There are "certain" migraines, you are correct.  But "barometric pressure migraine" is not, and never has been, a sub-category of a type of migraine, because changes in barometric pressures are a trigger event precipitating a migraine attack, and not a migraine attack in and of itself. I too am affected by the weather if the pressure begins to drop, but these migraines are no different than any of my other migraines, except for the ones cause by my menstrual period (and there is a specific moniker for these migraines, such as Pure Menstrual Migraine or Menstrually Related Migraine because they generally follow a specific pattern with hormone fluctuations and have a distinction as some of the most severe and harder-to-treat attacks).  However, every one experiences migraine in different ways and the ones triggered by weather may be different for you in that they are more severe and harder to control, but this does not make them a different category of migraine.   Just as certain foods, smells, light patterns, and other stimuli forces our nervous sytem to react and produce the brain storm that is migraine, the same can happen with weather.  It's a trigger, not a specific type of migraine, and can fall into the cetegories of Migraine with Aura (MWA) or Migraine without Aura.  Migraines triggered by weather may be harder to treat because weather is, of course, unpredictable.   If you are interested in seeing the classification of headache disorders as defined by the medical industry, see the following website:  http://ihs-classification.org/en/02_klassifikation/02_teil1/01.00.00_migraine.html   Migraine is the specific syndrome; barometric changes are the trigger event preceding the syndrome.