ASCII Forecast Page

Forecast for the domain bounded by roughly 32-38 degrees north and 72-79 degrees west:

Current conditions over the domain do not meet ASCII criteria.

Page updated: Wed Feb 10 05:25:07 GMT 2010

Interpreting ASCII's Forecast
(meanings of the four possible forecasts)

If ASCII says	It means
Current conditions over the domain do not meet ASCII criteria.	There has not been a NW flow event of at least 12 hours duration during the past 48 hours.
The bomb index indicates that a storm in the domain is likely to bomb.	The Pre-Storm Baroclinic (PSBI) index exceeds 1.7° C/10 KM. The rate of intensification expected during the bomb's most rapid intensification period (RIP) will be given in MB/12 hours. The RIP typically lasts from 6-12 hours and represents the period of the bombing phase during which a low intensifies at its most rapid rate.
The bomb index is indeterminate.	The PSBI ranges from about 1.0° to 1.7° C/10 KM. The expected deepening rate of a cyclone in the domain will be given in MB/12 hours.
The bomb index indicates that a storm in the domain is NOTlikely to bomb.	The PSBI is less than 1.0° C/10 KM. The expected deepening rate of a cyclone in the domain will be given in MB/12 hours.

Caveats about using ASCII

ASCII does not forecast cyclogenesis nor does it provide track information. ASCII simply forecasts how much deepening can be expected if a cyclone passes through the domain.

ASCII was developed for cold (cool) air outbreaks (CAO) with at least 12 hours of northwest flow.

During the fall, artificially high PSBI values (and spurious bomb forecasts) are possible due to the relative warmth of the shelf waters. If a CAO has recently occurred, the ASCII PSBI and bomb forecast should be representative of the baroclinicity present off the coast.

ASCII was developed without respect to dynamics. However, upper level conditions must be supportive of cyclone development for ASCII's forecast's to be considered valid.

ASCII Main Page

ASCII Overview

ASCII Training

ASCII Forecast Page

Interpreting ASCII's Forecast(meanings of the four possible forecasts)

Caveats about using ASCII

Interpreting ASCII's Forecast
(meanings of the four possible forecasts)