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Skywarn - Serviceplan

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The Dutch Skywarn section is set up to be an open and transparant organisation; "everyone" can participate and receive data and trainingmaterials:


  • Partnersites: Selected websites Skywarn-spotters can logon to with their Skywarn-credentials and post reports.
  • Premium clients: meteo-organisations and -parties with direct access to the Skywarn reports. This wil only be offered to professional organisations that will be contacted by Skywarn as described in our Mission statement.
    Please note that Skywarn NL actively monitors the quality of submitted extreme weather reports.
  • All other: data-exports can be requested (CSV files, for available data see below) and observations may be displayed on any website (RSS-feed available).


For more information please contact the persons mentioned on the home-page.

Access to the servicedatabase

Partnersites and registered premium clients receive login-data for direct access to the (MySQL) servicedatabase in order to post and/or receive recent observations. 

Available data (via MySQL view)

Field  Type Description
swextobs_oid* char(20) Unique id of the observation. This id can be used to contact the observer (via Skywarn Nederland).
swextobs_scl char(1) Class of the observer:
1 = Entry-level, 2 = Certified, 3 = Professional/expert.
swextobs_dat* datetime Date and time of the observation in local NL time (GMT+1) with summer-/wintertime applied. Format yyyy-mm-dd hh:mm:ss.
swextobs_utc* datetime UTC date and time of the obervation, format yyyy-mm-dd hh:mm:ss
swextobs_prc char(2) Precision of the given time of observation:
05 = +/- 5 minutes (default);
15 = +/- 15 minutes;
30 = +/- 30 minutes.
swextobs_phnid* tinyint(4) unsigned Id of the reported extreme weather phenomenon, please see "encoding and selection of phenomena, countries and languages" for more info.
swextobs_phndsc* char(45) Description of the reported extreme weather phenomenon.
swextobs_ovr char(1) Only if funnelcloud or tornado's are reported, observed over:
n = n/a (default), o = unknown, l = land, w = water (waterspout).
swextobs_dir char(6) In which direction the event was seen, for example:
'n/a' =not applicable or on location (default);
NE =northeast;
SSW =southsouthwest, etc.
swextobs_dst char(7) Distance to the observed event,  only if applicable and known:
'n/a' =not applicable or on the spot, default;
1-5km = less than 5km;
5-10km = 5 to 10km, etc.
swextobs_dsc varchar(384) Further description of the event, e.g. indication of strength or any other relevant details. Input is not required.
swextobs_lat* char(12) Lattitude position observer, decimal point, max. 8 decimals.
swextobs_lon* char(13) Longitude position observer, decimal point, max. 8 decimals.
swextobs_loc1* char(50) Name of the town or place as given in Google geolocation "locality".
swextobs_loc2* char(4) Name of the region or district as given in Google geolocation  "administrative_area_level_1" abbrevated to 4 positions. For example:
Vlaams Gewest - Vlaa
swextobs_loc3* char(3) Country-id as given in Google geolocation "country", for example:
NL = Nederland, DE = Deutschland, etc.
swextobs_stsid tinyint(2) unsigned Id of the reportstatus, default 1 = "as received".
swextobs_stsdsc char(20) Description reportstatus.
swextobs_org char(4) Id of the (partner-)site that received the report, default  SWNL = Skywarn Nederland.
swextobs_evt datetime Date on which damage occurred, only relevant in case of damage reports. The date on which the damage was observed may differ from the date the damage was caused. Format yyyy-mm-dd.
swextobs_edt datetime Date and time the report was last edited, format yyyy-mm-dd hh:mm:ss in lokale tijd (GMT+1) and summer-/wintertime applied.
* = these data can not be changed once a report is submitted.

Encoding and selection of phenomena, countries and languages.

Extreme weather report properties are encoded in de Skywarn databases as shown below. Per organisation is tagged which data are relevant (SWNL = Skywarn Nederland).

Premium clients: log on to this page with the account you received for database-access to see your current selection.


Id Event SWNL
10Dense fog (sight < 100mtrs)
2Funnel / Tuba (>10% distance cloud-surface)
5Large hail (stones and/or deck at least 20mm)
17Heat I - Temperature >= 35°C
18Heat II - Heat Index >= 35°C
1Spout / Tornado (touchdown observed)
12Glaze(d frost) or sleet
13Thunderstorm light/moderate
9Thunderstorm, heavy (at least 60 strikes/min.)
7Damage/damage survey
16Snow, light - moderate
11Snow, heavy (sight <200mtr)
15Dust devil
19Windchill - perceived temperature < -20°C
6Heavy rain/downpour
4Heavy wind (at least 90 km/u)


Id Country SWNL
FRla France
UKUnited Kingdom


Id Language SWNL


Which phenomena are selected will be determined in consultation with the client organisation. Should it be necessary to change the selection contact the persons mentioned on the home-page.


Premium clients and partnersites will receive a databaseaccount for direct access to the submitted reports. To ensure proper performance for all participating parties the allowed number of queries is limited, typically 60 per hour (so reports can be read and/or transfered each minute). To ensure ease of transfer and usefulness recent reports will be offered partly denormalized in a custom-made view per client. Best practice: we advise to save the records at once in a (temporary?) table in your own database environment for further processing or use. To create such table, e.g. "tblSWTemp", a databasescript is available, see the downloads below.


Depending on which further use is foreseen records could be used directly from the aformentioned table or, should archiving be desired, be converted to your own database-format. You can use fields swextobs_oid and swextobs_edt to determine which records are new and which records to update in case reports are changed.


If you want to archive reports in the Skywarn database definition you can use the scripts in swtables.zip to create and populate the subtables. This is advisable because is enables you to (re-)normalize the data. Or download only the data as .CSV files as given in swsvcdata.zip.
In this scenario you can choose to simply overwrite existing records or update records in case corresponding reports have been changed.


  • tblswtemp.zip
    (MySQL) Statement to create the aforementioned table tblSWTemp. If MySQL is being used make sure you have a recent version like 5.x.
  • swtables.zip
    Statements to create the additional tables containing phenomena, reportstatus and directions. For use with MySQL, but can be used for other DBMS's with minor modifications.
  • swcsvdata.zip
    Data only in .CSV format.


* From 02:00z to 04:00z backups en database maintenance jobs are running with possible impact on response times. Note: in very rare cases (if one of the "constant" values would need to be changed) your database-query may not return any, or not all, records during maintenance.


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