Tropical Storm Emily continues to threaten Haiti; More extreme heat in Central U.S.
Tropical Storm Emily remains unorganized this morning, and continues to linger just south of Haiti, near 17.3°N, 72.3°W. Emily is 90 miles south of Port au Prince, Haiti. Storm motion over the past 24 hours has been slow, varying between completely stopped and west to west-northwest at 5 mph. This motion (or lack thereof) is still something that the models aren't analyzing well. Satellite imagery shows that thunderstorm activity on the north side of Emily seems to be disrupted, possibly by the terrain of Hispaniola, but also potentially by the continued moderate shear to the north of the storm. Wind shear has weakened to the northwest of the storm in the past 24 hours, but it will probably not be enough to allow Emily to undergo any significant intensification. The layer of dry air that we've been talking about for the past few days has also all but dissipated to the west and north of the storm. As the National Hurricane Center has been forecasting, environmental conditions are becoming slightly more favorable for the storm. Satellite estimates of wind motion suggest that low level circulation in the storm has become very broad and extends north over Hispaniola, which indicates that there's potential for the storm to undergo a quick jump to the north, but overall the storm remains weak and this seems unlikely. Emily continues to be tilted to the east with height, but doesn't appear as sheared as yesterday morning.
Conditions in Hispaniola have surely deteriorated over the past 24 hours, however, thunderstorm activity appears to have weakened over the island this morning. Infrared satellite imagery shows that cloud tops have warmed in the past 6 hours on the north side of the storm, which means that strong thunderstorms are no longer building high into the atmosphere. High resolution model forecasts (see Figure 1) have continued to predict that the heaviest rain will fall to the east of the storm. The longer Emily tracks west without taking a significant turn to the northwest, the more likely it is that Haiti will see the most extreme rainfall in the storm. Overall, 6 to 12 inches of rain is expected to fall, with local amounts up to 20 inches possible in higher terrain. Flash floods and mudslides are a serious threat.
Figure 1. Forecast radar and sea level pressure from the 06Z (2am EDT) run of the HWRF high resolution model. While I think that the model was initialized poorly and doesn't accurately represent where the storm will travel over the next 24 hours, I do think that the precipitation field is accurate. The strongest rain and winds have been on the east and north sides of the storm over the past couple of days. If Emily continues to move west before taking a significant turn to the northwest, Haiti could receive the strongest impact from the storm.
Forecast for Tropical Storm Emily
Models continue to waver back and forth on Emily's forecast track. Yesterday evening, the HWRF model forecast Emily to cross over Hispaniola and undergoing a close encounter with the Florida coastline. Last night, the National Hurricane Center wrote that "if Emily does not begin its northwestward turn soon…a watch could be required for parts of southern Florida today." Since the storm appears to be moving slightly more to the north than west this morning, this doesn't look like it will be necessary, although the forecast remains very uncertain. In today's 06Z runs, both the HWRF and the GFDL are probably forecasting Emily to move too far north in the next 12 hours. Given the present direction and speed of the storm, it's hard to see these two models' forecasts coming to fruition. The official forecast track from the National Hurricane Center is a turn to the northwest over the next 6 to 12 hours, with landfall in Haiti happening this afternoon. Beyond that, they forecast Emily to stay on a northwest course through the Bahamas, where Emily could restrengthen a bit before making a turn to the northeast on Sunday, although they qualify this forecast with the fact that it's very uncertain, and that the global models dissipate Emily after crossing Hispaniola. The official forecast track does not have Emily making any landfall in Florida, but the Miami to West Palm Beach area is still within the cone of uncertainty.
Interestingly, the models that have done the best job at predicting the track of Emily thus far are the less relied-on statistical track models—those that don't take into account any current atmospheric dynamics. If Emily remains on a west to west-northwest track today, we cannot rule out that it cross over a larger area of Cuba, approaching the southeast portion of Florida. However, given the amount of land interaction in this potential track, the probability of Emily remaining a tropical cyclone in this scenario is low.
Figure 2. Satellite imagery of Tropical Storm Emily at 10:15am EDT. The strongest thunderstorm activity is now in the southern portion of the storm. Thunderstorms over Hispaniola appeared to weaken this morning.
Typhoon Muifa
Typhoon Muifa continues to be a category 2 typhoon on the Saffir-Simpson scale. Satellite imagery shows a well developed storm that is moving west-northwest. Over the next day, Muifa is expect to turn to the northwest as it approaches China. Today's track forecast is more north and east of yesterday's, with a brief landfall just north of Shanghai, potentially as a category 3.
Figure 3. MODIS satellite imagery of Typhoon Muifa from earlier today, plotted using NASA's new Rapid Response Web Mapping Service.
Central U.S. heatwave
The heat continues for the central U.S., where I've heard reports that local media in the region were canceling all of their outdoor shots because of the dangerous conditions. Here are some of yesterday's extreme temperatures, which were compiled by our weather historian, Christopher C. Burt:
Little Rock, Arkansas set an all-time record with 114°F (the old record was 112°F set in 1986). Fort Smith, Arkansas set an all time record of 115°F (the old record was 113°F set both Tuesday and previously in 1936).
State maximum air temperatures from Wednesday:
• Arkansas: 116° at Silver Hill (4° short of state all-time record)
• Oklahoma: 115° at Atoka
• Louisiana: 111° at Caney
• Texas: 111° at Fort Worth and Wichita Falls (that also had a record high minimum of 88° this morning)
• Missouri: 109° at Branson and Ava
The heat index is also at play in this heat wave; some incredible values recorded yesterday include 126° in Poplar Bluff, Missouri, 125° in Walnut Ridge, Arkansas, and 122° in Arkadelphia, Arkansas. The GFS continues to forecast heat index values around 120° in the lower Mississippi Valley through the weekend.
Angela
Reader Comments
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If she has managed to get her circulation this far so quickly, then she might just be able to cling together until she gets away from Hispaniola. Still no confirmation that it is indeed closed, mind you.
Well, if I said "RIP Emily" and "EMILY CAT 5!!!" every day for a week, I'd eventually be right on one count, too.
If you can overlook my Porky Pig moment early on in the broadcast (Be-de-be-de-be-de-that's all folks!) you'll learn about the CERT teams and what they can do.
Valuable folks to have on your side after a disaster.
Say, that's a clever comment, alright. Thanks for adding so much value to the dialog!
Dont respond to him. remember minus and flag... he is a troll.
Could be valid, I think Recon should be looking in that area.
Yeah, but it can't cling together without any convection and it doesn't look vigorous enough on satellite to cause any sort of upward motion.
If the MLC remains strongly intact through Hispaniola, I wouldn't be surprised if she regenerates over the Bahamas.
MARK
17.88N/71.89W
WEAKENING FLAG FLAG
I'm not ready to RIP poor little Emily yet. Granted it was a more powerful, well organized storm to begin with, and the conditions were probably better, but there was another tropical storm that seemed to poof one night in about the same place near Haiti, and then this happened:
ZCZC MIATCDAT2 ALL
TTAA00 KNHC DDHHMM
TROPICAL STORM GUSTAV DISCUSSION NUMBER 13
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL AL072008
500 AM EDT THU AUG 28 2008
AN AIR FORCE RECONNAISSANCE PLANE HAS FOUND A SURPRISE THIS MORNING.
GUSTAV HAS EITHER REFORMED TO THE SOUTH OR BEEN MOVING MORE TO THE
SOUTH-SOUTHWEST OVERNIGHT. IN ADDITION...THE PRESSURE IS DOWN 10 MB
DURING THE LAST SIX HOURS. THE PLANE HAS NOT YET SAMPLED THE ENTIRE
STORM...BUT IT IS ASSUMED THE WINDS HAVE COME UP SLIGHTLY WITH THE
SIGNIFICANT PRESSURE FALL AND THE INITIAL INTENSITY IS INCREASED TO
45 KT.
I grok what you're saying.
Please don't quote Jason, he's a troll and I have him on ignore.
Even a stopped clock is right twice a day
Which numbers? Where are they?
Post 316
Quite the change of tune since yesterday evening, lol.
He's also on a lot of our ignore lists...in point of fact, he now holds the Floodman record for most incarnations of one person on the the ignore list. He supplanted "oh he of the my pretty pony shower curtain" about 2 months ago
ATCF is already calling it a 30-knot wave.
No, I'm just telling you that the wind shift, that econ just found, was westnorthwest of the previous fix. Whether or not it's an LLC, I don't know, but that position of the wind shift is fact.
This is rich..Lol.
Neapoitan BIG THANKS! This is huge news. Thanks for sharing!!! Really appreciate it!
VLEAAA
(Very. Large. Eye. Argh! Autonomous! Aachen!)
Holy cow! Sweet Polly Purebred!
Lol...Considering how we are shutting down the space program, it doesn't really matter. I guess we could fly to Mars with Russia.
I think you are correct acually if you look at the rgb loop and zoom in the area you can see some small very low level clouds coming togeather and some what of an arc is forming oriented N-SE this is slowly moving WNW so Guys I'M GETTING A HEARTBEAT!!
Off the weather, can't resist quoting your post.
Now also oxygen molecules (not just oxygen atoms/particles) have been found in the galaxy where Sirius is. Aliens, if they are out there, can breathe...
It's not right. Anyways...Sun is having problems.
and in the last 3 days he has circumvented Admin bans.
You may have a heartbeat, but Emily is still a mess. Going to take some serious recovery for her to even hit moderate TS status again.
Mississippi ... read up on SpaceX ... OSC ... ULA etc. There are definitely other players.
PLEASE quit quoting tropicfreak quoting Mark quoting Jason
TIA!!
I thought the circulation was southwest of the previous fix? Or did you change your mind?
Regeneration is always possible in the Bahamas.
If we start getting tropical cyclones in Aachen, then AGW really has gone too far...
Yep, I have been saying Gustav with this one, although I now believe she is on track with NHC.
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