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Archives >> 2009 News Talkbacks

danielwAdministrator
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Reged: Wed
Posts: 3502
Loc: Hattiesburg,MS (31.3N 89.3W)
Re: Gulf Low
      Mon May 25 2009 08:17 AM

Closed Low
A low pressure area with a distinct center of cyclonic circulation which can be completely encircled by one or more isobars or height contour lines. The term usually is used to distinguish a low pressure area aloft from a low-pressure trough. Closed lows aloft typically are partially or completely detached from the main westerly current, and thus move relatively slowly (see Cutoff Low).

http://forecast.weather.gov/glossary.php?word=CLOSED%20LOW

A closed low has several characteristics. Closed lows tend to be deep pressure systems with one or more height contours encircling them on the analysis charts at all levels in the troposphere. A closed low is occluded and vertically stacked. Because the low is closed, it does not generate much PVA and NVA. The vort max will be near the center of rotation. It is difficult to get a windflow that produces vorticity advection because the vorticity isopleths for the most part are parallel to the height contours. The weather associated with closed lows tends to be cloudy with showers in the vicinity of the low's center. Closed lows are often slow movers but can move quickly if they are embedded within the jet stream. Cloudy and rainy weather can persist with the slow movers. Thermal advection tends to be weak with closed lows since they are occluded. A special case of the closed low is the cut-off low. A cut-off low moves slowly since the jet stream winds aloft are displaced away from the low and are thus not able to move it along.

http://www.theweatherprediction.com/habyhints/200/

closed low—A low that may be completely encircled by an isobar or contour line.
(This means an isobar or contour line of any value, not necessarily restricted to those arbitrarily chosen for the analysis of the chart.) Strictly, all lows are closed. However, in weather-map analysis terminology, this designation is used commonly in two respects: 1) on surface charts, to distinguish a low from a trough, especially as a low develops within the trough; and 2) on upper-level charts, to accentuate the fact that the circulation is closed, especially at levels and over latitudes where such an occurrence is unusual. The definition of closed high is analogous.

http://amsglossary.allenpress.com/glossary/search?id=closed-low1

http://www.google.com/search?hl=en&q="closed+Low"&aq=f&oq=&aqi=g1

Most of the Closed Low definitions require a vertically stacked system. Learn something new everyday.

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Entire topic
Subject Posted by Posted on
* Gulf Low MikeCAdministrator Mon May 25 2009 08:17 AM
. * * Re: great video MichaelA   Tue May 26 2009 11:05 AM
. * * Re: great video HCW   Tue May 26 2009 09:51 AM
. * * Re: great video metwannabe   Tue May 26 2009 09:25 AM
. * * Re: great video mikethewreck   Tue May 26 2009 03:47 AM
. * * great video LoisCane   Tue May 26 2009 12:09 AM
. * * Re: Gulf Low HCW   Mon May 25 2009 05:02 PM
. * * Re: Gulf Low danielwAdministrator   Mon May 25 2009 08:17 AM
. * * Re: Gulf Low cieldumort   Sat May 23 2009 05:16 PM
. * * Re: Gulf Low danielwAdministrator   Sat May 23 2009 04:30 PM
. * * Re: Gulf Low Storm Hunter   Sat May 23 2009 12:01 PM
. * * Re: Gulf Low JoshuaK2   Sat May 23 2009 11:55 AM
. * * Re: Gulf Low mbfly   Sat May 23 2009 08:49 AM
. * * Re: Gulf Low danielwAdministrator   Sat May 23 2009 02:11 AM
. * * Re: Gulf Low Bloodstar   Sat May 23 2009 01:04 AM
. * * Re: Gulf Low cieldumort   Sat May 23 2009 12:57 AM
. * * Re: Gulf Low Storm Cooper   Fri May 22 2009 07:54 PM
. * * Re: Gulf Low Hugh   Fri May 22 2009 07:16 PM
. * * Re: Gulf Low LoisCane   Fri May 22 2009 06:14 PM
. * * Re: Gulf Low Storm Hunter   Fri May 22 2009 05:13 PM
. * * Re: Gulf Low Marknole   Fri May 22 2009 03:20 PM
. * * Re: Gulf Low HCW   Fri May 22 2009 11:22 AM
. * * Re: Gulf Low scottsvb   Fri May 22 2009 12:33 AM
. * * Re: Gulf Low JoshuaK   Thu May 21 2009 04:44 PM
. * * Re: Gulf Low Storm Hunter   Thu May 21 2009 02:58 PM
. * * Re: Gulf Low danielwAdministrator   Thu May 21 2009 02:11 PM
. * * Re: Gulf Low MikeCAdministrator   Thu May 21 2009 01:17 PM
. * * Re: Gulf Low key   Thu May 21 2009 12:47 PM
. * * Re: Watching Area in the Gulf for Development vineyardsaker   Thu May 21 2009 10:14 AM
. * * Re: Watching Area in the Gulf for Development JMII   Wed May 20 2009 06:33 PM
. * * Watching Area in the Gulf for Development danielwAdministrator   Wed May 20 2009 05:32 PM
. * * Re: Early! Watching Area in the Gulf for Development JoshuaK   Wed May 20 2009 01:37 PM
. * * Re: Early! Watching Area in the Gulf for Development scottsvb   Wed May 20 2009 12:40 PM
. * * Re: Early! Watching Area in the Gulf for Development vineyardsaker   Wed May 20 2009 11:58 AM
. * * Re: Early! Watching Area in the Gulf for Development JoshuaK   Wed May 20 2009 01:45 AM
. * * Re: Early! Watching Area in the Gulf for Development docrod   Tue May 19 2009 11:34 PM
. * * Re: Early! Watching Area in the Gulf for Development scottsvb   Tue May 19 2009 04:50 PM
. * * Re: Early! Watching Area in the Gulf for Development weatherguy08   Tue May 19 2009 12:30 PM
. * * Re: Early! Watching Area in the Gulf for Development scottsvb   Tue May 19 2009 10:01 AM
. * * Re: Early! Watching Area in the Gulf for Development HCW   Tue May 19 2009 09:52 AM
. * * Re: Early! Watching Area in the Gulf for Development adam s   Tue May 19 2009 09:25 AM
. * * Re: Early! Watching Area in the Gulf for Development Rick99   Tue May 19 2009 09:12 AM
. * * Re: Early! Watching Area in the Gulf for Development docrod   Tue May 19 2009 12:28 AM
. * * Re: Early! Watching Area in the Gulf for Development LoisCane   Mon May 18 2009 10:24 PM
. * * Re: Early! Watching Area in the Gulf for Development docrod   Mon May 18 2009 09:37 PM
. * * Re: Early! Watching Area in the Gulf for Development k___g   Mon May 18 2009 09:29 PM
. * * Re: Early! Watching Area in the Gulf for Development mikethewreck   Mon May 18 2009 09:14 PM
. * * Re: Early! Watching Area in the Gulf for Development docrod   Mon May 18 2009 08:07 PM
. * * Re: Early! Watching Area in the Gulf for Development k___g   Mon May 18 2009 08:00 PM
. * * Re: Early! Watching Area in the Gulf for Development Storm Hunter   Mon May 18 2009 07:25 PM
. * * Re: Early! Watching Area in the Gulf for Development docrod   Mon May 18 2009 07:00 PM
. * * Re: Early! Watching Area in the Gulf for Development rhendryx   Mon May 18 2009 06:51 PM
. * * Re: Early! Watching Area in the Gulf for Development MichaelA   Mon May 18 2009 04:53 PM
. * * Re: Early! Watching Area in the Gulf for Development MikeCAdministrator   Mon May 18 2009 04:28 PM
. * * Re: Early! Watching Area in the Gulf for Development MikeCAdministrator   Mon May 18 2009 02:27 PM
. * * Re: Early! Watching Area in the Gulf for Development Lois   Mon May 18 2009 02:20 PM
. * * Re: Early! Watching Area in the Gulf for Development byrdlh   Mon May 18 2009 02:13 PM
. * * Re: Early! Watching Area in the Gulf for Development LoisCane   Mon May 18 2009 01:27 PM
. * * Re: Early! Watching Area in the Gulf for Development weathernet   Mon May 18 2009 01:05 PM
. * * Re: Early! Watching Area in the Gulf for Development LoisCane   Mon May 18 2009 11:51 AM
. * * Re: Early! Watching Area in the Gulf for Development JoshuaK   Mon May 18 2009 10:57 AM
. * * Re: Early! Watching Area in the Gulf for Development Beach   Mon May 18 2009 09:59 AM
. * * Re: Early! Watching Area in the Gulf for Development MichaelA   Mon May 18 2009 09:39 AM
. * * Re: Early! Watching Area in the Gulf for Development scottsvb   Mon May 18 2009 12:22 AM
. * * Re: Early! Watching Area in the Gulf for Development cchsweatherman   Sun May 17 2009 11:03 PM
. * * Re: Development in Cuba Jamaica Area LoisCane   Sun May 17 2009 11:03 PM
. * * Re: Development in Cuba Jamaica Area Storm Hunter   Sun May 17 2009 10:49 PM
. * * Re: Development in Cuba Jamaica Area craigm   Sun May 17 2009 09:24 PM
. * * Re: Development in Cuba Jamaica Area HCW   Sun May 17 2009 08:36 PM
. * * Re: Development in Cuba Jamaica Area JoshuaK   Sun May 17 2009 07:19 PM
. * * Re: Development in Cuba Jamaica Area LoisCane   Sun May 17 2009 07:18 PM
. * * Re: Development in Cuba Jamaica Area Lamar-Plant City   Sun May 17 2009 07:10 PM
. * * Re: Development in Cuba Jamaica Area danielwAdministrator   Sun May 17 2009 04:57 PM
. * * Re: Development in Cuba Jamaica Area JoshuaK   Sun May 17 2009 04:42 PM
. * * Re: Development in Cuba Jamaica Area weathernet   Sun May 17 2009 04:35 PM
. * * Re: Development in Cuba Jamaica Area danielwAdministrator   Sun May 17 2009 01:25 PM
. * * Re: Development in Cuba Jamaica Area MichaelA   Sun May 17 2009 01:21 PM
. * * Re: Development in Cuba Jamaica Area weathernet   Sun May 17 2009 12:58 PM
. * * Re: Development in Cuba Jamaica Area Storm Cooper   Sun May 17 2009 12:29 PM
. * * Re: Development in Cuba Jamaica Area danielwAdministrator   Sun May 17 2009 12:19 PM
. * * Development in Cuba Jamaica Area danielwAdministrator   Sun May 17 2009 09:31 AM
. * * Re: Early! Watching Area in the Gulf for Development MikeCAdministrator   Sun May 17 2009 09:30 AM
. * * Re: Early! Watching Area in the Gulf for Development scottsvb   Sun May 17 2009 12:32 AM
. * * Re: Early! Watching Area in the Gulf for Development JoshuaK   Sat May 16 2009 10:52 PM
. * * Re: Early! Watching Area in the Gulf for Development docrod   Sat May 16 2009 09:43 PM
. * * Re: Early! Watching Area in the Gulf for Development scottsvb   Sat May 16 2009 09:21 PM

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