95L fizzles; Sierras brace for 5-10 feet of snow

By: Dr. Jeff Masters , 31. joulukuuta 2007 klo 00:10 (GMT)

Share this Blog
2
+

A non-tropical low pressure system dubbed Invest 95L, near 27N 38W, way out in the middle of the Atlantic Ocean, has gotten less organized since yesterday. The storm cut off from the jet stream and acquired some subtropical characteristics yesterday, as it sat nearly stationary over waters of 22-23° C. However, satellite imagery shows fewer heavy thunderstorms than yesterday, and the storm has a more extratropical appearance as it interacts with a cold front to its north.

This evening's QuikSCAT pass showed winds up to 50 mph on the west side of 95L. Wind shear is about 30 knots over 95L, and this shear is expected to be 20-40 knots for the next two days. This is probably too high to allow 95L to develop into a subtropical storm, and wind shear is forecast to grow stronger as the storm begins moving west-southwest on Tuesday. By Thursday, a trough of low pressure is expected to recurve 95L northeastward, and the storm is not expected to affect any land areas.

Huge blizzard expected in the California Sierras
One of the most severe blizzards of the past 50 years is expected to affect California's Sierra Mountains beginning Thursday night, January 3. A powerful low pressure system will establish itself off the coast of Oregon, and bring a series of heavy snow events with blizzard conditions to the Sierras through Monday. Five to ten feet of snow are possible in the high mountains. Travel will be nearly impossible in the high country next weekend, with white-out conditions and wind gusts near hurricane strength. This is going to be a great storm for filling the reservoirs that supply the northern half of the state with its water. Reservoirs should be at full capacity next summer, easing fears of a significant water shortage. Last winter's snows failed to fill the reservoirs to even 50% of capacity.


Figure 1. Estimated rainfall for December 30 for Georgia. Atlanta got one of its heaviest rains of the year today.

Happy New Year! I'll be back January 2 to talk about the Georgia drought. Heavy rains that fell today may have been just enough to keep Atlanta from setting a record for its driest year since record keeping began in 1930.

Jeff Masters

Reader Comments

Comments will take a few seconds to appear.

Post Your Comments

Please sign in to post comments.

or Join

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.

Display: 0, 50, 100, 200 Sort: Newest First - Order Posted

Viewing: 230 - 180

Page: 1 | 2 | 3 | 4 | 5Blog Index

230. Cavin Rawlins
1. tammikuuta 2008 klo 15:53 (GMT)
Taz, i will have blog on it 2morrow....the TWC was talking about it.
Member Since: 24.07.2005 Posts: 407 Comments: 19076
229. Tazmanian
1. tammikuuta 2008 klo 15:21 (GMT)
update for 456 i got a 954mb storm comeing my way and the winds went up from 65 on monday to a round 70kt with tuesday update this is going to be a vary powerfull wind storm



AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SACRAMENTO CA
400 AM PST TUE JAN 1 2008



A VERY POWERFUL STORM WILL THEN MOVE ACROSS THE REGION FRIDAY AND
FRIDAY NIGHT. 00Z GFS HAD A 954MB SURFACE LOW OFF VANCOUVER ISLAND
FRIDAY AFTERNOON...06Z GFS IS WEAKER BUT FARTHER SOUTH WITH
THIS...AND THE CANADIAN IS SOMEWHERE IN BETWEEN. 06Z GFS STILL HAS 6
TO 8 INCHES OF LIQUID IN THE SIERRA FROM THIS SYSTEM...AND 3 TO 4
INCHES IN THE NORTHERN SAC VALLEY...TO PERHAPS 2 TO 3 INCHES FOR
SACRAMENTO AND STOCKTON. ASSUMING A 10:1 RATIO IN THE MOUNTAINS FROM
THIS `SIERRA CEMENT`...THIS TRANSLATES TO 8 FEET OF SNOW IN 24
HOURS. THE MODELS HAVE BEEN ADVERTISING THESE TYPES OF ACCUMULATIONS
FOR SEVERAL DAYS NOW.

ADDITIONALLY...THIS WILL BE A VERY STRONG WIND EVENT WITH PERHAPS A
15-18MB GRADIENT FROM MFR TO SAC...A CORE OF 70KT WINDS AT H850MB
MOVES INTO THE SACRAMENTO VALLEY
Member Since: 21.05.2006 Posts: 5089 Comments: 114049
228. Cavin Rawlins
1. tammikuuta 2008 klo 15:11 (GMT)
I have updated by blog....

Today's Topic: Air Quality at 2008 Olympics

Viewer Comments: Do you think China should hold the 2008 Olympics and if you was an athlete what would be your concerns?

Wednesday's Blog: California Storm

Member Since: 24.07.2005 Posts: 407 Comments: 19076
227. sydneyaust1
1. tammikuuta 2008 klo 14:29 (GMT)
2007 weather wrap up
Paul Graham, Tuesday January 1, 2008 - 19:50 EDT

2007 was a warm year across most of Australia, according to weatherzone.com.au. The warmest spots were southern NSW, central Victoria, southeast South Australia and inland Western Australia. It was a year of continuing drought for much of the south. The year started with El Nino but finished with La Nina and improving rainfall in eastern states.

Some of the most significant weather was: extreme February heat in Western Australia (Marble Bar had a mean daily maximum of 44.9 degrees); warmest May on record in eastern states; three June east coast lows in NSW, bringing flooding and damaging winds (one beached the cargo ship, the Pasha Bulker); record cold and wet June in the tropics; widespread July snow in Victoria and NSW; flooding rain in late August on the Sunshine Coast (Coops Corner received a phenomenal 772mm 24 hour total); severe hailstorm in western Sydney on December 9th.

- Weatherzone

© Weatherzone 2008
226. hurricane24
1. tammikuuta 2008 klo 14:03 (GMT)
it was fun reading through some of last years posts!
225. Cavin Rawlins
1. tammikuuta 2008 klo 13:49 (GMT)
Storm Over the Eastern Great Lakes

Member Since: 24.07.2005 Posts: 407 Comments: 19076
224. Cavin Rawlins
1. tammikuuta 2008 klo 13:28 (GMT)
Moderate Tropical Storm Elnus (24 hr Rainfall Reports)

13:00 UTC 01 JAN 2007 - Morondava, Madagascar (Toliara) - 24.6 mm
13:00 UTC 01 JAN 2007 - Morombe, Madagascar (Toliara) - 50.1 mm

Reference Map:






Member Since: 24.07.2005 Posts: 407 Comments: 19076
223. Cavin Rawlins
1. tammikuuta 2008 klo 13:23 (GMT)
GM,

Moderate Tropical Storm Elnus

1300 UTC JAN 01 2007

Pattern Type: Sheared 3/4 degrees from center but excellent banding and convection remains.

Current Intensity: CI 2.5/35/997

Adjustments: None

Final Intensity: CI 2.5/35/997

Dvorak Trends:
1530 UTC 31 DEC 2007 - CI 2.5
2230 UTC 31 DEC 2007 - CI 2.7
0030 UTC 01 JAN 2008 - CI 3.0
1300 UTC 01 JAN 2008 - CI 2.5

Member Since: 24.07.2005 Posts: 407 Comments: 19076
222. sydneyaust1
1. tammikuuta 2008 klo 12:01 (GMT)
Happy New Year Shen
221. Thundercloud01221991
1. tammikuuta 2008 klo 11:41 (GMT)
shear tendency is also down by 40 knts just to the SW
Member Since: 1.08.2006 Posts: 28 Comments: 3716
220. Thundercloud01221991
1. tammikuuta 2008 klo 11:38 (GMT)
Also I was just looking at shear analysis and if it can stay north of the 30 knt shear then it will have a bullseye of 5 knt shear then it will increase to 15-20 knts then decrease again also midlevel shear is not too bad there either
Member Since: 1.08.2006 Posts: 28 Comments: 3716
219. Thundercloud01221991
1. tammikuuta 2008 klo 11:33 (GMT)
well lets see what it can do today if it can get convection over the center then it may have a chance
Member Since: 1.08.2006 Posts: 28 Comments: 3716
218. KoritheMan
1. tammikuuta 2008 klo 11:27 (GMT)
Trying, yes, but will it likely succeed? No. Shear is currenty low, but gets very hostile to the southwest.
Member Since: 7.03.2007 Posts: 521 Comments: 19119
217. Thundercloud01221991
1. tammikuuta 2008 klo 11:17 (GMT)
Has anyone seen the fact that 95L is trying to make a comeback
Member Since: 1.08.2006 Posts: 28 Comments: 3716
216. ShenValleyFlyFish
1. tammikuuta 2008 klo 11:03 (GMT)
Happy New Year to all:
Shen
Member Since: 9.09.2007 Posts: 36 Comments: 4687
215. petet
1. tammikuuta 2008 klo 10:38 (GMT)
hey
i had a lot links for south-west indian ocean for satellite images,current weather etc but i lost them (cuz my computre blocked) so
if someone knows something,can send it to me,please?(on mail or here)

thanks a lot

Happy New Year 2008
All the best for everyone
214. sydneyaust1
1. tammikuuta 2008 klo 09:26 (GMT)
92S


=========================
IDW23200
40:3:1:24:13S107E999:11:00
SECURITE

HIGH SEAS WEATHER WARNING FOR METAREA 10 ISSUED BY THE
AUSTRALIAN BUREAU OF METEOROLOGY TROPICAL CYCLONE WARNING
CENTRE PERTH AT 0715UTC 1 JANUARY 2008

GALE WARNING FOR THE WESTERN AREA

Please be aware, wind gusts can be a further 40 percent stronger than the
averages given here, and maximum waves may be up to twice the height.

SITUATION
At 0600 UTC a Tropical Low was located within 25 nautical miles of
latitude twelve decimal eight south [12.8S]
longitude one hundred and six decimal seven east [106.7E]
Recent movement : east southeast at 14 knots
Central pressure: 994 hPa


AREA AFFECTED
Within 120 nautical miles in northern quadrants


FORECAST
W/NW winds 25/35 knots rough to very rough seas moderate swell within 120
nautical miles in northern quadrants. Winds easing below 34 knots by 0000UTC 2
January.

Forecast positions
At 1800 UTC 01 January: Within 35 nautical miles of 13.7 south 109.9 east
Central pressure 996 hPa.

At 0600 UTC 02 January: Within 65 nautical miles of 14.7 south 112.6 east
Central pressure 998 hPa.

REMARKS
All ships in the area please send weather reports every three hours.
Regular weather observing ships use normal channels.
Other ships please use either email to tcwcwa@bom.gov.au or fax to +61892632261
or satellite to SAC 1241 through Land Earth Station Perth 312.


Next warning will be issued by 1300 UTC 01 January 2008.


WEATHER PERTH

==========================
213. neutrino006
1. tammikuuta 2008 klo 07:27 (GMT)
HAPPY NEW YEAR!!!
212. HadesGodWyvern (Mod)
1. tammikuuta 2008 klo 07:22 (GMT)
TROPICAL LOW 05U ADVISORY NUMBER SIX - issued at 6:00 AM UTC
==========================================

At 6:00 AM UTC, Tropical Low [994 hPa] located near 12.8S 106.7E had 10 minute sustained winds of 25 knots with gusts up to 35 knots. The cyclone is moving east-southeast at 14 knots.

AREA AFFECTED
Within 120 nautical miles in northern quadrants

FORECAST
West-Northwest winds 25/35 knots rough to very rough seas moderate swell within 120 nautical miles in northern quadrants. Winds easing below Gale-Force Winds by 0000UTC 02January.
Member Since: 24.05.2006 Posts: 48 Comments: 43649
211. HadesGodWyvern (Mod)
1. tammikuuta 2008 klo 07:16 (GMT)
TROPICAL CYCLONE MELANIE ADVISORY NUMBER TWENTY-ONE - Issued at 6:00 AM UTC
===============================================

At 6:00 AM UTC, Tropical Cyclone Melanie [986 hPa] located near 19.9S 110.6E had 10 minute sustained winds of 40 knots with gusts up to 55 knots. The cyclone is moving south-southwest at 5 knots.

AREA AFFECTED
Within 100 nautical miles of the centre in southwest quadrant decreasing to 40 nautical miles in northeast quadrant.

FORECAST
Maximum winds to 40 knots near the centre decreasing to 30 knots by 0000 UTC 02January.

Gale Force Winds within 100 nautical miles of the centre in southwest quadrant decreasing to 40 nautical miles in northeast quadrant with rough to very rough seas and moderate swell. Winds easing below 34 knots by 0000 UTC 02January.

Forecast and Intensity
========================
24 HRS: 21.6S 108.5E 30 knots [Tropical Low]
Member Since: 24.05.2006 Posts: 48 Comments: 43649
210. NorthxCakalaky
1. tammikuuta 2008 klo 07:01 (GMT)
.
209. listenerVT
1. tammikuuta 2008 klo 06:46 (GMT)
kellnerp (201.)

VERY COOL! :~)
Great start to an exciting year...
with Mother Nature adding the punctuation!
Member Since: 11.07.2007 Posts: 0 Comments: 5402
208. listenerVT
1. tammikuuta 2008 klo 06:43 (GMT)
H A P P Y * N E W * Y E A R * 2 0 0 8 * !

........o


.......o
........o
...|******|
...|******|
...\******/
.....\.***/
.......{ }
........||
........||
........||
......~~~

~ *clink!* ~
Member Since: 11.07.2007 Posts: 0 Comments: 5402
207. HadesGodWyvern (Mod)
1. tammikuuta 2008 klo 06:31 (GMT)
TROPICAL CYCLONE ELNUS ADVISORY NUMBER SEVEN - ISSUED AT 6:00 AM UTC
=============================================

At 6:00 AM UTC, Moderate Tropical Storm Elnus [994 hPa] located near 18.9S 40.9E or 1515 kms west of the coast of Reunion had 10 minute sustained winds of 35 knots with gusts up to 50 knots. The storm is reported as quasi-stationary.

Dvorak Intensity: T2.5

Gale-Force Winds 35 knots within 20 NM from the center extending up to 70 NM from the center in the southeastern quadrant.

Near Gale force winds within 30 NM from the center extending up to 90 NM in the southwestern and northeastern quadrants and up to 130 NM in the southeastern quadrant.

Forecast and Intensity
======================
12 HRS: 19.6S 40.7E 50 knots (Forte Tempête Tropical)
24 HRS: 20.5S 40.4E 60 knots (Forte Tempête Tropical)

Additional Information
========================
Moderate Tropical Storm Elnus remains quasi-stationary within the last 6 hours. The system is expected tracking progressively south-southwestward then southward towards a weak in the subtropical high pressures belt and regulary intensify thanks to a very favorable environment (Warm Sea Surface Temperatures of 29-30C, Good Low Level Inflows, and Upper Level Outflows). Stronger winds extend further in the southeast of the system due to the gradient with the subtropical high pressures.

Best Wishes and Happy New Year 2008
Member Since: 24.05.2006 Posts: 48 Comments: 43649
206. NorthxCakalaky
1. tammikuuta 2008 klo 06:31 (GMT)
Happy 2008. hopefully a quite hurricane season.
205. NorthxCakalaky
1. tammikuuta 2008 klo 06:26 (GMT)
This snow might close school on Thursday! :)
204. NorthxCakalaky
1. tammikuuta 2008 klo 06:22 (GMT)
... Winter Storm Watch remains in effect from Tuesday afternoon
through Wednesday afternoon...

Snow showers and snow squalls will develop Tuesday afternoon and
continue into Wednesday afternoon. Total snowfall accumulations
are expected to exceed 6 inches across higher elevations in the
western portions of Ashe... Watauga... and Grayson County. In
addition... gusty northwest winds will likely create areas of
blowing snow as well as very cold wind chills by Wednesday
morning.

A Winter Storm Watch means there is a potential for significant
snow accumulations that may impact travel. Continue to monitor
the latest forecasts.


203. BtnTx
1. tammikuuta 2008 klo 06:10 (GMT)
Happy New Year to All in the WU Blog Family !!!
Member Since: 12.10.2001 Posts: 20 Comments: 888
202. 1900hurricane
1. tammikuuta 2008 klo 06:04 (GMT)
Happy New Year Y'all!!! It's offically new year now, because it's 2008 in Centeral Time!!!
Member Since: 2.08.2006 Posts: 45 Comments: 11556
201. kellnerp
1. tammikuuta 2008 klo 05:48 (GMT)
Nothing like lighting in a heavy snow storm just as the Ball drops in Times Square. (South Bend, Indiana)

Member Since: 1.09.2003 Posts: 0 Comments: 172
200. HadesGodWyvern (Mod)
1. tammikuuta 2008 klo 05:45 (GMT)


2008 "Year of the Rat" ^_^ though it begins February 4th
Member Since: 24.05.2006 Posts: 48 Comments: 43649
199. BahaHurican
1. tammikuuta 2008 klo 05:43 (GMT)
And here is a definition from the AMS glossary:

--------------------------------------------------------------------------------

blizzard—A severe weather condition characterized by high winds and reduced visibilities due to falling or blowing snow.
The U.S. National Weather Service specifies a wind of 30 knots (35 miles per hour) or greater, sufficient snow in the air to reduce visibility to less than 400 m (0.25 miles). Earlier definitions also included a condition of low temperatures, on the order of −7°C (20°F) or lower, or −12°C (10°F) or lower (severe blizzard). The name originated in the United States but it is also used in other countries. In the Antarctic the name is given to violent autumnal winds off the ice cap. In southeastern France, the cold north wind with snow is termed blizzard (see also boulbie). Similar storms in Russian Asia are the buran and purga. In popular usage in the United States and in England, the term is often used for any heavy snowstorm accompanied by strong winds.

Member Since: 25.10.2005 Posts: 19 Comments: 20686
197. 1900hurricane
1. tammikuuta 2008 klo 05:31 (GMT)
193. HurricaneKing 11:07 PM CST on December 31, 2007
Happy New Year!!!!!!


Not quite yet!!!
Member Since: 2.08.2006 Posts: 45 Comments: 11556
196. BahaHurican
1. tammikuuta 2008 klo 05:30 (GMT)
Also a wiki definition:

[edit] Definition
Because the factors involved with the classification of winter storms are complex, there are many different definitions of the word blizzard. A major consensus is that in order to be classified as a blizzard, as opposed to merely a winter storm, the weather must meet several conditions: There must be falling or blowing snow, strong winds, and cold or falling temperatures. What the measurements must amount to for a blizzard to be classified as such depends on where you are. It is also a severe storm, that goes up to 30 mph of wind speed, and the temperature drops below freezing.


[edit] Canada
According to Environment Canada, a winter storm must have winds of 40 km/h (25 mph) or more, have snow or blowing snow, visibility less than 1 km (about 5⁄8 mile), a wind chill of less than −25 °C (−13 °F), and that all of these conditions must last for 4 hours or more before the storm can be properly called a blizzard.


[edit] United Kingdom
Other countries, such as the UK, have a lower threshold: the Met Office defines a blizzard as "moderate or heavy snow" combined with a mean wind speed of 48 km/h (30 mph) and visibility below 200 m (650 ft). When all of these conditions persist after snow has stopped falling, meteorologists refer to the storm as a ground blizzard.


[edit] United States
In the United States, the National Weather Service defines a blizzard as sustained 35 mph (56 km/h) winds which leads to blowing snow and causes visibilities of ¼ mile or less, lasting for at least 3 hours. Temperature is not taken into consideration when issuing a blizzard warning, but the nature of these storms are such that cold air is often present when the other criteria are met. [2]

Member Since: 25.10.2005 Posts: 19 Comments: 20686
195. BahaHurican
1. tammikuuta 2008 klo 05:28 (GMT)
A blizzard is a severe winter storm condition characterized by low temperatures, strong winds, and heavy blowing snow. Blizzards are formed when a high pressure system, also known as a ridge, interacts with a low pressure system; this results in the advection of air from the high pressure zone into the low pressure area. The term blizzard is sometimes misused by news media to describe a large winter storm that does not actually satisfy official blizzard criteria.

According to Wikipedia
Member Since: 25.10.2005 Posts: 19 Comments: 20686
194. NorthxCakalaky
1. tammikuuta 2008 klo 05:10 (GMT)
What is the criteria for a blizzard?
193. HurricaneKing
1. tammikuuta 2008 klo 05:07 (GMT)
Happy New Year!!!!!!
Member Since: 6.07.2005 Posts: 71 Comments: 2449
192. NorthxCakalaky
1. tammikuuta 2008 klo 05:01 (GMT)
lol, mets here changing their forcast from snow showers to a winter storm warning for many counties in western N.C.

Half a foot of snow!
191. Cavin Rawlins
1. tammikuuta 2008 klo 05:00 (GMT)
Happy 2008 to Central America, Cuba, the Bahamas and US and Canada East Coast.
Member Since: 24.07.2005 Posts: 407 Comments: 19076
190. Cavin Rawlins
1. tammikuuta 2008 klo 04:54 (GMT)
.
Member Since: 24.07.2005 Posts: 407 Comments: 19076
189. HurricaneKing
1. tammikuuta 2008 klo 04:15 (GMT)
45 minutes till 2008 for me.
Member Since: 6.07.2005 Posts: 71 Comments: 2449
188. JLPR
1. tammikuuta 2008 klo 04:14 (GMT)
Happy 2008!!! =P 12 mins late lol
Member Since: 4.09.2007 Posts: 36 Comments: 5223
187. BahaHurican
1. tammikuuta 2008 klo 04:08 (GMT)
Back atcha, 456.

We still have about 52 minutes to go . . . LOL

Member Since: 25.10.2005 Posts: 19 Comments: 20686
186. Cavin Rawlins
1. tammikuuta 2008 klo 04:07 (GMT)
Moderate Tropical Storm Elnus

0330 UTC JAN 01 2008

Pattern Type: Curve banding continues to grow. It now arces to about 0.60 arc.

Current Intensity: CI 3.0/45/991

Adjustments: None

Final Intensity: CI 3.0/45/991

Dvorak Trends:
1530 UTC 31 DEC 2007 - CI 2.5
2230 UTC 31 DEC 2007 - CI 2.7
0030 UTC 01 JAN 2008 - CI 3.0

Member Since: 24.07.2005 Posts: 407 Comments: 19076
185. Cavin Rawlins
1. tammikuuta 2008 klo 04:01 (GMT)
Happy New Year! 2008 is here.
Member Since: 24.07.2005 Posts: 407 Comments: 19076
184. Cavin Rawlins
1. tammikuuta 2008 klo 03:42 (GMT)
17 mins till 2008
Member Since: 24.07.2005 Posts: 407 Comments: 19076
183. JLPR
1. tammikuuta 2008 klo 03:34 (GMT)
...
Member Since: 4.09.2007 Posts: 36 Comments: 5223
182. JLPR
1. tammikuuta 2008 klo 03:33 (GMT)
27min till 2008 =P
Member Since: 4.09.2007 Posts: 36 Comments: 5223
181. Cavin Rawlins
1. tammikuuta 2008 klo 03:23 (GMT)
Cancun 1-7 of January 2008

High pressure will be the dominate feature with easterly flow of 0-10 knots with occasionally 10-15 knots. Chance of showers will be 50% but these will be passing, brief and non-torrential. Relative humidity values 70-90% with 90% and above in the passage of passing showers. Seas will be less that 5 ft during 1-5 Jan and gradually increase to 5-7ft from the 7 onwards.

By W456
Member Since: 24.07.2005 Posts: 407 Comments: 19076
180. Cavin Rawlins
1. tammikuuta 2008 klo 03:16 (GMT)
....SYNOPSIS....

GULF OF MEXICO/NORTHWEST ATLANTIC OCEAN WEST OF 50W....

An upper level trough centered over the Eastern Rockies along 95W continues to push eastward accompanied by a surface cold front that stretches from Eastern Texas to the Great Lakes. There little shower activity associated with this feature south of 35N. However, satellite infrared imagery show this cold front is accompanied rather chilly air and surface observations out of Texas supports the finding.

Meanwhile, another frontal boundary goes from the Central Gulf of Mexico at 27N/90W across Florida north of 28N. This front lies within the Jet Entrance Region of an upper ridge over the Caribbean. Moisture along the front is mainly in the form of mid-upper level clouds within 300 nm ahead of the front from the Yucatan Peninsula across Western Cuba and Southern Florida.

Weak surface pressure will keep conditions fair elsewhere across the area.

A cold front goes from Northern Florida along 30N/78W 32N/70W 36N/60W. A 300 nm wide swath of multilayered cloudiness with embedded showers continues from Florida along the front. Patches of shallow clouds continue to be seen rotating in and around a dominant high pressure ridge now centered on a 1029 mb high near 32N/50W. This flow will continue to bring breezy weather and choppy seas to the Atlantic Coasts of Lesser and Greater Antilles...with the exception of Cuba.

CENTRAL AMERICA AND THE CARIBBEAN REGION....

A mid-upper ridge has its axis roughly along 30N/60W 22N/70W 18N/78W. Mid-high level cloudiness and showers are found across Central America and the Caribbean Sea west of 80W and south of 21N. This area is being caused by upper level divergence east of the upper ridge axis. The remainder of the Caribbean basin is under the influence of a substantial amount of mid-upper level dry air supported by our upper ridge. Deep convection thereby remains absent. However, that does not mean no rain. The dry is the mid and upper levels. Patches of surface moisture continue to be advected over the region increase wind and shower activity. They are most prevalent over the Northeast Lesser Antilles, Puerto Rico, Hispaniola and the Caribbean Sea east of 70W.


By W456
Member Since: 24.07.2005 Posts: 407 Comments: 19076

Viewing: 230 - 180

Page: 1 | 2 | 3 | 4 | 5Blog Index

Top of Page

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.

Local Weather

Mostly Cloudy
50 °F
Pilvistä