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St. Tammany Parish, LA Weather and Climate Synopsis

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7 Day Forecast Medium & Long Range Outlook Almanac Historical Facts

US Weekly Rainfall Departure

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A joint service of the UK Ag Weather Center and the National Weather Service.

National Weather Service Shreveport LA
452 AM CST Sun Dec 17 2017

One to two inches of needed rainfall occurred across the area last
night, with rainfall quickly exiting the area to the east by mid
morning. A very wet ground and easterly winds underneath a stg low
lvl inversion may result in a rather foggy morning for the Monday
am commute, with cloud cover being a possible limiting factor.  
Another strong and fast movg upper low will pull the frontal 
boundary responsible for this rain, back out of the gulf as a warm
front on Monday. Pcpn water values this time around will greatly 
exceed that with the system last night and very heavy rainfall 
possible where this front will stall out on Tuesday, most likely 
near or just north of the I-20 corridor. Expect some embedded
thunder as well with this widespread rainfall near and south of
this front. After a break in rainfall Wednesday into Thursday, a
strong upper low with plenty of cold air in its wake will come
barrelling towards the area. Instability will become unseasonally
high with LI values in the negative across southern portions of
area and deep convection possible Thu night into Friday. Models
seem a little more progressive and thus tapering off pops into the
early weekend from the nw, which will ease concerns about possible
winter wx for any of the cwa prior to Christmas Holiday. Although
a trailing short wave with mid lvl moisture could produce very lgt
amounts of winter pcpn, mainly north of I-30, feel that chances
and possible impacts not significant to place mention that far out
in extended period attm./07/

National Ag. Weather Outlook, International Ag. Weather Summary
Current Surface Map, [2nd Source TWC]

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Hourly Observations For ST. TAMMANY Parish
500 AM CST SUN DEC 17 2017

N.O. INTL ARPT CLOUDY    68  67  96 SE15      30.05F                  
N.O. LAKEFRONT CLOUDY    66  64  93 SE15      30.07F                  
N.O. DOWNTOWN* CLOUDY    65  63  93 VRB3      30.08F                  
RESERVE*       CLOUDY    68  64  88 S9        30.03F                  
SLIDELL        CLOUDY    67  62  84 S10G22    30.07F                  
BATON ROUGE    LGT RAIN  62  61  96 E6        30.01F                  
BOOTHVILLE     CLOUDY    70  66  87 SE12      30.09R                  
BELLE CHASSE   CLOUDY    63  63 100 SE3       30.07F                  
BOGALUSA*      CLOUDY    63  58  84 MISG      30.07F HAZE             
GALLIANO*      CLOUDY    67  64  88 S6        30.07S                  
NEW ROADS*     HVY RAIN  60  60  97 E9        29.99F                  
GONZALES*      CLOUDY    67  64  91 SE8G17    29.99F                  
HAMMOND*       CLOUDY    61  59  94 S7        30.05S                  
HOUMA*         DRIZZLE   67  66  97 SE12      30.04F                  
PORT FOURCHON* CLOUDY    70  68  94 SE10      30.07R                  

Current Temperatures, Dewpoint, RH, Wind, Surface 4-Panel

Current Agricultural Weather Conditions in Louisiana
Based on observations at 500am CST, Sunday December 17, 2017

Across Louisiana...temperatures are near 68 degrees south. Current sky condition is cloudy south. In the south, relative humidity is near 96%, and the dew point is near 67 degrees. Winds are unavailable north. Winds are unavailable central. Winds are coming from the southeast at 15 mph in the south, where conditions are not favorable for spraying due to strong winds. The livestock cold stress index is in the unavailable category north, unavailable category central, and no stress category south. Based on current available observations, the highest temperature is 68 degrees at N.O. INTL ARPT. The lowest temperature is 62 degrees at Baton Rouge.

Current NOWCAST not available:
Nowcasts are not issued routinely during fair weather. Only when
precipitation or other significant weather is occuring in this Parish will these
forecasts be issued. Currently, there is no short term forecast in effect.

All NWS Radars (In near-real time), Current Livestock Heat Stress Index (LSI), Current Wind Chill Map
Hazardous Weather Outlook For ST. TAMMANY County, LA

440 AM CST Sun Dec 17 2017

 DAY ONE  Today and Tonight

A Small Craft Advisory is in effect this morning for most of the 
open Gulf coastal waters. 

A marginal risk of severe weather is forecast today for areas
mainly south of I-10 in Southeast Louisiana. Although severe is
not expected there is a small risk for one or two storms to
exhibit rotation which could drop a quick tornado or two however
this threat is very low. 

Light to moderate rain is expected with a few briefs moments of 
heavy rain which could lead to ponding of water in low lying and 
poorly draining areas. 

 DAYS TWO THROUGH SEVEN  Monday through Saturday

Showers and embedded thunderstorms will be possible Monday 
through Wednesday. An extended period of persistent light to 
moderate rainfall from Monday through Early Wednesday may result 
in a few inches of rain accumulation over the three day period. 
This may result in localized ponding of water and even flash 
flooding in low lying or poorly drained areas at times. 

Although not currently outlooked for severe weather there could 
be a few strong storms associated with the next cold front early 


Spotter activation is not anticipated at this time.

NWS Severe Weather Map , Convective Outlook

7-Day Forecast For ST. TAMMANY Parish, LA
317 AM CST Sun Dec 17 2017

Showers and slight chance of thunderstorms in the morning, then chance of showers and slight chance of thunderstorms in the afternoon. Highs around 70. South winds to 15 mph. Chance of precipitation near 100 percent.

Cloudy. Slight chance of rain showers in the evening, then chance of rain showers and thunderstorms after midnight. Patchy fog in the evening, then areas of fog after midnight. Lows in the lower 60s. South winds to 5 mph shifting to the northeast after midnight. Chance of precipitation 50 percent.

Cloudy. Rain showers likely in the morning, then chance of rain showers in the afternoon. Highs around 70. Southeast winds to 10 mph. Chance of showers 70 percent.

Mostly cloudy with a 20 percent chance of rain showers. Lows around 60. Southeast winds to 5 mph.

Mostly cloudy with a 30 percent chance of rain showers. Highs in the mid 70s. South winds to 10 mph.

Mostly cloudy. Chance of showers in the evening, then showers likely and slight chance of thunderstorms after midnight. Lows in the lower 60s. Chance of precipitation 60 percent.

Partly cloudy in the morning then clearing. A 50 percent chance of showers. Highs in the lower 70s.

Cooler. Partly cloudy. Lows around 50.

Sunny in the morning then becoming partly cloudy. Highs in the lower 70s.

Partly cloudy in the evening then becoming mostly cloudy. A 20 percent chance of rain showers. Lows in the mid 50s.

Mostly cloudy with a 50 percent chance of rain showers. Highs in the lower 70s.

Mostly cloudy with rain showers likely. Lows in the lower 50s. Chance of showers 70 percent.

Cooler. Partly cloudy with a 40 percent chance of rain showers. Highs in the upper 50s.

12-48 Hr Surface Forecast Maps, TWC 4-Panel Surface Forecast, Fire Danger, Day 1 Precip, Day 2 Precip, Days 1-5 Precip, Severe Weather Pot.-Day 1, Day 2

ST. TAMMANY County, Louisiana Agriculture, Lawn & Garden Weather Advisory

Current Weather Advisory is NOT available

Ag. Weather Forecast Parameter Maps:Spraying Conditions , Dewpoint Temperatures, Livestock Heat Stress

Medium & Long Range Outlook For Louisiana

                 6 TO 10 DAY  8 TO 14 DAY   30 DAY    90 DAY 
                   DEC 22-26    DEC 24-30    DEC       DEC-FEB                      
                 -----------  -----------  --------  ---------
   Temperature:      Below        Below      Above      Above                      
 Precipitation:      Above        Above      Below      Below                      

....  Medium and long range outlooks provided by NCEP/K. Thomas Priddy
5 Day Rainfall Forecast, 6 to 10 Day , 8 to 14 Day , Text, 30-Day Outook, 90-Day Outook, 120-Day Outlook
Almanac Information

Sunday December 17, 2017 the 351th Day of Year

Declination -23.380000
Distance 0.999725 AU
Rise 08:02 EST Set 18:07 EST
Transit Meridian 13:04 EST
Civil Twilight Begins 07:36 EST Ends 18:33 EST

Calculations made for central point in the state.
Time in ET -- and will vary due to location and
elevation -- Priddy

Historical Weather And Climate Facts For Today

A three week blockade of snow began at Portland OR. A record December total
of 34 inches was received. (David Ludlum)
A severe icestorm struck central Illinois. It coated the ground with nearly
two inches of glaze at Springfield. The storm caused 21 million dollars
damage along with much hardship. Ice was on the trees until the 4th of
January, and electricity was not restored until January 10th. (David
An icestorm in western New York State resulted in much damage and hardship.
A Buffalo report stated, "one was kept awake by the breaking limbs, which
snapped off with a report much louder than a rifle shot." (17th-18th) (The
Weather Channel)
A storm in the southwestern U.S. brought heavy rain and heavy snow to parts
of California, Nevada, Arizona, Utah and New Mexico. Charleston NV was
blanketed with 12 inches of snow. Lake Havasu City AZ was drenched with
2.26 inches of rain. (Storm Data) (The National Weather Summary)
Squalls brought locally heavy snow to the southeastern shores of Lake
Michigan. Totals in Michigan ranged up to 14 inches at Harvey. Totals in
Ohio ranged up to 16 inches at Chardon. (The National Weather Summary)
(Storm Data)
Twenty-one cities from Kentucky to Pennsylvania reported record low
temperatures for the date, including Columbus OH with a reading of 12
degrees below zero. Heavy snow continued in the Colorado Rockies. Vail
received 65 inches of snow between the 14th and the 18th of December.
Steamboat Springs was buried under 74 inches, and reported a total of 108
inches of snow between the 10th and the 18th of the month. (The National
Weather Summary) (Storm Data)

Ag Weather Center, Department of Biosystems & Agricultural Engineering, University of Kentucky