Hurricane Research Division of AOML/NOAA

Source: https://www.aoml.noaa.gov/hrd/HFP2001/erin.html

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Hurricane Erin (10 September 2001)

The goal of this mission was to obtain coordinated multi-level in
situ and remotely sensed observations to support the Surveillance
objectives of CAMEX-4 under the USWRP. We hoped to sample the
storm at two altitudes in the core with N42RF and the ER-2 to
focus our remote sensing and in situ precipitation measurement
capabilities on any major precipitation feature. Meanwhile the
DC-8 was sampling the near environment of the storm with GPS sondes
and the LASE to obtain environmental wind and thermodynamic
fields for numerical model initialization

A very good mission! Good coordination with the ER-2 resulting in
an excellent center drop from 65,000 ft ( a first!). Completed
the pattern as briefed with a few wrinkles to maintain coordination
with the ER-2 and flight safety. In the core there was an
interesting variations in the radius of maximum wind at the surface
and flight level were found on the north and east side of the
storm. The maximum SFMR surface winds were at much smaller ra dii
(8-12 km) than the maximum 14,000 ft winds. This difference
was evident in the GPS-sondes in the eyewall. We also found two
low-level circulation centers evident in the low-level cloud field
(see Figure). The surface wind and pressure center appeared to
be in the circulation closest to the west eyewall. There was only
one apparent wind and pressure center at 14,000 ft, which was
closer to the other surface cloud circulation. CN measurements
indicated that the eye was relatively dirty with concentrations
~2000 l-1.

Storm/ Date
Aircraft (Duration)
Altitude
Experiment/ Pattern
Comments (expendables)

Erin

10 September
N42RF (8.9 h) mission
summary(636 Kb)
one
minute listing

GPS dropsondes
DC-8 (9 h) mission summary

GPS dropsondes
ER-2 (8 h)
WC-130

14 kft

37-39 kft
65 kft

    3-plane SurveillanceExperiment.
    N42RF, ER-2 within 100 nm radius in core. DC-8 
    does star pattern between 240-300 nm of center.

                     
                    
                      Erin Hurricane during mission.
                        (18 AXBT, 19 GPS sondes) 
                      N42RF recovers in Providence, RI to extend on station 
                        time. Returns to MacDill AFB on 12 September.

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