Impact of Parameterized Boundary Layer Structure on Tropical Cyclone Rapid Intensification Forecasts in HWRF

Zhang, Jun A.; Rogers, Robert F.; Tallapragada, Vijay

doi:10.1175/mwr-d-16-0129.1

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Impact of Parameterized Boundary Layer Structure on Tropical Cyclone Rapid Intensification Forecasts in HWRF

2017
By Zhang, Jun A. ; Rogers, Robert F. ; Tallapragada, Vijay
Source: Monthly Weather Review, 145(4), 1413-1426.

[PDF-2.45 MB]

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Journal Title:

Monthly Weather Review
Personal Author:

Zhang, Jun A. ; Rogers, Robert F. ; Tallapragada, Vijay

Zhang, Jun A. ; Rogers, Robert F. ; Tallapragada, Vijay Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; EMC (Environmental Modelling Center) ; NWS (National Weather Service) ; AOML (Atlantic Oceanographic and Meteorological Laboratory) ; CIMAS (Cooperative Institute for Marine and Atmospheric Studies)

OAR (Oceanic and Atmospheric Research) ; EMC (Environmental Modelling Center) ; NWS (National Weather Service) ; AOML (Atlantic Oceanographic and Meteorological Laboratory) ; CIMAS (Cooperative Institute for Marine and Atmospheric Studies) Less -
Description:

This study evaluates the impact of the modification of the vertical eddy diffusivity (K-m) in the boundary layer parameterization of the Hurricane Weather Research and Forecasting (HWRF) Model on forecasts of tropical cyclone (TC) rapid intensification (RI). Composites of HWRF forecasts of Hurricanes Earl (2010) and Karl (2010) were compared for two versions of the planetary boundary layer (PBL) scheme in HWRF. The results show that using a smaller value of K-m, in better agreement with observations, improves RI forecasts. The composite-mean, inner-core structures for the two sets of runs at the time of RI onset are compared with observational, theoretical, and modeling studies of RI to determine why the runs with reduced K-m are more likely to undergo RI. It is found that the forecasts with reduced K-m at the RI onset have a shallower boundary layer with stronger inflow, more unstable near-surface air outside the eyewall, stronger and deeper updrafts in regions farther inward from the radius of maximum wind (RMW), and stronger boundary layer convergence closer to the storm center, although the mean storm intensity (as measured by the 10-m winds) is similar for the two groups. Finally, it is found that the departure of the maximumtangential wind from the gradient wind at the eyewall, and the inward advection of angular momentum outside the eyewall, is much larger in the forecasts with reduced K-m. This study emphasizes the important role of the boundary layer structure and dynamics in TC intensity change, supporting recent studies emphasizing boundary layer spinup mechanism, and recommends further improvement to the HWRF PBL physics.
Source:

Monthly Weather Review, 145(4), 1413-1426.
DOI:

https://doi.org/10.1175/mwr-d-16-0129.1
Document Type:

Journal Article
Funding:

Grant no. NA14NWS4680028 ; Grant no. NA14NWS4680030 ; Grant no. NA14OAR4830172

Grant no. NA14NWS4680028 ; Grant no. NA14NWS4680030 ; Grant no. NA14OAR4830172 Less -
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urn:sha256:7c05bc04e05a6b42dd9ef90eedd0bf831fb25ed9b4888be877d555d49db699bb
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Impact of Parameterized Boundary Layer Structure on Tropical Cyclone Rapid Intensification Forecasts in HWRF

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