**Is wind directional change with height less
than 30 ° from surface to 850 millibars and
less than 60 ° from the surface to 700 millibars?** |
**Question#1** |

**Is the average lake water temperature greater
than 13° C more than the 850 mb
temperature AND is lake unfrozen?** |
**Question#2** |

**Is the height of the inversion (depth of arctic air)
above the 700 millibar level?** |
**Question#3** |

**Is the average PBL windspeed between
10 mph and 45 mph?** |
**Question#4** |

**Is the fetch of wind over the lake greater
than 100 kilometers?** |
**Question#5** |

**Does significant orographic lifting occur
downwind from the lake?** |
**Question#6** |

**Is the average PBL temperature below freezing** |
**Question#7** |