SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0653 PM CST Sat Mar 08 2025 Valid 090100Z - 091200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF THE SABINE AND LOWER MISSISSIPPI VALLEYS EASTWARD INTO THE CENTRAL AND EASTERN GULF COAST... ...SUMMARY... Isolated severe storms will be possible tonight from parts of the southeast Texas eastward into the Gulf Coast states. ...Sabine and Lower Mississippi Valleys/Central and Eastern Gulf Coast Vicinity... The latest water vapor imagery has a mid-level low over the southern High Plains with southwest flow from southwest Texas into the Ark-La-Tex. An 80 to 100 knot mid-level jet is analyzed by the RAP over central Texas. A cluster of storms has developed near the exit region of this feature in southeast Texas. The storms are located just ahead of a cold front, along inverted trough in the Texas Coastal Plain, where surface dewpoints are mostly in the 65 to 70 F range. A small pocket of moderate instability, with MLCAPE in the 1000 to 1500 J/kg range, is analyzed by the RAP in the vicinity of Houston. The ongoing storms are located along the northern edge of this stronger instability. The WSR-88D VWP near Houston has 0-6 km shear around 70 knots. The instability and shear will be sufficient for a severe threat this evening. The storms should eventually affect parts of the lower Mississippi Valley later this evening into the overnight. Further to the east, a small area of thunderstorms has developed near the southeastern most point of Louisiana, with other storms located eastward into the northeastern Gulf. These storms will continue moving northeastward into the central and eastern Gulf Coast tonight. Low-level moisture advection, associated with the approaching mid-level system, will contribute to a gradual increase in instability across the central and eastern Gulf Coast. For this reason, a marginal severe threat is expected to develop tonight from southern Mississippi eastward into southern Alabama, northern Florida and far southern Georgia. The primary threat will be for isolated severe gusts. A conditional threat for a brief tornado is also expected. ..Broyles.. 03/09/2025