Dr. Jeff Masters' WunderBlog

Spring flooding hits Midwest; Southeast drought eases
Posted by: Dr. Jeff Masters, 07:04 PM GMT del 20 Marzo 2008 +2
This year's annual spring flooding season is upon us, and it's been a worse flood year than usual across much of the Midwestern U.S. At least 13 people have been killed due to the flooding this week, with another three persons missing. A slow moving storm system brought rains in excess of ten inches to the region (Figure 1). These rains, combined with melting from unusually heavy snows this winter, have led to the floods.


Figure 1. Heavy rains exceeding 10 inches have fallen in some portions of the Midwest over the past week. Image credit: NOAA.

According to NOAA, 224 cities are experiencing flooding today, with major flooding reported in 13 cities in Missouri, Arkansas, Oklahoma, Texas, Indiana, Ohio, Kentucky, and Illinois. As snow continues to melt and runoff from the recent rains continues to increase the flooding, an additional 13 cities are expected to observe major flooding in the next 48 hours. Fortunately, no heavy rain is expected in the next three days, so a long duration flooding event is not likely.


Figure 2. The NOAA flood outlook calls for significant river flooding across much of the Midwest through Monday. Image credit: NOAA.

Flooding outlook for this Spring
According to NOAA, Above-normal flood potential is expected this Spring in much of the Mississippi River basin, the Ohio River basin, the lower Missouri River basin, Pennsylvania, New Jersey, most of New York, all of New England, and portions of the West, including Colorado and Idaho. Snow depths up to a foot above usual in upstate New York and much of New England could cause flooding in the Connecticut River Valley; locations in the mountains of Colorado and Idaho have 150 to 200 percent of average water contained in the snow pack, leading to a higher than normal flood potential there; and Wisconsin and northern Illinois have had heavy snows this winter that could cause continued flooding concerns this Spring.

Southeast drought continues to improve
On the plus side, the area of the Southeast U.S. covered by the severest form of drought--exceptional drought--has shrunk to a small spot over southern Tennessee/northern Alabama, and Georgia is free of exceptional drought for the first time since July. The drought is expected to continue to improve between now and June over the Southeast U.S.

Jeff Masters
Batesville's west side is flooded. (pb4ugo)
Hundreds of residents ere evacuated earlier today. As the water continues to rise, hundreds more may have to leave their homes.
Batesville's west side is flooded.
Flooding Strikes NE Arkansas & SE Missouri (ArkaTechHog77)
Severe flooding hits the area. My stepfather took a friend up and snapped these shots. Photos taken around HWY 53 area around Qulin and Poplar Bluff. Others taken in Clay County, Arkansas.
Flooding Strikes NE Arkansas & SE Missouri
Kroger 3 (Hawg8)
Local flooding
Kroger 3
Categories: Flood
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202. cchsweatherman 04:39 PM GMT del 22 Marzo 2008    
200. JFV 12:35 PM EDT on March 22, 2008
Hey Weatherman, would your website enter some kind or type of emergency mode; if there ever were a major hurricane headed directly towards South Florida?


Of course, JFV. I'll be working my site, making constant emails, and on the phone quite often. Always looking out for everyone.

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203. GBlet 04:40 PM GMT del 22 Marzo 2008    
I miss Bonedog.....
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205. Ivansrvivr 04:45 PM GMT del 22 Marzo 2008    
The warm MDO waters have been absent the last few years. (I believe due to the "hyperactive 04 and 05 seasons) This may be the year they return. I know most forecasters and models arent expecting El Nino conditions anytime soon but look at the Pacific. Warm anomalies are eating away at the current La Nina from both ends and from below. While I do think El Nino conditions are possible by the end of the season, I don't think they will occur anywhere near soon enough to have a significant impact on this years' Atlantic Hurricane season. I think it will be effectively Nina to Neutral this season.
If you look at all the next season forecasts they are all shots in the dark. Nobody predicted last season right before it started. Were all just guessing. It's not much different than filling out your Brackets for college basketball. As the season nears there will be more guesses and predictions. Lets just hope that there's no loss of life or property this season.
207. cchsweatherman 04:48 PM GMT del 22 Marzo 2008    
Yes JFV. Why?
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209. Ivansrvivr 04:57 PM GMT del 22 Marzo 2008    
JFV, by the time the season starts there will 30-40times the current traffic on this blog daily. There will be so much traffic here you will have more resources than you could ever imagine.
212. FLWeatherFreak91 05:13 PM GMT del 22 Marzo 2008    
Looks like a warm front has formed out ahead of the low. This will bring rain up past Tampa Link
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213. hurricane23 05:17 PM GMT del 22 Marzo 2008    
Hey folks for florida radars use my page you cant go wrong ive added many sites that will be of great use during days like today.SEE HERE
Member Since: Maggio 14, 2006 Posts: 8 Comments: 13327
214. FLWeatherFreak91 05:21 PM GMT del 22 Marzo 2008    
Hurricane... great site, but the link for the tampa/ruskin radar is wrong. It links to the tallahassee radar instead.
Member Since: Dicembre 1, 2006 Posts: 2 Comments: 3516
215. BahaHurican 05:22 PM GMT del 22 Marzo 2008    
Re: 201

About the SSTs, I was saying that warmer waters generally mean storms which form have more fuel to become - and remain - major hurricanes, which makes landfall at those higher strengths possible. So far, temps haven't been anomalously warm across the bulk of the tropical ATL, so we may not have to worry about deep pools of warm water building up.

Unfortunately, as the past has proven numerous times, it only takes one strike to ruin a summer . . .
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216. KEEPEROFTHEGATE (Mod) 05:25 PM GMT del 22 Marzo 2008    
dbz approaching 60 63 in se fla mainland w sw of miami
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217. cchsweatherman 05:27 PM GMT del 22 Marzo 2008    
Watching radar loops, it appears that storms have begun to explode across South Florida and have now begun to fill in over the area. Prepare for some very heavy rainfall over several hours. This will be one nasty afternoon where you'll need to make indoor plans for all areas Tampa southward. FLWeatherFreak, that is not the warm front coming up into Tampa. The warm front can clearly be seen over the Florida Keys, moving norhtward into Southern Florida. You guys are just getting a moisture surge in correlation with the approaching warm front.
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218. hurricane23 05:27 PM GMT del 22 Marzo 2008    
214. FLWeatherFreak91 1:21 PM EDT on March 22, 2008
Hurricane... great site, but the link for the tampa/ruskin radar is wrong. It links to the tallahassee radar instead.

Link fixed sorry about that scroll down you can always use the tampa radar from dupage.
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220. Ivansrvivr 05:35 PM GMT del 22 Marzo 2008    
Youre right about it taking one and that's why I find steering and tracks much more important than total number of named systems.
221. cchsweatherman 05:39 PM GMT del 22 Marzo 2008    
I will be back later. I'll be watching the radar.
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222. BahaHurican 05:56 PM GMT del 22 Marzo 2008    
220. Ivansrvivr 1:35 PM EDT on March 22, 2008
Youre right about it taking one and that's why I find steering and tracks much more important than total number of named systems.


I think total number does matter, in that the more storms there are "out there", the greater chance there is that one will hit you. So I prioritize (steering =1, count = 2) rather than not paying attention to count. For example, 1992 was terrible for Florida, but 2004 was worse.

I'm just hoping we don't get a "worst case scenario", with repeat intense storms over the same general area the way we did in '04. That wasn't much fun.
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223. BahaHurican 05:57 PM GMT del 22 Marzo 2008    
I've gotta go also. Back this evening.

Hope it doesn't rain here . . .
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224. hydrus 05:58 PM GMT del 22 Marzo 2008    
BAHA-HURRICANE-Amen to that.I am refering to that comment you made about 2004 Hurricane season.
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225. KEEPEROFTHEGATE (Mod) 06:05 PM GMT del 22 Marzo 2008    
entire west fla coast tampa s to keys fully engulfed with newest dev max dbz 59 collier south nice rains
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226. Ivansrvivr 06:11 PM GMT del 22 Marzo 2008    
I recall several years (the last two being perfect examples) that were above normal in numbers but the steering prevented US landfalls, i suppose if you wanted to get technical about it there was something of a Florida landfall in 06 but steering pushed the majors away. Steering was what made 04 a nightmare for Florida and the late 90's so bad for the Carolinas. Steering also kept Florida from being hit through the 80s until 99.
227. Ivansrvivr 06:17 PM GMT del 22 Marzo 2008    
I forgot the 2 that hit Pensacola in 95. But that too was steering.
228. KEEPEROFTHEGATE (Mod) 06:18 PM GMT del 22 Marzo 2008    
now we wait and see what it spins up to be
as it gets to the east
and the western sea
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229. cchsweatherman 06:29 PM GMT del 22 Marzo 2008    
I'm back now.
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230. cchsweatherman 06:37 PM GMT del 22 Marzo 2008    
There is now new convection developing farther out into the GOM on the western quadrant of the surface low. Widespread rain and storms have now overspread all Miami-Dade county with some quite impressive rainfall totals starting to accumulate. Only a matter of time before all this rain moves into my area and really gives us a much-needed soaking. Here are the latest satellite images.



Taking a look at the satellite imagery, could we daresay that there looks to be some tropical development taking place? The QuikSCAT I posted earlier had indicated a closed surface circulation with some 30kt+ winds. You can also see convection has begun building on the western portion. Something just seems unusual regarding this system. Looks more tropical to me than extratropical.
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231. KEEPEROFTHEGATE (Mod) 06:42 PM GMT del 22 Marzo 2008    
lets just watch cchs
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232. FLWeatherFreak91 06:45 PM GMT del 22 Marzo 2008    
The ares of low-level circ. is under 30 knt shear compared to 50 which lies to its east...I believe the low shows tropical characteristics although it's not going anywhere big...
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233. TerraNova 06:46 PM GMT del 22 Marzo 2008    
Does this system have a warm core or cold core?
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234. Ivansrvivr 06:51 PM GMT del 22 Marzo 2008    
Is it all that surprising that the low would have some tropical characteristics? SSTs are marginal. There is warm tropical air being drawn in to the system. It is likely tropical at the surface, but not up top. Upper level winds are too strong for it to fully develop as a tropical system. We need a good tropical downpour over the entire peninsula.
236. Ivansrvivr 06:53 PM GMT del 22 Marzo 2008    
Lets just call it Sub-tropical.
237. Cavin Rawlins 06:54 PM GMT del 22 Marzo 2008    
AMSU says neither warm core nor cold core.
Member Since: Luglio 24, 2005 Posts: 407 Comments: 19076
238. TerraNova 06:55 PM GMT del 22 Marzo 2008    
It looks cold core to me...in any case if this was late May or June then this would have a better, significant shot at tropical genesis (as ocean temperatures would be warmer and shear would be reduced).

Cyclone Phase Diagrams from the UKMET model show a deep, asymmetric cold core.
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239. Cavin Rawlins 06:58 PM GMT del 22 Marzo 2008    
that low in the cyclone phase diagram is future cyclone. Is that same as the one as in the Gulf?
Member Since: Luglio 24, 2005 Posts: 407 Comments: 19076
240. Ivansrvivr 07:00 PM GMT del 22 Marzo 2008    
The upper level overcast is overhead now. It doesn't have that "tropical" look to it. Looks more like a winter type system. Any tropical characteristics would likely be confined to the surface. If it were June or July, with calm upper level winds, It wouldn't take long for it to go tropical.
241. TerraNova 07:01 PM GMT del 22 Marzo 2008    
W456 - the UKMET initiates that storm 18 hours from now. It was the closest I could find since none of the other models have phase diagrams on the current system (NOGAPS and CMC initiate the low once it has emerged off of the east coast of Florida).
Member Since: Luglio 30, 2007 Posts: 76 Comments: 4058
242. Ivansrvivr 07:02 PM GMT del 22 Marzo 2008    
the convection on the western side of the low could be the formation of a cold front.
243. Ivansrvivr 07:03 PM GMT del 22 Marzo 2008    
The NOGAPS and CMC are a bit late on this one.
245. HurricaneGeek 07:06 PM GMT del 22 Marzo 2008    
Hey guys. It had gotten very dark here is West Palm Beach, but no rain, at least at my neighborhood, to speak of.
Member Since: Maggio 10, 2007 Posts: 110 Comments: 7039
246. TerraNova 07:06 PM GMT del 22 Marzo 2008    
JFV, there's a flood advisory out for your county.

Link
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248. KEEPEROFTHEGATE (Mod) 07:13 PM GMT del 22 Marzo 2008    
if and i say if it would dev warning would have litle time if any at all at this point hunker down wait it out things can change in a blink of an eye
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249. cchsweatherman 07:14 PM GMT del 22 Marzo 2008    
Seems like the NWS has changed their tune quite a bit in terms of possible severe weather and how strong the cold front will be once it passes through South Florida.
NWS Miami Forecast Discussion
Member Since: Aprile 14, 2007 Posts: 8 Comments: 4928
250. cchsweatherman 07:18 PM GMT del 22 Marzo 2008    
Southeast Florida should prepare for some significant flooding as it appears the warm front has been moving much slower than anticipated. In addition, it appears the warm front and the GOM low will merge together later this evening and really enhance the rainfall and storms over the area. Surprisingly, still no rain here in Cooper City, although the skies have become terribly dark. Just heard the first rumble of thunder today while typing this. Radar imagery for South Florida is below.
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251. TerraNova 07:27 PM GMT del 22 Marzo 2008    
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About JeffMasters
Jeff co-founded the Weather Underground in 1995 while working on his Ph.D. He flew with the NOAA Hurricane Hunters from 1986-1990.

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