Dr. Jeff Masters' WunderBlog

Alex Becomes a Hurricane
Posted by: Dr. Jeff Masters, 02:57 AM GMT del 30 Giugno 2010 +3
Hi, Dr. Rob Carver filling in for Jeff on the late shift.

430AM EDT Update
The 400AM EDT advisory package has hit the wires. Alex' center of circulation is located at 23.3N, 95.1W, which is 175 miles east of La Pesca, MX and 235 miles southeast of Brownsville, TX. Alex is responding to a weakness in the ridge to it's north, the storm motion has shifted to WNW at 7 mph. The winds are unchanged from the 100AM advisory, they are still 80 mph. However, Alex continues to deepen it's pressure, the minimum central pressure is 961 mb. Hurricane force winds now extend to 30 miles away from the center, and tropical force winds extend to 200 miles from the center. Alex is currently over warm ocean waters and under weak vertical shear, so the winds are forecast to increase. However, given the strength of Alex's central pressure, there is a small possibility of a rapid intensification of an additional 35 mph.

I haven't changed my risk assessment with this advisory. Flooding from rain still remains the greatest hazard posed by Alex. Tropical storm force winds are expected to reach the coast later this morning. People should plan on finishing their outdoor preparations by this time.

150 AM Update As of the 100AM EDT advisory, Alex is at 23.1N, 94.8W. The minimum central pressure is 972 mb, and the winds have increased to 80 mph. Alex is slowly moving westwards at 5 mph in an "erratic" fashion.

As of the 11PM EDT advisory, NHC has upgraded Alex to a hurricane with maximum winds of 75 mph and a minimum central pressure of 973 mb. Alex's center is at 23.1N, 94.8W, which is 255 miles south of Brownsville, TX and 195 miles east-southeast of La Pesca, MX. Alex is moving westwards at 9 mph. Alex is expected to slightly alter it's course to the WNW before making landfall south of the Rio Grande. The winds are also forecast to pick up to 90 mph before landfall. In any event, mandatory evacuation orders have been issued for recreational vehicles and other high-profile vehicles in county parks on South Padre Island. A voluntary evacuation is in place for residents of South Padre Island and Port Isabel.

Threat from storm surge
NHC is forecasting a 3-5 foot storm surge north of the eye as Alex makes landfall.

Threat from wind
NWS forecasters expect that damage from Alex's winds will be limited to the southern counties of Cameron, Willacy, and Hidalgo. Hurricane force winds extend 15 miles from the storm center, but tropical storm force winds extend 175 miles from the center. This is a rather large circulation. The Storm Prediction Center is monitoring southern Texas for the threat of tornadoes in the outer rainbands as Alex makes landfall. I'd expect a tornado watch to be issued around noon CDT.

Threat from rain
This is the most significant impact from Alex. Rainfall totals of 6 to 12 inches are expected over northern Mexico/southern Texas with 20 inches possible in some locations. There will be flooding from this storm. If more than 5 inches fall in 6 hours, there will likely be flash flooding. The NWS office in Brownsville is advising people who were flooded out by Dolly in 2008 to evacuate to higher ground now.


Satellite-derived rainfall estimates for Alex's passage over the Yucatan peninsula on June 28, 2010. Data provided by the Climate Prediction Center.

Alex is the first Atlantic June hurricane since 1995's Allison. The storm tally for that season was 19 named storms, 11 hurricanes, and 5 major hurricanes. It will be interesting to see how this season compares to 1995.

Next update
I'll have an update Wednesday evening/night. Jeff will have an update sometime tomorrow morning.

Categories: Hurricane
  Permalink | A A A
Reader Comments
Display: 0, 50, 100, 200 Sort: Newest First - Order Posted
Viewing: 1551 - 1591

Page: 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 — Blog Index

1552. Thundercloud01221991 02:20 PM GMT del 30 Giugno 2010    
Quoting MiamiHurricanes09:
When it peaks prior to landfall you will likely see some 949-940mb readings, you might even see some 930s.


if we get into 930's that usually is equal to cat 4/5 right
Member Since: Agosto 1, 2006 Posts: 28 Comments: 3673
1553. Skyepony (Mod) 02:20 PM GMT del 30 Giugno 2010    
958.3 mb
(~ 28.30 inHg)

23.817N 95.417W


That's more N than W of the last fix
Member Since: Agosto 10, 2005 Posts: 144 Comments: 29374
1554. Thundercloud01221991 02:21 PM GMT del 30 Giugno 2010    
turned into NE quadrant meaning we will see how high these winds are... before 11 AM
Member Since: Agosto 1, 2006 Posts: 28 Comments: 3673
1555. Patrap 02:21 PM GMT del 30 Giugno 2010    
Member Since: Luglio 3, 2005 Posts: 372 Comments: 111633
1556. MiamiHurricanes09 02:21 PM GMT del 30 Giugno 2010    
958.3mb pressure reading was located at: 23.4°N 95.2°W. The 8AM intermediate advisory center fix was at: 23.4°N 95.3°W.

Alex is obviously stationary, and believe it or not drifting slowly eastward.
Member Since: Settembre 2, 2009 Posts: 129 Comments: 19976
1557. powerlineman2 02:21 PM GMT del 30 Giugno 2010    
its goin to mexico accept it and move on
Member Since: Giugno 24, 2010 Posts: 0 Comments: 30
1558. Orcasystems 02:23 PM GMT del 30 Giugno 2010    
If I lived close to Brownsville Texas.. this northern shift would bother me... a lot



AOI
Member Since: Ottobre 1, 2007 Posts: 77 Comments: 26077
1559. cyclonekid 02:23 PM GMT del 30 Giugno 2010    
7am CDT Intermediate Advisory
Information via the National Hurricane Center







Member Since: Luglio 14, 2009 Posts: 51 Comments: 1629
1561. weathermanwannabe 02:23 PM GMT del 30 Giugno 2010    
Always good to remember that a few degrees of variation or wobble, as a storm is approching landfall, can mean a difference of a few hundred miles in terms of the eyewall...But, to my eyes, the current "drift" appears to be towards the North a bit but still within the cone.....Agree with Storm that we might see a general "border" area landfall give or take a hundred miles on either side (more impacts felt in Texas).
Member Since: Agosto 8, 2006 Posts: 0 Comments: 6703
1562. Max1023 02:23 PM GMT del 30 Giugno 2010    
1556 - No, it is still moving NW-NNW, the intermediate position was based on satellite estimates and was off a couple tenths of a degree. It is moving slowly however.
Member Since: Luglio 22, 2008 Posts: 1 Comments: 286
1564. NewYork4Life 02:24 PM GMT del 30 Giugno 2010    
Quoting Thundercloud01221991:


if we get into 930's that usually is equal to cat 4/5 right


900mb is not out of the question..
Member Since: Settembre 11, 2008 Posts: 0 Comments: 59
1565. mtyweatherfan90 02:24 PM GMT del 30 Giugno 2010    
Quoting FLdewey:
Geez the Northwishing won't stop until landfall in Mexico... heck maybe even after landfall.


LOL! True! ;)
Member Since: Luglio 9, 2008 Posts: 8 Comments: 334
1566. mcluvincane 02:25 PM GMT del 30 Giugno 2010    
Quoting MiamiHurricanes09:
958.3mb pressure reading was located at: 23.4°N 95.2°W. The 8AM intermediate advisory center fix was at: 23.4°N 95.3°W.

Alex is obviously stationary, and believe it or not drifting slowly eastward.



That should put a kinck in the NHC projected path. This could get real interesting.
Member Since: Giugno 2, 2010 Posts: 0 Comments: 1315
1567. nrtiwlnvragn 02:25 PM GMT del 30 Giugno 2010    
NEW BLOG
Member Since: Settembre 23, 2005 Posts: 11 Comments: 8944
1568. reedzone 02:25 PM GMT del 30 Giugno 2010    
Just woke up, pointed my curser at the center of the storm of the floater from last night, refreshed it, and it has moved an inch! Not just that, but a NW movement, Amazing storm.
Member Since: Luglio 1, 2008 Posts: 13 Comments: 7247
1569. RitaEvac 02:25 PM GMT del 30 Giugno 2010    
from radar view, the eye from an Xtrap point of view would take it north of Brownsville
Member Since: Luglio 14, 2008 Posts: 1 Comments: 8912
1570. jpsb 02:26 PM GMT del 30 Giugno 2010    
Quoting MiamiHurricanes09:
958.3mb pressure reading was located at: 23.4°N 95.2°W. The 8AM intermediate advisory center fix was at: 23.4°N 95.3°W.

Alex is obviously stationary, and believe it or not drifting slowly eastward.
Looking at Pat's radar, motion appears to be NW. Are you seeing something different?
Member Since: Giugno 30, 2009 Posts: 0 Comments: 578
1571. MiamiHurricanes09 02:26 PM GMT del 30 Giugno 2010    
Quoting Max1023:
1556 - No, it is still moving NW-NNW, the intermediate position was based on satellite estimates and was off a couple tenths of a degree. It is moving slowly however.
Just pointing out the coordinates between center fixes, and I believe that the 8AM advisory position was from Recon and not satellite. Either way Alex seems to be moving very slowly.
Member Since: Settembre 2, 2009 Posts: 129 Comments: 19976
1573. HurricaneNewbie 02:26 PM GMT del 30 Giugno 2010    
new blog
Member Since: Settembre 11, 2009 Posts: 0 Comments: 263
1574. MiamiHurricanes09 02:26 PM GMT del 30 Giugno 2010    
NEW BLOG!
Member Since: Settembre 2, 2009 Posts: 129 Comments: 19976
1575. watchingnva 02:27 PM GMT del 30 Giugno 2010    


definitely a shift...still going to Mexico...
Member Since: Settembre 7, 2005 Posts: 3 Comments: 1310
1576. txalwaysprepared 02:30 PM GMT del 30 Giugno 2010    
No northwishing here... Some would just like to know how much weather we will get from this storm. The further north it goes the more severe/weather some of us will get. 100 miles can make a difference
Member Since: Agosto 18, 2007 Posts: 0 Comments: 1642
1577. LaCoast 02:31 PM GMT del 30 Giugno 2010    
Hey STORMW
Could you give us your thoughts on this supposed weakness in the ridge. Even if it exists does it really have a major influence on the steering of Alex. I don't see a stall and I don't see a true NW. I still see a WNW. Just a reminder to all picking apart the SAT's frame by frame is very deceiving. The earth is round and huge.
1578. Asta 02:33 PM GMT del 30 Giugno 2010    
WATER VAPOR
Member Since: Luglio 4, 2008 Posts: 30 Comments: 1018
1579. Asta 02:34 PM GMT del 30 Giugno 2010    
IR
Member Since: Luglio 4, 2008 Posts: 30 Comments: 1018
1580. Asta 02:36 PM GMT del 30 Giugno 2010    
Member Since: Luglio 4, 2008 Posts: 30 Comments: 1018
1581. Asta 02:40 PM GMT del 30 Giugno 2010    
Member Since: Luglio 4, 2008 Posts: 30 Comments: 1018
1582. Asta 02:42 PM GMT del 30 Giugno 2010    
Member Since: Luglio 4, 2008 Posts: 30 Comments: 1018
1583. blueyedhrlyridr 02:50 PM GMT del 30 Giugno 2010    
With the steering bieng so weak, is there a chance this storm could possibly ride up the coast. Just curious
Member Since: Luglio 15, 2008 Posts: 0 Comments: 76
1584. WindNoise 02:53 PM GMT del 30 Giugno 2010    
Quoting mcluvincane:



That should put a kinck in the NHC projected path This could get real interesting.

If that is true should New Orleans Start Evac? Way to soon to say east movement.
Member Since: Agosto 19, 2007 Posts: 0 Comments: 50
1585. snotly 03:00 PM GMT del 30 Giugno 2010    
I wonder if the storm can wobble if most of the convection gets forced to one side because of dry air.
Member Since: Agosto 27, 2005 Posts: 0 Comments: 668
1586. ShenValleyFlyFish 03:04 PM GMT del 30 Giugno 2010    
Quoting watchingnva:


definitely a shift...still going to Mexico...


You'd best be putting up a big disclaimer and cropping out their logo you go coloring on government maps.
Member Since: Settembre 9, 2007 Posts: 36 Comments: 4684
1587. Asta 03:05 PM GMT del 30 Giugno 2010    
Member Since: Luglio 4, 2008 Posts: 30 Comments: 1018
1588. StormChaser81 04:39 PM GMT del 30 Giugno 2010    
Quoting watchingnva:


definitely a shift...still going to Mexico...


Probably a decent wobble. It;s going to continue to wobble too.
Member Since: Agosto 11, 2008 Posts: 0 Comments: 2315
1589. NortheastGuy 06:04 PM GMT del 30 Giugno 2010    
To follow the NHC forecast path Alex is going to have to slam on it's brakes and make a sharp left, after speeding up a little to the NW.
Member Since: Agosto 26, 2009 Posts: 0 Comments: 80
1590. redwagon 09:29 PM GMT del 30 Giugno 2010    
Saved as favorite - Thank You!
Member Since: Agosto 4, 2007 Posts: 0 Comments: 1444
1591. KEEPEROFTHEGATE (Mod) 09:32 PM GMT del 30 Giugno 2010    
01L/H/A/C2
MARK(APPROACHING LANDFALL)
24.6N/97.1W
Member Since: Luglio 15, 2006 Posts: 144 Comments: 40659

Viewing: 1551 - 1591

Page: 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 — Blog Index

New Comment
Community Standards Policy Comments will take a few seconds to appear.
Post Your Comments
Please sign in to post comments.
Not only will you be able to leave comments on this blog, but you'll also have the ability to upload and share your photos in our Wunder Photos section.
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.

Community Activity