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The March 5-7 White Lion Obs/Nowcasting Thread


Ji

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Surprised to see the zones issued by LWX at 9:33 still saying 6-10" for Montgomery Co and 4-8" for Calvert where my folks live.  They still have all rain there.  As for here, we just have light snow with occasional moderate bursts and the 1-1.5" is just holding.  It seems event the real intense echoes (yellow) are moderate at best then it goes back to just light.  I have doubts we see even 4" on the grass.  Streets and even sidewalks are just wet.

 

That's my experience in Rockville right now.

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Made it to 10" before we hit a massive lull. Even had sunlight for a time. Probably spells the end of our accumulation window here, and I'm not sure that we even get another substantial band. Really got great rates from 7:30 to about 9. Picked-up 2 inches in that time period. Great storm for March.

It's coming back

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Dude. What are you talking about? Have you even looked at the radar. We still have 8-9 hours of snow left. :facepalm:

It does depend on how far north that band is. We are getting to the point where our radar direction is ne. Those bands have to be a bit to our north in order to clip us.

I think DC is going to be happy when this is done.

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Made it to 10" before we hit a massive lull.  Even had sunlight for a time.  Probably spells the end of our accumulation window here, and I'm not sure that we even get another substantial band.  Really got great rates from 7:30 to about 9.  Picked-up 2 inches in that time period.  Great storm for March.

Wow.  Congrats.  4" here, and with the lull in precip its jumped to 34 degrees. Winds have turned to the NW, so not expecting much more from the bands to the east.

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SATELLITE PRECIPITATION ESTIMATES..DATE/TIME 03/06/13 1445Z
SATELLITE ANALYSIS BRANCH/NESDIS---NPPU---TEL.301-683-1404
LATEST DATA USED: GOES-13 1415Z KUSSELSON
NOAA AMSU:0805Z/0947Z DMSP SSMIS:1108Z/1126Z
.
LOCATION...NEW JERSEY...PENNSYLVANIA...DELAWARE...MARYLAND...
LOCATION...VIRGINIA...NORTH CAROLINA...DISTRICT OF COLUMBIA...WEST
VIRGINIA...
LOCATION...TENNESSEE...KENTUCKY...
.
ATTN WFOS...PHI...AKQ...CTP...LWX...RNK...PBZ...RLX...MRX...JKL...
ATTN RFCS...MARFC...SERFC...OHRFC...LMRFC...
.
EVENT...SNOW EASTERN KY/FAR WESTERN NC INTO THE MID-ATLANTIC...
.
SATELLITE ANALYSIS AND TRENDS...UPPER LOW PLACEMENT AS PER LATEST
GOES WATER VAPOR AND 11Z SATELLITE WINDS WAS OVER S CENTRAL VIRGINIA
NEAR THE NC BORDER AND SHIFTING SLIGHTLY SOUTH OF EAST.  AIR MASS RGB
PRODUCT SUGGESTING PV ANOMALY SWING AROUND THE BOTTOM OF THE LOW NOW AND
COULD KEEP LOW ON ABOUT THE SAME PATH OR EAST REST OF THE MORNING. WITH
UPPER HIGH HOLDING OVER EASTERN QUEBEC AND LITTLE VORT IN THE WESTERN
ATLANTIC NEAR 39N/60W...THIS SHOULD KEEP DEFORMATION ZONE FROM MOVING
ANY FURTHER NORTH THAN CURRENT POSITION ACROSS WESTERN VA TO C MD TO
C PA AND PROBABLY ALLOW FOR MORE OF SHIFT NORTHEAST OR ENE REST OF THE
MORNING INTO AFTERNOON.   OUT EDGE OF ENHANCED COOL CLOUD TOPS MARKING
WESTERN EDGE OF LIGHT SNOW EASTERN KY TO FAR NW NORTH CAROLINA AND NORTH
THROUGH C WEST VA TO WESTERN MD AND INTERIOR SW PA.  MOST COOLING CLOUD
TOPS SHIFTING EAST OUT OF WEST VIRGINIA AND OCCURRING ACROSS W CENTRAL/N
VIRGINIA AND CENTRAL VA INTO
E CENTRAL VA AND CENTRAL MD.    HIGHEST SNOW RATES WITH LONGEST SUSTAINED
COOLING CLOUD TOPS PAST 2HRS SEEN CENTRAL TO N CENTRAL VA INTO THE WEST VA
PANHANDLE...N CENTRAL TO INTERIOR WESTERN MARYLAND INTO S LAUREL HIGHLANDS
OF PA IN AND AROUND JOHNSTOWN AND ALTOONA.    SST ANOMALY INFO FROM MARCH
4 SHOWED AN ABOVE NORMAL OCEAN TEMP OFF NC AND MID-ATLANTIC COAST WHICH
MAY KEEP WARM AIR IN LONGER DELMARVA...SE PA AND S NJ AS UPPER LOW AND
SURFACE LOW CONTINUE TO MIGRATE EAST.    LATEST AND  EASTERNMOST COOLING
CLOUD TOPS S MD INTO THE WESTERN DELMARVA/EASTERN SHORE OF MD ASSOCIATED
WITH LIGHT TO MODERATE RAIN AT THE MOMENT.
.
AN ANNOTATED SATELLITE GRAPHIC SHOWING THE HEAVY PRECIPITATION THREAT AREA
SHOULD BE AVAILABLE ON THE INTERNET ADDRESS LISTED BELOW IN APPROXIMATELY
10-15 MINUTES.
.
SHORT TERM OUTLOOK VALID 1430-1800Z...MEDIUM CONFIDENCE FACTOR IN SHORT
TERM OUTLOOK...UPPER LEVEL FEATURES WILL CONTINUE TO SHIFT ESE THIS
PERIOD...AND THIS WILL SLOWLY TRANSITION RAIN S CENTRAL PA AND S MD TO
SNOW...BUT SUCH WARM AIR EAST AND OCEAN EFFECTS WILL KEEP LIQUID PRECIP
GOING C/S NJ SOUTH TO AT LEAST THE EASTERN DELMARVA THROUGH THE PERIOD.
COLDER AIR APPEARS TO BE TAKING A MORE DIRECT EAST ROUTE ALONG AND SOUTH
OF THE PATH OF THE UPPER LOW WHICH SHOULD PASS NEAR THE SE VA-NC BORDER
AREA THIS PERIOD.  HIGHEST SNOW RATES AS PER LATEST MICROWAVE SNOWFALL
PRODUCT AT 938Z WAS OVER THE LAUREL HIGHLANDS OF BLAIR AND CAMBRIA COUNTY
AT 0.5"-1.0"/HR RATES...THIS WILL TRY TO SHIFT EAST BUT WILL LIKELY
STRUGGLE TO HOLD TOGETHER WITH THESE TYPES OF INTENSITIES AS IT CAN
ENCOUNTER WARM AIR ALOFT COMING IN OFF THE MID ATLANTIC COASTAL OCEAN.
SAME STRUGGLE IS OCCURRING OVER THE DC AND IMMEDIATE SUBURB AREAS AND
WESTERN SHORE OF THE CHESAPEAKE ENVIRONS AND WILL LIKELY HAVE AN EFFECT
ON TEMPERING SNOW AMOUNTS THROUGH 18Z.

 

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Switching back and forth from SNRA to RASN of varying proportions.  Went out with the kids for a little bit, getting away from trees and houses, I believe the spotter reports of 1.5-2"from earlier.  But the snow/slush is so wet, you can't even sled in it.  It is good snow if you want to throw a snowball at someone that could put them in a coma. 

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DP up to 40 per my WX Station just a touch outside White Marsh, MD

 

Interestingly, I've recorded .34" of Liquid, but picked up just under an inch by ~3am. Though a slip-n-slide would be more appropriate than a sled right now.

 

I suspect as that strange piece of energy fades in the atlantic, our low will jog NE slinging both a change of the wind and some heavier precip with it.

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On the doorstep... hoping this is going to be a switch to better than a rasn mix

Screenshot_2013-03-06-09-36-42_zpsfcf306

 

sbox_wx, which app is that? That's the best radar I've seen on Android.

 

34 degrees, heavy snow right now, winds picking up -- went to back to sleep for a couple hours and the ~1.5" we had at 4:30 a.m.-ish compacted to under an inch here, but with current snowfall rate it's re-stacking quickly and sticking to pavement again.

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