Identification

Title

Case Studies on Convective Storms / Case Study 10, 22 July 1975: Mature Storm Study / a Conceptual Model Synthesized From Microphysical and Dynamic Observations of a Multicell Thunderstorm

Abstract

This Technical Note is a case study of one of the storms examined in the 1975 field season of the National Hail Research Experiment, during which the two primary observing instruments were the CP-2 10 cm radar and the South Dakota School of Mines and Technology armored T-28 aircraft that had just been instrumented with new cloud physics probes. A complex multi-cell thunderstorm was penetrated with the armored T-28 aircraft. The T-28 carried a comprehensive suit of instruments to measure specific, critical parameters in the thunderstorm. The instrumentation package included a foil impactor for measuring particles larger than 1 mm, a Particle Measuring Systems (PMS) two-dimensional cloud probe for measuring 25 lim to 1 mm diameter particles, and a PMS Forward Scattering Spectrometer Probe (FSSP) for measuring droplets 2-30 lpm diameter. The National Hail Research Experiment's (NHRE) CP-2 radar was located in a prime position to acquire optimum data on this storm. A Doppler processor was integrated into the CP-2 system. The location and motion of the storm were fortuitous in that the storm moved almost directly away from the radar, and 65ï¿½ï¿½ to the right of the environmental winds. The data set is examined in detail. The key to understanding the data lies in dividing the storm into its component cells (parts) and examining the data in the context of cell lifetimes. Thirty-nine cells were delineated as part of the storm which lasted over two hours. Six of these cells were penetrated by the T-28, two of them twice. A conceptual model is developed by considering the total interactive series of cells and the detailed measurements within specific cells relative to the total radar study and the detailed radar analysis of each cell. Using the analyzed data, cross sections are developed to show the spatial and temporal parameter evolution through the life of a typical cell in a multicell storm. Evidence exists for the recirculation of ice crystals in areas of subdued convection and downdrafts to allow time for growth of cloud elements to hail embryo sizes followed by subsequent diffusion into updraft areas where the ingredients for rapid growth of these embryos to hail sizes exist.

Resource type

document

Resource locator

Unique resource identifier

code

http://n2t.net/ark:/85065/d7d50mbh

codeSpace

Dataset language

eng

Spatial reference system

code identifying the spatial reference system

Classification of spatial data and services

Topic category

geoscientificInformation

Keywords

Keyword set

keyword value

Text

originating controlled vocabulary

title

Resource Type

reference date

date type

publication

effective date

2016-01-01T00:00:00Z

Keyword set

keyword value

EARTH SCIENCE > ATMOSPHERE > WEATHER EVENTS > HAIL STORMS

EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC WINDS > WIND DYNAMICS

EARTH SCIENCE > ATMOSPHERE > CLOUDS > CLOUD MICROPHYSICS

EARTH SCIENCE > ATMOSPHERE > CLOUDS > CONVECTIVE CLOUDS/SYSTEMS (OBSERVED/ANALYZED) > PRECIPITATING CONVECTIVE CLOUD SYSTEMS

originating controlled vocabulary

title

U.S. National Aeronautics and Space Administration Global Change Master Directory

reference date

date type

revision

effective date

2021-09-17

Geographic location

West bounding longitude

East bounding longitude

North bounding latitude

South bounding latitude

Temporal reference

Temporal extent

Begin position

End position

Dataset reference date

date type

publication

effective date

1981-01-01T00:00:00Z

Frequency of update

Quality and validity

Lineage

Conformity

Data format

name of format

version of format

Constraints related to access and use

Constraint set

Use constraints

Limitations on public access

None

Responsible organisations

Responsible party

contact position

OpenSky Support

organisation name

UCAR/NCAR - Library

full postal address

PO Box 3000

Boulder

80307-3000

email address

opensky@ucar.edu

web address

http://opensky.ucar.edu/

name: homepage

responsible party role

pointOfContact

Metadata on metadata

Metadata point of contact

contact position

OpenSky Support

organisation name

UCAR/NCAR - Library

full postal address

PO Box 3000

Boulder

80307-3000

email address

opensky@ucar.edu

web address

http://opensky.ucar.edu/

name: homepage

responsible party role

pointOfContact

Metadata date

2023-08-18T18:04:10.331959

Metadata language

eng; USA