Monday, January 16, 2017

Potentially Stormy Week Ahead in Memphis

Is this winter or is this spring? With a chance of showers and thunderstorms throughout the week ahead and temperatures in the 50s and 60s, many are wondering where Mother Nature sent away winter to and when it might come back.

Severe Potential on Monday Night

Showers and a few thunderstorms have been rolling through northern Mississippi, Arkansas, and western Tennessee throughout the day on Monday, but will increase in number and intensity into Monday night. A slow-moving system that helped bring lots of ice and wintry conditions to the Central Plains is driving a Marginal Risk (category 1 of 5) for severe weather this evening, mainly along and west of the Mississippi River.

With a Marginal Risk (category 1 of 5) of severe weather this evening across the Memphis metro, be on the lookout for heavy downpours, thunder, and some strong winds on occasion. These storms should weaken by the overnight hours. (NWS/SPC)
The key takeaways from the threat of these storms will be locally heavy downpours, thunder, and brief strong wind gusts. Not every passing shower or thunderstorm will produce these, however. Showers may continue into the overnight hours and early on Tuesday, but the thunderstorm threat should abate by about midnight tonight. Temperatures this evening will fall off into the mid to upper 50s. Winds continue out of the south between 10 to 15 mph.

Continued Showers Possible

More showers and an isolated thunderstorm are possible throughout the rest of the week as this expansive low pressure system slowly inches east. A cold front should be passing through the region early Tuesday morning, with a wind shift accompanying it from the south to the west. Temperatures will fall off slightly, with highs in the upper 50s to low 60s on Tuesday and Wednesday. Overnight lows should only drop off into the upper 40s to mid 50s, a far cry from how low those temps should be this time of year. (Our average low temperature in mid-January is near the freezing mark!)

The same system that brought very icy conditions to the Central Plains this weekend will slowly push east, bringing a continued chance of showers and thunderstorms through this week for the Memphis area. The map above is valid at 6pm Tuesday. (NWS/WPC)

Another round of rain/storms

Temperatures will rebound on Thursday, with highs in the mid-60s in the metro, but with an increased chance of showers and thunderstorms as the slow-moving stationary front to our south continues to push out and low pressure develops to our southwest and moves across the area. A couple of those storms could be severe Thursday afternoon and into the evening. However, that rain will give way to a good start to your weekend, with temps nearing 70 degrees and partly sunny skies on Friday into Saturday. Lows remain comfortable for January, in the mid-50s, just cool enough to need a light jacket when taking the kids to school in the morning.

Early next week

As one system exits our picture late this week, another is taking shape over the west coast. That system could once again bring showers and thunderstorms late in the weekend into early next week to the Memphis area, with the best chance coming on Sunday. A chance of showers continues to hold in the forecast through at least Monday, with temperatures taking a dive into the 50s for highs and 40s for lows to start your next work week.

Where is winter, you might ask? Most of the eastern U.S. has been under well above average temperatures for the past week or so. However, long range models suggest that warm pool will be cooling off and winter-like temperatures could make a comeback as soon as the end of this month.

NOAA's 8-14 day temperature outlook covering January 24-30 suggests that warmer temperatures across the eastern half of the country will weaken, letting old man winter back in. (NWS/CPC)
Be sure to stay on top of the human-powered MWN Forecast this week and into the next by downloading the MWN mobile app or bookmarking our website. We’ll provide continuous updates on our social media platforms as well. Links to all of these tools can be found below this post.

Alex Herbst, Meteorologist
MWN Social Media Intern

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MWN is a NOAA Weather Ready Nation Ambassador Meteorologist Erik Proseus is an NWA Digital Seal Holder

Thursday, January 12, 2017

20s to 70s - it's winter in Memphis!

For those of you who were tired of the 88 hours of sub-freezing temperatures we had late last week and into the weekend, you got your wish. We're back in the 70s! Welcome to the bipolar weather of Memphis, where lingering snow one day is completely melted by 60s and 70s the next day!

Arrival of a cold front

A general warm pattern looks to continue well into next week, but we do get a reprieve of closer-to-average conditions tomorrow, as a cold front moves across the metro this evening, lingers just to our south into Saturday, then makes a return trip back to our north as a warm front this weekend. If you're out and about this evening, you'll likely notice the front between 8-10pm as warm and humid conditions give way to showers and then a shift in the wind to the north, accompanied by a roughly 20-degree temperature drop. Here's forecast radar for this evening and overnight showing the rain:

Forecast radar for the evening and overnight hours from the HRRR model. If the GIF doesn't animate, click here. (WxBell)

Friday into the weekend

With the front stalling just to our south, the much cooler surface air combined with a strong temperature inversion (warming air with increased height, rather than typical cooling) and abundant low-level moisture that produces a low cloud deck, will result in much cooler temperatures tomorrow. Look for morning bus-stop temperatures in the mid 40s and highs not much warmer, in the lower 50s. A cool northeast breeze will provide a stark contrast to today's tropical breezes and mid 70s highs!

A vertical cross-section of the atmosphere at 6am Friday, according to the NAM model, clearly shows the inversion and low-level moisture that develops behind tonight's cold front. The inversion will serve to trap low clouds in place until sometime Saturday, resulting in much cooler and overcast conditions.
The inversion and cloud cover remain in place Friday night and into Saturday, keeping temperatures nearly steady Friday night near 50° and introducing the possibility of areas of dense fog. By Saturday afternoon, some sun may break out as the front starts to return back to the north. allowing the mercury to climb back to 60° or higher. Sunday promises to be a day not unlike the last couple with highs once again pushing the 70° mark and some afternoon sun expected between the clouds. With the exception of a stray shower, or drizzle Saturday morning, most of the weekend looks to be dry.

Next week

Looking at next week, a large scale system to our west, that is held at bay through the weekend by the Bermuda High pressure system over the southeast U.S., will start slowly moving east. A few showers are possible Monday, mainly afternoon and evening, as highs reach near 70° again. By Tuesday and probably into early Wednesday, periods of heavy rain and some thunderstorms are possible as the system, and it's upper level low, cross the region. Temperatures will remain mild, so there are no winter weather concerns, but not as warm as Sunday and Monday. We'll be watching rainfall amounts closely as some flooding is possible if heavy rain is prolonged.

The NWS predicts a solid 2" of rain for the metro over the next week with heavier amounts to our west where some impactful icing is also possible this weekend. (WPC/NOAA)
For those looking for more "winter-like" conditions, there are some long-range signs of a pattern shift late in the month. Cross your fingers! You can always check for details out a week in advance in the MWN mobile app or on our website. Look for the human-powered MWN Forecast!


Erik Proseus
MWN Meteorologist

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Follow MWN on Facebook, Twitter, and Google+.
Visit MemphisWeather.net on the web or m.memphisweather.net on your mobile phone.
Download our iPhone or Android apps, featuring StormWatch+ severe weather alerts!
MWN is a NOAA Weather Ready Nation Ambassador Meteorologist Erik Proseus is an NWA Digital Seal Holder