MD 0139 CONCERNING SEVERE POTENTIAL…WATCH UNLIKELY FOR SOUTH-CENTRAL/SOUTHEAST OK…NORTH-CENTRAL/NORTHEAST TX
Mesoscale Discussion 0139 NWS Storm Prediction Center Norman OK 0108 AM CDT Mon Mar 19 2018 Areas affected...South-Central/Southeast OK...North-Central/Northeast TX Concerning...Severe potential...Watch unlikely Valid 190608Z - 190815Z Probability of Watch Issuance...20 percent SUMMARY...Large hail is possible with the rapidly developing storms across south-central/southeast OK and north-central/northeast TX. Limited temporal duration and areal extent of the threat is expected to preclude the need for a watch. DISCUSSION...Recent regional radar imagery has shown increased reflectivity across south-central OK and adjacent far north-central TX over the past half hour. Cooling cloud-tops have also been noted within GOES-16 IR imagery. This development appears to be on the leading edge of a low-amplitude, fast-moving shortwave trough rotating around the parent upper system over the TX Panhandle. Adding to the forcing for ascent is the approaching Pacific cold front (analyzed from west of OKC southward to about 50 mi east-southeast of SPS to southwestward through the TX Hill Country) and subtle pre-frontal troughing. Given the elevated instability (sampled well by the 00Z FWD sounding) and strong vertical shear, these storms are expected to rapidly strengthen and pose a hail risk for portions of south-central/southeast OK and north-central/northeast TX. The anticipated short duration (i.e. about 3 hours) and limited areal extent is expected to preclude the need for a watch. ..Mosier/Edwards.. 03/19/2018 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...SHV...TSA...FWD...OUN... LAT...LON 34619700 35059674 35229612 35099541 34679515 33879529 33239560 32889662 33299738 34619700
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