Weather

Hurricane Lee Graphics

Weather - Hurricane Harvey - 11 hours 29 min ago

5-Day Uncertainty Track last updated Mon, 25 Sep 2017 09:03:40 GMT


Wind Speed Probabilities last updated Mon, 25 Sep 2017 09:22:09 GMT

Summary for Hurricane Lee (AT4/AL142017)

Weather - Hurricane Harvey - 11 hours 39 min ago
...LEE STATIONARY OVER THE CENTRAL ATLANTIC... As of 5:00 AM AST Mon Sep 25 the center of Lee was located near 31.1, -49.4 with movement Stationary. The minimum central pressure was 980 mb with maximum sustained winds of about 90 mph.

Hurricane Lee Public Advisory Number 29

Weather - Hurricane Harvey - 11 hours 39 min ago
...LEE STATIONARY OVER THE CENTRAL ATLANTIC...
Location: 31.1°N 49.4°W
Max sustained: 90 mph
Moving: Stationary
Min pressure: 980 mb

Issued at 500 AM AST Mon Sep 25 2017

Hurricane Lee Information by ATCF XML Prototype

Weather - Hurricane Harvey - 11 hours 40 min ago
Issued at Mon, 25 Sep 2017 08:52:55 GMT. This is only a prototype and the file format may change without notice.

SPC Day 2 Fire Weather Outlook

Weather - Fire Weather - 12 hours 32 min ago
SPC Day 2 Fire Weather Outlook
Day 2 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0300 AM CDT Mon Sep 25 2017 Valid 261200Z - 271200Z ...Synopsis... The persistent upper-level trough over the western CONUS will begin to break down during this forecast period, with a cutoff upper-level low forming in the vicinity of the lower CO River Valley. Modestly enhanced northerly mid- to upper-level flow of 35-45 kt is forecast to continue over much of CA. Surface high pressure will remain present over portions of the Pacific Northwest and Great Basin regions along with warm/dry conditions. ...Portions of the Sacramento Valley and Adjacent Coastal Ranges of Northern CA... Elevated fire weather conditions are likely once again Tuesday afternoon across portions of the Sacramento Valley and adjacent Coastal Ranges of northern CA. Diurnal heating and vertical mixing should promote an increase in northerly surface wind speeds approaching 15 mph along with RH values decreasing into the 10-20% range, supporting an elevated designation across this region. ...Portions of Southern CA... Elevated fire weather conditions will be likely across portions of southern CA, particularly Tuesday morning, with elevated conditions possible again early Wednesday morning. The surface pressure gradient is forecast to be maximized during these periods, bringing sustained offshore surface winds around 15-20 mph across the area, with stronger gusts possible in higher elevations. Locally critical fire weather conditions appear possible for a brief period Tuesday morning, given the combination of strong winds, lowered RH values around 10-15%, and dry fuels. However, these conditions are not expected to occur for more than 3 continuous hours, and therefore no critical area has been introduced. ..Karstens/Gleason.. 09/25/2017 ...Please see www.spc.noaa.gov/fire for graphic product... Read more
Categories: Weather

SPC Day 2 Fire Weather Outlook

Weather - Fire Weather - 12 hours 32 min ago
SPC Day 2 Fire Weather Outlook
Day 2 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0300 AM CDT Mon Sep 25 2017 Valid 261200Z - 271200Z ...Synopsis... The persistent upper-level trough over the western CONUS will begin to break down during this forecast period, with a cutoff upper-level low forming in the vicinity of the lower CO River Valley. Modestly enhanced northerly mid- to upper-level flow of 35-45 kt is forecast to continue over much of CA. Surface high pressure will remain present over portions of the Pacific Northwest and Great Basin regions along with warm/dry conditions. ...Portions of the Sacramento Valley and Adjacent Coastal Ranges of Northern CA... Elevated fire weather conditions are likely once again Tuesday afternoon across portions of the Sacramento Valley and adjacent Coastal Ranges of northern CA. Diurnal heating and vertical mixing should promote an increase in northerly surface wind speeds approaching 15 mph along with RH values decreasing into the 10-20% range, supporting an elevated designation across this region. ...Portions of Southern CA... Elevated fire weather conditions will be likely across portions of southern CA, particularly Tuesday morning, with elevated conditions possible again early Wednesday morning. The surface pressure gradient is forecast to be maximized during these periods, bringing sustained offshore surface winds around 15-20 mph across the area, with stronger gusts possible in higher elevations. Locally critical fire weather conditions appear possible for a brief period Tuesday morning, given the combination of strong winds, lowered RH values around 10-15%, and dry fuels. However, these conditions are not expected to occur for more than 3 continuous hours, and therefore no critical area has been introduced. ..Karstens/Gleason.. 09/25/2017 ...Please see www.spc.noaa.gov/fire for graphic product... Read more
Categories: Weather

SPC Day 1 Fire Weather Outlook

Weather - Fire Weather - 13 hours 36 min ago
SPC Day 1 Fire Weather Outlook
Day 1 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0155 AM CDT Mon Sep 25 2017 Valid 251200Z - 261200Z ...Synopsis... The persistent upper trough/low centered over the Great Basin will begin to lift northeastward into the northern Plains and adjacent Canadian provinces throughout the period. Northerly mid-level winds of 35 to 45 kt are forecast over much of CA along the western periphery of the upper trough. At the surface, high pressure will remain anchored over the Great Basin and northern/central Rockies through the period, which will support a weak to locally moderate offshore wind event across portions of southern CA. ...Portions of the Sacramento Valley and Adjacent Coastal Ranges of Northern CA... Enhanced mid-level winds, combined with diurnal heating, should allow for modest northerly surface winds to mix to the surface this afternoon across portions of the Sacramento Valley and adjacent Coastal Ranges of northern CA. Sustained winds up to 15 mph appear possible, with stronger gusts occurring at higher elevations. RH values will once again decrease into the 10-20% range given an antecedent dry low-level airmass and diurnal heating. These forecast meteorological conditions combined with continued dry fuels support an elevated designation across this region. ...Portions of Southern CA... Elevated fire weather conditions are ongoing early this morning and will develop again Tuesday morning across portions of southern CA when the surface pressure gradient will be maximized. During these periods, offshore winds will increase to 15-20 mph, with stronger gusts possible in higher elevations. RH values will likely remain low through much of the period owing to downslope warming/drying effects, and overnight RH recovery is forecast to remain poor. 06Z surface observations support these forecast trends, particularly at high elevations where winds are gusting to 25-30 mph and RH lowering to near 20% in a few locations. The continuation of drying fuels across this region supports the elevated area. The lack of an even stronger forecast surface pressure gradient and related winds continues to preclude a critical designation. ..Karstens/Gleason.. 09/25/2017 ...Please see www.spc.noaa.gov/fire for graphic product... Read more
Categories: Weather

NHC Atlantic Tropical Weather Discussion

NWS Weather - 15 hours 8 min ago

000
AXNT20 KNHC 250524
TWDAT

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
124 AM EDT Mon Sep 25 2017

Tropical Weather Discussion for North America, Central America
Gulf of Mexico, Caribbean Sea, northern sections of South
America, and Atlantic Ocean to the African coast from the
Equator to 32N. The following information is based on satellite
imagery, weather observations, radar and meteorological analysis.

Based on 0000 UTC surface analysis and satellite imagery through
0515 UTC.

...SPECIAL FEATURES...

Hurricane Maria is centered near 30.0N 73.0W at 25/0300 UTC or
about 335 nm south-southeast of Cape Hatteras North Carolina,
moving north at 7 kt. Minimum central pressure is 950 mb. Maximum
sustained winds are 80 kt with gusts to 100 kt. Scattered
moderate convection is within 135 nm of the center. See the latest
NHC Forecast/Advisory under AWIPS/WMO headers MIATCMAT5/WTNT25
KNHC for more details.

Hurricane Lee is centered near 31.1N 49.5W at 25/0300 UTC or
about 782 nm east of Bermuda moving east-southeast at 3 kt.
Estimated minimum central pressure is 980 mb. Maximum sustained
winds are 80 kt with gusts to 100 kt. Scattered moderate
convection is within 90 nm of the center. See the latest NHC
Forecast/Advisory under AWIPS/WMO headers MIATCMAT4/WTNT24 KNHC
for more details.

...TROPICAL WAVES...

A tropical wave extends its axis from 20N29W to 08N31W, moving
west at around 10 kt. The wave is supported by 700 mb troughing
and weak 850 mb vorticity north of 14N in the vicinity of the
wave axis. Little convection is associated with the wave axis at
this time.

A tropical wave extends its axis from 14N62W to 08N63W, moving
west at 10-15 kt. The wave is on the southwestern periphery of a
700 mb ridge and the western periphery of an upper-level trough
axis extending from 22N54W deep into the tropics to near 04N56W.
Scattered moderate convection from 07N-12N between 55W-62W is
likely associated with the upper-level trough already in place.

...ITCZ/MONSOON TROUGH...

The monsoon trough extends from the African coast near 15N17W to
09N36W. The Intertropical Convergence Zone extends from 09N36W to
08N56W. Scattered moderate convection is from 08N-15N between
16W-27W.

...DISCUSSION...

GULF OF MEXICO...

A mid to upper-level low is noted on water vapor imagery over
southern Alabama, extending a trough axis across the central Gulf
to the northern Yucatan peninsula. A very weak pressure pattern
exists across the entire basin, resulting in gentle to moderate
easterly winds and areas of isolated showers under the influence
of the mid-level lifting dynamics in place. Little change is
expected in overall conditions. By Tuesday night into
Wednesday, easterly flow will increase slightly into moderate to
occasional fresh conditions as ridging noses in from the lower
Mississippi River valley region into the eastern Gulf waters.

CARIBBEAN SEA...

A tropical wave is over the Lesser Antilles. Refer to the section
above for details. Southwest flow aloft prevails west of 75W, and
a weak pressure pattern remains in place across the central and
western Caribbean. Scatterometer data depicts light to gentle
winds across the western half of the basin while moderate to fresh
winds prevail east of 75W. A surface trough was analyzed from
16N75W to 11N74W and continues to be the focus for scattered
showers between 70W-80W.

...HISPANIOLA...

A surface trough southwest of the island enhanced showers across
southern portions of the island. The trough will slide further
westward through the next 24 hours as weak ridging builds in from
the central Atlantic.

ATLANTIC OCEAN...

A tropical wave is moving across the basin. Refer to the section
above for details. Outside the influence of Maria in the west
Atlantic and Lee in the central Atlantic, surface ridging prevails
across much of the remainder of the region. A 1022 mb high is
centered east- northeast from Bermuda near 36N58W and a 1023 mb
high is centered across the east Atlantic near 33N23W.

For additional information please visit
http://www.hurricanes.gov/marine

$$

ERA

Categories: Weather

Hurricane Lee Graphics

Weather - Hurricane Harvey - Sun, 09/24/2017 - 21:39

5-Day Uncertainty Track last updated Mon, 25 Sep 2017 02:39:13 GMT


Wind Speed Probabilities last updated Mon, 25 Sep 2017 03:23:19 GMT

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