weekly weather briefing 12/29/2011 srh.noaa/shv/briefing
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Weekly Weather Briefing 12/29/2011 www.srh.noaa.gov/shv/briefing. Keith Stellman Warning Coordination Meteorologist. National Weather Service Shreveport, Louisiana. Overview. Today Fog through the AM will burn off this afternoon Sunny – temps in the low-mid 60s Weekend - PowerPoint PPT PresentationTRANSCRIPT
Weekly Weather BriefingWeekly Weather Briefing12/29/201112/29/2011
www.srh.noaa.gov/shv/briefingwww.srh.noaa.gov/shv/briefing
Keith StellmanKeith StellmanWarning Coordination MeteorologistWarning Coordination Meteorologist
National Weather Service Shreveport, LouisianaNational Weather Service Shreveport, Louisiana
Overview TodayToday
Fog through the AM will burn off this afternoonFog through the AM will burn off this afternoon Sunny – temps in the low-mid 60sSunny – temps in the low-mid 60s
WeekendWeekend Pleasant – Sunny temps 60-70, lows 40-50Pleasant – Sunny temps 60-70, lows 40-50
Sunday through early TuesdaySunday through early Tuesday Dry Cold front moves through Sunday Dry Cold front moves through Sunday Arctic High builds in behindArctic High builds in behind Highs fall back into the lower 50sHighs fall back into the lower 50s Lows in the upper 20s – low 30’sLows in the upper 20s – low 30’s
Tuesday will be the coldest AM.Tuesday will be the coldest AM.
National Weather Service Shreveport, LouisianaNational Weather Service Shreveport, Louisiana
Current Weather – Big Current Weather – Big PicturePicture
L
LH
Dry Northwest Flow in the upper levelsDry Northwest Flow in the upper levels
Advection FogAdvection Fog
1:45 AM
3:45 AM5:45 AM
8:00 AM
9:15 AM
Strong Strong Low Level Low Level InversionInversionFog will Fog will
stick stick around around through through the AMthe AM
Advection FogAdvection Fog
Fog VisibilitiesFog Visibilities SHV - SHV -
1/16 1/16 TYR - ¼ TYR - ¼ GGG - ½GGG - ½ LFK – ¼LFK – ¼ OCH - OCH -
<1/4<1/4 JSO - JSO -
<1/4<1/4 ELD – ELD –
1/41/4
Pattern on SaturdayPattern on Saturday
Surface high Surface high shifts south shifts south east.east.
Southerly flow Southerly flow returnsreturns
Next upper Next upper system system approachesapproaches
L
Pattern on SundayPattern on Sunday
Arctic Front Arctic Front moves throughmoves through
North/northeast North/northeast windswinds
Colder air works Colder air works inin
Front likely dry Front likely dry with only a with only a slight chance of slight chance of a showera shower
LH
Pattern on MondayPattern on Monday
Arctic High Arctic High moves in moves in overheadoverhead
Calm winds Calm winds Monday nightMonday night
Allows for Allows for maximized maximized radiational radiational cooling cooling
L
H
Cold Cold Tuesday Tuesday
AMAM Arctic High Arctic High
pressure builds pressure builds in.in.
Radiational Radiational coolingcooling
Temperatures Temperatures potentially potentially coldercolder
Pattern from Mon. Pattern from Mon. through Wed.through Wed.
More La Nina More La Nina like pattern like pattern setting upsetting up
Dry northwest Dry northwest flowflow
Slightly below Slightly below normal tempsnormal temps H
Rainfall for DecemberRainfall for December 1st above normal 1st above normal
month this year (for month this year (for most areas)most areas) SHV - SHV - 7.88” 7.88”
(+3.50)(+3.50) MLU – 8.87” (+4.06)MLU – 8.87” (+4.06) TXK – 5.68” (+1.00)TXK – 5.68” (+1.00) ELD – 9.38” (+4.68)ELD – 9.38” (+4.68) TYR – 5.73” (+1.89)TYR – 5.73” (+1.89) GGG – 6.26” (+2.13)GGG – 6.26” (+2.13) DEQ – 3.83” (-0.01)DEQ – 3.83” (-0.01)
Light Blue – 150-200% of Light Blue – 150-200% of normalnormal
Dark Blue 200-300% of Dark Blue 200-300% of normalnormal
Ongoing DroughtOngoing Drought
Some Some lowering in lowering in
LALA
Deep East Deep East TX still TX still D3/D4D3/D4
Rainfall needed to end Rainfall needed to end droughtdrought
over next 6 monthsover next 6 months Normal rainfall Normal rainfall from from December – December – May May
26.98” (SHV)26.98” (SHV) 23.17” (TYR)23.17” (TYR)
Area needs Area needs 30” – 35”30” – 35”
125% -150% of 125% -150% of normalnormal