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National Weather Service Shreveport LA
1046 AM CDT Fri Jul 20 2018

.UPDATE...

Overall, the forecast is on the right track with triple digit
temperatures expected areawide this afternoon with heat index
values expected to approach 110 degrees and exceed that number
across our northern and eastern most zones. 

Taking a look at 15z temperatures, we are running very near those
numbers we saw this time on Thursday. The difference is the hourly
dewpoint temperatures which are running a couple degrees drier in
most locations compared to this time on Thursday. This is likely 
due in part to a slightly more westerly component to the southwest
winds our region is currently experiencing. Looking at our 12z 
sounding, there is a lot of dry air below 10kft in place across 
our region which suggests that we should see more in the way of 
mixing down of these dewpoints as we go through the afternoon, 
even more so than what we saw on Thursday but the narrative 
supports the Excessive Heat Warning even if we miss out a few 
degrees with the afternoon heat index temperatures with sufficient
mixing. For this reason, we will be making no changes with the 
Excessive Heat Warning for the remainder of the afternoon into the
early evening hours. The Heat Advisory will get replaced with the
Excessive Heat Warning at 11am this morning. 

It looks like the ridge is strong enough across our region such
that the convection across East Central Arkansas should stay to
our north and east through the remainder of the day so it does not
appear necessary to add any pop to the forecast across our north
and east. 

Did slow the warming just a bit diurnally in the hourly grids and
adjusted the hourly dewpoints a little lower than our diurnal 
trend indicated but this did not effect maximum temperatures for 
the day. 

Will update hourly products but an updated zone package is not
necessary at this time. 

13

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

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Regional Hourly Observations For LA SALLE County

SWR not available
Current Temperatures, Dewpoint, RH, Wind, Surface 4-Panel
Current Agricultural Weather Conditions in Louisiana
Based on observations at 1000am CDT, Friday July 20, 2018

Across Louisiana...temperatures are near 90 degrees north, near 84 degrees central, and near 87 degrees south. Current sky conditions are fair north, fair central, and partly sunny south. In the north, relative humidity is near 48%, and the dew point is near 68 degrees. In the central part of the state, relative humidity is near 73%, and the dew point is near 74 degrees. In the south, relative humidity is near 79%, and the dew point is near 80 degrees. The heat index is near 103 degrees south. The livestock heat stress category is danger north, danger central, and danger south. Winds are coming from the southwest at 10 mph in the north, where conditions are favorable for spraying. Winds are coming from the west at 7 mph in the central, where conditions are favorable for spraying. Winds are coming from the northwest at 8 mph in the south, where conditions are favorable for spraying. Based on current available observations, the highest temperature is 90 degrees at Shreveport and DTN Shreveport. The lowest temperature is 84 degrees at Fort Polk and Aexandria Intl.


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 LA SALLE County, LA

1057 AM CDT Fri Jul 20 2018

 DAY ONE  Today and Tonight  

Dangerously hot temperatures with heat index values reaching or 
exceeding 110 degrees are expected areawide today. An Excessive 
Heat Warning is in effect as a result, and precautions should be 
taken to avoid heat-related illnesses. As much as possible, limit
outdoor activities to the early morning or early evening. Drink 
plenty of cool water, take frequent breaks in the shade, and 
exercise caution while out in the sun for even short periods of 
time. Wear lightweight, loose-fit, and light-colored clothing. 
Remember to check on those most susceptible to heat-related 
illness including the elderly, young children, and pets by making 
sure adequate air conditioning is available.

 DAYS TWO THROUGH SEVEN  Saturday through Thursday  

Very hot temperatures in excess of 100 degrees, with heat index 
values at or above 110 degrees are expected to continue through 
this upcoming weekend. Therefore, the Excessive Heat Warning is 
likely to be extended through Sunday. Heat-related headlines may 
even extend into early next week before a gradual decrease in 
temperatures is expected by mid to late week as the upper level 
ridge retrogrades westward away from our region. Chances for 
thunderstorms will be increasing slightly during the mid to late 
week timeframe as well, which may further aid in easing the 
prolonged heat wave.

 SPOTTER INFORMATION STATEMENT  

Activation of emergency management personnel, amateur radio 
operators, and storm spotters will not be needed through tonight.

NWS Severe Weather Map , Convective Outlook


7-Day Forecast For LA SALLE Parish, LA
335 AM CDT Fri Jul 20 2018


HEAT ADVISORY IN EFFECT UNTIL 11 AM CDT THIS MORNING


EXCESSIVE HEAT WARNING IN EFFECT FROM 11 AM THIS MORNING TO 8 PM CDT THIS EVENING

TODAY
Mostly sunny. Highs in the upper 90s. Southwest winds 10 mph. Heat index readings 111 to 114.

TONIGHT
Clear. Lows in the upper 70s. Southwest winds 5 to 10 mph. Heat index readings 106 to 109.

SATURDAY
Mostly sunny. Highs around 101. Southwest winds 10 to 15 mph. Heat index readings around 110.

SATURDAY NIGHT
Mostly clear. Lows in the upper 70s. Southwest winds 5 to 10 mph.

SUNDAY
Mostly sunny. Highs in the upper 90s. West winds 5 to 10 mph.

SUNDAY NIGHT
Mostly clear. Lows in the mid 70s.

MONDAY
Partly cloudy. Highs in the upper 90s.

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

TUESDAY
Mostly sunny. Highs in the mid 90s.

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

WEDNESDAY
Partly cloudy with a 20 percent chance of showers and thunderstorms. Highs in the mid 90s.

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

THURSDAY
Mostly cloudy with a 30 percent chance of showers and thunderstorms. Highs in the mid 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


LA SALLE 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 25-29 JUL 27-AUG 2    JUL       JUL-SEP                      
                 -----------  -----------  --------  ---------
   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

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