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St. Helena Parish, LA Weather and Climate Synopsis

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National Weather Service Shreveport LA
632 PM CDT Fri Jul 20 2018

.AVIATION...
VFR conditions will continue through the 21/00Z TAF period. Areas
of thin cirrus will diminish this evening, but increase late
tonight from the NNW from sct convection that develops over SE
KS/NE OK/Nrn and Cntrl AR around the stout Srn Plains/Lower MS
Valley upper ridge. Some AC cigs will be possible as well over
portions of SW AR/N LA near and just prior to 12Z Saturday, before
these AC and cirrus cigs eventually scatter out by midday and
into the afternoon. S winds 5-8kts tonight will become WSW around
10kts after 15Z Saturday, near and ahead of a weak sfc front that
will sink S into extreme NE TX to along the AR/LA border by mid to late
afternoon. /15/

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

Click here for UKAWC Point Agricultural, Lawn & Garden Forecast/Outlook in case of corrupt tables.

Regional Hourly Observations For ST. HELENA County

SWR not available
Current Temperatures, Dewpoint, RH, Wind, Surface 4-Panel
Current Agricultural Weather Conditions in Louisiana
Based on observations at 700pm CDT, Friday July 20, 2018

Across Louisiana...temperatures are near 92 degrees south. Current sky condition is fair south. In the south, relative humidity is near 63%, and the dew point is near 78 degrees. The heat index is near 107 degrees south. The livestock heat stress category is unavailable north, unavailable central, and emergency south. Winds are unavailable north. Winds are unavailable central. Winds are coming from the southwest at 6 mph in the south, where conditions are favorable for spraying. Based on current available observations, the highest temperature is 92 degrees at New Orleans Lakefront and N.O. INTL ARPT. The lowest temperature is 91 degrees at Slidell and 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. HELENA County, LA

425 PM CDT Fri Jul 20 2018

 DAY ONE  Rest of this afternoon and tonight

Heat index readings of 105 to 110 degrees are expected across the
region for the rest of this afternoon. A heat advisory is in 
effect for all of southern Mississippi and all of southeast 
Louisiana excluding the immediate coast through tonight. 

Isolated thunderstorms will be possible for areas mainly to the 
east of I-55 this afternoon and early evening. Some of the storms 
could turn strong and produce frequent lightning strikes, gusty 
winds in excess of 30 mph, and locally heavy rainfall of 1 to 2 
inches that could lead to ponding of water on low lying and poorly
drained roads. 

 DAYS TWO THROUGH SEVEN  Saturday through Thursday

Heat index readings may approach 110 degrees Saturday through
Monday during the afternoon hours. Heat Advisories have been
issued for all of southern Mississippi and all of southeast
Louisiana excluding the immediate coast Saturday and Sunday. 

Scattered thunderstorms will return to the area Tuesday through
Thursday. A few of these storms could turn strong and produce
frequent lightning strikes, gusty winds in excess of 30 mph, and
locally heavy downpours that could lead to ponding of water on
low lying and poorly drained roads. 

 SPOTTER INFORMATION STATEMENT  

Spotter activation is not anticipated.

NWS Severe Weather Map , Convective Outlook


7-Day Forecast For ST. HELENA Parish, LA
344 PM CDT Fri Jul 20 2018


HEAT ADVISORY IN EFFECT UNTIL 8 PM CDT SUNDAY

TONIGHT
Mostly clear. Lows in the upper 70s. Southwest winds to 5 mph.

SATURDAY
Partly cloudy. Highs in the mid 90s. West winds to 10 mph. Heat index readings around 110 in the afternoon.

SATURDAY NIGHT
Partly cloudy. Lows in the mid 70s. Southwest winds 5 to 10 mph.

SUNDAY
Partly cloudy in the morning then becoming sunny. Highs in the upper 90s. West winds 5 to 10 mph. Heat index readings around 110 in the afternoon.

SUNDAY NIGHT
Partly cloudy. Lows in the mid 70s. West winds to 5 mph in the evening becoming light and variable.

MONDAY
Partly cloudy. Highs in the mid 90s.

MONDAY NIGHT
Mostly clear. Lows in the lower 70s.

TUESDAY
Sunny with a 20 percent chance of showers and thunderstorms in the morning, then partly cloudy in the afternoon. Highs in the lower 90s.

TUESDAY NIGHT
Partly cloudy. Lows in the lower 70s.

WEDNESDAY
Partly cloudy with a 30 percent chance of showers and thunderstorms. Highs in the lower 90s.

WEDNESDAY NIGHT
Partly cloudy with a 20 percent chance of showers and thunderstorms. Lows in the lower 70s.

THURSDAY
Partly cloudy with a 50 percent chance of showers and thunderstorms. Highs in the lower 90s.

THURSDAY NIGHT
Partly cloudy with a 20 percent chance of showers and thunderstorms. Lows in the lower 70s.

FRIDAY
Mostly cloudy with a 50 percent chance of showers and thunderstorms. Highs in the lower 90s.

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. HELENA 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

                            LOUISIANA                                                                     
                 ---------------------------------------------
                 6 TO 10 DAY  8 TO 14 DAY   30 DAY    90 DAY 
                   JUL 26-30 JUL 28-AUG 3    JUL       JUL-SEP                      
                 -----------  -----------  --------  ---------
   Temperature:      Above        Above      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

Friday July 20, 2018 the 201th Day of Year

---------------------------------------------------
SUN
Declination 20.470000
Distance 0.999716 AU
Rise 07:17 EDT Set 21:12 EDT
Transit Meridian 14:14 EDT
Civil Twilight Begins 06:50 EDT Ends 21:38 EDT

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

////////////////////////
JULY 20TH...HISTORIC WEATHER EVENTS
...1930...
The temperature at Washington D.C. soared to an all-time record of 106
degrees. The next day Millsboro reached 110 degrees to set a record for the
state of Delaware. July 1930 was one of the hottest and driest summers in
the U.S., particularly in the Missouri Valley where severe drought
conditions developed. Toward the end of the month state records were set
for Kentucky with 114 degrees, and Mississippi with 115 degrees. (David
Ludlum)
...1934...
The temperature at Keokuk IA soared to 118 degrees to establish a state
record. (The Weather Channel)
...1953...
Twenty-two inches of hail reportedly fell northeast of Dickinson ND. (The
Weather Channel)
...1986...
The temperature at Charleston SC hit 104 degrees for the second day in a
row to tie their all-time record high. (The Weather Channel)
...1987...
Thunderstorms produced severe weather across Minnesota, Wisconsin and
Michigan. Thunderstorms produced wind gusts to 87 mph at Mosinee WI, and
strong thunderstorm winds capsized twenty-six boats on Grand Traverse Bay
drowning two women. Thunderstorms produced nine inches of rain at Shakopee
MN, with 7.83 inches reported in six hours at Chaska MN. Thunderstorms in
north central Nebraska produced hail as large as golf balls in southwestern
Cherry County, which accumulated to a depth of 12 inches. (The National
Weather Summary) (Storm Data)
...1988...
The temperature at Redding CA soared to an all-time record high of 118
degrees. Showers and thunderstorms produced much needed rains from New
England to southern Texas. Salem IN was deluged with 7.2 inches of rain
resulting in flash flooding. (The National Weather Summary)
...1989...
Showers and thunderstorms in the Middle Atlantic Coast Region soaked
Wilmington DE with 2.28 inches of rain, pushing their total for the period
May through July past the previous record of 22.43 inches. Heavy rain over
that three month period virtually wiped out a 16.82 inch deficit which had
been building since drought conditions began in 1985. Thunderstorms in
central Indiana deluged Lebanon with 6.50 inches of rain in twelve hours,
and thunderstorms over Florida produced wind gusts to 84 mph at Flagler
Beach. (The National Weather Summary) (Storm Data)

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