Issued 10th of January 2019
Situation and medium-term forecast
First hazel trees and shrubs may pollinate on thermic favoured sites!
First hazels possess the capacity to pollinate on thermic favoured sites. This concerns especially the lowlands and sun exposed areas. The majority of hazel is not yet ready to flower (see forecast dates).
Additionally, the weather does not always provide favourable conditions for pollination this week: “Early starter hazels” pollinate only during dry periods and temperatures of about 5°C. The readiness to flower is generally expected in about two weeks from a current point of view.
The native alder species will attain their readiness to flower soon together with hazel.
A special alder species, Spaeth´s alder, may still flower in some places. This species is known for its flower around Christmas time and occurs only where it was planted. A burden has to be expected locally in proximity to these planted trees or during favourable wind constellations for sensitive alder pollen allergy sufferers. Pollination is possible on days with low positive temperatures.
Relevant pollination has to be expected only locally.
|We expect the readiness to flower for hazel in||on|
|Bozen||ready to flower|
Forecast from 16.01.2019
Note: The model results give an indication of the expected start of flowering, based on information provided by local pollen warning services with direct reference to the local situation. Start of flowering is not to be equated with the beginning of the pollen season. When the start of flowering is achieved, the majority of the plants have the potential to release pollen, but only when weather conditions are favourable.
Responsible for the content:
pollenwarndienst.at and the Department of Oto-Rhino-Laryngology of the Medical University Vienna, Research group aerobiology and pollen information
Uwe E. Berger MBA und Mag. Dr. Katharina Bastl
medium-term forecast based on model and pollen data from Austria and surrounding countries
weather data and today´s forecasts based synoptic data: ZAMG (Zentralanstalt für Meteorologie und Geodynamik)