Friday 19th July 2019 – Minnesota (Moderate Risk)

After a travel day on Thursday we were in a good position in Sioux Falls and upon waking the SPC had issued a rare Moderate Risk with a 15% Hatched Risk for Tornadoes with a Strong Tornado Likely. One major problem today was going to be the EML with a fairly substantial capping inversion at 700mb. A deep area of Low Pressure sitting across Central South Dakota would move NE Into Central Minnesota by 00z with a Modified Outflow Boundary from this Low draped west to east across Minnesota into Wisconsin.

We got into position for about 3pm and located the bubbling boundary, Temps were 92f with an 80f dewpoint, Elevated Supercells were ongoing north of the boundary with strong NE Inflow into these storms around the St Cloud to Alexandria area, these storms would have less chance of producing a Tornado so we sat and waited and waited and waited. Around 5pm it became clear we were staring a Cap Bust in the face.

We headed to Marshall for the night licking our wounds but had the payoff of elevated Storms affecting the Hotel very early the next morning which produced some lovely Asperatus Clouds and a nice Roll Cloud.


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