Second warmest March on record; will La Niña be gone by hurricane season?
March 2008 was the 2nd warmest March for the the globe on record, according to statistics released by the National Climatic Data Center. Over the Northern Hemisphere, and over all of the globe's land areas, March 2008 was the warmest March in the 128-year global record. Only the presence of a moderately strong La Niña event that cooled ocean waters in the central and eastern equatorial Pacific prevented March 2008 from surpassing March 2002 as the warmest March on record. March broke a string of three straight months when the globe did not record a top ten warmest month ever. Between February 2006 and November 2007, the globe set top ten monthly warm temperature records for 22 straight months.
Figure 1. Departure of temperature from average (the anomaly) for March of 2008, the second warmest March on record for the globe. While the U.S. recorded slightly below average temperatures, much of Asia and Europe saw remarkably warm temperatures. Image credit: National Climatic Data Center.
How much cooling did La Niña give to the globe in March?
La Niña is a periodic cooling of the Equatorial waters of the Eastern Pacific that occurs every 3-7 years. The cooling is due to a natural cycle of anomalous winds from the east that act to push surface waters away from the coast of South America, allowing cold water from deep in the ocean to rise to the surface to replace the surface waters blown to the west. These cool waters often cause a noticeable drop in global temperatures. Conversely, when the opposite phenomena occurs--an El Niño event, which brings anomalously warm Sea Surface Temperatures (SSTs) to the Equatorial Eastern Pacific, enough heat is added to the atmosphere that global temperatures warm significantly. According to Trenberth et al. (2002), a typical El Niño event increases global temperatures by about 0.1°C. Exceptional El Niño events, such as occurred in 1997-1998 and 1982-1983, increase global temperatures by up to 0.2°C. El Niño events heat the atmosphere by causing changes in cloudiness and atmospheric circulation, and through direct radiation of heat from the ocean to the atmosphere. There is a lag of 3-6 months between the time an El Niño event occurs and the time the atmosphere heats in response. Similarly, when a La Niña event occurs, heat is drawn out of the atmosphere and the oceans are recharged with heat. Global temperatures cool, again with a lag of 3-6 months. The correlation between global temperature anomalies and El Niño/La Niña temperature anomalies can be plainly seen in Figure 2. Note that the correlation is not perfect--there are some El Niño/La Niña events that do not affect the global temperature much. For example, global temperatures did not cool much during the strong 1988-1989 La Niña event. Therefore, it is a good bet--but not certain one--that had we not had a strong La Niña event this winter, March 2008 would have been the warmest March on record, since it missed the record by only 0.04°C.
Figure 2. Comparison of temperature anomalies in the equatorial Pacific Ocean bounded by a box between 5°S, 5°N, 120°W, and 180°W (the Niño 3.4 region) and global temperatures for 1950-1998. Means for 1950-1976 and 1977-1998 (horizontal lines) are shown separately to highlight a climate shift that occurred in 1976/1977. The reasons for this shift are unknown. Note that when an El Niño event occurs, the globe tends to warm by about 0.1°C, and when a La Niña event occurs, the globe tends to cool. Image credit: American Geophysical Union's Journal of Geophysical Research.
Warmest month ever stats
It is interesting to compare what the phase of El Niño/La Niña was during each of the 12 record warmest months the globe has recorded. If we adjust for the 3-6 month lag between an El Niño/La Niña event and the monthly global temperature records, it turns out that nine of the twelve monthly records were set when an El Niño event occurred during the 3-6 month period prior to the record. Considering that climatologically El Niño conditions are present only about 25% of the time, El Niño has a major impact on when record global warmth will occur. The warmest year on record, 1998, occurred during the strongest El Niño of the past century. The table below compares the 12 monthly global temperature records with the temperature in the Niño 3.4 region (a 3-month average centered four months before the record was set). El Niño events, which occur when the Niño 3.4 index is greater than 0.4°C, are marked with an "E".
Record......Niño 3.4 index
-----------------------------
Jan 2007 +0.7 E
Feb 1998 +1.7 E
Mar 2002 -0.1
Apr 1998 +2.5 E
May 1998 +2.3 E
Jun 2005 +0.5 E
Jul 1998 +1.4 E
Aug 1998 +1.1 E
Sep 2005 +0.5 E
Oct 2003 +0.0
Nov 2004 +0.7 E
Dec 2003 +0.4
Figure 3. A La Niña event exists when ocean surface temperatures in the equatorial Pacific Ocean bounded by a box between 5°S, 5°N, 120°W, and 180°W (the Niño 3.4 region) are cooler than 0.4°C below average (based on means from 1971-2000). La Niña events between 0.5°C and 0.9°C are referred to as weak, 1.0°C and 1.4°C are moderate, and 1.5°C or cooler, strong. The winter of 2007-2008 saw strong La Niña conditions, but this has weakened to a moderate event in March. Image credit: NOAA Climate Prediction Center.
An El Niño by hurricane season?
Presence of El Niño conditions usually causes enhanced levels of wind shear over the Atlantic, reducing hurricane activity, so it would be nice to see an El Niño this Fall. The strong La Niña event we had over the past winter has weakened considerably in the past two months, and is now classified as a moderate event, according to the latest El Niño discussion issued by NOAA's Climate Prediction Center. There is some hope that an El Niño will develop by hurricane season. Two of the long-range computer models are now calling for an El Niño to develop by hurricane season (Figure 4), and none of them were calling for El Niño last month. However, there is probably not time for a full-fledged El Niño event to develop, and it is expected that we will have weak La Niña or neutral conditions this hurricane season. Since reliable El Niño records began in 1950, there has never been a switch over to El Niño by hurricane season from a La Niña as strong as the one we have now. Columbia University's International Research Institute is predicting that neutral El Niño conditions are most likely for the coming hurricane season (57% chance), with a 20% chance of an El Niño, and 23% chance of a La Niña. This is pretty much what climatology says--on average, we experience El Niño conditions 25% of the time and La Niña conditions 25% of the time.
Figure 4. Computer model forecasts of El Niño/La Niña made in April. The forecasts that go above the red line at +0.5°C denote El Niño conditions; -0.5°C to +0.5°C denote neutral conditions, and below -0.5°C denote La Niña conditions. Image credit: Columbia University's IRI.
References
Trenberth, K. E., J. M. Caron, D. P. Stepaniak, and S. Worley, >Evolution of El Niño, Southern Oscillation and global atmospheric surface temperatures", J. Geophys. Res., 107(D8), 4065, doi:10.1029/2000JD000298, 2002.
I'll be in Orlando next week for the American Meteorological Society's bi-annual hurricane conference, and plan to make some quick posts during the week to update everyone on the latest hurricane research. I may make one more post before then.
Jeff Masters
Reader Comments
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http://wavcis.csi.lsu.edu/ Link
(The Tropical Weather Link on this page is the wunderground tropical page)
It's an invest.
I thought it was at least a minimal tropical storm
Thanks Terra
NEXRAD Radar
New Orleans Base Reflectivity 0.50 Degree Elevation Range 124 NMI Link
LIGHT TO MODERATE TRADEWINDS ARE OVER THE CARIBBEAN SEA WITH
MOSTLY FAIR WEATHER W OF 75W. BROKEN TO OVERCAST MULTILAYERED
CLOUDS WITH SCATTERED SHOWERS ARE OVER THE E CARIBBEAN MAINLY
E OF 70W. THIS ACTIVITY IS ASSOCIATED WITH A SFC TROUGH
EXTENDING ALONG 63/64W ON THE 12Z MAP AND A MID/UPPER LEVEL
TROUGH LOCATED OVER THE WEST-CENTRAL ATLC JUST N OF PUERTO RICO.
False Color WV,GOES-12 Link
A lot of low level cloud cover there; Drak...here's the LSU lower level clouds product that shows it better:
LSU EarthScan Low Level Clouds
It is likely associated with a cold front. It does not have a low pressure marked with it. It looks more like moisture being thrown up in advance of the front.
need I say more????
Low pressure is Low Pressure..Baroclinic in nature or both.
The moisture is welcome.
You live in Virginia? Don't worry; the time for severe weather in the east is closing in. You can expect more slight risks coming weeks.
Looks like monday may be your day, in any case.
715. Drakoen 3:39 PM EDT on April 26, 2008
A lot of low level cloud cover there; Drak...here's the LSU lower level clouds product that shows it better:
LSU EarthScan Low Level Clouds
Yea. I'm expecting the moisture to increase as showing on the GFS 12z run today with the increase in the Theta-e values. Not expecting any development as the upper level winds are going to be unfavorable but it maybe a sign of things to come.
850mb Vorticity
West Atlantic Link
I know they probably get tired of me asking questions, but I can generally count on several to give some kind of answer. I'll tell what's interesting - is when a question that's asked, or topic discussed, and the answers that come back. All will have great comments, but each may add a little something different to the question. That makes for a "whole" and new perspective that I think, ultimately, we all benefit more from! There have been some really good discussions.
no area of low pressure over Louisiana its just a surface trough
Actually I thought the surface trough WAS an area of low pressure.
No. A trough is a broad and open region of lower pressures along the axis along with an inverted signature. A low is a focused region of low pressure that can be closed or nearly closed.
NWS Forecast
FZUS54 KLCH 262002
CWFLCH
COASTAL WATERS FORECAST
NATIONAL WEATHER SERVICE LAKE CHARLES LA
302 PM CDT SAT APR 26 2008
COASTAL WATERS FROM LOWER ATCHAFALAYA TO HIGH ISLAND TX
GMZ400-271115-
SYNOPSIS FOR LOWER ATCHAFALAYA TO HIGH ISLAND TX OUT 60
NAUTICAL MILES
302 PM CDT SAT APR 26 2008
SYNOPSIS FOR LOWER ATCHAFALAYA TO HIGH ISLAND TX OUT 60 NM
A COLD FRONT WITH SHOWERS AND THUNDERSTORMS WILL MOVE
ACROSS THE NORTHWEST GULF SUNDAY AFTERNOON AND EVENING. A STRONG
AND GUSTY OFFSHORE FLOW WILL FOLLOW IN ITS WAKE.
Doesn't look to be working right at the moment.
is it trending WEST?
NEXRAD Radar
Lake Charles Base Reflectivity 1.45 Degree Elevation Range 124 NMI Link
TROPICAL LAGNIAPPE is a quick access blog I've put together of WU's very knowledgeable "weather bloggers." I include this blog within my blog and will post in the main blog periodically for others (if they haven't picked up on them yet) to get "a little something extra" for good, credible and current tropical information. These are links to some of WU's respected and reliable weather-casting members. Please visit their comprehensive sites. I ALWAYS learn something each and every time I visit them!
There are others, too, that I haven't got around to adding here yet, but I will gladly add to the blog. Some good folks here and they are happy to answer questions - all you have to do is simply ask!
NEXRAD Radar
New Orleans Base Reflectivity 0.50 Degree Elevation Range 248 NMI Link
this info is based on current obsevations analsis of surface conditions and depictions based on the gem global models
Viewing: 701 - 751
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