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WINTER FOG EXPERIMENT (WiFEX)
INDIAN INSTITUTE OF TROPICAL METEOROLOGY, PUNE, INDIA
भारतीय उष्णदेशीय मौसम विज्ञान संस्थान, पुणे, भारत
Ministry of Earth Sciences, Govt. of India

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Visibility Forecast
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Observation
Near Realtime Observation At Delhi
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Forecast
Fog Forecast
Bulletin & Message

 Winter Fog Experiment Forecast (2020-21): 

WIFEX Forecast based on 00Z 26th Jan 2021.

1.       WRF-(4km) 5-member physics ensemble indicates fog over Delhi and IGI airport.

2.        21 member ensemble probability forecast for Delhi shows above 80% probability of fog in CAT 3A category during the early morning hours. 

 IMD FDP Bulletin on fog forecast for 27th January 2021: 

 

  • Considering low level winds, Relative humidity, temperature inversion between 1000-925 hPa & minimum temperature and guidance from different models i.e. NCUM, GFS & ECMWF, current spell of Dense to Very Dense Fog in isolated/some pockets likely to prevail over Punjab and Uttar Pradesh during next 2 days and decrease thereafter becoming isolated Dense Fog over these areas.

  • Under the influence of dense fog/low cloud conditions, Severe Cold Day conditions are very likely in some pockets over Uttar Pradesh during next 2 days and significant decrease thereafter.

  • Isolated Cold Wave/Cold Day and Dense to Very Dense Fog conditions very likely over Madhya Pradesh during next 2-3 days.

  • Isolated Dense Fog conditions are very likely over Bihar, Sub-Himalayan West Bengal, Assam & Meghalaya and Nagaland, Manipur, Mizoram & Tripura during next 3 days.

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Mid Visibility IGIA
Forecast
Current AQI
X

Visibility Range

CAT - IIIC

VISIBILITY: Below 50 M
CAT - IIIB

VISIBILITY: FROM 50M TO 174M
CAT - IIIA

VISIBILITY: FROM 175M TO 299M

CAT - II

VISIBILITY: FROM 300M TO 549M

CAT -I

VISIBILITY: 500M AND ABOVE

X

Air Quality Index Range

Good

AQI: Good (0 - 50)
Air quality is considered satisfactory, and air pollution poses little or no risk.

Satisfactory

AQI: Satisfactory (51 - 100)
Air quality is considered satisfactory, and air pollution poses little or no risk.

Moderate

AQI: Moderate (101 - 200)
Air quality is acceptable; however, for some pollutants there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.

Poor

AQI: Poor for Sensitive Groups (201 - 300)
Although general public is not likely to be affected at this AQI range, people with lung disease, older adults and children are at a greater risk from exposure to ozone, whereas persons with heart and lung disease, older adults and children are at greater risk from the presence of particles in the air.

Very Poor

AQI: Very Poor (301 - 400)
Health alert: everyone may experience more serious health effects.

Severe

AQI: Severe (401 - 500)
Health warnings of emergency conditions. The entire population is more likely to be affected.

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