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December 2013 obs and discussion


Ian

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LWX responded to my clarifying tweet

 

"The highest December 850 mb T recorded (since 1961) from one of our soundings here at Dulles is 20.6 C on 12/11/2002 at 8 PM

 

That was the only other time since 1961 the 850 T was 18-20 C in December at Dulles, according to our data"

 

https://twitter.com/NWS_BaltWash/status/413448002465173504

https://twitter.com/NWS_BaltWash/status/413448336814129152

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Last full day of snowcover here in Clarksburg today, I'd guess. High was 34.9F. Nice December day. Maybe the snowcover will delay the torch starting tomorrow by a day...

attachicon.gifimage.jpg

Nice picture. Yeah it is all but gone in Germantown. My thought is if we are going to lose the snow, then bring on a few warm days and make happen quick...like pulling a band aid.

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LWX responded to my clarifying tweet

 

"The highest December 850 mb T recorded (since 1961) from one of our soundings here at Dulles is 20.6 C on 12/11/2002 at 8 PM

 

That was the only other time since 1961 the 850 T was 18-20 C in December at Dulles, according to our data"

 

https://twitter.com/NWS_BaltWash/status/413448002465173504

https://twitter.com/NWS_BaltWash/status/413448336814129152

 

 

NARR disagrees.00 UCT 12/12/2002 doesn't look crazy warm. Maybe 3C?

 

121200.png

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NARR disagrees.00 UCT 12/12/2002 doesn't look crazy warm. Maybe 3C?

 

121200.png

 

hmm yeah there was freezing rain the morning of the 11th and the high was mid-30s. 

 

2002 analog cancel.  maybe they typed the wrong year. look for a warm dec 11.

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hmm yeah there was freezing rain the morning of the 11th and the high was mid-30s. 

 

2002 analog cancel.  maybe they typed the wrong year. look for a warm dec 11.

 

Top 20 850t IAD/DCA RAOBS for December:

http://www.crh.noaa.gov/images/unr/soo/T850/top50-T850.pdf <-- See page 48.

 

AD/DCA Rank H8temp Year Month Day Hour(Z) WMO

1 20.6 2002 12 12 0 72403
2 16.2 1977 12 1 12 72403
3 15.7 1955 12 24 21 72405
4 15.2 1967 12 19 0 72403
5 15.2 1951 12 9 15 72405
6 15.1 2001 12 14 0 72403
7 15 1982 12 4 12 72403
8 14.8 1998 12 7 12 72403
9 14.5 1994 12 7 12 72403
10 14.5 1956 12 7 9 72405
11 14.4 1992 12 16 12 72403
12 14.1 1951 12 8 3 72405
13 14 1982 12 26 0 72403
14 14 1949 12 22 3 72405
15 13.9 2001 12 6 0 72403
16 13.8 1955 12 4 21 72405
17 13.7 1951 12 7 15 72405
18 13.6 1990 12 30 12 72403
19 13.6 1990 12 30 11 72403
20 13.5 1991 12 13 12 72403
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AD/DCA Rank H8temp Year Month Day Hour(Z) WMO

1 20.6 2002 12 12 0 72403
2 16.2 1977 12 1 12 72403
3 15.7 1955 12 24 21 72405
4 15.2 1967 12 19 0 72403
5 15.2 1951 12 9 15 72405
6 15.1 2001 12 14 0 72403
7 15 1982 12 4 12 72403
8 14.8 1998 12 7 12 72403
9 14.5 1994 12 7 12 72403
10 14.5 1956 12 7 9 72405
11 14.4 1992 12 16 12 72403
12 14.1 1951 12 8 3 72405
13 14 1982 12 26 0 72403
14 14 1949 12 22 3 72405
15 13.9 2001 12 6 0 72403
16 13.8 1955 12 4 21 72405
17 13.7 1951 12 7 15 72405
18 13.6 1990 12 30 12 72403
19 13.6 1990 12 30 11 72403
20 13.5 1991 12 13 12 72403

 

hmm.. still doesn't make sense looking at the map and obs. is that public?

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Except it doesn't match the actual sfc conditions?

It seems it might be the biggest inversion ever. This says the surface was 1004mb (85m ASL) and 0/-1°C and at 122m ASL (1000.0mb) it was 4.8/4.7°C then at 240m ASL (986mb) it was 20.4/20.4°C

 

 254      0     12      DEC    2002
      1  93734  72403  38.98N 77.47W    85   2350
      2   8500    149   1720     79  99999      3
      3           IAD                99999     kt
      9  10040     85      0     -1    330      2
      4  10000    122     48     47    330      4
      5   9860    240    204    204  99999  99999
      6   9787    304  99999  99999    340     17
      6   9444    609  99999  99999    345     12
      5   9340    704    198    198  99999  99999
      4   9250    794    206    206    330     11
      6   9122    914  99999  99999    300     14
      5   8930   1097    218    218  99999  99999
      6   8807   1219  99999  99999    305     23
      4   8500   1531    206    206    305     27
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It seems it might be the biggest inversion ever. This says the surface was 1004mb (85m ASL) and 0/-1°C and at 122m ASL (1000.0mb) it was 4.8/4.7°C then at 240m ASL (986mb) it was 20.4/20.4°C

 

 254      0     12      DEC    2002
      1  93734  72403  38.98N 77.47W    85   2350
      2   8500    149   1720     79  99999      3
      3           IAD                99999     kt
      9  10040     85      0     -1    330      2
      4  10000    122     48     47    330      4
      5   9860    240    204    204  99999  99999
      6   9787    304  99999  99999    340     17
      6   9444    609  99999  99999    345     12
      5   9340    704    198    198  99999  99999
      4   9250    794    206    206    330     11
      6   9122    914  99999  99999    300     14
      5   8930   1097    218    218  99999  99999
      6   8807   1219  99999  99999    305     23
      4   8500   1531    206    206    305     27

If you look at the graph you can actually spot the horizontal blue line at 1000mb on the sounding.  The 9999s (No Data Code)  in there may also be an indication the instrument was having issues. But it does look like it could be 16C off on all the good readings.

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It should.  You might want to let the NWS know.

Yeah, I did.  Gotta love databases. I think most people would be sad to realize how much almost all of them suck. Well, except most people don't care.

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