美墨交界处Kassandra(NA06-0124) - 登陆格陵兰 - SPC:ENH OPC:SW 60KT 968hPa

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Forecast Discussion
   SPC AC 250055

   Day 1 Convective Outlook  
   NWS Storm Prediction Center Norman OK
   0655 PM CST Tue Jan 24 2023

   Valid 250100Z - 251200Z

   ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF
   SOUTHERN LOUISIANA...MISSISSIPPI...ALABAMA...AND THE WESTERN FLORIDA
   PANHANDLE...

   ...SUMMARY...
   Damaging winds and a few tornadoes still appear likely tonight into
   early Wednesday morning across parts of coastal/southern Louisiana,
   Mississippi, Alabama, and the western Florida Panhandle. A strong
   tornado remains possible as well.

   ...01Z Update...
   An upper trough will pivot northeastward from the southern Plains
   into the lower MS Valley and Mid-South tonight. A related surface
   low centered over LA this evening will likewise develop across MS
   into western TN/KY through the end of the period. Appreciable
   low-level moisture return will remain confined along/south of a warm
   front, which is forecast to advance only slowly northward across
   southern portions of LA/MS/AL into the FL Panhandle.

   Greater surface-based thunderstorm potential should remain along and
   south of the warm front tonight, where surface dewpoints can
   increase into the low to mid 60s. A broken line of thunderstorms is
   ongoing this evening across southern LA. Cells embedded within this
   line have a history of producing tornadoes across the Upper TX Coast
   into southwestern LA earlier today.

   Current expectations are for this activity to continue posing a
   threat for tornadoes this evening across parts of southern LA into
   southern MS, as low-level shear remains very strong per recent
   mesoanalysis estimates and the VWP from KLIX. A strong tornado
   remains a possibility. The main limiting factor continues to be
   marginal instability (reference 00Z LIX sounding), but any
   thunderstorm that can remain surface-based will clearly have the
   potential to rotate and produce a tornado. This tornado threat
   should be maximized with any supercell that can remain semi-discrete
   within or just ahead of the broken line. Otherwise, damaging winds
   will also remain a concern given the strength of the low-level flow.
   See Mesoscale Discussion 99 for more details on the short-term
   severe threat across southern LA.

   A band of convection will eventually spread into southern/coastal AL
   and parts of the FL Panhandle late tonight into early Wednesday
   morning. Short-term guidance remains insistent that sufficient
   low-level moisture will move inland across these areas to support
   weak boundary-layer instability and a continued threat for tornadoes
   and damaging winds overnight, as low-level and deep-layer shear will
   remain quite strong. A strong tornado appears possible with this
   activity as well.

   ..Gleason.. 01/25/2023

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一些实况https://view.inews.qq.com/a/20230125A01ZSE00

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...STORM WARNING...
.06 HOUR FORECAST LOW INLAND NEAR 39N84W 998 MB. FROM 31N TO 36N
W OF 72W AREA OF S WINDS 25 TO 35 KT. SEAS TO 9 FT.
.24 HOUR FORECAST COMPLEX LOW WITH MAIN CENTER INLAND NEAR 44N75W
994 MB AND NEW SECOND CENTER NEAR 44N70W 992 MB. FRONT TO EXTEND
FROM THE SECOND CENTER TO 38N72W TO 31N76W. WITHIN 300 NM E
QUADRANT OF SECOND CENTER AND N OF 33N WITHIN 240 NM E OF THE
FRONT WINDS 35 TO 50 KT. SEAS 10 TO 20 FT. ELSEWHERE W OF A LINE
FROM 49N59W TO 40N57W TO 31N65W WINDS 25 TO 35 KT. SEAS 8 TO 16
FT.
.48 HOUR FORECAST LOW 57N57W 975 MB. WITHIN 420 NM NE QUADRANT
AND WITHIN 420 NE AND E OF A FRONT TO EXTEND FROM THE LOW TO
45N52W WINDS 40 TO 55 KT. SEAS 13 TO 26 FT...HIGHEST NEAR 54N51W.
ELSEWHERE WITHIN 720 NM NE QUADRANT...AND N OF A LINE FROM 42N70W
TO 35N62W TO 50N35W WINDS 25 TO 40  KT. SEAS 8 TO 21 FT.

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https://weather.com/storms/winte ... s-midwest-northeast
Winter Storm Kassandra Spreading Snow From The Midwest To Northeast
At a Glance
A winter storm will spread snow from the Midwest into the Northeast today.
Significant snowfall and gusty winds will hamper travel along the path of the storm.
The storm will wind down on Thursday, but snowfall will linger in northern New England and the Great Lakes.
Winter Storm Kassandra will hamper travel as it spreads snow through portions of the Midwest, Great Lakes and Northeast on Wednesday.

Current Radar, Alerts
Snowfall from Kassandra is impacting areas from the Great Lakes to the Northeast right now.

The storm brought several inches of snow to the Southern Plains and Ozarks on Tuesday.

Tree damage and power outages have been reported in southern Missouri and northern Arkansas after the area picked up to a foot of heavy, wet snow.

Winter storm warnings and winter weather advisories have been issued by the National Weather Service along the current and future path of Kassandra.

Those alerts stretch from the Great Lakes into New England. Expect hazardous travel conditions in some of these areas because of the snowfall.

Here's a look at what's to come from Kassandra

Forecast Timing
Wednesday-Wednesday Night

At least moderate snow and gusty winds will impact the Great Lakes and mid-Mississippi Valley on Wednesday. Travel will be impacted by this combination in Chicago, Cleveland, Detroit, Indianapolis and St. Louis.

In the Northeast, the Interstate 95 corridor from New York City to Boston might see a brief period of snowfall before changing to rain.

The interior Northeast can expect the most snowfall, although some areas on the southern fringe of the wintry weather might eventually change to a wintry mix, even rain.

Wednesday's Forecast
(The green shadings depict where rain is expected. Areas that are shaded blue are expected to see snow. Purple-shaded locations may see either rain or snow. Areas in pink are expected to see sleet or freezing rain (ice). )
Thursday

Kassandra will begin to pull away on Thursday, but snowfall and gusty winds could linger from northern New England into the eastern Great Lakes.

Forecast Snowfall Totals
Additional snow totals in the Midwest and Great Lakes will be 1 to 5 inches. Localized totals of 5 to 8 inches are possible in locations that see the heaviest and most persistent snow.

Farther east, portions of upstate New York and northern New England are likely to pick up 6 inches or more of snowfall.

Snow Forecast

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...STORM WARNING...
.LOW INLAND NEAR 42N82W 996 MB MOVING NE 25 KT. W OF A LINE FROM
31N76W TO 38N71W TO 41N70W AREA OF S WINDS 25 TO 35 KT. SEAS 8
TO 13 FT.
.06 HOUR FORECAST COMPLEX LOW WITH MAIN CENTER INLAND NEAR
43N80W 994 MB AND NEW SECOND LOW NEAR 41N74W 998 MB. FRONT TO
EXTEND FROM THE SECOND LOW TO 33N78W. WITHIN 180 NM E OF THE
FRONT WINDS 35 TO 50 KT. SEAS 10 TO 20 FT.
.24 HOUR FORECAST COMBINED LOW 49N64W 978 MB. FRONT TO EXTEND
FROM THE LOW TO 49N61W TO 45N60W TO 40N64W TO 33N70W. WITHIN 240
NM E OF FRONT N OF 45N WINDS 45 TO 60 KT. SEAS 15 TO 25 FT.
ELSEWHERE WITHIN 240 NM E OF FRONT N OF 37N WINDS 35 TO 50 KT.
SEAS 9 TO 19 FT. ELSEWHERE W OF A LINE FROM 54N50W TO 40N55W TO
34N64W WINDS 25 TO 40 KT. SEAS 8 TO 18 FT.
.48 HOUR FORECAST COMPLEX LOW WITH MAIN LOW 62N54W 970 MB AND
SECOND LOW 61N41W 987 MB. WITHIN 360 NM SW QUADRANT OF MAIN LOW
WINDS 40 TO 55 KT. SEAS 14 TO 25 FT. ELSEWHERE WITHIN 420 NM SW
AND 360 NM SE QUADRANTS OF SECOND LOW WINDS 35 TO 50 KT. SEAS 16
TO 27 FT. ELSEWHERE N OF 45N BETWEEN 35W AND 48W...AND N OF 49N
BETWEEN 48W AND 60W WINDS 25 TO 40 KT. SEAS 8 TO 22 FT.

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...STORM WARNING...
.LOW INLAND NEAR 56N57W 972 MB MOVING NE 20 KT. BETWEEN 180 NM
AND 420 NM NE...180 AND 600 NM E...120 NM AND 660 NM SE AND 180
NM AND 300 NM NE QUADRANTS WINDS 45 TO 60 KT. SEAS 15 TO 32
FT...HIGHEST SE QUADRANT. ELSEWHERE WITHIN 600 NM N...720 NM
NE...SE...SW AND 300 NM NW QUADRANTS INCLUDING THE GULF OF SAINT
LAWRENCE AND WITHIN 240 NM E OF A FRONT FROM 46N52W TO 38N60W
WINDS 30 TO 45 KT. SEAS 10 TO 24 FT. ALSO FROM 40N TO 60N BETWEEN
35W AND 65W AND FROM 56N TO 67N BETWEEN 55W AND 64W WINDS 20 TO
30 KT. SEAS 8 TO 18 FT IN MIXED SWELL.  
.24 HOUR FORECAST LOW 64N50W 980 MB. FROM 57N TO 63N BETWEEN 35W
AND 42W...FROM 57N TO 60N BETWEEN 42W AND 50W...WITHIN 300 NM S
QUADRANT AND WITHIN 180 NM W SEMICIRCLE WINDS 30 TO 45 KT. SEAS
16 TO 28 FT. ELSEWHERE FROM 54N TO 57N BETWEEN 35W AND
53W...WITHIN 480 NM SW...420 NM W AND 300 NM NW QUADRANTS
WINDS20 TO 30 KT. SEAS 10 TO 22 FT IN MIXED SWELL.
.48 HOUR FORECAST LOW AND CONDITIONS WELL N OF THE AREA.

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现在应该是巅峰了

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https://weather.com/storms/winte ... est-northeastWinter
Winter Storm Kassandra Spread Snow Across Southwest, Southern Plains, Midwest And Northeast (RECAP)
Winter Storm Kassandra spread snow from the Southwest into the Southern Plains, Midwest and Northeast Jan. 23-26, 2023.

The storm first brought more than a foot of snow to the higher elevations of northern and central Arizona. Snow was also spotted in the deserts northeast of Phoenix.

In the Southern Plains, snow totals ranged from up to 10 inches in the Texas Panhandle to 1 to 3 inches around the Oklahoma City metro area. Lubbock, Texas, picked up 7.2 inches from the storm on Jan. 24.

Southern Missouri and northern Arkansas were hit hard by heavy, wet snow that contributed to tree damage and power outages Jan. 24-25. Up to 16 inches of snow fell in the Ozarks of northern Arkansas near Mount Magazine State Park.

The storm dusted parts of Illinois, Indiana, Ohio and Michigan with a few inches of snow Jan. 25. Parts of the Detroit metro pick up over a half foot of snow.

Kassandra closed out its journey across the country by bringing snowfall to portions of the interior Northeast and New England Jan. 25-26.

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