National Weather Service Surveyors Detail EF-1 and EF-2 Tornado Damage in NW Harris County

Tornado Damage Assessment Methodology

• 🔍 Survey teams from the National Weather Service meticulously assess tornado damage to determine intensity ratings.
• 🏠 On Luetta in the Spring area, a house with a large section of its roof lifted off indicated EF2 damage, with estimated winds around 115 mph.
• 📊 Surface area of roofs and the percentage of shingle damage are key indicators, alongside the impact on trees.

Tree Damage Analysis

• 🌳 The type of tree damaged provides insight into wind speed; softwood trees like pines snap more easily than hardy hardwood trees like live oaks.
• ⚠️ Uprooted large trees and snapped trunks are significant indicators of tornado intensity.

Preliminary Tornado Findings

• ⚡ Two tornadoes were preliminarily identified from yesterday's storms.
• 📈 The first tornado had a path of approximately 2.6 miles, with peak intensity estimated as a high-end EF1 with winds around 100-105 mph.
• 📍 The second tornado, on the ground for about 3.8 miles, showed EF0 to EF1 damage for most of its path, but EF2 damage was found in the Northwest Memorial subdivision.

Factors Influencing Damage Ratings

• 🏘️ Surveyors gather information through interviews and by assessing the structural integrity of homes.
• 🏗️ Whether a structure was moved off its foundation and if it was bolted to the foundation are critical factors in estimating wind speeds.