Arcade expression error in Watch Center Velocity Analytic

Bryan_Wade — Thu, 27 Mar 2025 17:16:57 GMT

I am working on adding a River Gauge layer to the Watch Center Solution. I have my feed completed and am working on mapping the fields. I am using the Hurricane feed and hurricane fields to help me with the arcade expressions.

For the alert type field I am using this arcade:

When(

$feature.status == 'action', 'Action Stage',

$feature.status == 'minor', 'Minor Flood Stage',

$feature.status == 'moderate', 'Moderate Flood Stage',

$feature.status == 'major', 'Major Flood Stage')

This mimics the alerttype field used with the hurricane feed:

When(

$feature["STORMTYPE"] == 'TD', 'Tropical Depression',

$feature["STORMTYPE"] == 'TS', 'Tropical Storm',

$feature["STORMTYPE"] == 'HU', 'Hurricane',

$feature["STORMTYPE"] == 'DB', 'Disturbance',

$feature["STORMTYPE"] == 'STD', 'Subtropical Depression',

$feature["STORMTYPE"] == 'SS', 'Subtropical System',

$feature["STORMTYPE"] == 'STS', 'Subtropical System',

$feature["STORMTYPE"] == 'WV', 'Tropical Wave',

$feature["STORMTYPE"] == 'EX', 'Extratropical Storm',

'Typhoon')

I keep getting this error when I test the arcade expression - Test execution error: Compilation error - Line : 1, 0: Call with wrong number of parameters. Verify test data.

I get this error on the velocity side -

I would appreciate any thoughts or assistance as I try to figure out

Re: Arcade expression error in Watch Center Velocity Analytic

KenBuja — Thu, 27 Mar 2025 17:32:26 GMT

The first When statement is missing the DefaultValue

When( $feature.status == 'action', 'Action Stage', $feature.status == 'minor', 'Minor Flood Stage', $feature.status == 'moderate', 'Moderate Flood Stage', $feature.status == 'major', 'Major Flood Stage', 'N/A')

Re: Arcade expression error in Watch Center Velocity Analytic

Bryan_Wade — Thu, 27 Mar 2025 17:38:50 GMT

Thanks for the help! That did the trick. I'm new to using arcade and really appreciate the assistance

topic Re: Arcade expression error in Watch Center Velocity Analytic in ArcGIS Online Questions

Arcade expression error in Watch Center Velocity Analytic

Re: Arcade expression error in Watch Center Velocity Analytic

Re: Arcade expression error in Watch Center Velocity Analytic