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

May Rank

ID

Jun Rank

ID

Jul Rank

ID

12 month avg.

OTZ

300.00

MHX

300.00

BRW

300.00

MFR

298.15

UIL

299.99

BET

300.00

BMX

300.00

BRO

297.48

CHS

299.97

AFC

300.00

AFC

300.00

MAF

297.44

MCG

299.96

OKX

299.99

UIL

299.98

AFC

297.34

DNR

299.95

CHS

299.98

BUF

299.98

INL

297.33

OHX

299.91

TFX

299.97

MAF

299.96

RNK

297.21

GRB

299.86

ABQ

299.96

NKX

299.96

DRT

297.12

MFR

299.84

GSO

299.94

MFR

299.86

OTX

296.86

RIW

299.83

ILN

299.92

OKX

299.19

EPZ

296.76

DRT

299.83

LIH

299.91

SLE

299.18

ITO

296.63

VEF

299.80

OAK

299.89

CHH

299.17

GJT

296.61

GJT

299.39

CHH

299.89

TFX

299.16

BOI

296.55

FGZ

299.27

MFR

299.78

SNP

299.16

DTX

296.47

CHH

299.19

EPZ

299.77

LWX

299.14

ABR

296.39

BRO

299.19

REV

299.69

ABQ

299.12

ABQ

296.37

ILN

299.06

JAN

299.67

CAR

299.10

SLE

296.35

INL

299.06

ITO

299.58

REV

299.03

ILN

296.30

REV

298.95

GUM

299.17

ITO

298.96

OHX

295.95

SHV

298.90

BOI

299.17

LIH

298.91

NKX

295.88

LIH

298.90

MCG

299.17

TBW

298.38

LKN

295.64

RNK

298.88

TAE

299.15

FWD

298.37

TFX

295.62

LZK

298.39

NKX

299.13

SLC

298.37

SJU

295.48

BRW

298.39

VEF

299.08

RNK

298.35

BET

295.37

BOI

298.39

DNR

299.05

RIW

298.20

TWC

295.36

SLE

298.35

OHX

299.01

CDB

298.03

CRP

295.29

ITO

298.31

TOP

298.95

GJT

297.65

TBW

295.25

WAL

298.15

ABR

298.82

ILX

297.57

GSO

295.20

BUF

297.56

LKN

298.52

SJU

297.56

OKX

295.19

TAE

297.56

CRP

298.33

CRP

297.54

SLC

295.18

SGF

297.54

CAR

298.33

BOI

297.54

ANN

295.13

CDB

297.54

MAF

298.29

BET

297.52

JAN

295.12

AKN

297.50

OTX

298.27

UNR

297.50

REV

295.12

ILX

297.47

SLE

298.10

AFG

297.25

OAK

295.09

DDC

297.40

GJT

298.06

ANN

296.77

TOP

295.06

EPZ

297.29

OUN

297.90

DRT

296.76

FWD

295.01

SNP

296.77

PBZ

297.50

DNR

296.73

BRW

295.01

AFG

296.72

OTZ

297.50

PPG

296.70

LIH

295.01

TFX

296.71

GYX

297.44

OHX

296.69

AFG

294.85

LIX

296.64

LWX

297.43

DTX

296.65

MHX

294.85

LKN

296.32

SGF

297.37

BRO

295.97

LWX

294.69

SLC

295.99

BRO

296.67

MHX

295.96

CHS

294.58

SJU

295.97

MFL

296.65

GSO

295.96

VEF

294.56

APX

295.95

YAK

296.64

INL

295.91

GGW

294.31

BMX

295.95

INL

296.63

LCH

295.90

SNP

294.27

GGW

295.93

SNP

296.59

MPX

295.89

AKN

294.23

ALY

295.93

FGZ

296.56

GRB

295.85

BMX

294.19

DTX

295.93

SHV

296.48

LBF

295.82

OAX

294.16

MPX

295.89

FFC

295.83

MCG

295.15

MFL

293.87

TOP

295.89

BRW

295.82

JAX

295.14

KEY

293.84

OAK

295.87

BIS

295.76

ABR

295.09

SHV

293.75

PBZ

295.85

DTX

295.76

JAN

295.08

ILX

293.71

JAN

295.79

WAL

295.70

TWC

295.05

RIW

293.68

ABR

295.58

GGW

295.59

ILN

294.97

MPX

293.65

AFC

295.16

CDB

295.00

TOP

294.95

DDC

293.62

ANN

295.15

ALY

294.98

CHS

294.34

LZK

293.42

NKX

295.13

AMA

294.96

KEY

294.33

PBZ

293.13

PNI

295.08

SJU

294.96

EPZ

294.30

JAX

292.69

ABQ

294.99

TBW

294.95

SHV

294.28

AMA

292.59

MHX

294.39

ILX

294.77

OTZ

294.24

LBF

292.23

OTX

294.29

PPG

294.64

GGW

294.13

LCH

292.19

OKX

294.29

GRB

294.34

OAX

294.13

SGF

292.15

FWD

294.26

KEY

294.17

LKN

293.93

YAK

292.10

GYX

294.25

RNK

294.17

LZK

293.53

OME

291.74

DVN

294.25

DRT

294.17

AKN

293.49

BIS

291.72

YAK

294.24

SLC

294.07

FFC

293.43

CAR

291.63

MFL

293.55

APX

294.01

LIX

292.68

APX

291.51

BET

293.55

ADQ

293.79

OTX

292.61

BUF

291.50

MAF

293.42

JAX

293.33

AMA

292.58

DNR

291.19

FFC

293.41

AFG

293.32

OAK

292.43

FGZ

290.89

TBW

292.74

LCH

293.31

OME

291.94

WAL

290.51

GSO

292.72

RIW

293.10

GYX

291.13

GRB

290.49

OME

292.70

UIL

292.50

TAE

291.12

LIX

290.41

YAP

292.67

LIX

291.67

MFL

291.11

DVN

290.39

OUN

292.63

OAX

291.48

BIS

290.93

OUN

290.20

AMA

292.55

DDC

291.34

DDC

290.32

ADQ

289.66

JAX

292.25

UNR

291.32

YAK

290.30

CHH

289.42

MAJ

291.94

ANN

290.83

ALY

289.47

ALY

289.13

TWC

291.73

BUF

290.75

WAL

287.81

UIL

288.57

OAX

291.73

OME

289.17

ADQ

286.63

FFC

287.89

LWX

291.09

DVN

289.05

APX

286.26

GYX

287.88

CRP

291.07

BMX

288.31

PBZ

285.91

GUM

287.80

PPG

290.79

TWC

288.30

GUM

285.42

ROR

287.55

KEY

290.28

ROR

287.50

DVN

284.55

MAJ

286.54

CAR

289.47

AKN

287.45

ROR

284.24

MCG

286.40

BIS

288.68

MPX

285.29

SGF

283.85

PPG

285.79

ADQ

288.63

MAJ

285.00

YAP

282.17

CDB

283.53

ROR

288.61

FWD

284.89

MAJ

278.94

TLH

283.29

LCH

287.85

LZK

284.38

TKK

270.01

OTZ

283.04

LBF

287.04

LBF

282.58

VEF

267.72

UNR

282.62

GUM

281.40

YAP

265.40

FGZ

265.60

TKK

275.68

UNR

269.34

PNI

234.17

OUN

265.30

PNI

275.14

TKK

236.18

TKK

219.93

PNI

197.51

YAP

272.76

Nat'l Avg

294.60

Nat'l Avg

293.69

Nat'l Avg

292.56

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