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Wind Observations

Pacific Northwest Pressure Gradients

TTAA00 KSEW 132215
** SEW GRADIENT TABLE 02/13/12 22Z **                              132215Z

       UIL-  OTH-  PDX-  OLM-  UIL-  HQM-  AST-  BLI-  UKI-  AST-  BLI-  BLI-
DD/HH  BLI   SEA   BLI   BLI   NUW   SEA   UIL   YZT   UIL   SEA   YQQ   YWL 
13/22  -0.1  +0.8   0.0  -0.2  -0.2  +0.2  +0.1  -1.0  -3.9  -0.1  -0.5  -1.0
13/20  -0.4  +0.9  +0.2  +0.1  -0.5   0.0  +0.5  -2.1  -3.0  -0.3  -1.0  -1.7
13/18  -0.7  +1.0  +0.1  -0.3  -0.9   0.0  +0.6  -2.5  -3.4  -0.3  -0.9  -2.9
13/16  -0.5  +0.6  -0.4  -0.3  -0.8  -0.5  +0.2  -3.1  -4.0  -0.7  -0.7  -3.6
13/14  -0.2  +1.0  -0.7  -0.4  -0.4  -0.4  -0.7     M  -2.6  -1.2  -0.8  -2.5
13/12   0.0  +1.3  -0.7  -0.4  -0.1  -0.2  -0.8  -5.1  -1.8  -0.9  -0.8  -2.0
13/10  -0.1  +0.3  -0.8  -0.6   0.0  -0.1  -0.6  -5.3  -0.9  -0.6  -0.9  -0.7
13/08  -0.4  -1.1  -0.4  -0.5  -0.4  -0.3  -0.1  -4.8  +0.1  -0.7  -0.9  -0.5
13/06  -0.5  -1.1  +0.1  -0.5  -0.4  -0.2  +0.2  -4.1  +0.8  -0.6  -0.7  +0.4
13/04  -0.3  -0.7  -0.3  -0.7  -0.1  +0.1   0.0  -3.4  +1.3  -0.5  -0.3  +1.2
13/02  -0.2  -0.4  -0.9  -1.0  +0.1  -0.4  -0.3  -2.7  +1.8  -0.7  +0.4  +2.0
13/00  -0.5  +0.9  -1.0  -1.1  -0.3  -0.7  -0.4  -1.4  +1.8  -1.2  +0.9  +2.6
12/22  -0.8  +0.9  -0.6  -0.8  -0.6  -1.1  -0.1  +0.1  +2.3  -1.6  +1.2  +2.9

       PDX-  UIL-  CLM-  SEA-  SEA-  OLM-  SEA-  YKM-  SHN-  SHN-  SEA-  SMP-
DD/HH  DLS   CLM   NUW   EAT   YKM   YKM   GEG   GEG   SEA   NUW   SMP   EAT 
13/22  +2.9  -0.3  +0.1  +4.1  +3.7  +3.4  +5.0  +1.3     M     M  +2.9  +1.2
13/20  +1.9  -0.5   0.0  +3.5  +2.8  +2.5  +4.9  +2.1     M     M  +3.1  +0.4
13/18  +2.0  -0.7  -0.2  +2.8  +2.7  +2.2  +4.2  +1.5     M     M  +2.7  +0.1
13/16  +1.4  -0.5  -0.3  +2.8  +2.6  +1.9  +3.9  +1.3     M     M  +3.3  -0.5
13/14  +1.4  -0.5  +0.1  +2.8  +3.0  +2.3  +4.0  +1.0     M     M     M     M
13/12  +2.2  -0.4  +0.3  +2.8  +3.1  +2.6  +3.8  +0.7     M     M  +3.3  -0.5
13/10  +2.0  -0.4  +0.4  +2.5  +2.9  +2.4  +3.4  +0.5     M     M  +3.1  -0.6
13/08  +2.0  -0.3  -0.1  +2.4  +2.9  +2.2  +2.9   0.0     M     M  +2.8  -0.4
13/06  +2.3  -0.3  -0.1  +2.1  +2.5  +1.7  +2.6  +0.1     M     M  +2.8  -0.7
13/04  +2.2  -0.1   0.0  +1.8  +2.1  +1.2  +2.0  -0.1     M     M  +2.3  -0.5
13/02  +1.6  +0.1   0.0  +1.5  +1.8  +0.6  +1.6  -0.2     M     M  +2.2  -0.7
13/00  +1.4   0.0  -0.3  +1.7  +2.0  +0.6  +1.4  -0.6     M     M  +2.0  -0.3
12/22  +1.2  -0.3  -0.3  +2.2  +2.3  +0.8  +1.6  -0.7     M     M  +2.5  -0.3

 
 Rules of thumb for estimating wind speed and direction based on local pressure gradients:
  (UIL-BLI) x 10 = Use if gradient is positive. Results in west wind thru the Strait of Juan De Fuca.
  (UIL-BLI) x 5 = Use if gradient is negative. Results in east wind thru the Strait.

  (OTH-SEA)

= South wind at SEA if gradient is positive. North wind if gradient is negative.
  (PDX-BLI) x 5 =

South wind at SEA if gradient positive. North wind if gradient negative.

  (OLM-BLI) x 10

= South wind at SEA if gradient positive. North wind if gradient negative.
  (SEA-EAT) = Westerly component at SEA if gradient positive. Easterly if gradient negative.
  (SEA-GEG) = Westerly component at SEA if gradient positive. Easterly if gradient negative.
  (SEA-SMP) = Westerly component at SEA if gradient positive. Easterly if gradient negative.
 Show Decoded Data Show METAR/TAF 
KSEA   13 Feb 1:53 pm PST
Temperature44°F
Dew Point41°F
Ceiling (×100ft)025
Visibility10sm
Weather-
Altimeter30.03"Hg
Wind180° / 4kt
KSEA  METAR
KSEA 132153Z 18004KT 10SM FEW008 SCT013 OVC025 07/05 A3003 AO2 SLP177 T00670050
KSEA  TAF
KSEA 132104Z 1321/1424 VRB03KT P6SM SCT009 BKN015 OVC030
    TEMPO 1321/1322 BKN009 OVC015
  FM132200 VRB03KT P6SM BKN028 OVC040
  FM140000 VRB03KT P6SM BKN035 BKN050
  FM140300 VRB03KT P6SM SCT050 SCT200
  FM140900 VRB03KT P6SM VCFG FEW022 SCT060 BKN200
  FM141200 VRB03KT P6SM VCFG SCT022 BKN060 OVC130
  FM141800 04006KT P6SM SCT022 OVC050
    PROB30 1418/1424 -RA

SEA TRACON WEATHER IMPACTS
Issued: 2/13/2012 1:50:47 PM  
PUGET SOUND CONVERGENCE ZONE
SITE CONF TIME INFO
BFI      
SEA      
WIND GT 40 KNOTS AOB FL050
SITE CONF TIME INFO
SEA      
THUNDERSTORMS (WITHIN 10 MILES)
SITE CONF TIME INFO
BFI      
SEA      
FOG (VIS < 1 MILE)
SITE CONF TIME INFO
BFI      
SEA      
  

ZSE PIREP REQUIREMENTS
  Issued: 2/13/2012 1:47:20 PM  

AREAS

HAZARDS    A       B       C       D   
 ICING (>=LGT)        
 LO-TURB (>=MOD)        
 HI-TURB (>=MOD)        
 IFR CONDS        
 CIG AOB 050 X X X X
 VIS AOB 5SM        
 TSTMS        
 LLWS        

Click here for ZSE Area Map


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