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Jefferson County, AL Weather and Climate Synopsis

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

US Weekly Rainfall Departure

US Weekly Temperature Departure
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A joint service of the UK Ag Weather Center and the National Weather Service.

Updated for severe weather threats on Friday night and Saturday.

An upper-level trough over the Great Lakes an attendant swath of 
northwesterly 40-60kt 500mb flow will have an unusual impact (for
July) on our forecast area Friday night and Saturday. A synoptic 
cold front located near the Ohio River should be the focus for 
explosive thunderstorm development late Friday afternoon. This 
activity should grow upscale in the presence of SBCAPE values of 
4000-6000 J/kg and move southward into TN during the evening. It 
appears that relatively lower amounts of boundary layer moisture 
will be present over much of Alabama on Friday afternoon due to 
low-level diffluence. This should begin to change during the 
evening as the surface to 850mb wind fields respond to the 
approaching upper-level jet streak. A mesolow associated with the
MCS may also enhance moisture transport especially across West 
Alabama, leading to SBCAPE values of 3000-4000 J/kg as the MCS 
arrives. This amount of instability combined with 500mb flow of 
35-45kt should help maintain an enhanced damaging wind into the 
northwestern part of the CWA, and possibly all the way to our 
southern border through early Saturday morning. The damaging wind 
threat may diminish with eastward extent due to lower CAPE values.

Another round of severe storms is possible on Saturday if the 
airmass recovers. This will depend on the strength and placement 
of the cold pool resulting from the MCS Friday night into Saturday
morning. Models suggest low-level westerly flow will become 
established Saturday afternoon as 50-55kt northwesterly 500mb flow
overspreads this area. This may result in quality moisture 
advection and SBCAPE values of 3500-4500 J/kg. Weak surface 
convergence and boundaries leftover from prior convection could 
serve to spark isolated to scattered supercell thunderstorm 
development Saturday afternoon and evening. In addition to 
damaging winds and quarter size hail, strongly veering surface to 
700mb flow would support some tornado risk as well. The overall 
setup is highly conditional, and forecast confidence is low at 
this time. 


Alabama Forecast Discussion (NWS)
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 JEFFERSON County
300 AM CDT FRI JUL 20 2018
BIRMINGHAM     FAIR      73  69  87 NE5       29.96F                  
MONTGOMERY     FAIR      76  75  97 E9        29.91F                  
SHELBY CO ARPT FAIR      72  69  90 CALM      29.93F                  
MAXWELL AFB    CLOUDY    75  73  93 E7        29.90F                  
GREENVILLE     FAIR      73  69  87 CALM      29.90F FOG              
SELMA          PTSUNNY   73  72  94 CALM      29.90F FOG              
PRATTVILLE     CLOUDY    73  73 100 CALM      29.91F                  
BESSEMER       FAIR      72  70  93 NE3       29.95F                  
TALLADEGA      FAIR      71  71  99 E5        29.96F                  
PELL CITY      SUNNY     72  72 100 CALM      29.95F                  
MARION         PTSUNNY   72  72 100 SW6       29.91F FOG              
SYLACAUGA      FAIR     N/A N/A N/A CALM      29.94F                  

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

Current Agricultural Weather Conditions in Alabama
Based on observations at 300am CDT, Friday July 20, 2018

Across Alabama...temperatures are near 73 degrees north, near 73 degrees central, and near 75 degrees south. Current sky conditions are fair north, fair central, and fair south. In the north, relative humidity is near 93%, and the dew point is near 71 degrees. In the central part of the state, relative humidity is near 87%, and the dew point is near 69 degrees. In the south, relative humidity is near 93%, and the dew point is near 73 degrees. The livestock heat stress category is no stress north, no stress central, and no stress south. Winds are from the southeast at 3 mph north, where conditions are favorable for spraying. Winds are from the northeast at 5 mph central, where conditions are favorable for spraying. Winds are from the west at 5 mph south, where conditions are favorable for spraying. Based on current available observations, the highest temperature is 78 degrees at Brookely Field. The lowest temperature is 71 degrees at Gadsden and Alexander City.

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

U.S. Radar Map, All NWS Radars (In near-real time), Current Livestock Heat Stress Index (LSI), Current Wind Chill Map
Hazardous Weather Outlook For JEFFERSON County, AL

718 PM CDT Thu Jul 19 2018

 DAY ONE  Today and Tonight.

No hazardous weather is expected at this time.

 DAYS TWO THROUGH SEVEN  Friday through Wednesday.

The combination of high temperatures and humidity will push heat 
index values to around 105 degrees on Friday afternoon and again 
Saturday afternoon. This will occur generally west of a line from 
Eufaula to Alabaster to Hamilton.

Severe thunderstorms will be possible across all of Central Alabama
Friday night into early Saturday morning. A line of storms with
damaging winds may enter our northern counties as early as 9 PM
Friday and continue southward through 5 AM Saturday. Currently the 
highest threat area appears to be along and northwest of Interstate 
59, where widespread wind damage is possible. 

Severe storms may develop again on Saturday afternoon and evening
along and southeast of Interstate 59. These storms may be isolated to
scattered in nature and capable of producing damaging winds, quarter
size hail, and perhaps a tornado. Currently, forecast confidence in 
this scenario is low. 


Activation of storm spotters and emergency management may be needed
on Friday night and Saturday.

NWS Severe Weather Map , Convective Outlook

7-Day Forecast For JEFFERSON County, Alabama
330 AM CDT Fri Jul 20 2018

Partly cloudy with a 20 percent chance of thunderstorms. Highs in the lower 90s. Southeast winds around 5 mph.

Mostly cloudy. Thunderstorms likely in the evening, then chance of thunderstorms after midnight. Lows in the lower 70s. South winds around 5 mph. Chance of rain 70 percent.

Partly cloudy with a 40 percent chance of thunderstorms. Highs in the lower 90s. West winds 5 to 10 mph.

Mostly cloudy with chance of thunderstorms in the evening, then partly cloudy with slight chance of thunderstorms after midnight. Lows in the lower 70s. West winds 5 to 10 mph. Chance of rain 30 percent.

Partly cloudy with a 20 percent chance of thunderstorms. Highs around 90. Northwest winds 5 to 10 mph.

Mostly cloudy. Lows in the lower 70s.

Partly cloudy. Slight chance of thunderstorms in the morning, then chance of thunderstorms in the afternoon. Highs in the upper 80s. Chance of rain 50 percent.

Mostly cloudy. Lows around 70.

Partly cloudy with a 40 percent chance of thunderstorms. Highs in the upper 80s.

Mostly cloudy with a 20 percent chance of thunderstorms. Lows in the lower 70s.

Partly cloudy with a 50 percent chance of thunderstorms. Highs around 90.

Mostly cloudy with a 40 percent chance of thunderstorms. Lows in the lower 70s.

Thunderstorms likely. Highs in the upper 80s. Chance of rain 60 percent.

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

Medium & Long Range Outlook For Alabama
                 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     Normal     Normal                      

....  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

Declination 20.470000
Distance 0.999716 AU
Rise 06:53 EDT Set 20:56 EDT
Transit Meridian 13:54 EDT
Civil Twilight Begins 06:26 EDT Ends 21:23 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

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
The temperature at Keokuk IA soared to 118 degrees to establish a state
record. (The Weather Channel)
Twenty-two inches of hail reportedly fell northeast of Dickinson ND. (The
Weather Channel)
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)
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)
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)
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