Latest on Tropical Storm Isaac

By: KBTX Weather Email
By: KBTX Weather Email

8pm Thursday Update

Isaac Continues to Weaken

As Isaac continues to move further inland the storm continues to weaken. The storm is still producing rainfall totals from 7-14 inches leading to in-land flooding. South Arkansas is dealing with immense rain this evening as the storm has started to turn in a more northerly direction. At this time the main threat is heavy rain and gusty winds. Seeing winds under 35mph for most of the evening. The storm is anticipated to be a post tropical remnant-low by Saturday morning.

This is the last update on Isaac. For up-to-date information on the storm you can go to the National Hurricane Center's web page.

4pm Thursday Update

Isaac Weakens to Tropical Depression

Location: 32.7N 92.6W

Maximum Sustained Winds: 35mph

Central Pressure: 995mb

Movement: North-Northwest at 12mph

Isaac continues to lose strength and has officially been downgraded to a tropical depression. The slow moving storm continues to drop a lot of rain leading to the potential of inland flooding. The storm is expected to continue to weaken and make a turn towards the North later this evening.

10am Thursday Update

Location: 31.7N 92.1W

Maximum Sustained Winds: 40mph (1mph more than Tropical Depression Status)

Central Pressure: 987mb

Movement: North-Northwest at 9mph (slowly gaining strength)

Tropical Storm Isaac currently is located 50 miles south of Monroe, LA and 165 miles northwest of New Orleans.

Tropical storm force winds can be felt up to 195 miles from the center of this storm -- mainly to the southeast of the center over open water and along the coasts of Mississippi and Louisiana.

Isaac is still anticipated to become a tropical depression by as early as this afternoon and by as late as this evening. Although the storm is losing strength, it will continue to spread inland though the Central United States producing heavy, possibly flooding, rain.

The Dam at Lake Tangipahoa (at Percy Quinn State Park in Louisiana) is failing thing morning. Mandatory evacuations for all areas along the Tangipahoa River and parts of Tanipahoa Parish have been ordered -- roughly 50,000 to 60,000 residents. Click here for more details on the evacuation.

Next update from the National Hurricane Center due in around 1pm and 4pm.

7am Thursday Update

Location: 31.1N 91.8W

Maximum Sustained Winds 45mph

Central Pressure: 985mb

Movement: Northwest at 8mph

Tropical Storm Isaac continues to move slowly northwestward over Central Louisiana -- the storm continues to produce heavy rain, severe weather and high water levels along the Northern Gulf Coast.

The center of Isaac is currently 35 miles southeast of Alexandria, Louisiana and 125 miles northwest of New Orleans, Louisiana. Tropical storm force winds extend outward 175 miles from the center of the storm.

While storm surge will continue to be an issue along the immediate coastline, the good news for some is that with Isaac moving on, winds have shifted directions and should start to push some of the flood waters back to the south towards the Gulf of Mexico where it belongs.

As of Thursday morning, a few light showers have started to creep into the far Eastern side of Texas. High-to-mid level cloudiness will stream in from the east to the west of the Brazos Valley, along with the slight shot at a few passing showers. Should that rain pop up in the area (best chance will be along I-45 and points to the east), expect it to move from the north to the south / southeast.

Tropical Storm Isaac is expected to continue to weaken as it continues to the north-northwest today and should be a tropical depression by this evening or overnight.

Next update from the National Hurricane Center is due in around 10am.

4am Thursday Update

Isaac remains a tropical storm sitting 55 miles southeast of Alexandria, LA and 110 miles northwest of New Orleans, LA. Isaac is anticipated to continue to weaken today, as it moves into Northern Louisiana, and become a tropical depression by this evening.

Current Location: 30.9N 91.6W

Maximum Sustained Winds: 45mph

Central Pressure: 983mb

Movement: Norhwest at 8mph

Wednesday Late Evening Update

Location: 30.3N 91.2W

Maximum Sustained Winds: 60mph

Central Pressure: 980mb

Movement: Northwest at 6mph


Wednesday Evening Update

Isaac Continues to Weaken

Location: 30.1N 91.1W

Maximum Sustained Winds: 60mph

Central Pressure: 977mb

Movement: Northwest at 5mph

Tropical Storm Isaac is on a downward spiral as the system continues to move inland. The slow moving storm continues to produce heavy downpours and a significant storm surge. Flooding is imminent due to the anticipated rainfall totals of 7-14 inches and a current storm surge near 7 feet. Some isolated areas could receive up to 25 inches of rain. The winds are sustained up to 60mph and some areas are seeing gust up to 67mph.The strongest winds are currently located on the water or near the coast. Isaac is expected to continue to weaken and become a Tropical Depression by Thursday evening and move into southern Arkansas by Friday.

Be sure to click on the link to see Social Media & Twitter's Response to #Isaac.

Wednesday Afternoon Update

Isaac Weakens to a Tropical Storm.

Location: 29.8N 90.9W

Maximum Sustained Winds: 70mph

Central Pressure: 974mb

Movement: Northwest at 6mph

Tropical Storm Isaac is moving at a snail like pace of 6mph in a Northwesterly direction. At this rate the storm is expected to drop an average of 7-14 inches of rain with isolated locations receiving up to 25 inches. So far the system has officially dropped 17 inches of rain in New Orleans and is expected to drop a lot more. On the bright side, the storm is losing some strength as it travels further inland. The winds are expected to gradually weaken enough for Isaac to be considered a tropical depression by Thursday evening.

The path of Isaac is still dependent on the ridge building back. For now, Isaac is expected to make a turn to the north-northwest by Thursday. It is likely that the center of the storm will move further inland over Louisiana through tomorrow and then eventually over southern Arkansas by Friday.

Damage reports and pictures of flooding continue to fill Twitter feeds this afternoon. Be sure to click on the link to see Social Media & Twitter's Response to #Isaac.

Wednesday Noon Update

Location: 29.7N 90.8W

Maximum Sustained Winds: 75mph

Central Pressure: 973mb (slowly rising)

Movement: Northwest at 6mph

Not much change with the noon advisory from the National Hurricane Center on Hurricane Isaac. The storm is currently sitting 10 miles NW of Houma, Louisiana and 45 miles to the West-Southwest of New Orleans. The central pressure has come up slightly and the eye is slowly starting to disappear as the storm continues it's slow movement inland.

Hurricane force can be felt 45 miles from the center of Isaac while Tropical Storm force winds are extending 175 miles out from the center of the storm. A gust of 71mph was reported at Pilot Station (near the Mouth of the Mississippi).

Damage reports and pictures of flooding continue to fill Twitter feeds this afternoon. Be sure to click on the link above to see Social Media & Twitter's Response to #Isaac.

Next intermediate advisory from the National Hurricane Center is due in around 2pm with a complete forecast (and new forecast path) due in near 4pm.

10am Wednesday Update

Location: 29.6N 90.7W

Maximum Sustained Winds: 75mph

Central Pressure: 972mb (rising)

Movement: Northwest at 6mph

Hurricane Isaac is slowly starting to weaken as the center of the storm is now inland sitting on top of Houma, Louisiana. The storm is also located just 45 miles to the southwest of Louisiana.

A northwest movement is expected from Isaac through tonight followed by a turn to the north-northwest by Thursday night or early Friday morning. This will take the storm slowly though Louisiana today and Thursday and then over southern Arkansas by Friday morning.

Hurricane force winds are extending 45 miles outward from the center of Isaac and tropical storm force winds extend outward 175 miles from the middle of this storm.

Storm surge of near 8 feet has recently been reported at Shell Beach, Louisiana and Waveland, Mississippi.

Hurricane conditions are expected to continue to affect parts of southeastern Louisiana and Mississippi into this afternoon. A wind gust of 74mph was reported near the top of the hour at the Mid Lake Station in Lake Ponchartrain and a gust of 63mph was reported at the New Orleans International Airport.

The eye of Hurricane Isaac (as of 10am, over Houma, LA) measured in with a diameter of 40 nautical miles.

Isaac is currently moving northwest through a weakness in the sub-tropical ridge to the northwest of the storm. This movement is likely to continue over the next 24 hours, followed by a turn to the north-northwest and then northward around the western side of the ridge over the next 36 to 48 hours.

Because Isaac is a slow moving storm, heavy flooding rain will continue to be a threat over the next 24 to 36 hours across most of the Northern Gulf Coast and the South Central United States.

National Ocean Service Tide Gages are indicating storm surge heights of 6 to 8 feet are still occurring along portions of the Southern Louisiana and Mississippi Coasts.

Next Advisory from the National Hurricane Center due in around 12pm and 2pm, followed by a complete forecast update around 4pm
9am Wednesday Update

President Nungesser of Plaquemines Parish (similar to a County Commissioner in Texas) says that 12 to 14 feet of water has collected on the east bank due to over topped levees early this morning -- rescues for residents is currently underway.

Tornado warnings are in effect for parts of Louisiana and Mississippi this morning as a Tornado Watch will remain in effect for Southeast Louisiana, Southern Mississippi and far Southeast Alabama through 4pm today.

Flooding has also been reported in Biloxi -- 2 feet of water has flooded Highway 90 pushing water up to the doors of the Hard Rock Casino.

Road flooding from heavy rain has been reported in New Orleans as well. As of last check, levees and all 25 pumping stations are working as they should (which was the leading cause of problems with Hurricane Katrina)


8am Wednesday Morning Update

Location: 29.5N 90.5W

Max. Sustained Winds: 80mph (although higher gusts near 100mph are still being reported)

Central Pressure: 970mb (center near Houma, LA)

Movement: NW at 6mph

Hurricane Isaac (Category 1) is about 15miles ESE of Houma, Louisiana and 40 miles SW of New Orleans. Isaac is anticipated to slowly move through Louisiana today and Thursday and then over Southern Arkansas by Friday.

Storm surge of 6 feet to 10 feet have been reported along the Coast of Louisiana and Plaquemines Parish has seen flooding waters due to the surge over topping levees forcing residents to higher ground and into attics to ride out the storm along with the flood waters. Officials are reporting that 65% to 70% of New Orleans is without power this morning and will likely remain that way for some time.

Isaac remain quasi-stationary for several hours overnight and then slowly made a second landfall near Port Fourchon, Louisiana around 2:15am. As tropical systems tend to do, Isaac has been "wobbling" along the Louisiana state line which is making forecasts a bit tough on the exact path of this storm. That being said, it is confident that Isaac will drift west-northwest through today before turning more north-northwest late today followed by a northeast turn Thursday and into Friday.

That forecast doesn't come with some error, however. Do the the uncertain drift of Isaac to thewest, some computer models are drifting Isaac closer to the Louisiana / Texas State line -- some of which even bringing the center of circulation into Texas by Thursday. These models are picking up on a slight weakness in the ridge of high pressure to the northwest -- which is forecast to move east in the next 24 hours -- which could pick up Isaac and drift the storm west through part of today.

We'll have to watch the movement of Isaac closely, as a more westerly movement may be close enough to produce a few showers in the Brazos Valley by Thursday afternoon (at least in our eastern counties). For now, expect breezy to gusty winds (25mph to 30mph gusts possible) today and Thursday -- with a 30% chance of scattered, spotty showers tomorrow afternoon. (Below is our in-house PinPoint Forecast. Note the circulation just to the northeast of the Brazos Valley -- that is our computer model picking up on the center of the remnants of Isaac moving into East Texas. That, of course, is just one solution out there that we use to make our forecast.)

Next update from the National Hurricane Center is due in at 10am -- we'll get an updated official forecast path then as well.

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