Extreme Heat and Tropical Storm Bertha Impacts

Dangerous heat will expand from the Gulf Coast into the Southern Plains and Desert Southwest through week's end. Additional extreme heat impacting the Pacific Northwest will shift to the northern Plains by the weekend. Tropical Storm Bertha is expected to continue to impact portions of the northwestern Gulf Coast from south central Louisiana to the upper Texas coast today. Read More >

Automatically generated image showing areas of 0-3 km storm relative helicity.


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Helicity (0-3 Km)

This is the 0-3 km (0-10,000 Ft. AGL) storm relative helicity which is a measure of the amount of wind shear available from the ground to roughly 700 MB. Values greater than 250 m**2/s**2 suggest an increased threat of tornadoes, but high values with this index do not necessarily suggest that the environment is supportive of supercell structures (look at 0-6 km shear). Larger values are generally better, but there are no clear "boundaries" between non-tornadic and significant tornadic supercells. Negative values suggest that anti-cylonic (left moving) supercells will dominate.

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Extreme Heat and Tropical Storm Bertha Impacts

Convective Parameters - Helicity 0-3km