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From | To | Subject | Date/Time | |||
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Mike Powell | All | DAY2 ENHANCED AR/LA/TX/TN |
April 2, 2025 2:14 PM * |
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ACUS02 KWNS 021731 SWODY2 SPC AC 021730 Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1230 PM CDT Wed Apr 02 2025 Valid 031200Z - 041200Z ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS FROM THE ARKLATEX TO WESTERN TENNESSEE... ...SUMMARY... Several clusters of strong to severe storms are expected along a broad frontal zone from the Southern Plains, Mid Mississippi Valley to the Ohio/Tennessee Valleys and the Mid Atlantic. Damaging gusts and hail are the primary risks. The greatest large hail and tornado threat (potentially strong) exists from the ArkLaTex to western Tennessee. ...Synopsis... An elongated frontal zone will provide a focus for a severe weather threat on Thursday from West Texas to the Mid-Atlantic. Ongoing convection of varying intensity will likely be ongoing with its outflow modulating the composite frontal location along this zone. As a mid-level trough amplifies across the southwestern CONUS, mid-level ridging will strengthen across the eastern CONUS with height rises across much of the warm sector. A low-level jet will intensify through the Lower to Mid-Mississippi Valley through the day and should provide enough synoptic ascent for scattered severe storms Thursday afternoon and evening from the ArkLatex to western Tennessee. ...West Texas to North Texas... Ongoing strong to severe storms are possible Thursday morning along and south of the Red River from Northwest Texas to north-central Texas. MUCAPE in excess of 2000 J/kg and very strong effective shear (80+ knots) will support the potential for supercells capable of large hail and some severe wind gusts. This threat will wane by mid day as the low-level jet veers and weakens across North Texas and southern Oklahoma. Late Thursday night and into Friday morning, the low-level jet is expected to strengthen across central Texas as the larger-scale mid-level trough starts to advance eastward with a lead impulse likely to move across West Texas between 06Z and 12Z. RAP forecast soundings show very steep mid-level lapse rates and MUCAPE in excess of 2500 J/kg across portions of northwest and West Texas as the synoptic scale forcing strengthens. Therefore, several supercells capable of large to very large hail and severe wind gusts are expected between 06Z and 12Z across portions of West Texas and Northwest Texas. ...ArkLatex to Western Tennessee... An outflow boundary from Day 1/Wednesday convection will likely be located somewhere near the LA/AR border at 12Z Thursday. This boundary will start to mix north into southern Arkansas and northeast Texas as a warm front through the day. A strengthening low-level jet, particularly after 18Z, should provide ample forcing for supercell development in the vicinity of this warm front during the afternoon/evening hours. Strong to potentially extreme instability is anticipated south of this boundary amid a rich theta-e airmass. Any of these supercells will have the potential for large to potentially very large hail. Any supercells which can remain along or south of the warm front will pose a threat for all severe hazards including the potential for strong tornadoes. However, this threat is conditional on surface-based supercell residence time. Farther northeast into western Tennessee, northward recovery of the warm front remains more uncertain as the cold pool/convection from day 1 may persist through the morning. However, if the warm front can mix north into western Tennessee, higher tornado probabilities could be needed at a later time. ...Kentucky to the Mid-Atlantic... Day 1 convection and cloud cover will significantly inhibit severe weather potential on Day 2 along the frontal zone from Kentucky to the Mid-Atlantic. Trimmed probabilities farther south near the Ohio River based on latest forecast front location. Otherwise, a moist airmass will remain in place along and south of the front/remnant outflow. Therefore, only minimal heating will be needed for some storms to develop which could be supercellular given 45 to 55 knots of effective shear along the frontal zone. Overall height rises should keep stronger storm coverage isolated to potentially scattered. Some damaging wind/large hail, and perhaps a tornado threat may exist within this corridor on Thursday, but the exact locations of this threat remains uncertain at this time. ..Bentley.. 04/02/2025 $$ --- SBBSecho 3.20-Linux * Origin: capitolcityonline.net * Telnet/SSH:2022/HTTP (618:250/1) |
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