NBM v4.2 Weather Elements - MDL
NBM v4.2 Weather Elements by Category
These are the weather elements available in NBM v4.2, the regions they are available, and their definitions. Weather elements new to NBM v4.2 are marked with an * . Regions available are marked by x in a the region column. The regions are: CONUS (CO), Alaska (AK), Puerto Rico (PR), Hawaii (HI), Guam (GU) and Oceanic (OC). The elements are separated into six tables, each with a category of data: surface, aviation (includes 10m winds), fire weather, winter weather, marine, and upper air.
You can use the Page Contents menu to skip to a given category, and click on the up-arrow next to a category label to return to the top of this page.
NBM V4.2 SURFACE WEATHER ELEMENTS
Surface Weather Elements | CO | AK | PR | HI | GU | OC | Definition |
---|---|---|---|---|---|---|---|
TEMPERATURE | |||||||
MaxT | x | x | x | x | x | Maximum Temperature; Time Window: 12z to 06z except 18z to 12z in Guam | |
MinT | x | x | x | x | x | Minimum Temperature; Time Window: 00z to 18z except 06z to 00z in Guam | |
MaxT SD | x | x | x | x | Standard Deviation (SD) of Maximum Temperature; Time Window: 12z to 06z except 18z to 12z in Guam | ||
Weighting/Calculation: | |||||||
MinT SD | x | x | x | x | Standard Deviation (SD) of Minimum Temperature; Time Window: 00z to 18z except 06z to 00z in Guam | ||
Weighting/Calculation: | |||||||
PctMaxT QMD | x | x | Percentiles from 1-99 of Maximum Temperature; derived from the QMD inputs; Time Window: 12z to 06z except 18z to 12z in Guam | ||||
Weighting/Calculation: | |||||||
PctMinT QMD | x | x | Percentiles from 1-99 of Minimum Temperature; derived from the QMD inputs; Time Window: 00z to 18z except 06z to 00z in Guam | ||||
Weighting/Calculation: | |||||||
MaxT QMD Mean | x | x | Arithmetic mean of Maximum Temperature QMD inputs; Time Window: 12z to 06z except 18z to 12z in Guam | ||||
Weighting/Calculation: | |||||||
MinT QMD Mean | x | x | Arithmetic mean of Minimum Temperature QMD inputs; Time Window: 00z to 18z except 06z to 00z in Guam | ||||
Weighting/Calculation: | |||||||
MaxT QMD SD | x | x | Standard Deviation (SD) of Maximum Temperature QMD inputs; Time Window: 12z to 06z except 18z to 12z in Guam | ||||
Weighting/Calculation: | |||||||
MinT QMD SD | x | x | Standard Deviation (SD) of Minimum Temperature QMD inputs; Time Window: 00z to 18z except 06z to 00z in Guam | ||||
Weighting/Calculation: | |||||||
Temp | x | x | x | x | x | x | Top of hour value of temperature; hourly through 36 hours, then 3 hourly to 192 hours, then 6 hourly to 264. |
Temp SD | x | x | x | x | x | Top of the hour value Temperature Standard Deviation (SD) | |
Weighting/Calculation: | |||||||
AppT | x | x | x | x | Apparent Temperature; derived parameter from Temp, Td, and wind speed | ||
Weighting/Calculation: | |||||||
WBGT | x | x | x | x | Wet Bulb Globe Temperature; measure of heat stress using NBM Temp, Td, Sky, Wspd, and MSLP | ||
Weighting/Calculation: | |||||||
PRECIPITATION | |||||||
QPF01 | x | x | x | x | x | Quantitative Precipitation Forecast; hourly rainfall or melted liquid equivalent of frozen/freezing precipitation to 264 hours | |
QPF06 | x | x | x | x | x | Quantitative Precipitation Forecast; 6-hour forecast | |
PctQPF06 QMD | x | x | x | x | x | Percentile Quantitative Precipitation Forecast; derived from the QMD inputs; 6-hour percentiles from 1-99 | |
Weighting/Calculation: | |||||||
PctQPF12 QMD | x | x | x | x | x | Percentile Quantitative Precipitation Forecast; derived from the QMD inputs; 12-hour percentiles from 1-99 | |
Weighting/Calculation: | |||||||
PctQPF24 QMD | x | x | x | x | x | Percentile Quantitative Precipitation Forecast; derived from the QMD inputs; 24-hour percentiles from 1-99 | |
Weighting/Calculation: | |||||||
PctQPF48 QMD | x | x | x | x | x | Percentile Quantitative Precipitation Forecast; derived from the QMD inputs; 48-hour percentiles from 1-99 | |
Weighting/Calculation: | |||||||
PctQPF72 QMD | x | x | x | x | x | Percentile Quantitative Precipitation Forecast; derived from the QMD inputs; 72-hour percentiles from 1-99 | |
Weighting/Calculation: | |||||||
QPF06 QMD Mean | x | x | x | x | x | Quantitative Precipitation Forecast; 6-hour mean value | |
Weighting/Calculation: | |||||||
QPF12 QMD Mean | x | x | x | x | x | Percentile Quantitative Precipitation Forecast; derived from the QMD inputs; 12-hour mean value | |
Weighting/Calculation: | |||||||
QPF24 QMD Mean | x | x | x | x | x | Quantitative Precipitation Forecast; derived from the QMD inputs; 24-hour mean value | |
Weighting/Calculation: | |||||||
QPF48 QMD Mean | x | x | x | x | x | Quantitative Precipitation Forecast; derived from the QMD inputs; 48-hour mean value | |
Weighting/Calculation: | |||||||
QPF72 QMD Mean | x | x | x | x | x | Quantitative Precipitation Forecast; derived from the QMD inputs; 72-hour mean value | |
Weighting/Calculation: | |||||||
PoP01 | x | x | x | x | x | 1-hour Probability of Precipitation; through 36 hours | |
PoP06 | x | x | x | x | x | 6-hour Probability of Precipitation | |
PoP12 | x | x | x | x | x | 12-hour Probability of Precipitation | |
PoP06 QMD | x | x | x | x | x | 6-hour Probability of Precipitation; derived from the QMD inputs | |
Weighting/Calculation: | |||||||
PoP12 QMD | x | x | x | x | x | 12-hour Probability of Precipitation; derived from the QMD inputs | |
Weighting/Calculation: | |||||||
PoP24 QMD | x | x | x | x | x | 24-hour Probability of Precipitation; derived from the QMD inputs | |
Weighting/Calculation: | |||||||
Wx | x | x | Predominant Weather derived field | ||||
Weighting/Calculation: | |||||||
Duration | x | x | x | x | Number of hours within a 12 hour period that at least 0.01 in of QPF is forecast | ||
Weighting/Calculation: | |||||||
PROBABILITIES OF SPECIFIC AMOUNTS | |||||||
ProbMaxT QMD | x | x | Threshold probabilities of Maximum Temperature valid 12z to 06z; derived from the QMD inputs | ||||
Weighting/Calculation: | |||||||
ProbMinT QMD | x | x | Threshold probabilities of Minimum Temperature valid 00z to 18z; derived from the QMD inputs | ||||
Weighting/Calculation: | |||||||
ProbQPF06 QMD | x | x | x | x | x | 6-hour Quantitative Precipitation Forecast threshold probabilities; derived from the QMD inputs | |
Weighting/Calculation: | |||||||
ProbQPF12 QMD | x | x | x | x | x | 12-hour Quantitative Precipitation Forecast threshold probabilities; derived from the QMD inputs | |
Weighting/Calculation: | |||||||
ProbQPF24 QMD | x | x | x | x | x | 24-hour Quantitative Precipitation Forecast threshold probabilities; derived from the QMD inputs | |
Weighting/Calculation: | |||||||
ProbQPF48 QMD | x | x | x | x | x | 48-hour Quantitative Precipitation Forecast threshold probabilities; derived from the QMD inputs | |
Weighting/Calculation: | |||||||
ProbQPF72 QMD | x | x | x | x | x | 72-hour Quantitative Precipitation Forecast threshold probabilities; derived from the QMD inputs | |
Weighting/Calculation: | |||||||
HUMIDITY | |||||||
Td | x | x | x | x | x | Top of hour Dewpoint value; hourly through 36 hours, then 3 hourly to 192 hours, then 6 hourly to 264. | |
Td SD | x | x | x | x | x | Dewpoint Standard Deviation (SD) | |
Weighting/Calculation: | |||||||
RH | x | x | x | x | x | Relative Humidity; derived from Temp and Td | |
Weighting/Calculation: | |||||||
MaxRH | x | x | x | x | Maximum Relative Humidity; derived from highest hourly/3 hourly/6 hourly value | ||
Weighting/Calculation: | |||||||
MinRH | x | x | x | x | Minimum Relative Humidity; derived from lowest hourly/3 hourly/6 hourly value | ||
Weighting/Calculation: | |||||||
PRESSURE | |||||||
PctMSLP | x | Mean Sea Level Pressure; 10th, 25th, 50th, 75th, and 90th percentiles | |||||
Weighting/Calculation: | |||||||
PctMSLP Spread | x | Mean Sea Level Pressure; Spread between the 10th and 90th percentiles | |||||
Weighting/Calculation: |
NBM V4.2 AVIATION WEATHER ELEMENTS
Aviation Weather Elements | CO | AK | PR | HI | GU | OC | Definition |
---|---|---|---|---|---|---|---|
WIND | |||||||
10-m Speed | x | x | x | x | x | x | Top of hour sustained Wind Speed value; hourly through 36 hours, then 3 hourly to 192 hours, then 6 hourly to 264. |
Pct10-m Speed QMD | x | x | Top of hour sustained Wind Speed QMD percentile values; percentiles from 1-99 | ||||
Weighting/Calculation: | |||||||
10-m Speed QMD Mean* | x | Top of the hour sustained Wind Speed QMD mean; derived from the QMD inputs | |||||
Weighting/Calculation: | |||||||
10-m Speed QMD SD* | x | Top of the hour sustained Wind Speed QMD Standard Deviation (SD); derived from the QMD inputs | |||||
Weighting/Calculation: | |||||||
30-m Speed | x | x | x | x | x | x | Top of hour sustained Wind Speed value; hourly through 36 hours, then 3 hourly to 192 hours, then 6 hourly to 264. |
Weighting/Calculation: | |||||||
80-m Speed | x | x | x | x | x | x | Top of hour sustained Wind Speed value; hourly through 36 hours, then 3 hourly to 192 hours, then 6 hourly to 264. |
10-m Gust | x | x | x | x | x | x | Top of the hour Wind Gust value; hourly through 36 hours, then 3 hourly to 192 hours, then 6 hourly to 264. |
Pct10-m Gust QMD* | x | Top of hour Wind Gust QMD percentile values; percentiles from 1-99 | |||||
Weighting/Calculation: | |||||||
10-m Gust QMD Mean* | x | Top of the hour Wind Gust QMD mean; derived from QMD inputs | |||||
Weighting/Calculation: | |||||||
10-m Gust QMD SD* | x | Top of the hour Wind Gust QMD Standard Deviation (SD); derived from QMD inputs | |||||
Weighting/Calculation: | |||||||
10-m Direction | x | x | x | x | x | x | Top of the hour Wind Direction value |
Weighting/Calculation:CONUS Alaska Puerto Rico Hawaii Guam Oceanic | |||||||
10-m Speed SD | x | x | x | x | x | Wind Speed Standard Deviation (SD) | |
Weighting/Calculation: | |||||||
10-m Gust SD | x | x | x | x | x | Wind Gust Standard Deviation (SD) | |
Weighting/Calculation: | |||||||
30-m Direction | x | Top of the hour Wind Direction value | |||||
Weighting/Calculation:CONUS Alaska Puerto Rico Hawaii Guam Oceanic | |||||||
80-m Direction | x | Top of the hour Wind Direction value | |||||
Weighting/Calculation:CONUS Alaska Puerto Rico Hawaii Guam Oceanic | |||||||
PctMaxSpeed24 QMD | x | 24-hour Maximum Wind Speed percentile values; QMD percentiles from 1-99 | |||||
Weighting/Calculation: | |||||||
PctMaxGust24 QMD | x | 24-hour Maximum Wind Gust percentile values; QMD percentiles from 1-99 | |||||
Weighting/Calculation: | |||||||
MaxSpeed24 QMD Mean | x | 24-hour Maximum Wind Speed QMD mean; derived from the QMD inputs | |||||
Weighting/Calculation: | |||||||
MaxGust24 QMD Mean | x | 24-hour Maximum Wind Gust QMD mean; derived from the QMD inputs | |||||
Weighting/Calculation: | |||||||
MaxSpeed24 QMD SD | x | 24-hour Maximum Wind Speed Standard Deviation (SD); derived from the QMD inputs | |||||
Weighting/Calculation: | |||||||
MaxGust24 QMD SD | x | 24-hour Maximum Wind Gust Standard Deviation (SD); derived from the QMD inputs | |||||
Weighting/Calculation: | |||||||
LLWS Height | x | x | x | x | Intended to provide Low Level Wind Shear Height guidance (up to 2,000 feet AGL) for WFO TAFs | ||
Weighting/Calculation:CONUS Alaska Puerto Rico Hawaii Guam Oceanic | |||||||
LLWS Speed | x | x | x | x | Intended to provide Low Level Wind Shear Speed guidance (up to 2,000 feet AGL) for WFO TAFs | ||
LLWS Direction | x | x | x | x | x | Intended to provide Low Level Wind Shear Direction guidance (up to 2,000 feet AGL) for WFO TAFs | |
Weighting/Calculation: | |||||||
Low-Level Turbulence | x | x | x | x | x | Low level and mountain wave induced turbulence guidance | |
Weighting/Calculation: | |||||||
Ellrod Index | x | x | x | x | High level turbulence guidance for roughly the 300-200 mb layer | ||
Weighting/Calculation: | |||||||
CLOUDS AND OBSTRUCTIONS | |||||||
Cover | x | x | x | x | x | Mean Sky Cover 0-100% | |
Cover SD | x | x | x | x | x | Sky Cover Standard Deviation (SD) | |
Weighting/Calculation: | |||||||
Cig | x | x | x | x | x | The lowest broken or overcast cloud deck | |
Vis | x | x | x | x | x | x | The greatest horizontal distance objects can be seen and identified |
Weighting/Calculation: | |||||||
Base Height | x | x | x | x | x | Lowest cloud base whether or not a ceiling is present (could be FEW or SCT layer) | |
AWC Primary | x | Height of cloud base, top, and coverage of digital aviation service's primary cloud layer | |||||
Weighting/Calculation: | |||||||
AWC Secondary | x | Height of cloud base, top, and coverage of digital aviation service's secondary cloud layer | |||||
Weighting/Calculation: | |||||||
AWC Teritary | x | Height of cloud base, top, and coverage of digital aviation service's tertiary cloud layer | |||||
Weighting/Calculation: | |||||||
AWC High Level | x | Height of cloud base, top, and coverage of AWC's cirrus cloud layer | |||||
Weighting/Calculation: | |||||||
PROBABILITIES OF SPECIFIC AMOUNTS | |||||||
ProbCig | x | Threshold Probability of VLIFR (0 or 100), LIFR (200-400), IFR (500-900), and MVFR (1,000-3,000) ceilings | |||||
Weighting/Calculation: | |||||||
ProbVis | x | Threshold Probability of VLIFR (0), LIFR (1/4-3/4), IFR (1-3), and MVFR (3-5) visibilities | |||||
Weighting/Calculation: | |||||||
ProbSpeed QMD* | x | Probability of exceedence for various thresholds of QMD 10-m Wind Speeds at the top of the hour; derived from the QMD inputs | |||||
Weighting/Calculation: | |||||||
ProbGust QMD* | x | Probability of exceedence for various thresholds of QMD 10-m Wind Gusts at the top of the hour; derived from the QMD inputs | |||||
Weighting/Calculation: | |||||||
ProbMaxSpeed24 QMD | x | Probability of exceedence for various thresholds of QMD 10-m Maximum Wind Speeds over a 24-hour period; derived from the QMD inputs | |||||
Weighting/Calculation: | |||||||
ProbMaxGust24 QMD | x | Probability of exceedence for various thresholds of QMD 10-m Maximum Wind Gusts over a 24-hour period; derived from the QMD inputs | |||||
Weighting/Calculation: | |||||||
ProbCWASP | x | Probability of 50-64 (Marginal), 65-69 (Slight), 70-74 (Enhanced), 75-84 (Moderate), or 85-100 (High) Values of Craven Wiedenefeld Aggregate Severe Parameter: designed to detect environments favorable for significant hail and significant tornadoes | |||||
Weighting/Calculation: | |||||||
CONVECTION | |||||||
18 dbZ Echo Tops | x | x | x | x | x | Top of the hour height above mean sea level of highest light precipitation echoes (hourly 1-36 hours) | |
PoT01 | x | x | x | x | x | 1 hour probability of thunder through 36 hours | |
PoT03 | x | x | x | x | x | 3 hour probability of thunder through 192 hours | |
PoT06 | x | x | x | x | x | 6 hour probability of thunder through 192 hours | |
PoT12 | x | x | x | x | x | 12 hour probability of thunder through 192 hours | |
Max Reflectivity | x | x | x | x | x | Maximum reflectivity in the column over the past hour in dBZ (hourly 1-36 hours) | |
CWASP | x | Expert weighted mean of Craven Wiedenfeld Aggregate Severe Parameter (75% of EF2+ tornadoes have CWASP of 65+) | |||||
T-storm Coverage | x | x | x | x | x | A product closely follows AWC's three defined probabilistic categories of thunderstorm coverage: Isolated (10-20%), Scattered (30-50%), and Numerous (60-100%) | |
Weighting/Calculation: | |||||||
VIL | x | x | x | x | x | Top of the hour vertically integrated liquid (hourly 1-36 hours) | |
SBCAPE | x | x | x | x | x | Surface based Convectively Available Potential Energy | |
SBCAPE SD | x | x | x | x | x | Surface Based Convectively Available Potential Energy Standard Deviation | |
Weighting/Calculation: | |||||||
Percentile CWASP | x | 5th, 10th, 25th, 50th, 75th, 90th, and 95th percentile of CWASP | |||||
Weighting/Calculation: | |||||||
SPC ProbSevere 4 hour | x | SPC-POST calibrated HREF 4hr probability of severe hazards (wind/hail/tornado) | |||||
Weighting/Calculation: | |||||||
SPC ProbSevere 24 hour | x | SPC-POST calibrated HREF 24hr probability of severe hazards (wind/hail/tornado) | |||||
Weighting/Calculation: |
NBM V4.2 FIRE WEATHER ELEMENTS
Fire Weather Elements | CO | AK | PR | HI | GU | OC | Definition |
---|---|---|---|---|---|---|---|
POTENTIAL | |||||||
Haines Index | x | x | x | x | Calculation of six hour maximum value of Haines Index based on NBM unified terrain elevation (Low Haines up to 999 feet MSL, Mid Haines 1,000-2,999 MSL, and High Haines 3,000+ MSL) | ||
Weighting/Calculation: | |||||||
Fosberg Index | x | x | x | x | 6-Hour maximum Fosberg Fire Weather Index using 2-m temperature, 10-m wind speeds, and 2-m dew point/relative humidity | ||
Weighting/Calculation: | |||||||
Mixing Height | x | x | x | x | Combination of PBL height and modified Stull Method using 0.5K warm bubble (height above ground level) | ||
Weighting/Calculation: | |||||||
Solar Radiation | x | x | x | x | Incoming solar radiation | ||
Weighting/Calculation: | |||||||
Prob DryThunder | x | The joint probability in the SREF of one or more CG flashes within 20 km over the previous 3-h period in an environment favorable for dry thunderstorms [as defined by P(precip) <0.10 in x P(2-m RH) <30% x P(PW) <1 in] | |||||
Weighting/Calculation: | |||||||
WIND | |||||||
Transport WindSpd | x | x | x | x | Mean Wind Speed in the layer defined by mixing height | ||
Weighting/Calculation: | |||||||
Transport WindDir | x | x | x | x | Mean Wind Direction in the layer defined by mixing height | ||
Weighting/Calculation: | |||||||
Ventilation Rate | x | x | x | x | The product of the Mixing Height and the Transport Wind Speed | ||
Weighting/Calculation: |
NBM V4.2 WINTER WEATHER ELEMENTS
Winter Weather Elements | CO | AK | PR | HI | GU | OC | Definition |
---|---|---|---|---|---|---|---|
EXPECTED AMOUNT | |||||||
SnowAmt01 | x | x | 1-hour Snow Accumulation through 36 hours | ||||
SnowAmt06 | x | x | 6-hour Snow Accumulation through 264 hours | ||||
SnowAmt24 | x | x | 24-hour Snow Accumulation through 264 hours | ||||
Weighting/Calculation:CONUS Alaska Puerto Rico Hawaii Guam Oceanic | |||||||
SnowAmt48 | x | x | 48-hour Snow Accumulation through 264 hours | ||||
Weighting/Calculation:CONUS Alaska Puerto Rico Hawaii Guam Oceanic | |||||||
SnowAmt72 | x | x | 72-hour Snow Accumulation through 264 hours | ||||
Weighting/Calculation:CONUS Alaska Puerto Rico Hawaii Guam Oceanic | |||||||
IceAccum01 | x | x | 1-hour Flat Ice Accumulation using FRAM technique through 36 hours | ||||
Weighting/Calculation:CONUS Alaska Puerto Rico Hawaii Guam Oceanic | |||||||
IceAccum06 | x | x | 6-hour Flat Ice Accumulation using FRAM technique through 264 hours | ||||
IceAccum24 | x | x | 24-hour Flat Ice Accumulation using FRAM technique through 264 hours | ||||
Weighting/Calculation:CONUS Alaska Puerto Rico Hawaii Guam Oceanic | |||||||
IceAccum48 | x | x | 48-hour Flat Ice Accumulation using FRAM technique through 264 hours | ||||
Weighting/Calculation:CONUS Alaska Puerto Rico Hawaii Guam Oceanic | |||||||
IceAccum72 | x | x | 72-hour Flat Ice Accumulation using FRAM technique through 264 hours | ||||
Weighting/Calculation:CONUS Alaska Puerto Rico Hawaii Guam Oceanic | |||||||
ACCUMULATION PERCENTILES (INCHES) | |||||||
PctSnow01 | x | x | 1-hour Snow Accumulation percentiles | ||||
Weighting/Calculation: | |||||||
PctSnow06 | x | x | 6-hour Snow Accumulation percentiles | ||||
Weighting/Calculation: | |||||||
PctSnow24 | x | x | 24-hour Snow Accumulation percentiles | ||||
Weighting/Calculation: | |||||||
PctSnow48 | x | x | 48-hour Snow Accumulation percentiles | ||||
Weighting/Calculation: | |||||||
PctSnow72 | x | x | 72-hour Snow Accumulation percentiles | ||||
Weighting/Calculation: | |||||||
PctIce06 | x | x | 6-hour Flat Ice Accumulation (FRAM) percentiles | ||||
Weighting/Calculation: | |||||||
PctIce24 | x | x | 24-hour Flat Ice Accumulation (FRAM) percentiles | ||||
Weighting/Calculation: | |||||||
PctIce48 | x | x | 48-hour Flat Ice Accumulation (FRAM) percentiles | ||||
Weighting/Calculation: | |||||||
PctIce72 | x | x | 72-hour Flat Ice Accumulation (FRAM) percentiles | ||||
Weighting/Calculation: | |||||||
PROBABILITIES OF SPECIFIC AMOUNTS (>1 in, >12 in etc) | |||||||
ProbSnow01 | x | x | 1-hour threshold probability of exceedance for Snow Accumulation | ||||
Weighting/Calculation: | |||||||
ProbSnow06 | x | x | 6-hour threshold probability of exceedance for Snow Accumulation | ||||
Weighting/Calculation: | |||||||
ProbSnow24 | x | x | 24-hour threshold probability of exceedance for Snow Accumulation | ||||
Weighting/Calculation: | |||||||
ProbSnow48 | x | x | 48-hour threshold probability of exceedance for Snow Accumulation | ||||
Weighting/Calculation: | |||||||
ProbSnow72 | x | x | 72-hour threshold probability of exceedance for Snow Accumulation | ||||
Weighting/Calculation: | |||||||
ProbIce06 | x | x | 6-hour threshold probability of exceedance for Flat Ice Accumulation (FRAM) | ||||
Weighting/Calculation: | |||||||
ProbIce24 | x | x | 24-hour threshold probability of exceedance for Flat Ice Accumulation (FRAM) | ||||
Weighting/Calculation: | |||||||
ProbIce48 | x | x | 48-hour threshold probability of exceedance for Flat Ice Accumulation (FRAM) | ||||
Weighting/Calculation: | |||||||
ProbIce72 | x | x | 72-hour threshold probability of exceedance for Flat Ice Accumulation (FRAM) | ||||
Weighting/Calculation: | |||||||
Snow or Sleet > 0.25 in Liquid Equiv | x | 24-hour probability of liquid equivalent of melted snow and sleet exceeding 0.25 in | |||||
Weighting/Calculation: | |||||||
PRECIPIATION TYPE (PTYPE) | |||||||
PType | x | x | Probability of Snow, Rain, Sleet, or Freezing Rain (instantaneous top of hour) | ||||
Weighting/Calculation: | |||||||
Snow Ratio | x | x | Snow to Liquid Ratio (using combination of Cobb, Roebber, MaxTaloft, thickness) | ||||
Weighting/Calculation: | |||||||
Snow Level | x | x | x | x | Elevation where the wet bulb temperature reaches 0.5 degrees C | ||
Weighting/Calculation:CONUS Alaska Puerto Rico Hawaii Guam Oceanic | |||||||
PctSnow Ratio | x | x | Snow to Liquid Ratio there is a given percent chance of being at or below (ex: p75 = 75% chance the SLR is the given number or less) | ||||
Weighting/Calculation: | |||||||
PctSnow Level | x | x | x | Snow Level elevation there is a given percent chance of being at or below (ex: p75 = 75% chance the Snow Level is the given elevation or less) | |||
Weighting/Calculation: |
NBM V4.2 MARINE WEATHER ELEMENTS
Marine Weather Elements | CO | AK | PR | HI | GU | OC | Definition |
---|---|---|---|---|---|---|---|
WATER | |||||||
WaveHgt | x | x | x | x | x | x | Significant Wave Height |
WaveHgtSD | x | x | x | x | x | x | Significant Wave Height Standard Deviation (SD) |
Weighting/Calculation: | |||||||
PctWaveHgt | x | x | x | x | x | x | 10/50/90 percentile of Significant Wave Height |
Weighting/Calculation: | |||||||
SST | x | x | x | Top of the hour Sea Surface Temperature | |||
Frzg Spray | x | x | x | Categorical Freezing Spray potential | |||
Weighting/Calculation: | |||||||
Ice Coverage | x | Percent Sea Ice Coverage inside gridbox | |||||
Weighting/Calculation:CONUS Alaska Puerto Rico Hawaii Guam Oceanic | |||||||
Ice Thickness | x | Sea Ice Thickness | |||||
Weighting/Calculation:CONUS Alaska Puerto Rico Hawaii Guam Oceanic | |||||||
WIND | |||||||
Tropical Speed | x | x | x | x | x | x | Tropical Cyclone Wind Speed forecast feature matched over NBM wind speed background |
Weighting/Calculation:
| |||||||
Tropical Direction | x | x | x | x | x | x | Tropical Cyclone Wind Direction forecast feature matched over NBM wind speed background |
Weighting/Calculation:
|
NBM V4.2 UPPER AIR WEATHER ELEMENTS
Upper Air Elements | 250mb | 500mb | 700mb | 850mb | 925mb | Definition |
---|---|---|---|---|---|---|
Temperature | x | x | x | x | x | 00Z & 12Z forecasts. 6-hourly through 384. |
Weighting/Calculation: | ||||||
Pressure Height | x | x | x | x | x | 00Z & 12Z forecasts. 6-hourly through 384. |
Weighting/Calculation: | ||||||
Rel Humidity | x | x | x | x | x | 00Z & 12Z forecasts. 6-hourly through 384. |
Weighting/Calculation: | ||||||
Wind Speed | x | x | x | x | x | 00Z & 12Z forecasts. 6-hourly through 384. |
Weighting/Calculation: | ||||||
Wind Direction | x | x | x | x | x | 00Z & 12Z forecasts. 6-hourly through 384. |
Weighting/Calculation:250 mb 500 mb 700 mb 850 mb 925 mb | ||||||
Height Standard Deviation | x | x | Standard deviation (SD) at 500mb and 700mb heights. 00Z & 12Z forecasts. 6-hourly through 384 | |||
Weighting/Calculation: |