Setting expectations for rainfall later today, and on Christmas Eve

Good morning. I sincerely hope this holiday weekend finds you healthy, happy, and well. This Saturday morning weather update is intended to get you up to speed on what to expect for now through Christmas Day.

Saturday

We’re starting the morning out with mild conditions—temperatures in the 60s, moderate humidity, and lots of cloud cover. We’re not going to see much, if any sunshine today, and the clouds will help corral high temperatures to around 70 degrees. I also think we’ll remain rain free for most of today, with only the potential for some scattered, light showers through the afternoon hours.

However, by late this afternoon or by around sunset, we should see the development of showers and thunderstorms to the south and southwest of Houston, pushing into the metro area. This may put a damper on outdoor activities this evening. The bulk of this system should move through Houston by the early morning hours of Sunday.

After that? We may see a break until a second round of storms on Sunday. I think this is the most likely scenario for inland areas. However, areas closer to the coast and south of Interstate 10 may see additional showers and thunderstorms developing through Sunday morning. Lows tonight will only drop into the low 60s for most.

Potential for excessive rainfall in the Houston area on Saturday night and Sunday morning. (NOAA)

Christmas Eve

As noted above we’re going to continue to see the potential for scattered showers on Sunday morning, with the possibility of thunderstorms. By mid- or late-morning we should see a more organized system—probably a line of showers, but maybe just a congealed mass—move in from the west ahead of the cold front. These showers will work their way through Houston during the afternoon hours before finally clearing to the east by around sunset, give or take a couple of hours. I don’t anticipate significant flooding, and at this time we’re not going to declare a Stage 1 flood alert. However, conditions during the daytime on Sunday will at times be messy, and you’ll need to be wary of the potential for thunderstorms. Take care if you’re going to be out and about. Most locations will pick up 1 to 3 inches of rainfall, but there is the potential for isolated areas to see greater totals.

Temperature wise, Christmas Eve will feel fairly muggy, with highs around 70 degrees. Lows, in the wake of the front, will drop into the 50s overnight.

Christmas Day and beyond

Christmas Day, itself, brings no concerns about severe weather. We’re going to see mostly sunny skies, with highs perhaps holding in the upper 50s. With a northerly breeze it will feel rather brisk. Lows on Christmas night will fall down to around 40 in Houston, with cooler conditions for inland areas.

Most of next week looks sunny and cold, with highs in the 50s to maybe 60 degrees, and lows in the 30s and 40s. It’s probably not going to freeze in the Houston metro area, but winter is definitely going to stick around for awhile.

Unless the precipitation forecast takes a turn for the worst—and yes, I’ll be watching—this will be our last update until Tuesday, December 26. I hope everyone has a very Merry Christmas and a happy holiday season.

For Christmas this year Mother Nature is giving Houston the gift of winter

Good morning. Sorry for the late update this morning, but sometimes life intervenes. Fortunately, the forecast remains more or less on track. The region will enter a wetter period now through Sunday, with some heavy rainfall possible on Christmas Eve ahead of a cold front. After the front moves through we should see clear and much cooler weather for Christmas Day and the holiday weekend leading up to New Year’s Eve.

One quick programming note: Given the dynamic weather possible on Sunday, expect at least one update this weekend to make sure you’re on top of the forecast.

Friday

Today should be fine for any last-minute shopping or other activities related to the holiday weekend. Yes, we could see some (mostly) light showers, but I don’t think they’ll be anything more than a nuisance. Skies will, otherwise, be gray with high temperatures reaching about 70 degrees or a tick higher. Winds will be light, from the east. Lows tonight will only drop into the low 60s, for the most part. As we saw some fog this morning, you can probably expect more of the same on Saturday morning.

NOAA rain accumulation forecast for now through Christmas Day. (Weather Bell)

Saturday

Saturday will be similar to Friday with one exception: Rain showers will be a little more widespread, with a better chance at some moderate rainfall. I still don’t expect anything too heavy, as that’s more likely to occur on Christmas Eve. Otherwise it will be another soupy day, with highs in the vicinity of 70 degrees, and a not very cool night in the low 60s.

Sunday

You’ll probably have noticed that it feels more humid outside this morning. Well, after a couple of days of an easterly breeze we’re going to see a lot of moisture in the atmosphere, and that’s a starter dough for rainfall. By Sunday we’ll add in a forcing function in the form of an advancing front. In terms of timing, I expect most of the rain to occur during the midday or early afternoon hours, as a line of storms advances from west to east across the region. Most of us should pick up 1 to 2 inches of rain, but there could be higher isolated totals that lead to some brief street flooding. Right now the overall dynamics in the atmosphere don’t favor severe weather, but I’m keeping tabs on that. Hopefully this mess will clear out by the late afternoon or evening. Lows on Sunday night will drop to around 50 degrees.

Christmas Day

The holiday should be bright and sunny, with highs of perhaps 60 degrees. Winds will be a bit gusty, from the north, perhaps at 20 to 25 mph. So that will add a bit of chill to the air. Lows on Monday night drop into the low 40s for most.

Here comes winter, Houston. (Weather Bell)

Next week

We’re looking at fairly typical winter weather, with mostly sunny skies, highs perhaps in the low 60s, and nights generally in the 30s and 40s. It will be a good time to wear those sweaters you got for Christmas. As for New Year’s Eve, it’s very early. I can’t rule out some rain showers, but there’s no particularly strong signal for that. It does look chilly, however.

After a wet and messy Christmas Eve, we clear out for Christmas Day

Good morning. We finally have clarity on the forecast for the Christmas holiday, and the short version is that this weekend looks messy, but Christmas Day should be partly sunny, dry, and seasonal with highs in the 60s. Before that, however, we’re likely to see a wet weekend with widespread accumulations of 1 to 3 inches, and even higher isolated totals.

Thursday

Temperatures have only fallen to 60 degrees this morning, and this will probably be the ‘coldest’ we get until after the next front rolls through on Christmas Eve. This will also be the last day we can be reasonably confident that it won’t rain until Christmas Day. Skies will be mostly cloudy, however, with highs in the upper 60s to 70 degrees. Winds will be out of the east at around 10 mph, with higher gusts. I can’t entirely rule out some very light showers today, but most of us should stay dry. That could change this evening, and during the overnight hours, when some light, misty rain will be a bit more likely. Lows drop to around 60 degrees again in Houston, with cooler conditions further inland.

Precipitable water levels will be 175 to 300 percent of normal on Sunday morning. So yeah, it’s gonna rain. (Weather Bell)

Friday and Saturday

These will be similar days, with highs of around 70 degrees, and decently high humidity. Both days will be cloudy with rain chances on the order of 50 to 70 percent. The overall dynamics for both days don’t favor severe weather, so we’re likely looking at some on-and-off, mostly light to moderate rain showers. If you’re going to be out and about, conditions should be fine, just know there may well be some nuisance showers.

Christmas Eve

The story is a little bit different for Sunday. As a front approaches we’re going to see atmospheric lift, which spells R-A-I-N given the ample moisture available in the atmosphere. Pretty much everyone is going to get some rain on Sunday, but the amounts will be variable, with some areas perhaps getting 0.5 to 1 inch, and others 3 to 5 inches. I think the latter totals will be fairly isolated, but the setup does favor some heavy rainfall.

Fortunately the conditions won’t be quite right for severe weather, so while there may be some thunderstorms, the odds of them turning intense—with damaging hail and winds—is fairly low. Highs on Christmas Eve will be about 70 degrees. I’m thinking we’ll see a frontal passage at some point during the evening hours, or so, with drier air moving in overnight behind the front. Once the front pushes in you can be pretty confident the rain showers are over.

Sunrise temperatures on Christmas morning. (Weather Bell)

Christmas Day

Depending on when the front goes through, most of us should be waking up to temperatures in the 50s, with clearing skies. Northerly winds will be gusting to about 20 mph, but it doesn’t look like one of those howling, wild blue norther fronts. Highs will be seasonable, in the mid-60s. Lows on Christmas night will drop into the 40s. So all in all, it should be a pleasant Christmas Day weather-wise. It’s just that getting there that is going to be kind of messy.

Next week

At this point it looks as though we’re going to remain in the 60s for all of next week, with cool nights in the 40s. Skies will be sunny, and winds reasonably light. If you’ve been pining for a stretch of winter, you’re in luck!

Christmas Day forecast comes into better focus; a fallstreak hole over Houston

Good morning. Houston’s weather will now warm up through the weekend, with some healthy rain chances, before a cold front moves through late on Christmas Eve, or early on Christmas morning. This should bring cooler and drier weather into Houston for the holiday, and most of the week leading up to New Year’s Day.

Fallstreak hole seen near Spring on Tuesday. (Jaime Aguilar)

Before jumping into the forecast I wanted to share a photo from a reader, Jaime Aguilar, who lives near spring. Jaime took this photo on Tuesday morning while out for a walk. It shows a ‘fallstreak hole,’ a fairly rare meteorological phenomenon that occurs when water in clouds suddenly freeze, and falls. This is sometimes induced by a passing airplane. I thought others might have seen this, so I wanted to explain the phenomenon.

Wednesday

Temperatures are starting out in the 50s this morning, and they’ll rise to about 70 degrees today. We’ll see a mix of sunshine and clouds, as highs push up to about 70 degrees. Winds will be a bit more prominent, out of the east at 10 mph, with gusts up to about 20 mph. Lows tonight will only drop into the upper 50s in Houston.

Thursday

Thursday will be a similar day, albeit with a few more clouds. Lows on Thursday night will be a few degrees warmer than Wednesday night, and we may see a few scattered, light showers develop after midnight.

Friday, Saturday, and Sunday

The weekend will see generally cloudy skies, with a decent shot of humidity, and highs of around 70 degrees or a tick warmer. Rain showers over the weekend will be on-and-off again affairs. Sunday—Christmas Eve—should be the most dynamic day in terms of rainfall and thunderstorm potential as a front approaches the region. I don’t think things are going to get too extreme, as most of the region will likely see 1 to 3 inches of rain through the weekend, but it could be messy at times. Something to consider if you have plans for Christmas Eve.

Forecast high temperatures for Christmas Day in Houston. (Weather Bell)

Christmas Day

The good news is that, increasingly, it looks like the front will be pushed through Houston by Monday morning. This will reduce rain chances on the holiday to about 10 or 20 percent. I’d expect highs to reach the upper 60s with partly to mostly cloudy skies. Lows on Monday night will likely drop into the upper 40s as cooler and drier air moves in during the daytime.

Next week

Most of next week looks fairly pleasant and winter-like. Most probably we’re looking at days in the 60s, with lows in the 40s, and partly to mostly sunny skies.