NOAA National Upper-air Station Performance Scores

Objective

The performance score was devloped as an aid to help evaluate NWS upper-air station performance nationwide and improve data availability, quantity, and quality.

Method

The following equation is used to rank station performance, which includes appropriate weighting factors:

Score = A/2 + B + C + D/2 - E/5 - F/5   where,

A = Percentage of monthly soundings arriving at NCEP within 3 hours after balloon release (by 14:00 or 02:00 UTC). This is based on NCEP and FMH#3 requirements. To score in this category, all coded messages (with or without data) must be received. This percentage is divided by 2.

B = Percentage of monthly soundings achieving the minimum 400 hPa pressure level requirement or higher.

C = Percentage of monthly soundings achieving 50 hPa or higher.

D = Percentage of monthly soundings achieving 20 hPa or higher. This percentage is divided by 2.

E = Percentage of monthly temperature levels between surface & 400 hPa rejected by NCEP.  This percentage is divided by 5.

F = Percentage of monthly wind levels between 400 and 100 hPa rejected by NCEP. This percentage is divided by 5.

NOTE: Starting with the August, 1999, data, element "A" above now includes soundings with AND without data.  Prior to this change, points were only given in this element if the coded messages contained data. Messages without data (i.e., no sounding taken) were not included in this element. This change will result in slightly higher average scores.

Elements B through F are compiled 6 hours or more after balloon release and before NCEP data deletions are applied to the soundings.  The maximum score a station can achieve with this equation is 300.  Histograms are available that show station performance for some of the above elements

Data Sources

Data used for generating the scores come from data quality reports provided by NCEP each month. 

Evaluation

It is important to note that a station's score does not solely reflect station staff performance. Factors such as equipment and communication failures, maintenance personnel performance, and support from NWS Regional office and Headquarters management, must also be taken into consideration when evaluating station scores.   Furthermore, many times a low score is the result of a system failure (e.g., lightning strike) beyond the control of station staff.  Upper-air station managers should use the scores as only one of several tools for assessing how well their station is performing.

***IMPORTANT***

(1) Stations must not under inflate balloons in an attempt to reach higher sounding termination heights and a higher monthly score.  Likewise, over inflation of the balloon must be avoided as this wastes gas and can lower balloon burst heights.  Routine under inflation and over inflation of the balloon is unacceptable.   Stations should review balloon ascension rate graphics based on the National Climatic Data Center (NCDC) archive and adjust the balloon gas amounts accordingly.  NWS stations should have no more than 5 soundings a month ascend outside the range of 275 to 350 meters/minute (average from surface to flight termination)

(2) Stations must not disseminate poor quality soundings that should have been terminated early or not even transmitted.   Dissemination of such soundings can erroneously increase the monthly score and is unacceptable for NWS operations.  Station staff should review the monthly NCEP Super-adiabatic Lapse Rate Report and other data to help identify poor quality soundings and take corrective action.

NWS upper-air station scores for the past 3 months and the 12 month running average.

300  =  Perfect Score.   Click here for trends in the National average and median score.

ID

Feb Score

ID

Mar Score

ID

Apr Score

ID

12 Month Avg

SJU

300.00

BOI

299.99

APX

300.00

MCG

298.31

BRO

299.97

ABR

299.91

MFR

299.98

ABQ

297.78

OAX

299.96

TBW

299.90

SGF

299.92

NKX

297.53

TFX

299.93

GGW

299.89

OAX

299.85

MFR

297.52

ILX

299.90

EPZ

299.87

DDC

299.61

BRO

297.40

AFG

299.60

DNR

299.85

ITO

299.49

GJT

297.36

DTX

299.11

TOP

299.85

TBW

299.17

BRW

297.34

LIH

299.08

YAP

299.59

SJU

299.17

ILX

297.17

OKX

299.01

APX

299.19

DTX

299.16

OHX

297.11

SHV

298.91

ILX

299.16

MCG

299.15

BOI

297.08

ITO

298.87

MCG

299.07

GYX

299.15

OTX

297.00

DRT

298.84

OHX

299.07

UIL

299.14

ITO

296.99

MCG

298.81

MFR

299.04

OTX

299.11

LKN

296.91

LKN

298.68

LBF

298.85

SLE

299.10

AFC

296.76

GJT

298.68

AFC

298.39

DNR

299.08

ILN

296.73

MFL

298.19

PBZ

298.37

OHX

299.06

TFX

296.70

MPX

298.19

OAX

298.36

ILX

299.01

ABR

296.66

ILN

298.18

BUF

298.36

SHV

298.95

EPZ

296.52

SGF

298.08

LCH

298.33

GJT

298.93

DRT

296.42

REV

298.03

RNK

298.11

LKN

298.76

INL

296.38

DNR

297.93

RIW

298.04

CHH

298.33

LIH

296.36

MAF

297.84

LKN

297.65

NKX

298.32

SLE

296.35

PBZ

297.32

YAK

297.58

MHX

298.26

TOP

296.34

BUF

297.27

ANN

297.58

BUF

298.25

REV

296.34

SLC

297.26

OTX

297.56

GUM

297.50

BUF

296.19

BRW

297.26

JAX

297.55

BRO

297.50

SGF

295.98

JAN

297.22

ABQ

297.51

ANN

297.50

MAF

295.87

OHX

297.21

MHX

297.46

INL

297.47

OAX

295.81

ABR

297.18

NKX

297.46

BIS

297.44

SJU

295.78

TBW

297.17

BIS

297.40

EPZ

297.39

SLC

295.72

DDC

297.16

MFL

296.75

GRB

296.67

APX

295.59

LBF

297.01

REV

296.74

AKN

296.67

OKX

295.56

EPZ

296.95

SLE

296.72

AFC

296.67

SHV

295.29

GYX

296.43

TFX

296.67

ABQ

296.65

TBW

295.26

AFC

296.43

BMX

296.66

UNR

296.61

AFG

295.24

CHH

296.42

MAF

296.57

GSO

296.61

LWX

295.16

ADQ

296.34

OAK

295.97

LIH

296.48

CHH

295.11

GUM

296.31

SJU

295.93

CRP

295.82

RNK

295.08

YAK

296.30

ILN

295.84

MPX

295.81

RIW

295.03

ABQ

296.17

TAE

295.66

ILN

295.80

LIX

294.98

OTX

295.54

GJT

295.56

KEY

295.79

MHX

294.98

APX

295.52

GYX

295.16

DRT

295.78

OTZ

294.84

CRP

295.49

GSO

295.16

JAX

295.76

DTX

294.80

OME

295.39

DVN

295.13

ABR

295.69

SNP

294.68

OAK

294.61

INL

295.13

OTZ

295.65

GSO

294.59

INL

294.61

BRO

295.12

LIX

295.65

ANN

294.52

AMA

294.49

LIX

295.11

MFL

295.00

UIL

294.52

CAR

293.73

OKX

295.10

TFX

294.99

MFL

294.32

LIX

293.69

SGF

295.08

BRW

294.97

CRP

294.28

BET

293.69

VEF

295.05

GGW

294.92

BMX

294.27

OUN

293.68

LWX

295.04

SLC

294.17

JAX

294.25

RNK

293.62

OUN

295.00

AFG

294.17

PBZ

294.23

BMX

293.60

LIH

294.96

REV

294.15

DNR

294.18

TOP

292.83

AMA

294.93

LBF

294.01

AMA

294.17

BOI

292.80

FFC

294.91

TOP

293.96

DDC

294.05

LZK

292.78

DTX

294.35

FGZ

293.52

TLH

293.91

JAX

292.76

BET

294.35

BET

293.33

BIS

293.82

SLE

291.94

GRB

294.33

BOI

293.33

LCH

293.79

LCH

291.92

JAN

293.80

SNP

292.50

GYX

293.79

AKN

291.90

DRT

293.55

LWX

292.45

GRB

293.58

ANN

291.89

BRW

293.49

TAE

292.38

MPX

293.38

CDB

291.01

FWD

292.54

LZK

292.38

JAN

293.23

MFR

290.98

FGZ

291.96

OUN

291.69

LZK

293.00

MAJ

290.97

ROR

291.94

ADQ

291.65

FWD

292.91

UIL

290.94

MPX

291.94

OAK

291.59

OAK

292.75

SNP

290.18

UIL

291.86

OKX

291.52

DVN

292.43

TAE

290.06

SHV

291.82

WAL

291.51

BET

292.27

FWD

289.86

AFG

291.80

LCH

291.51

GGW

291.81

RIW

289.75

KEY

291.13

ROR

290.83

CAR

291.26

PPG

289.29

CHH

291.11

DVN

290.80

FGZ

291.00

LWX

289.18

WAL

291.02

FFC

290.75

CDB

290.53

NKX

289.15

PPG

290.33

MAF

289.86

PPG

290.12

MHX

289.11

CRP

290.27

AMA

289.67

ADQ

290.05

BIS

287.45

LZK

290.24

VEF

289.08

CHS

290.01

FGZ

286.77

CHS

290.21

JAN

289.04

AKN

289.99

GSO

285.71

DDC

290.15

CDB

288.29

KEY

289.94

ALY

283.04

ITO

289.93

BMX

288.27

OUN

289.42

UNR

282.94

SNP

289.52

RIW

287.43

LBF

289.33

OTZ

282.06

AKN

289.52

PPG

285.70

FFC

288.33

WAL

281.25

GUM

288.71

PBZ

285.69

VEF

288.14

GRB

279.38

OTZ

288.52

TKK

285.00

WAL

288.08

TWC

279.14

CAR

287.90

OME

284.97

OME

285.83

PNI

277.45

ADQ

287.48

FWD

284.60

MAJ

285.69

KEY

276.66

SLC

286.24

CHS

284.04

YAK

285.58

ROR

274.77

OME

286.23

RNK

283.19

ROR

285.44

YAP

274.65

UNR

285.39

ALY

281.50

UNR

285.36

CHS

273.91

TKK

281.96

YAP

280.41

TWC

285.35

DVN

269.59

ALY

281.38

MAJ

278.91

ALY

282.98

VEF

269.49

MAJ

277.63

CAR

276.57

GUM

279.20

GGW

266.79

TWC

275.59

YAK

275.76

YAP

276.58

FFC

257.83

CDB

262.90

TWC

270.74

TKK

248.50

TKK

217.58

PNI

240.15

PNI

157.26

PNI

241.09

Nat'l Avg

291.01

Nat'l Avg

293.26

Nat'l Avg

291.96

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