Greatest pressure drop measured in a tornado
The Tulia tornado
0.194 bar(s)
United States (Tulia)

On 21 April 2007, a series of tornadoes broke out across Texas, USA. One of these, an EF2, hit a mobile mesonet vehicle that was gathering scientific data in the town of Tulia. The instruments on the vehicle recorded a pressure drop inside the vortex of 194 millibars or 0.194 bars (5.72 inches of mercury).

The mobile mesonet vehicle sustained significant damage from the tornado encounter.