yoda Posted February 21, 2011 Share Posted February 21, 2011 Winter Storm Warning going in effect NOW URGENT - WINTER WEATHER MESSAGE NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 511 PM EST MON FEB 21 2011 MDZ003>007-501-502-WVZ051-220615- /O.EXT.KLWX.WS.W.0004.110221T2211Z-110222T1200Z/ WASHINGTON-FREDERICK MD-CARROLL-NORTHERN BALTIMORE-HARFORD- EXTREME WESTERN ALLEGANY-CENTRAL AND EASTERN ALLEGANY-MORGAN- INCLUDING THE CITIES OF...HAGERSTOWN...FREDERICK...WESTMINSTER... FROSTBURG...CUMBERLAND 511 PM EST MON FEB 21 2011 ...WINTER STORM WARNING NOW IN EFFECT UNTIL 7 AM EST TUESDAY... THE WINTER STORM WARNING IS NOW IN EFFECT UNTIL 7 AM EST TUESDAY. * PRECIPITATION TYPE...FREEZING RAIN...SLEET AND SNOW. SNOW MAY BE HEAVY AT TIMES OVERNIGHT. * ACCUMULATIONS...5 TO 8 INCHES OF SNOW AND SLEET...TRACE AMOUNTS OF ICE. * TIMING...FREEZING RAIN WILL CHANGE TO SLEET LATE THIS AFTERNOON... THEN TO SNOW THIS EVENING. THE SNOW WILL CONTINUE THROUGH EARLY MORNING...BECOMING HEAVIEST BETWEEN MIDNIGHT AND 4 AM. * TEMPERATURES...TEMPERATURES IN THE UPPER 20S AND LOWER 30S THIS EVENING... DROPPING TO THE MID 20S BY TUESDAY MORNING. Link to comment Share on other sites More sharing options...
yoda Posted February 21, 2011 Share Posted February 21, 2011 URGENT - WINTER WEATHER MESSAGE NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 511 PM EST MON FEB 21 2011 MDZ009>011-014-VAZ031-042-220615- /O.CON.KLWX.WS.W.0004.110222T0200Z-110222T1200Z/ MONTGOMERY-HOWARD-SOUTHERN BALTIMORE-ANNE ARUNDEL-CLARKE-LOUDOUN- INCLUDING THE CITIES OF...GAITHERSBURG...COLUMBIA...BALTIMORE... ANNAPOLIS...LEESBURG 511 PM EST MON FEB 21 2011 ...WINTER STORM WARNING REMAINS IN EFFECT FROM 9 PM THIS EVENING TO 7 AM EST TUESDAY... A WINTER STORM WARNING REMAINS IN EFFECT FROM 9 PM THIS EVENING TO 7 AM EST TUESDAY. * PRECIPITATION TYPE...SLEET AND SNOW AROUND MIDNIGHT...WHICH WILL BE HEAVY AT TIMES OVERNIGHT. * ACCUMULATIONS...4 TO 7 INCHES OF SNOW. WITHIN THIS RANGE...THE HIGHER AMOUNTS WILL BE IN THE NORTHERN PART OF THESE COUNTIES. * TIMING...RAIN AND SLEET WILL BEGIN LATE THIS AFTERNOON...THEN WILL CHANGE OVER TO SNOW LATE THIS EVENING. THE SNOW WILL CONTINUE UNTIL DAWN. THE HEAVIEST SNOWFALL IS EXPECTED BETWEEN MIDNIGHT AND 5 AM. * TEMPERATURES...TEMPERATURES IN THE MIDDLE 30S THIS EVENING... DROPPING TO THE UPPER 20S BY TUESDAY MORNING. Link to comment Share on other sites More sharing options...
Ian Posted February 21, 2011 Share Posted February 21, 2011 Link to comment Share on other sites More sharing options...
Kmlwx Posted February 21, 2011 Share Posted February 21, 2011 Yoda is back to his old job! NWSBot Link to comment Share on other sites More sharing options...
Ellinwood Posted February 21, 2011 Share Posted February 21, 2011 Westminster METAR reporting light snow... it has jumped the border! KDMW 212216Z AUTO 01005KT 5SM -SN OVC038 00/M03 A2983 RMK AO2 TSNO KDMW 212155Z AUTO 02007KT 10SM -SN SCT018 OVC038 00/M03 A2984 RMK AO2 TSNO Link to comment Share on other sites More sharing options...
mappy Posted February 21, 2011 Share Posted February 21, 2011 sleet/rain the entire way home... not doing much anymore though Link to comment Share on other sites More sharing options...
AfewUniversesBelowNormal Posted February 21, 2011 Share Posted February 21, 2011 Sleet/Light Rain mix 33.5 Based on upper level temps around the area now, NE Maryland should be the first to change over to snow and this may happen shortly. http://www.spc.noaa....f?1298328257386 8" is my guess here. Link to comment Share on other sites More sharing options...
BethesdaWX Posted February 21, 2011 Share Posted February 21, 2011 Temp falling fast, 36.9 with drizzle. Still no sleet. NNE wind blowing between 5-10mph. Link to comment Share on other sites More sharing options...
Solo2 Posted February 21, 2011 Share Posted February 21, 2011 31.8 with a mix bag of precip. Link to comment Share on other sites More sharing options...
TradeWinds Posted February 21, 2011 Share Posted February 21, 2011 32.4F & DP 27.1F in my backyard (Frederick, MD) Link to comment Share on other sites More sharing options...
Ellinwood Posted February 21, 2011 Share Posted February 21, 2011 In other news, what the hell is going on with Gaithersburg's METAR? KGAI hasn't made a wind shift to the north yet, though temps and dewpoints are dropping on par with the surrounding area. Something's amiss. Link to comment Share on other sites More sharing options...
clueless Posted February 21, 2011 Share Posted February 21, 2011 Since there has been a reporting of the changeover...it is officially time for a SNOWHATTAN!!! YAY. Link to comment Share on other sites More sharing options...
pythium Posted February 21, 2011 Share Posted February 21, 2011 Yes Chuck you r right up here in Colora NW Cecil County started as snow pellets all light snow now covering on everything 32.5 degrees Link to comment Share on other sites More sharing options...
TUweathermanDD Posted February 21, 2011 Share Posted February 21, 2011 MESOSCALE DISCUSSION 0118 NWS STORM PREDICTION CENTER NORMAN OK 0458 PM CST MON FEB 21 2011 AREAS AFFECTED...SRN PA/MD CONCERNING...HEAVY SNOW VALID 212258Z - 220300Z ONGOING MODERATE TO HEAVY SNOWFALL IN PORTIONS OF SWRN/S CNTRL PA WILL CONTINUE TO EPISODICALLY PRODUCE INCH AN HOUR RATES WHILE SPREADING EWD INTO SERN PA/MD. COLD ADVECTION AND WET BULB COOLING EFFECTS ARE LEADING TO PLUMMETING SURFACE TEMPERATURES ACROSS THE MCD AREA...WITH THE SURFACE COLD FRONT NOW ANALYZED WELL SOUTH NEAR THE VA/NC BORDER...ARCING NWWD THEN WWD TO A SURFACE LOW NEAR THE KY/IND/OH BORDER. MODERATE TO HEAVY SNOW IS ALREADY BEING REPORTED ON THE LEADING EDGE OF GREATER MOISTURE IN S CNTRL PA AT JOHNSTOWN AND ALTOONA. AREA VAD WIND PROFILE DATA REFLECTS NEAR 40 KTS WLY FLOW AT 4000 FT...OR AROUND 800 MB...WHICH IS LIKELY LEADING TO A FASTER TRANSITION TO MODERATE TO HEAVY SNOW THAN 18Z DETERMINISTIC GUIDANCE WOULD SUGGEST AS GREATER MOISTURE OVER THE OHIO VALLEY TRANSITIONS EWD. UPPER ASCENT WILL INCREASE AS A LOW OVER ME/NEW BRUNSWICK DRIFTS EWD...AND A SEPARATE LOW APPROACHES FROM THE W...MAXIMIZING VERTICAL MOTION IN FAVORABLE MID/UPPER JET ENTRANCE/EXIT REGIONS. CURRENT ANALYSIS SHOWS MAXIMIZED 850 MB CONVERGENCE OVER SRN PA...SHIFTING SLIGHTLY SEWD INTO SERN PA/MD OVER THE NEXT FEW HOURS. EXPECT HEAVIEST SNOW TO DEVELOP EWD ACCORDINGLY...WHILE PERIODS OF HEAVY SNOW CONTINUE ACROSS WRN PORTIONS OF THE MCD AREA AS WELL. ..HURLBUT.. 02/21/2011 ATTN...WFO...PHI...CTP...LWX...PBZ... LAT...LON 40908011 40827753 39997606 39267602 39187699 39787935 40308043 40908011 Link to comment Share on other sites More sharing options...
BethesdaWX Posted February 21, 2011 Share Posted February 21, 2011 36 degrees now, still no sign of sleet/graupel. Link to comment Share on other sites More sharing options...
Mrs.J Posted February 21, 2011 Share Posted February 21, 2011 32.1 on my weather station, as of now no precip. Link to comment Share on other sites More sharing options...
AfewUniversesBelowNormal Posted February 21, 2011 Share Posted February 21, 2011 Over to all snow 31.8 Link to comment Share on other sites More sharing options...
stormtracker Posted February 21, 2011 Share Posted February 21, 2011 Temps dropping like a rock around the area. Already down in the upper 20;'s in HGR. Link to comment Share on other sites More sharing options...
Bob Chill Posted February 21, 2011 Share Posted February 21, 2011 You can clearly see the SLP on radar just over or south of Indianapolis. Low is going to track across WV and to the south of DC. We should get into some really nice rates as the low crosses WV and then to the S of DC. There should be some pretty dry fluffy snow to end the storm and the surface should be down to the mid 20's by that time. Heck, I'm staying up for it. This one is worth it. Link to comment Share on other sites More sharing options...
DustinF Posted February 21, 2011 Share Posted February 21, 2011 34.2 Here in Centreville Temps have dropped two degrees in the last hour. Link to comment Share on other sites More sharing options...
MDScot Posted February 21, 2011 Share Posted February 21, 2011 I am guilty of radar watching, but I am concerned that the main moisture seems to be staying north of me ( Gaithersburg). Any cause for concern? I know it is early - but if there is a good explanation as to why the moisture will move south over time, I would love to hear it. Thanks. Link to comment Share on other sites More sharing options...
Kmlwx Posted February 21, 2011 Share Posted February 21, 2011 I am guilty of radar watching, but I am concerned that the main moisture seems to be staying north of me ( Gaithersburg). Any cause for concern? I know it is early - but if there is a good explanation as to why the moisture will move south over time, I would love to hear it. Thanks. Has been discussed a bit earlier. Precip doesn't always stay on a straight line. Also more precip an develop as the low comes towards us. Link to comment Share on other sites More sharing options...
Ellinwood Posted February 21, 2011 Share Posted February 21, 2011 DCA reporting a rain/snow mix... game on. Link to comment Share on other sites More sharing options...
yoda Posted February 21, 2011 Share Posted February 21, 2011 DCA reporting a rain/snow mix... game on. Wait, come again? Isnt that early? Link to comment Share on other sites More sharing options...
boboz Posted February 21, 2011 Share Posted February 21, 2011 Intermittent sleet here in Centreville MD (E-Shore); sticking to vehicles; 35 degrees F. Link to comment Share on other sites More sharing options...
Ellinwood Posted February 21, 2011 Share Posted February 21, 2011 Wait, come again? Isnt that early? KDCA 212319Z 02013G20KT 3SM -RASN SCT020 BKN039 OVC070 04/01 A2983 RMK AO2 SFC VIS 5 P0001 KDCA 212300Z 36015KT 3SM -RASN BKN022 OVC035 04/01 A2983 RMK AO2 SFC VIS 5 P0000 KDCA 212252Z 02013G19KT 6SM -RASN SCT022 OVC035 04/01 A2983 RMK AO2 RAB2155E21B42SNB51 SLP099 P0000 T00440011 KDCA 212152Z 02014KT 7SM OVC035 05/01 A2981 RMK AO2 RAE15 SLP092 P0000 T00500006 KDCA 212052Z 01015KT 7SM -RA OVC033 05/01 A2979 RMK AO2 RAB38 SLP087 P0000 60000 T00500011 53018 Take it to the bank Link to comment Share on other sites More sharing options...
BlizzardNole Posted February 21, 2011 Share Posted February 21, 2011 I am guilty of radar watching, but I am concerned that the main moisture seems to be staying north of me ( Gaithersburg). Any cause for concern? I know it is early - but if there is a good explanation as to why the moisture will move south over time, I would love to hear it. Thanks. Post #164 above should make you feel better - has the map showing heavy snow area to shift more SEward with time Link to comment Share on other sites More sharing options...
WVclimo Posted February 21, 2011 Share Posted February 21, 2011 Sleet picking up now. Temp is 29.6 degrees. Link to comment Share on other sites More sharing options...
BethesdaWX Posted February 21, 2011 Share Posted February 21, 2011 DCA reporting a rain/snow mix... game on. whaaaa? Its plain drizzle here. Am I the only one who still has drizzle? Link to comment Share on other sites More sharing options...
Bob Chill Posted February 21, 2011 Share Posted February 21, 2011 I am guilty of radar watching, but I am concerned that the main moisture seems to be staying north of me ( Gaithersburg). Any cause for concern? I know it is early - but if there is a good explanation as to why the moisture will move south over time, I would love to hear it. Thanks. I'll put you at ease. Look at the NWS Great Lakes Sector loop. Draw a line from Indianapolis to just south of Fredericksburg VA. Move the entire precip shield along that line and you will see that we have zero to worry about. That is the track of the LP and we will get into the goods for sure. Link to comment Share on other sites More sharing options...
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