Snipet from HGX afternoon AFD...
FXUS64 KHGX 162130
AFDHGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
330 PM CST SUN DEC 16 2007
.DISCUSSION...
FORECAST IS FOR THE COLDEST NIGHT OF THIS LATE AUTUMN SEASON.RECENT SURFACE ANALYSIS SHOWING A SLOWLY WEAKENING...NE DRIFTING
NEAR-1030 MB HIGH CENTERED NEAR VCT. HIGH IS EXPECTED TO CONTINUE
THIS SLOW NORTHEASTERN TRACK AND BE OVER THE CWA SHORTLY AFTER
SUNSET. THIS WILL KILL ANY GRADIENT AND ALLOW ONCE-POWERFUL NORTH
WINDS TO GO CALM. DRY INLAND AIR MASS WITH DEW POINTS IN THE LOWER
TO MIDDLE 20S WILL EFFICIENTLY ALLOW SURFACE WARMTH TO RADIATE
AWAY. TEMPERATURES WILL BE AT...OR SLIGHTLY UNDER...32F FOR A
PERIOD OF BETWEEN 6 TO 8 HOURS. FAR NORTHERN REACHES OF THE CWA
MAY HIT THE MID 20S FOR AN AN HOUR OR TWO NEAR SUNRISE. REASONING
IS A THAT NEAR-20F DEW POINT AIR MAY FILTER OVER A BRAZOS TO
HOUSTON COUNTY LINE WHEN WIND DIES...SETTING UP BETTER RADIATIVE
COOLING.
WILL NOT ISSUE A FREEZE WARNING AS THIS IS NOT THE FIRST
FREEZE OF THE SEASON FOR MANY INTERIOR AREAS (FIRST OCCURRED ON THE
MORNING OF 12/4)...HARD FREEZE CRITERIA WILL DEFINITELY NOT BE MEET.http://www.srh.noaa.gov/productview.php?pil=HGXAFDHGX