National Weather Service United States Department of Commerce

Dangerous Heat and Heavy Rainfall into the Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend. Heat Advisories remain in effect. Heavy to excessive rainfall occurring at times through the weekend could bring areas of flooding to parts of the northern Rockies, upper Midwest, central Great Lakes, and southern New England. Read More >

Integrated Dissemination Program

National Headquarters

MRMS v12.3 Supplemental

Weather.gov > Integrated Dissemination Program > MRMS v12.3 Supplemental

Multi-Radar Multi-Sensor (MRMS) v12.3.0

 

ProbSevere version 3

  • Every two minutes, the ProbSevere (PS) model outputs a geoJSON containing a collection of features, each of which contains a polygon, the ProbSevere, ProbTor, ProbHail, and ProbWind probabilities, and associated environmental information (“properties”). In MRMS v12.3, PS is being upgraded from Version 2 (PSv2) to Version 3 (PSv3). PSv3 features contain different environmental information than PSv2 features did.
  • PSv2 geoJSONs are available from https://mrms.ncep.noaa.gov/ProbSevere/PROBSEVERE.
  • During testing, PSv3 geoJSONs will be available from https://mrms-qa.ncep.noaa.gov/ProbSevere/PROBSEVERE.

 

{feature number} -> models -> probsevere

 

  • The following table compares the names of each of the environmental parameters listed in the ‘probsevere’ portion of each PS feature across versions 2 and 3:

Key

PSv2 value

PSv3 value

PROB

{ProbSevere probability}

{ProbSevere probability}

LINE01

ProbHail; ProbWind; ProbTor

ProbSevere; ProbHail; ProbWind; ProbTor

LINE02

MESH

MESH; VIL

LINE03

VIL Density

ENI Flash Rate

LINE04

Flash Rate

ENI Flash Density

LINE05

Flash Density (max in last 30 min)

Max LLAzShear

LINE06

Max LLAzShear

98% LLAzShear

LINE07

98% LLAzShear

98% MLAzShear

LINE08

98% MLAzShear

Norm. vert. growth rate

LINE09

Norm. vert. growth rate

EBShear; SRH 0-1km

LINE10

EBShear; SRH 0-1km AGL

MeanWind 1-3km

LINE11

MUCAPE; MLCAPE; MLCIN

LR 0-3km; Max LR 2-6km

LINE12

MeanWind 1-3kmAGL

MUCAPE; MLCAPE; MLCIN

LINE13

Wetbulb 0C hgt

Wetbulb 0C hgt; PWAT

LINE14

CAPE -10C to -30C; PWAT

GLM: max FED; sum FCD

LINE15

Avg. beam height (ARL)

GLM: max TOE; min flash area

Table 1. Comparison of ‘probsevere’ components of PS features between versions 2 and 3.

 

{feature number} -> models -> probtor

 

  • There are no changes to the ‘probtor’ section of ProbSevere features in this release.

 

{feature number} -> models -> probhail

 

  • There are no changes to the ‘probhail’ section of ProbSevere features in this release.

 

{feature number} -> models -> probwind

 

  • The following table compares the names of each of the environmental parameters listed in the ‘probwind’ portion of each PS feature across versions 2 and 3:

Key

PSv2 value

PSv3 value

PROB

{ProbWind probability}

{ProbWind probability}

LINE01

ProbWind

ProbWind

LINE02

MESH

MESH

LINE03

VIL Density

Flash Rate

LINE04

Flash Rate

98% LLAzShear

LINE05

98% LLAzShear

98% MLAzShear

LINE06

98% MLAzShear

Norm. vert. growth rate

LINE07

Norm. vert. growth rate

EBShear

LINE08

EBShear

MeanWind 1-3kmAGL

LINE09

MeanWind 1-3kmAGL

MUCAPE; MLCAPE

LINE10

MUCAPE; MLCAPE

[no LINE10 in PSv3]

Table 2. Comparison of ‘probwind’ components of PS features between versions 2 and 3.

 

{feature number} -> properties

 

  • The “VIL_DENSITY”, “MAXRC_ICECF”, and “PS” attributes from ProbSevere v2 are removed in v3 and the format of “AVG_BEAM_HGT” is modified. Several new attributes are included in the “properties” section of each ProbSevere v3 object. Removed attributes are indicated with strikethrough and new attributes are highlighted in green in the below example object:

 

"properties": {

        "MaxFED": "8",

        "MaxFCD": "2",

        "AccumFCD": "10",

        "MaxTE": "28",

        "MinFlashArea": "80",

        "TE@MaxFCD": "12",

        "AvgGroupArea": "277",

        "MUCAPE": "948",

        "MLCAPE": "428",

        "MLCIN": "-6",

        "EBSHEAR": "22",

        "SRH01KM": "52",

        "MEANWIND_1-3kmAGL": "14",

        "COMPREF": "62.0",

        "REF20": "60",

        "REF10": "62",

        "MESH": "1.29",

"VIL_DENSITY": "1.54",

        "H50_Above_0C": "6.2",

        "EchoTop_50": "4.0",

        "VIL": "34",

        "FLASH_RATE": "13",

        "FLASH_DENSITY": "0.25",

        "MAXLLAZ": "0.008",

        "P98LLAZ": "0.007",

        "P98MLAZ": "0.006",

        "MAXRC_EMISS": "0",

"MAXRC_ICECF": "N/A",

        "ICP": "70",

        "WETBULB_0C_HGT": "6.2",

        "PWAT": "0.8",

        "CAPE_M10M30": "323",

        "LLLR": "8.9",

        "MLLR": "7.6",

        "DCAPE": "472",

        "SRW02KM": "17.4",

        "SRW46KM": "23.6",

        "LCL": "1149",

        "LJA": "0.1",

        "MLAT": "46.65",

        "MLON": "-110",

        "SIZE": "221",

"AVG_BEAM_HGT": "1.17 kft / 0.36 km",

        "AVG_BEAM_HGT": "8.4",

        "MOTION_EAST": "9.1",

        "MOTION_SOUTH": "0",

        "ProbSevere": "30",

        "ProbHail": "30",

        "ProbWind": "3",

        "ProbTor": "3",

"PS": "9",

        "ID": "27"

}