UW-SSEC/CIMSS PECAN Deployment 27

Crew: Olson, A. Wagner, Williams, Loveless

Author: Loveless

Date: 13 July 2015 (UTC)

Location: 42.6401, -92.0384 (Fairbank, IA)

Weather conditions: Hot and humid air mass over the upper midwest, ridge building over the central Plains. Amplifying shortwave helping force a potent MCS set to travel through the Upper Mississippi River Valley. 100+ knot jet at 200hPa along the northern edge of the ridge. SPC had a moderate risk out for eastern MN and western WI. Very high instability in the region, exceeding 6000 J/kg of CAPE in some places. Convection initiated up along the ND/MN border and organizing into an MCS around 0200 UTC.

Mission type: MCS

SPARC collecting data by 0200 UTC, terminated operations at 0730 UTC

Instrument status:

AERI - Good (cooler current running high)

HALO Lidar - Good

HSRL - Good

Surface Met. - Good

Radiosondes - 0200 0400 0500 0600 0700 UTC

Notes: SSEC/AOSS building was converted into a fixed site for tonight, HALO, HSRL operating on the roof. Madison in better position for MCS, SPARC in good bore position and decent data on LLJ into the MCS. Storms were still a good 220+ miles north of us when we got deployed at 0200 UTC. By 0400 UTC MCS was organized with a nice bowing segment and notable gust fronts forming. CI developed just northeast of SPARC, right over TWOLF, right during our 0400UTC launch. Lots of CI throughout the night ahead of the main line across southern WI. MSN had thunder from a cell over the city. Very good CI dataset, mystery as to why the MCS weakened so much in such a high instability environment.