Unanswered questions concerning Hurricane Isaac

By: Dr. Jeff Masters , 4:35 PM GMT on August 31, 2012

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The top winds of Tropical Depression Isaac have fallen to 25 mph, but the storm continues to be a potent rain-maker as it heads north-northwest at 11 mph into Missouri. Isaac has spawned up to 20 suspected tornadoes, brought storm surges as high as 13.6' to the coast (in Lake Borgne, LA), and dumped 20" of rain at one station in New Orleans. The 13.27" of rain that fell at Hattiesburg, MS broke the record for wettest August in the city's history (previous record: 13.03" in 1987.) Major flooding is occurring on seven rivers in Louisiana and Mississippi. Isaac is being blamed for at least four deaths in the U.S., 24 in Haiti, and five in the Dominican Republic.

A few notable rainfall totals from Isaac, through 11 am EDT on Friday:

20.08" New Orleans, LA
15.02" Marion, MS
13.99" Pascagoula, MS
13.27" Hattiesburg, MS
10.85" Gulfport, MS
10.39" Slidell, LA
10.17" Biloxi, MS
9.85" Mobile, AL
7.38" Pine Bluff, AR
5.95" Baton Rouge, LA

A major reason for Isaac's heavy rainfall totals has been its very slow motion. This slow speed was due to the fact Isaac has been bumping into a ridge of high pressure that is unusually strong, due to the intense drought over the center of the U.S.; strong drought-amplified high pressure areas are very resistant to allowing any low pressure areas to intrude into their domain. The high pressure area was strong enough this week to allow several all-time records for heat this late in the year to be set:

112° on August 29 at Winner, SD
108° on August 29 at Valentine, NE
107° on August 29 at Corpus Christi, TX
97° on August 29 at Denver, CO (2nd highest so late in the year)


Figure 1. Nighttime view of Hurricane Isaac taken at 1:57 am CDT August 29, 2012, by the Visible Infrared Imaging Radiometer Suite (VIIRS) on the Suomi-NPP satellite. The VIIRS day-night band detects light in a range of wavelengths from green to near-infrared, and uses light intensification to enable the detection of dim signals. In this case, the clouds of Isaac were lit by moonlight. Image credit: NASA.

Isaac's beneficial rains falling in drought-stricken regions
Hurricanes get a lot of attention because of the billions in damage they cost, and the lives they disrupt. AIR Worldwide estimated today that insured damage from Isaac would cost up to $2 billion. This does not include damage to infrastructure or uninsured damage, so the final price tag of Isaac's rampage will be more like $3 - $5 billion. However, Isaac is now dumping beneficial rains over Arkansas, Missouri, Illinois, Indiana, Ohio, and Kentucky--regions stricken by the worst drought since the 1950s or 1930s, depending upon the exact location. These regions need 9 - 18 inches of rain to pull them out of drought. Isaac's 3 - 6 inches of rain will not end the drought, but will put a pretty good dent in it. I expect that 3 - 6 inches of rain for a wide swath of prime agricultural land in extreme drought is probably worth at least $5 billion, when you consider that a recent estimate by a Purdue economist put the cost of the great drought of 2012 at more than $77 billion. Only Hurricane Katrina ($146 billion) and the drought of 1988 ($78 billion) have been more expensive disasters, according to NOAA's National Climatic Data Center. Unfortunately, Isaac's arrival is poorly timed, as the storm is arriving during harvest season. The strong winds associated with the storm will flatten many crops, making it more difficult to harvest them, and Isaac's winds may cost farmers several hundred million dollars due to unharvestable crops. Still, the rains from Isaac will be highly beneficial for the success of the upcoming winter wheat season, and for next year's growing season.


Figure 2. Predicted precipitation for the five-day period ending on Tuesday evening shows that Isaac is expected to bring a large region of 3 - 6 inches of rain (red, orange, and brown colors) to Arkansas, Missouri, Illinois, Indiana, Ohio, and Kentucky. Image credit: NOAA/HPC.


Figure 3. The great drought of 2012 has brought so little rain to the Midwest that some areas require over 15" of rain (dark purple colors) to end the drought. Image credit: NOAA/CPC.

Unanswered questions about Hurricane Isaac

1. Did the passage of Hurricane Isaac stir up oil from the Deepwater Horizon oil spill? Isaac was the first hurricane to pass over the site of the 2010 Deepwater Horizon oil spill. We know that large hurricanes are capable of creating currents in deep water at the bottom of the Gulf of Mexico; Hurricane Ivan caused upwelling currents of 0.5 cm/s at a depth of about 500 meters. In an August 28 article in the Huffington Post, Nick Shay, professor of meteorology and physical oceanography at the University of Miami, said: "Winds will push water away from the center of a storm, which causes an upwelling as the ocean tries to adjust. It brings whatever is near the bottom up higher in the water column and currents can then push it towards the coast." Up to 1 million barrels of oil from the spill are estimated to still be present in the deep water sediment, on beaches, and in the marshes of Louisiana, and it is possible some of this oil will wash up on the Gulf Coast in coming months. The storm surge of Isaac also likely flushed out oil lodged in the coastal marshes of Louisiana, but it is unknown how much of a concern this might be.

2. What's the deal with these super-sized Category 1 and 2 hurricanes that have been hitting the U.S.? The past three landfalling hurricanes in the U.S.--Isaac (2012), Irene (2011), and Ike (2008)--have all been exceptionally large, among the top ten on record for horizontal extent of tropical storm-force winds. Each of these storms had an unusually low pressure characteristic of a storm one full Saffir-Simpson category stronger. Is this the new normal for U.S. hurricanes?

3. Did the new $14.5 billion upgrade to the New Orleans levee system cause worse flooding elsewhere? Whenever a new levee or flood control structure is created, you make someone else's flood problem worse, since the water has to go somewhere. Where did the water was stopped by the new $1.1 billion, 1.8 mile-long Lake Borgne flood barrier on the east side of New Orleans go? Did it flow south and contribute to the overtopping of the levees near Braithwaite? Or did it go north and contribute to the 36 hours of storm surge in excess of 5' observed along the Mississippi coast at Waveland? I posed this question to NHC's storm surge expert Jaime Rhome, and he said it was impossible to know without doing detailed storm surge modeling studies.

4. Can only hurricanes beginning with the letter "I" hit the U.S. now? Isaac (2012), Irene (2011), and Ike (2008) are the last three hurricanes to hit the U.S. It turns out that hurricanes that begin with the letter "I" and "C" have more names on the list of retired hurricanes than any other letter (nine each.) I'm thinking Isaac will get its name retired, letting storms beginning with "I" take over sole possession of first place on the retired storms list.

Hurricane Kirk in the Central Atlantic
Hurricane Kirk intensified into a 105 mph Category 2 hurricane this morning, becoming the 2nd strongest hurricane of the 2012 Atlantic hurricane season. Hurricane Gordon was the only stronger storm; Gordon hit sustained winds of 110 mph just before reaching the Azores Islands on August 18. Kirk has probably peaked in intensity, and is about to move over colder waters and gradually decay. Kirk is not a threat to any land areas.


Figure 4. Morning satellite image of Tropical Storm Leslie.

Tropical Storm Leslie a long-range threat to Bermuda, Canada, and the U.S. East Coast
Tropical Storm Leslie formed on Thursday in the Central Atlantic. Leslie's formation date of August 30 puts 2012 in 2nd place for earliest formation date of the season's 12th tropical storm. Only 1995 had an earlier formation date of the season's 12th storm. With records dating back to 1851, this year is only the second time 8 total storms have formed in August. The other year was 2004, when the first storm of the season formed on August 1 (Alex), and the 8th storm (Hermine) formed on August 29th. Satellite loops show that Leslie has a modest amount of heavy thunderstorm activity, and respectable low-level spiral bands and upper-level outflow. Conditions appear ripe to allow Leslie to intensify into a Category 2 hurricane by Sunday. Fortunately, Hurricane Kirk is weakening the ridge of high pressure to the north of Leslie, and Leslie is expected to turn to the northwest and miss the Lesser Antilles Islands. However, steering currents for Leslie are expected to collapse early next week, as Leslie gets stuck between two upper level lows. The storm will then slowly meander over the open ocean for many days, potentially threatening Bermuda. Leslie will stay stuck until a strong trough of low pressure approaches the U.S. East Coast around September 8. This trough should be strong enough to pull Leslie to the north and then northeast by September 9. At that time, Leslie may be close enough to the coast that the storm will make landfall in New England, Canada, or the Mid-Atlantic states. Leslie could also miss land entirely; this all depends upon the timing and strength of the September 8 trough of low pressure. Regardless, Leslie is expected to bring an extended period of high waves to the U.S. coast. According to NOAA's Wavewatch III model, large swells from Leslie will reach Bermuda by Monday, and arrive along the U.S. East Coast on Tuesday. These waves will be capable of creating dangerous rip currents and beach erosion.

Portlight disaster relief charity responds to Isaac
The Portlight.org disaster relief charity, founded and staffed by members of the wunderground community, are in Mississippi, helping out with Isaac relief efforts. You can check out their progress or donate to Portlight's disaster relief fund at the portlight.org website.

I'm planning on taking Saturday off, but will have a new post for you on Sunday. Have a great holiday weekend, everyone!

Jeff Masters

Hurricane Isaac Louisiana (apphotos)
People play in the storm surge from Hurricane Isaac, on Lakeshore Drive along Lake Pontchartrain, as the storm nears land, in New Orleans, Tuesday, Aug. 28, 2012. (AP Photo/Gerald Herbert)
Hurricane Isaac Louisiana
Portlight volunteers at Biloxi shelter (Portlight)
Portlight volunteers at Biloxi shelter
Hurricane Isaac Louisiana (apphotos)
Research students from the the University of Alabama measure wind speeds as Hurricane Isaac makes landfall, Wednesday, Aug. 29, 2012, in New Orleans, La. Isaac was packing 80 mph winds, making it a Category 1 hurricane. It came ashore early Tuesday near the mouth of the Mississippi River, driving a wall of water nearly 11 feet high inland and soaking a neck of land that stretches into the Gulf. The storm stalled for several hours before resuming a slow trek inland, and forecasters said that was
Hurricane Isaac Louisiana
TS Isaac (Raine911)
Between the rain bands
TS Isaac

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Ouch..
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THE DEATH CAME IN THIS SHAPE



MY BIRTDAY!!
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Quoting LargoFl:
GFS has changed now..at this time last i checked it was sitting off NC..now it has it stalled off the coast, for at least 60 hours or more..im watching This storm closely, the runs will change once again in the next few days...


The Euro is seeing a trough split off the SE coast while the GFS isnt..could make the difference in track..
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Leslie looking impressive.
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Quoting aspectre:
1513 wxmod
883 aspectre...June 11, 2012: From eyeballing the chart, sea ice extent-minimum dropped from 2006's ~4,400,000sq.kilometres to 2007's ~3,000,000sq.kilometres

A similar ~1,400,000sq.kilometres drop from 2011's ~3,400,000sq.kilometres would produce a sea ice extent-minimum of ~2,000,000sq.kilometres for 2012... And

wouldn't be much of a consolation.
not sure what your point is of your cartoon there...
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GFS has changed now..at this time last i checked it was sitting off NC..now it has it stalled off the coast, for at least 60 hours or more..im watching This storm closely, the runs will change once again in the next few days...
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From Dr. Masters Blog:

2. What's the deal with these super-sized Category 1 and 2 hurricanes that have been hitting the U.S.? Each of these storms had an unusually low pressure characteristic of a storm one full Saffir-Simpson category stronger

I hate to see a Major come at the US with the characteristics of the saffir simpson like the Cat 1s have had..
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Quoting Jeff Masters:
2. What's the deal with these super-sized Category 1 and 2 hurricanes that have been hitting the U.S.? The past three landfalling hurricanes in the U.S.--Isaac (2012), Irene (2011), and Ike (2008)--have all been exceptionally large, among the top ten on record for horizontal extent of tropical storm-force winds. Each of these storms had an unusually low pressure characteristic of a storm one full Saffir-Simpson category stronger. Is this the new normal for U.S. hurricanes?
That's quite an unusual statistic. It may be coincidence, but even coincidences need to sometimes be explained.
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"IT NOW APPEARS THAT LESLIE
WILL MISS A TROUGH FORECAST TO DIVE OFFSHORE OF NORTH AMERICA...AND
WILL BE CAUGHT IN AN AREA OF LIGHT STEERING CURRENTS IN THE LONG
RANGE. THE MODELS CONTINUE TO SLOW DOWN AT DAYS 4 AND 5...AND THE
NHC FORECAST IS SHIFTED SLIGHTLY TO THE SOUTH AND WEST AT THOSE
TIMES."-NHC

Well there you have it folks, they have the slightest clue where it is going... again.

Just close your eyes, throw a dart and see where it lands and take a few peeks at the satelite pictures once in awhile and you have a very good reliable model!
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BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LITTLE ROCK AR
1051 AM CDT FRI AUG 31 2012

THE NATIONAL WEATHER SERVICE IN LITTLE ROCK HAS ISSUED A

* FLASH FLOOD WARNING FOR...
JEFFERSON COUNTY IN SOUTHEAST ARKANSAS...
NORTHERN CLEVELAND COUNTY IN SOUTHEAST ARKANSAS...
SOUTHEASTERN DALLAS COUNTY IN SOUTHWEST ARKANSAS...
SOUTHEASTERN GRANT COUNTY IN CENTRAL ARKANSAS...
SOUTHERN LONOKE COUNTY IN CENTRAL ARKANSAS...

* UNTIL 500 PM CDT FRIDAY

* AT 1045 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR
CONTINUED TO INDICATE A BAND OF SHOWERS AND ISOLATED THUNDERSTORMS
FROM LONOKE TO PINE BLUFF AND FORDYCE. VERY HEAVY RAIN WAS
OCCURRING WITH THIS BAND OF PRECIPITATION. RAIN WAS FALLING
OVER AREAS THAT RECEIVED FIVE TO MORE THAN EIGHT INCHES OF
RAIN SINCE THURSDAY. MANY ROADS WERE UNDER WATER IN THE
ENGLAND...FORDYCE AND PINE BLUFF AREAS. SANDBAGGING OF HOMES
WAS OCCURRING IN SOME CASES...WITH HOMES THREATENED BY HIGH
WATER. AT PINE BLUFF...HIGH WATER RESCUES WERE TAKING PLACE.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
RISON... PINE BLUFF... GRAYS LAKE...
WHITE HALL... WARBRITTON... TOLEDO...
PINE BLUFF ARSENAL... PARKERS CORNER... MT ELBA...
LAMONT... LAKE PINE BLUFF... KINGSLAND...
KEO... KEDRON... HUMNOKE...
HENSLEY ISLAND... ENGLAND... COTTONDALE...

THIS IS FLASH FLOOD EMERGENCY FOR ENGLAND...PINE BLUFF...
FORDYCE...AND SURROUNDING AREAS.
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Thanks, Doc. A lot of info covered today. Guess we just sit and watch another one.
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beach goers something to watch out for this Labor day weekend
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Thank you Dr. Masters
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1513 wxmod:

883 aspectre...June 12, 2012: From eyeballing the chart, sea ice extent-minimum dropped
from 2006's ~4,400,000sq.kilometres to 2007's ~3,000,000sq.kilometres

A similar ~1,400,000sq.kilometres drop from 2011's ~3,400,000sq.kilometres would produce a sea ice extent-minimum of ~2,000,000sq.kilometres for 2012... And

wouldn't be much of a consolation.
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288 hrs. the GFS bombs out Leslie:

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Quoting wxmod:
China plans to enhance weather modification
Link
BEIJING - China said Thursday it will take more active steps to enhance weather modification, in a bid to better serve agricultural production and disaster relief work.

The country aims to build a relatively complete weather modification system by 2020 and make significant improvements in providing basic guarantees and security management, according to a plan published on the Chinese government's website, www.gov.cn.

By 2020, China plans to increase precipitation by 60 billion tonnes annually via cloud seeding, as well as extend the coverage of artificial hail suppression to more than 540,000 square kilometers from the current 470,000 square kilometers, it said.

The government also requires local authorities to ensure weather modification services on agricultural production, exploitation of cloud-water resources, emergency response and the safeguarding of major events.

China has resorted to weather modification to prevent the usually unpredictable weather from disrupting major events, such as the 2008 Summer Olympics.
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BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAKE CHARLES LA
1047 AM CDT FRI AUG 31 2012

THE NATIONAL WEATHER SERVICE IN LAKE CHARLES HAS EXTENDED THE

* FLASH FLOOD WARNING FOR...
NORTHWESTERN AVOYELLES PARISH IN CENTRAL LOUISIANA...
RAPIDES PARISH IN CENTRAL LOUISIANA...

* UNTIL 200 PM CDT

* AT 1039 AM CDT...RADAR AND RAIN GAUGE ESTIMATES INDICATE THAT 4 TO
6 INCHES OF RAINFALL HAS OCCURRED OVER NIGHT AND THIS MORNING WITH
ISOLATED AMOUNTS OF JUST OVER 7 INCHES. THIS AREA WAS IN A NARROW
BAND ACROSS RAPIDES PARISH FROM NEAR GLENMORA NORTHEAST TO THE
SOUTH SIDE OF ALEXANDRIA TO HOLLOWAY. THERE ARE SEVERAL REPORTS OF
FLOODED ROADS IN THE WARNING AREA AND FLOODING WILL CONTINUE FOR
THE NEXT FEW HOURS AS RUNOFF FROM THE HEAVY RAIN CONTINUES. AT
THIS TIME THE HEAVY RAINFALL HAS ENDED...HOWEVER ADDITIONAL
SHOWERS AND THUNDERSTORMS COULD STILL DEVELOP THAT WOULD PRODUCE
ADDITIONAL HEAVY RAINFALL.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
ALEXANDRIA...GLENMORA...PINEVILLE...BALL...CENTERP OINT...DEVILLE...
ESLER REGIONAL AIRPORT...HOLLOWAY...KINGSVILLE...KOLIN...
LECOMPTE...LIBUSE...PARADISE...POLAND...RUBY AND TIOGA.

SOME OF THE CREEKS AND DRAINAGES THAT ARE LIKELY FLOODING INCLUDE
BUT ARE NOT LIMITED TO DYSON AND LITTLE HORSEPEN CREEKS AROUND
LISBUE...AS WELL AS BURGESS AND BARBER CREEKS AROUND WOODWORTH AND
FOREST HILL.
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Have a great day off doc!
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Thanks for the update Jeff!
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Dr. Masters co-founded wunderground in 1995. He flew with the NOAA Hurricane Hunters from 1986-1990. Co-blogging with him: Bob Henson, @bhensonweather

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