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

Apr Rank

ID

May Rank

ID

Jun Rank

ID

12 month avg.

APX

300.00

TFX

300.00

SLE

300.00

MCG

297.97

MFR

299.98

GYX

300.00

BRO

300.00

MFR

297.41

SGF

299.92

ANN

300.00

BOI

300.00

NKX

297.40

OAX

299.85

ABR

299.96

AMA

299.98

LKN

297.24

DDC

299.61

BIS

299.94

MCG

299.98

BRW

297.20

ITO

299.49

PBZ

299.87

NKX

299.96

ABQ

297.18

TBW

299.17

EPZ

299.82

GGW

299.95

ABR

297.11

SJU

299.17

LCH

299.79

UIL

299.95

OTX

297.05

DTX

299.16

ADQ

299.60

ADQ

299.83

GJT

296.99

MCG

299.15

ITO

299.54

ABR

299.79

ITO

296.94

GYX

299.15

UIL

299.18

LKN

299.68

TFX

296.90

UIL

299.14

MFR

299.16

SNP

299.17

BOI

296.81

OTX

299.11

INL

299.16

CRP

299.17

ILX

296.51

SLE

299.10

LKN

299.08

ANN

299.17

AFC

296.48

DNR

299.08

OAK

298.81

TFX

299.15

OAX

296.38

OHX

299.06

OKX

298.74

MFR

299.11

OHX

296.30

ILX

299.01

BRW

298.39

DRT

299.11

BUF

296.21

SHV

298.95

APX

298.39

REV

299.10

SLE

296.18

GJT

298.93

OTX

298.36

WAL

299.05

EPZ

296.17

LKN

298.76

MPX

298.35

PBZ

299.00

ILN

296.11

CHH

298.33

SGF

298.35

LBF

298.97

DRT

295.95

NKX

298.32

MHX

298.29

CDB

298.38

INL

295.89

MHX

298.26

GJT

298.29

LCH

298.33

LIH

295.87

BUF

298.25

LIH

298.29

JAX

298.33

SLC

295.85

GUM

297.50

LIX

298.28

BUF

298.25

SGF

295.85

BRO

297.50

DDC

298.12

GYX

297.98

APX

295.80

ANN

297.50

SNP

297.58

ITO

297.78

OKX

295.65

INL

297.47

AFC

297.58

SJU

297.50

ANN

295.62

BIS

297.44

RIW

297.56

LZK

297.50

TOP

295.59

EPZ

297.39

OME

297.54

RIW

297.48

AFG

295.58

GRB

296.67

DTX

297.54

AKN

297.48

MAF

295.35

AKN

296.67

ILN

297.52

DNR

297.19

SJU

295.23

AFC

296.67

AFG

297.48

MPX

297.12

LCH

295.21

ABQ

296.65

LWX

297.46

CHS

296.67

RIW

295.20

UNR

296.61

CHH

296.77

OTZ

296.67

TBW

295.18

GSO

296.61

SLC

296.67

DDC

296.67

REV

295.10

LIH

296.48

OTZ

295.97

OKX

296.65

UIL

295.07

CRP

295.82

AKN

295.97

AFG

296.65

LWX

295.06

MPX

295.81

TAE

295.95

BMX

295.83

LIX

295.05

ILN

295.80

TBW

295.95

BET

295.80

SNP

294.96

KEY

295.79

JAN

295.88

JAN

295.72

MHX

294.82

DRT

295.78

FFC

295.82

OAK

295.62

DTX

294.80

JAX

295.76

GSO

295.16

VEF

295.62

BMX

294.76

ABR

295.69

UNR

295.16

PNI

295.56

PBZ

294.69

OTZ

295.65

OAX

295.14

OHX

295.00

CRP

294.68

LIX

295.65

LBF

295.14

ABQ

295.00

SHV

294.63

MFL

295.00

MCG

295.11

SGF

294.96

MPX

294.58

TFX

294.99

CRP

295.06

SLC

294.95

RNK

294.56

BRW

294.97

SHV

294.95

RNK

294.92

DDC

294.55

GGW

294.92

SLE

294.35

OAX

294.87

OTZ

294.44

SLC

294.17

MFL

294.35

GJT

294.80

CHH

294.43

AFG

294.17

BOI

294.35

OTX

294.78

GYX

294.31

REV

294.15

BMX

294.35

LIH

294.70

JAX

294.30

LBF

294.01

ILX

294.29

MHX

294.17

GSO

293.89

TOP

293.96

OHX

294.27

BRW

294.17

BRO

293.76

FGZ

293.52

WAL

294.25

AFC

294.17

AMA

293.72

BET

293.33

MAF

293.96

DTX

294.15

LZK

293.62

BOI

293.33

GGW

293.49

OME

294.15

MFL

293.59

SNP

292.50

DVN

293.45

CHH

294.14

DNR

293.29

LWX

292.45

NKX

292.71

YAK

294.13

TLH

293.08

TAE

292.38

ABQ

292.70

APX

294.13

JAN

292.91

LZK

292.38

BET

292.70

FWD

294.13

DVN

292.69

OUN

291.69

LZK

292.66

ILN

294.00

OAK

292.64

ADQ

291.65

TOP

292.54

FFC

293.32

BIS

292.29

OAK

291.59

CDB

291.92

TOP

293.25

FWD

292.24

OKX

291.52

RNK

291.86

EPZ

293.01

GGW

291.97

WAL

291.51

YAK

291.86

DVN

292.95

BET

291.85

LCH

291.51

ROR

291.82

OUN

292.50

GRB

291.52

ROR

290.83

FGZ

291.47

SHV

292.47

ADQ

291.47

DVN

290.80

PPG

291.22

GUM

291.67

LBF

291.36

FFC

290.75

DNR

291.09

MAF

291.60

AKN

290.70

MAF

289.86

VEF

291.08

TBW

290.83

CDB

290.34

AMA

289.67

BUF

290.30

LIX

290.83

CAR

290.01

VEF

289.08

TWC

289.52

KEY

290.83

PPG

289.78

JAN

289.04

GUM

289.49

TAE

290.74

FGZ

289.74

CDB

288.29

CAR

289.49

INL

290.69

KEY

289.40

BMX

288.27

DRT

289.29

PPG

290.21

CHS

288.59

RIW

287.43

JAX

287.88

ILX

289.93

FFC

288.32

PPG

285.70

KEY

287.10

LWX

289.91

OUN

288.16

PBZ

285.69

SJU

286.91

FGZ

289.25

WAL

288.04

TKK

285.00

CHS

286.29

GSO

289.15

VEF

287.13

OME

284.97

REV

284.68

GRB

288.07

UNR

287.12

FWD

284.60

OUN

282.92

TWC

287.50

OME

286.65

CHS

284.04

AMA

282.05

MFL

287.02

YAK

285.17

RNK

283.19

GRB

281.42

UNR

286.65

TWC

285.10

ALY

281.50

TKK

278.98

MAJ

284.17

ROR

284.94

YAP

280.41

FWD

276.95

CAR

283.33

MAJ

284.13

MAJ

278.91

ALY

275.75

TKK

282.45

ALY

280.10

CAR

276.57

MAJ

274.06

YAP

282.32

GUM

279.25

YAK

275.76

PNI

271.50

ALY

280.59

YAP

275.61

TWC

270.74

YAP

264.12

ROR

278.27

TKK

257.28

PNI

157.26

BRO

252.23

BIS

266.16

PNI

244.24

Nat'l Avg

291.96

Nat'l Avg

292.92

Nat'l Avg

294.19

 

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