AD Reserved
AF Surface frost intensity (coded, see Table 20)
AG Percent of green vegetation (%)
AM Surface dew intensity (coded, see Table 21)
AT Time below critical temperature, 25 DF or -3.9 DC (HRS and MIN)
AU Time below critical temperature, 32 DF or 0 DC (HRS and MIN)
AW Leaf wetness (HRS and MIN)
BA Solid portion of water equivalent (in, mm)
BB Heat deficit (in, mm)
BC Liquid water storage (in, mm)
BD Temperature index (DF, DC)
BE Maximum water equivalent since snow began to accumulate (in, mm)
BF Areal water equivalent just prior to the new snowfall (in, mm)
BG Areal extent of snow cover from the areal depletion curve just prior to the new snowfall (%)
BH Amount of water equivalent above which 100 % areal snow cover temporarily exists (in, mm)
BI Excess liquid water in storage (in, mm)
BJ Areal extent of snow cover adjustment (in, mm)
BK Lagged excess liquid water for interval 1 (in, mm)
BL Lagged excess liquid water for interval 2 (in, mm)
BM Lagged excess liquid water for interval 3 (in, mm)
BN Lagged excess liquid water for interval 4 (in, mm)
BO Lagged excess liquid water for interval 5 (in, mm)
BP Lagged excess liquid water for interval 6 (in, mm)
BQ Lagged excess liquid water for interval 7 (in, mm)
CA Upper zone tension water contents (in, mm)
CB Upper zone free water contents (in, mm)
CC Lower zone tension water contents (in, mm)
CD Lower zone free water supplementary storage contents (in, mm)
CE Lower zone free water primary storage contents (in, mm)
CF Additional impervious area contents (in, mm)
CG Antecedent precipitation index (in, mm)
CH Soil moisture index deficit (in, mm)
CI Base flow storage contents (in, mm)
CJ Base flow index (in, mm)
CK First quadrant index Antecedent Evaporation Index (AEI) (in, mm)
CL First quadrant index Antecedent Temperature Index (ATI) (DF, DC)
CM Frost index (DF, DC)
CN Frost efficiency index (%)
CO Indicator of first quadrant index (AEI or ATI)
CP Storm total rainfall (in, mm)
CQ Storm total runoff (in, mm)
CR Storm antecedent index (in, mm)
CS Current antecedent index (in, mm)
CT Storm period counter (integer)
CU Average air temperature (DF, DC)
CV Current corrected synthetic temperature (DF, DC)
CW Storm antecedent evaporation index, AEI (in, mm)
CX Current AEI (in, mm)
CY Current API (in, mm)
CZ Climate Index
EA Evapotranspiration potential amount (IN, MM)
ED Evaporation, pan depth (IN, MM)
EM Evapotranspiration amount (IN, MM)
EP Evaporation, pan increment (IN, MM)
ER Evaporation rate (IN/day, MM/day)
ET Evapotranspiration total (IN, MM)
EV Evaporation, lake computed (IN, MM)
FA Fish - shad
FB Fish - sockeye
FC Fish - chinook
FE Fish - chum
FK Fish - coho
FL Fish - ladder (1=left, 2=right, 3=total)
FP Fish - pink
FS Fish – steelhead
FT Fish type - type (1=adult, 2=jacks, 3=fingerlings)
FZ Fish - count of all types combined
GC Condition, road surface (coded, see Table 1)
GD Frost depth, depth of frost penetration, non permafrost (IN, CM)
GL Salt content on a surface (e.g., road) (%)
GP Frost, depth of pavement surface (IN, CM)
GR Frost report, structure (coded, see Table 16)
GS Ground state (coded, see Table 18)
GT Frost, depth of surface frost thawed (IN, CM)
GW Frost, depth of pavement surface frost thawed (IN, CM)
HA Height of reading, altitude above surface (FT, M)
HB Depth of reading below surface, or to water table or groundwater (FT, M)
HC Height, ceiling (FT, M)
HD Height, head (FT, M)
HE Height, regulating gate (FT, M)
HF Elevation, project powerhouse forebay (FT, M)
HG Height, river stage (FT, M)
HH Height of reading, elevation in MSL (FT, M)
HI Stage trend indicator (coded, see Table 19)
HJ Height, spillway gate (FT, M)
HK Height, lake above a specified datum (FT, M)
HL Elevation, natural lake (FT, M)
HM Height of tide, MLLW (FT, M)
HN (S) Height, river stage, daily minimum, translates to HGIRZNZ (FT, M)
HO Height, flood stage (FT, M)
HP Elevation, pool (FT, M)
HQ Distance from a ground reference point to the river's edge used to estimate stage (coded, see Chapter 7.4.6)
HR Elevation, lake or reservoir rule curve (FT, M)
HS Elevation, spillway forebay (FT, M)
HT Elevation, project tail water stage (FT, M)
HU Height, cautionary stage (FT, M)
HV Depth of water on a surface (e.g., road) (IN, MM)
HW Height, spillway tail water (FT, M)
HX (S) Height, river stage, daily maximum, translates to HGIRZXZ (FT, M) 
HY (S) Height, river stage at 7 a.m. local just prior to date-time stamp, translates to HGIRZZZ at 7 a.m. local time (FT, M)
HZ Elevation, freezing level (KFT, KM)
IC Ice cover, river (%)
IE Extent of ice from reporting area, upstream “+,” downstream - (MI, KM)
IO Extent of open water from reporting area, downstream “+,” upstream - (FT, M)
IR Ice report type, structure, and cover (coded, see Table 14)
IT Ice thickness (IN, CM)
LA Lake surface area (KAC,KM2)
LC Lake storage volume change (KAF,MCM)
LS Lake storage volume (KAF,MCM)
MD Dielectric Constant at depth, paired value vector (coded, see Chapter 7.4.6 for format)
MI Moisture, soil index or API (IN, CM)
ML Moisture, lower zone storage (IN, CM)
MM Fuel moisture, wood (%)
MN Soil Salinity at depth, paired value vector (coded, see Chapter 7.4.6 for format)
MS Soil Moisture amount at depth (coded, see Chapter 7.4.6)
MT Fuel temperature, wood probe (DF, DC)
MU Moisture, upper zone storage (IN, CM)
MV Water Volume at Depth, paired value vector (coded, see Chapter 7.4.6 for format)
MW Moisture, soil, percent by weight (%)
NC River control switch (0=manual river control, 1=open river uncontrolled)
NG Total of gate openings (FT, M)
NL Number of large flash boards down (whole number)
NN Number of the spillway gate reported (used with HP, QS)
NO Gate opening for a specific gate (coded, see Chapter 7.4.6)
NS Number of small flash boards down (whole number)
PA Pressure, atmospheric (IN-HG, KPA)
PC Precipitation, accumulator (IN, MM)
PD Pressure, atmospheric net change during past 3 hours (IN-HG, KPA)
PE Pressure, characteristic, NWS Handbook #7, table 10.7
PF (S) Precipitation, flash flood guidance, precipitation to initiate flooding, translates to PPTCF for 3-hour intervals (IN, MM)
PJ Precipitation, departure from normal (IN, MM)
PL Pressure, sea level (IN-HG, KPA)
PM Probability of measurable precipitation (dimensionless) (coded, see Table 22)
PN Precipitation normal (IN, MM)
PP Precipitation (includes liquid amount of new snowfall), actual increment (IN, MM)
PR Precipitation rate (IN/day, MM/day)
PT Precipitation, type (coded, see Table 17)
PY (S) Precipitation, increment ending at 7 a.m. local just prior to date-time stamp, translates to PPDRZZZ at 7 a.m. local time (IN, MM)
QA Discharge, adjusted for storage at project only (KCFS, CMS)
QB Runoff depth (IN, MM)
QC Runoff volume (KAF, MCM)
QD Discharge, canal diversion (KCFS, CMS)
QE Discharge, percent of flow diverted from channel (%)
QF Discharge velocity (MPH, KPH)
QG Discharge from power generation (KCFS, CMS)
QI Discharge, inflow (KCFS, CMS)
QL Discharge, rule curve (KCFS, CMS)
QM Discharge, preproject conditions in basin (KCFS, CMS)
QN (S) Discharge, minimum flow, translates to QRIRZNZ (KCFS, CMS)
QP Discharge, pumping (KCFS, CMS)
QR Discharge, river (KCFS, CMS)
QS Discharge, spillway (KCFS, CMS)
QT Discharge, computed total project outflow (KCFS, CMS)
QU Discharge, controlled by regulating outlet (KCFS, CMS)
QV Cumulative volume increment (KAF, MCM)
QX (S) Discharge, maximum flow, translates to QRIRZXZ (KCFS, CMS)
QY (S) Discharge, river at 7 a.m. local just prior to date-time stamp translates to QRIRZZZ at 7 a.m. local time (KCFS, CMS)
QZ Reserved
RA Radiation, albedo (%)
RI Radiation, accumulated incoming solar over specified duration in langleys (LY)
RN Radiation, net radiometers (watts/meter squared)
RP Radiation, sunshine percent of possible (%)
RT Radiation, sunshine hours (HRS)
RW Radiation, total incoming solar radiation (watts/meter squared)
SA Snow, areal extent of basin snow cover (%)
SB Snow, Blowing Snow Sublimation (IN)
SD Snow, depth (IN, CM)
SE Snow, Average Snowpack Temperature (DF)
SF Snow, depth, new snowfall (IN, CM)
SI Snow, depth on top of river or lake ice (IN, CM)
SL Snow, elevation of snow line (KFT, M)
SM Snow, Melt (IN)
SP Snowmelt plus rain (IN)
SR Snow report, structure, type, surface, and bottom (coded, see Table 15)
SS Snow density (IN SWE/IN snow, CM SWE/CM snow)
ST Snow temperature at depth measured from ground (See Chapter 7.4.6 for format)
SU Snow, Surface Sublimation (IN)
SW Snow, water equivalent (IN, MM)
TA Temperature, air, dry bulb (DF,DC)
TB Temperature in bare soil at depth (coded, see Chapter 7.4.6 for format)
TC Temperature, degree days of cooling, above 65 DF or 18.3 DC (DF,DC)
TD Temperature, dew point (DF,DC)
TE Temperature, air temperature at elevation above MSL (See Chapter 7.4.6 for format)
TF Temperature, degree days of freezing, below 32 DF or 0 DC (DF,DC)
TH Temperature, degree days of heating, below 65 DF or 18.3 DC (DF,DC)
TJ Temperature, departure from normal (DF, DC)
TM Temperature, air, wet bulb (DF,DC)
TN (S) Temperature, air minimum, translates to TAIRZNZ (DF,DC)
TP Temperature, pan water (DF,DC)
TR Temperature, road surface (DF,DC)
TS Temperature, bare soil at the surface (DF,DC)
TV Temperature in vegetated soil at depth (coded, see Chapter 7.4.6 for format)
TW Temperature, water (DF,DC)
TX (S) Temperature, air maximum, translates to TAIRZXZ (DF,DC)
TZ Temperature, Freezing, road surface (DF,DC)
UC Wind, accumulated wind travel (MI,KM)
UD Wind, direction (whole degrees)
UE Wind, standard deviation (Degrees)
UG Wind, gust at observation time (MI/HR,M/SEC)
UH Wind gust direction associated with the wind gust (in tens of degrees)
UL Wind, travel length accumulated over specified (MI,KM)
UP Peak wind speed (MPH)
UQ Wind direction and speed combined (SSS.SDDD), a value of 23.0275 would indicate a wind of 23.0 mi/hr from 275 degrees
UR Peak wind direction associated with peak wind speed (in tens of degrees)
US Wind, speed (MI/HR,M/SEC)
UT Minute of the peak wind speed (in minutes past the hour, 0-59)
VB Voltage - battery (volt)
VC Generation, surplus capacity of units on line (megawatts)
VE Generation, energy total (megawatt hours)
VG Generation, pumped water, power produced (megawatts)
VH Generation, time (HRS)
VJ Generation, energy produced from pumped water (megawatt hours)
VK Generation, energy stored in reservoir only (megawatt * “duration”)
VL Generation, storage due to natural flow only (megawatt * “duration”)
VM Generation, losses due to spill and other water losses (megawatt * “duration”)
VP Generation, pumping use, power used (megawatts)
VQ Generation, pumping use, total energy used (megawatt hours)
VR Generation, stored in reservoir plus natural flow, energy potential (megawatt * “duration”)
VS Generation, station load, energy used (megawatt hours)
VT Generation, power total (megawatts)
VU Generator, status (encoded)
VW Generation station load, power used (megawatts)
WA Water, dissolved nitrogen & argon (PPM, MG/L)
WC Water, conductance (uMHOS/CM)
WD Water, piezometer water depth (IN, CM)
WG Water, dissolved total gases, pressure (IN-HG, MM-HG)
WH Water, dissolved hydrogen sulfide (PPM, MG/L)
WL Water, suspended sediment (PPM, MG/L)
WO Water, dissolved oxygen (PPM, MG/L)
WP Water, ph (PH value)
WS Water, salinity (parts per thousand, PPT)
WT Water, turbidity (JTU)
WV Water, velocity (FT/SEC, M/SEC)
WX Water, Oxygen Saturation (%)
WY Water, Chlorophyll (ppb, ug/L)
XC Total sky cover (tenths)
XG Lightning, number of strikes per grid box (whole number)
XL Lightning, point strike, assumed one strike at transmitted latitude and longitude (whole number)
XP Weather, past NWS synoptic code (see Appendix D)
XR Humidity, relative (%)
XU Humidity, absolute (grams/FT3,grams/M3)
XV Weather, visibility (MI, KM)
XW Weather, present NWS synoptic code (see Appendix C)
YA Number of 15-minute periods a river has been above a specified critical level (whole number)
YC Random report sequence number (whole number)
YF Forward power, a measurement of the DCP, antenna, and coaxial cable (watts)
YI SERFC unique
YP Reserved Code
YR Reflected power, a measurement of the DCP, antenna, and coaxial cable (watts)
YS Sequence number of the number of times the DCP has transmitted (whole number)
YT Number of 15-minute periods since a random report was generated due to an increase of 0.4 inch of precipitation (whole number)
YU GENOR raingage status level 1 - NERON observing sites (YUIRG)
YV A Second Battery Voltage (NERON sites ONLY), voltage 0 (YVIRG)
YW GENOR raingage status level 2 - NERON observing sites (YWIRG)
YY GENOR raingage status level 3 - NERON observing sites (YYIRG)
YZ Time of Observation – Minutes of the calendar day, minutes 0 - NERON observing sites (YZIRG)
