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Upper St. Martin Parish, LA Weather and Climate Synopsis

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Weather Summary Hourly Observations Nowcast Agricultural Weather Outlook
7 Day Forecast Medium & Long Range Outlook Almanac Historical Facts

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

National Weather Service Shreveport LA
1002 PM CST Wed Dec 13 2017

Local terrain effects are once again proving to be a major
forecast hurdle with regards to temperatures tonight, especially
across Southeast Oklahoma and Southwest Arkansas. At 03z, the
temperature in Idabel was 50 degrees F, but Broken Bow, De Queen,
and Mt. Herman have already fallen into the mid 30s. The low 
temperature forecast for tonight was lowered by several degrees 
across the northern half of McCurtain County and adjacent portions
of extreme Southwest Arkansas.

Temperatures have also fallen rather quickly at Lufkin despite 
quite a bit of cirrus clouds across Deep East Texas. Forecast 
temperatures were also lowered by a few degrees across our far 
southwest zones in Deep East Texas. However, the combination of 
clouds and dewpoints still in the mid 30s should limit of how much
cooling occurs.

Updated text products have been sent.


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

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Regional Hourly Observations For UPPER ST. MARTIN County

SWR not available
Current Temperatures, Dewpoint, RH, Wind, Surface 4-Panel
Current Agricultural Weather Conditions in Louisiana
Based on observations at 1000pm CST, Wednesday December 13, 2017

Across Louisiana...temperatures are near 50 degrees south. Current sky condition is cloudy south. In the south, relative humidity is near 74%, and the dew point is near 42 degrees. Winds are unavailable north. Winds are unavailable central. Winds are coming from the south at 6 mph in the south, where conditions are favorable for spraying. 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 52 degrees at New Orleans Lakefront. The lowest temperature is 49 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 UPPER ST. MARTIN County, LA

509 AM CST Wed Dec 13 2017

 DAY ONE  Today and Tonight
No Hazardous weather is expected.

 DAYS TWO THROUGH SEVEN  Thursday through Tuesday
A weak cold front will move through the area late Thursday into
early Friday bringing a slight chance of showers with the highest
chance along and south of the I-10 corridor.

A surface low will develop across the western gulf and move
northeast across the area Saturday into early Sunday bringing
numerous showers and thunderstorms. While severe weather is not
anticipated, periods of heavy rainfall could occur during this
time. A cold front will move through the area Sunday afternoon
bringing the precipitation to an end.

Spotter activation is not anticipated.

NWS Severe Weather Map , Convective Outlook

7-Day Forecast For UPPER ST. MARTIN Parish, LA
343 PM CST Wed Dec 13 2017

Mostly clear. Lows in the lower 40s. West winds up to 5 mph.

Mostly sunny. Highs in the mid 60s. West winds up to 5 mph.

Cloudy. A 40 percent chance of showers after midnight. Lows in the lower 40s. North winds up to 10 mph.

Cooler, cloudy. Chance of showers in the morning, then slight chance of showers in the afternoon. Highs in the lower 50s. North winds 5 to 15 mph. Chance of showers 50 percent.

Mostly cloudy in the evening then becoming partly cloudy. Lows in the upper 30s. Northeast winds up to 5 mph.

Partly sunny with slight chance of showers and isolated thunderstorms. Highs in the upper 50s. Chance of precipitation 20 percent.

Warmer. Showers likely and isolated thunderstorms. Lows in the mid 50s. Chance of precipitation 60 percent.

Warmer. Showers likely and isolated thunderstorms. Highs in the lower 70s. Chance of precipitation 60 percent.

Mostly cloudy with chance of showers and isolated thunderstorms. Lows in the mid 50s. Chance of precipitation 40 percent.

Mostly cloudy with chance of showers and isolated thunderstorms. Highs in the mid 60s. Chance of precipitation 30 percent.

Mostly cloudy with chance of showers and isolated thunderstorms. Lows in the upper 40s. Chance of precipitation 40 percent.

Mostly sunny with slight chance of showers and isolated thunderstorms. Highs in the mid 60s. Chance of precipitation 20 percent.

Mostly clear. Lows in the mid 40s.

Sunny. Highs in the mid 60s.

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

UPPER ST. MARTIN 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 19-23    DEC 21-27    DEC       DEC-FEB                      
                 -----------  -----------  --------  ---------
   Temperature:      Above       Normal      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

Wednesday December 13, 2017 the 347th Day of Year

Declination -23.210000
Distance 0.999724 AU
Rise 08:00 EST Set 18:05 EST
Transit Meridian 13:02 EST
Civil Twilight Begins 07:34 EST Ends 18:31 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 heavy snowstorm kicked off the snowiest winter in modern records for
western New England. (The Weather Channel)
Record cold weather gripped the nation. The low temperature in Lexington, KY 
fell to -6 degrees (record low on this date), -3 at Covington and -3 at Paducah. 
Severe cold conditions went as far south as Florida with a hard freeze. Morning 
lows reached 35 degrees at Miami, 18 degrees at Tampa, and 12 degrees at 
Jacksonville. It was the coldest December weather of the 20th century and caused 
millions of dollars damage to crops and foliage. In Georgia, the morning low of 
9 degrees below zero at Blairsville established a state record for the month of 
A major winter storm produced high winds and heavy snow in the Southern
Rockies and the Southern High Plains. Snowfall totals in New Mexico ranged
up to 25 inches at Cedar Crest, with up to three feet of snow reported in
the higher elevations. Winds of 75 mph, with gusts to 124 mph, were
reported northeast of Albuquerque NM. El Paso TX was buried under 22.4
inches of snow, including a single storm record of 16.8 inches in 24 hours.
The snowfall total surpassed their previous record for an entire winter
season of 18.4 inches. Record cold was experienced the next three nights as
readings dipped into the single numbers. High winds ushering unseasonably
cold air into the southwestern U.S. gusted to 100 mph at Grapevine CA. (The
National Weather Summary) (Storm Data)
Low pressure off the Atlantic coast produced up to a foot of snow in
eastern Nassau County and western Suffolk County of southeastern New York
State. Mild weather prevailed across the western half of the country. Nine
cities reported record high temperatures for the date, including Goodland
KS with a reading of 74 degrees. (The National Weather Summary) (Storm
Strong northwesterly winds, ushering bitterly cold arctic air into the
central U.S., produced squalls with heavy snow in the Great Lakes Region.
Snowfall totals in Upper Michigan ranged up to 24 inches at Manistique.
Nine cities in Arkansas and Texas reported record low temperatures for the
date, including Calico Rock AR with a reading of 4 degrees above zero.
(Storm Data) (The National Weather Summary)

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