@ostfilinchen And you’re certain the warning isn’t present in the wunderground payload?
Mine shows three because the payload has three warnings:

"alerts": [
{
"type": "WND",
"wtype_meteoalarm": "1",
"wtype_meteoalarm_name": "Wind",
"level_meteoalarm": "2",
"level_meteoalarm_name": "Yellow",
"level_meteoalarm_description": "The weather is potentially dangerous. The weather phenomena that have been forecast are not unusual, but be attentive if you intend to practice activities exposed to meteorological risks. Keep informed about the expected meteorological conditions and do not take any avoidable risk.",
"description": "Severe gusts of 80-90 km/h.BE AWARE of debris being blown around. Localised outdoor activity disruption is possible due to debris.>",
"date": "1970-01-01 00:00:00 GMT",
"date_epoch": "NA",
"expires": "2017-02-23 23:59:00 GMT",
"expires_epoch": "NA",
"message": "Severe gusts of 80-90 km/h.BE AWARE of debris being blown around. Localised outdoor activity disruption is possible due to debris.>)",
"phenomena": "NA",
"significance": "NA",
"attribution": "Information provided by , <a href='http://meteoalarm.eu/'>EUMETNET - MeteoAlarm</a> Note: Time delays between this website and <a href='http://meteoalarm.eu/'>Meteoalarm.eu</a> are possible. For the most up-to-date information about alert levels as published by the participating National Meteorological Services, please visit <a href='http://meteoalarm.eu/'>Meteoalarm</a>. For terms of use of this information, and copyright information, see <a href='http://meteoalarm.eu/'>Meteoalarm</a> Terms of Use."
}
,
{
"type": "WIN",
"wtype_meteoalarm": "2",
"wtype_meteoalarm_name": "Snow/Ice",
"level_meteoalarm": "2",
"level_meteoalarm_name": "Yellow",
"level_meteoalarm_description": "The weather is potentially dangerous. The weather phenomena that have been forecast are not unusual, but be attentive if you intend to practice activities exposed to meteorological risks. Keep informed about the expected meteorological conditions and do not take any avoidable risk.",
"description": "Potential disruption due to snow and ice from 6AM CET SAT until 8:59AM CET SAT",
"date": "2017-02-25 06:28:03 GMT",
"date_epoch": "NA",
"expires": "2017-02-25 07:59:00 GMT",
"expires_epoch": "NA",
"message": "Potential disruption due to snow and ice from 6AM CET SAT until 8:59AM CET SAT)",
"phenomena": "NA",
"significance": "NA",
"attribution": "Information provided by , <a href='http://meteoalarm.eu/'>EUMETNET - MeteoAlarm</a> Note: Time delays between this website and <a href='http://meteoalarm.eu/'>Meteoalarm.eu</a> are possible. For the most up-to-date information about alert levels as published by the participating National Meteorological Services, please visit <a href='http://meteoalarm.eu/'>Meteoalarm</a>. For terms of use of this information, and copyright information, see <a href='http://meteoalarm.eu/'>Meteoalarm</a> Terms of Use."
}
,
{
"type": "WRN",
"wtype_meteoalarm": "3",
"wtype_meteoalarm_name": "Thunderstorms",
"level_meteoalarm": "2",
"level_meteoalarm_name": "Yellow",
"level_meteoalarm_description": "The weather is potentially dangerous. The weather phenomena that have been forecast are not unusual, but be attentive if you intend to practice activities exposed to meteorological risks. Keep informed about the expected meteorological conditions and do not take any avoidable risk.",
"description": "Potential disruption due to thunderstorms from 4PM CET MON until 9:59PM CET MON",
"date": "2017-02-27 11:46:02 GMT",
"date_epoch": "NA",
"expires": "2017-02-27 20:59:00 GMT",
"expires_epoch": "NA",
"message": "Potential disruption due to thunderstorms from 4PM CET MON until 9:59PM CET MON)",
"phenomena": "NA",
"significance": "NA",
"attribution": "Information provided by , <a href='http://meteoalarm.eu/'>EUMETNET - MeteoAlarm</a> Note: Time delays between this website and <a href='http://meteoalarm.eu/'>Meteoalarm.eu</a> are possible. For the most up-to-date information about alert levels as published by the participating National Meteorological Services, please visit <a href='http://meteoalarm.eu/'>Meteoalarm</a>. For terms of use of this information, and copyright information, see <a href='http://meteoalarm.eu/'>Meteoalarm</a> Terms of Use."
}
]