering ample effective shear for updraft organization/rotation. In turn, more robust cores will be capable of large hail and damaging winds through this evening. A tornado or two may also be possible early this evening, considering the backed surface flow across far southeast KS and eastern OK. However, the advance of the cold front and loss of favorable surface-based buoyancy with eastward extent will likely keep the tornado threat rather confined in space/time. Regardless, watch issuance is likely within the next 1-2 hours. ..Picca/Grams.. 10/09/2017 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...SGF...TSA...TOP...ICT...OUN... LAT...LON 34989651 35449696 36149708 37089705 37329717 37949676 38099597 37919542 37289506 36149472 35079498 34759595 34989651
from SPC Mesoscale Discussions http://bit.ly/2yTtDsD
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