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# Comparing initial large-scale fields from two HWRF runs with GFS analysis PowerPoint PPT Presentation

Comparing initial large-scale fields from two HWRF runs with GFS analysis. --Two HWRF configurations ❶ H14C : GSI is used on Domain 1 ❷ T14C: GSI is not used Domain 1. --GFS analysis 0.5X0.5 grib2 data are used. H14C vs T14C. From Mingjing Tong. Procedure

Comparing initial large-scale fields from two HWRF runs with GFS analysis

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Comparing initial large-scale fields from two HWRF runs with GFS analysis

--Two HWRF configurations

❶ H14C : GSI is used on Domain 1

❷ T14C: GSI is not used Domain 1

--GFS analysis 0.5X0.5 grib2 data are used

H14C vs T14C

From Mingjing Tong

Procedure

Get data of both HWRF runs from hpss for all cycles in EPAC and ATL in Aug of 2012 and 2013. Total 447 cycles.

2. Use “copygb” to map HWRF domain 1 to the same grid of GFS data (0.5X0.5),

hr_grid="255 0 720 361 90000 000000 136 -90000 -500 500 500 0"

3. Calculate bias ( mean differences (HWRF – GFS), RMS difference for a given point.

SPFH not available in HWRF but available in GFS. Calculated both for consistent comparison.

Distribution of the number of available data points

# of Cycles in Aug 2012: 296 = 77E + 219L

# of Cycles in Aug 2013: 151 = 108E + 43L

Total: 447

HWRF analysis vs GFS analysis

• HGT (850mb, 500mb)

• TMP (850mb, 500mb)

• RH (850mb, 500mb)

• SPFH (850mb, 500mb)

• Wind speed (850mb, 500mb)

• U (850mb, 500mb)

• V (850mb, 500mb)

850mb

H14C – GFS

T14C – GFS

BIAS

RMS

500mb

H14C - GFS

T14C - GFS

BIAS

RMS

850mb

H14C - GFS

T14C - GFS

BIAS

RMS

500mb

H14C - GFS

T14C - GFS

BIAS

RMS

850mb

H14C - GFS

T14C - GFS

BIAS

RMS

500mb

H14C - GFS

T14C - GFS

BIAS

RMS

850mb

H14C - GFS

T14C - GFS

BIAS

RMS

500mb

H14C - GFS

T14C - GFS

BIAS

RMS

850mb

H14C - GFS

T14C - GFS

BIAS

RMS

500mb

H14C - GFS

T14C - GFS

BIAS

RMS

850mb

H14C - GFS

T14C - GFS

BIAS

RMS

500mb

H14C - GFS

T14C - GFS

BIAS

RMS

850mb

H14C - GFS

T14C - GFS

BIAS

RMS

500mb

H14C - GFS

T14C - GFS

BIAS

RMS

Why wind speed close, but wind components different ?

- Select one cycle to take a closer look

T14C minus GFS analysis

Storm 04L 2013

2013080118 cycle

850mb

Scalars

TMP

HGT

RH

Wind speed

Wind

Large differences appear on the left part of domain.

V

U

HWRF

GFS analysis

Implication:

POST different or one has error

WRFOUT netcdf

HWRF F72 vs GFS analysis

• HGT (850mb)

• TMP

• RH

• SPFH

• Wind speed

• U

• V

850mb

H14C - GFS

T14C - GFS

BIAS

RMS

850mb

H14C - GFS

T14C - GFS

BIAS

RMS

850mb

H14C - GFS

T14C - GFS

BIAS

RMS

850mb

H14C - GFS

T14C - GFS

BIAS

RMS

850mb

H14C - GFS

T14C - GFS

BIAS

RMS

850mb

H14C - GFS

T14C - GFS

BIAS

RMS

850mb

H14C - GFS

T14C - GFS

BIAS

RMS

HWRF F72 vs GFS F72

• HGT (850mb)

• TMP

• RH

• SPFH

• Wind Speed

• U

• V

850mb

H14C - GFS

T14C - GFS

BIAS

RMS

850mb

H14C - GFS

T14C - GFS

BIAS

RMS

850mb

H14C - GFS

T14C - GFS

BIAS

RMS

850mb

H14C - GFS

T14C - GFS

BIAS

RMS

850mb

H14C - GFS

T14C - GFS

BIAS

RMS

850mb

H14C - GFS

T14C - GFS

BIAS

RMS

850mb

H14C - GFS

T14C - GFS

BIAS

RMS

Summary

1. HWRF analysis vs GFS analysis

T14C (without GSI) is better than H14C (with GSI) in terms of scalar fields (HGT, TMP, RH, SPFH). U/V differences are large for both. POST is very likely the error source.

2. HWRF F72 vs GFS analysis

Largest difference is temperature over land. Both colder/wetter than GFS analysis. Spatial patterns of other differences somewhat correlate with TMP. Difference between T14C and H14C after 72hr integration not obvious, with T14C slightly better.

3. HWRF F72 vs GFS F72

Very similar, except temperature over land. Seem that spatial patterns of other variables ~ tmp. Better LSM will make comparison better.

04L_2013080118 f00

RH

H14C minus GFS analysis

850mb

H14C

TMP

HGT

TMP

Speed

U

V