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Monday, October 5, 2020

Daily Weather Briefing for Monday, October 5, 2020



OUTLOOK

High pressure and quiet weather will prevail through much of this week. Temperatures will at least briefly rebound to above normal mid- week in response to weak ridging overhead. Rain chances may increase next weekend depending on the track of a tropical system.


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News Brief
(no news brief today)



General forecast through Wednesday night


Today

Patchy fogin the morning. Otherwise, partly sunny, then gradually becoming sunny, with highs mostly in the 60s with a few locations in the lower elevations reaching 70 or so. Calm winds.

Tonight

Mostly clear, with lows ranging from the upper 30s in the higher elevations to the mid-to-upper 40s in the lower elevations. Calm winds.

Tuesday

Sunny, with highs ranging from the upper 60s in the higher elevations to the mid-70s in the lower elevations. Calm winds in the morning increasing to come out of the southwest around 5 mph in the afternoon.

Tuesday Night

Mostly clear, with lows in the 40s. Calm winds.

Wednesday

Sunny, with highs ranging from the low 70s in the lower elevations to near 80 in the higher elevations.

Wednesday Night

Mostly clear, with lows in the mid-40s in the higher elevations to the lower 50s in the lower elevations.



HAZARDS

Hazardous weather is not expected...unless you consider fall-like conditions a hazard.

Air Quality




Air quality is in the upper range of green for most of the county, including the ridges and other higher elevations today.

Pollen

Pollen levels are expected to be in the low-medium range (4.2 out of 12) with ragweed, chenopods, and grasses being the main culprits. Tomorrow is expected to be a little higher in the low-medium range (4.3 out of 12).


Weather Extremes for Macon County for October 5th

Highest Temperature 91°F in Franklin in 1954 Lowest Temperature 25°F at the Coweeta Exerimental Station in 1968 Greatest One-Day Rain 3.67 inches at the Coweeta Exerimental Station in 1964 Greatest One-Day Snowfall (no snowfall has been recorded on this date since records began in 1872 


TROPICAL WEATHER
(The North Atlantic Hurricane Season runs from June 1st to Nov 30th)



Tropical Tidbit from Levi Cowan (video recoded yesterday afternoon)






Tropical Weather Outlook
NWS National Hurricane Center Miami FL
200 AM EDT Mon Oct 5 2020

For the North Atlantic...Caribbean Sea and the Gulf of Mexico:

The National Hurricane Center is issuing advisories on Tropical Storm Gamma, located over the extreme southern Gulf of Mexico just north of the Yucatan Peninsula, and on newly formed Tropical Depression Twenty-Six, located over the northwestern Caribbean Sea just south of Jamaica.

Tropical cyclone formation is not expected during the next 5 days.





Tropical Depression Twenty-Six Discussion Number 2
NWS National Hurricane Center Miami FL AL262020
1100 PM EDT Sun Oct 04 2020

Satellite data indicate that the disturbance just south of Jamaica has become better organized this evening. Microwave and shortwave infrared images indicate that the center is now well defined, and deep convection has been persisting near and to the south of the center. Based on this data, the system now meets the criteria to be considered a tropical depression. The initial intensity remains 30 kt for this advisory.

The depression is currently moving west-northwestward at 8 kt on the southern side of an Atlantic subtropical ridge. A continued west-northwest to northwest motion at about the same forward speed is expected during the next 24 to 36 hours, taking the system across the Cayman Islands and toward western Cuba. Around the time the depression is expected to be near western Cuba, the models show it accelerating northwestward as it moves in the faster flow between the ridge and Tropical Storm Gamma. This motion should bring the tropical cyclone into the southern Gulf of Mexico Tuesday night or early Wednesday. Later on, a notable slow down and a turn to the north is forecast to occur late in the week when the depression will likely be approaching the northern Gulf coast. This change in the forecast motion is a result of the ridge weakening and a trough approaching the cyclone from the west. The models are in relatively good agreement, which is surprising since they often diverge for weak systems, and the NHC track forecast lies near the middle of the guidance envelope.

There is currently some northeasterly shear affecting the depression, but the models all show the shear lessening by tomorrow and remaining fairly light for the next few days. These improving upper-level wind conditions combined with a moist air mass and warm waters should allow for at least steady strengthening during the next few days. By late in the week, when the storm is forecast to approach the U.S. Gulf coast, there could be an increase in southerly or southwesterly shear, which could limit additional strengthening by that time. The NHC intensity forecast lies fairly close to the IVCN and HCCA consensus aids, and shows the depression becoming a hurricane near western Cuba with additional strengthening over the Gulf of Mexico.

Users are reminded that the average 4- and 5-day NHC track forecast errors are about 160 to 200 miles at those time periods, respectively.

Key Messages:

1. Tropical storm conditions are expected in the Cayman Islands beginning late Monday, and a Tropical Storm Warning is in effect.

2. Dangerous storm surge and hurricane conditions are possible in portions of western Cuba and the Isle of Youth by Tuesday afternoon, and a Hurricane Watch is in effect.

3. Heavy rainfall will affect portions of Hispaniola, Jamaica, the Cayman Islands, and western Cuba during the next few days and could lead to life-threatening flash floods and mudslides.

4. The system is forecast to approach the northern Gulf Coast late this week as a hurricane. While there is large uncertainty in the track and intensity forecasts at these time ranges, there is a risk of dangerous storm surge, wind, and rainfall hazards along the coast from Louisiana to the western Florida Panhandle. Residents in these areas should monitor the progress of the system and check for updates to the forecast during the week.


FORECAST POSITIONS AND MAX WINDS

INIT 05/0300Z 17.0N 77.3W 30 KT 35 MPH
12H 05/1200Z 17.4N 78.3W 35 KT 40 MPH
24H 06/0000Z 18.3N 79.8W 40 KT 45 MPH
36H 06/1200Z 20.0N 81.9W 50 KT 60 MPH
48H 07/0000Z 22.2N 84.4W 65 KT 75 MPH
60H 07/1200Z 24.1N 87.0W 80 KT 90 MPH
72H 08/0000Z 25.4N 88.8W 85 KT 100 MPH
96H 09/0000Z 27.2N 90.4W 90 KT 105 MPH
120H 10/0000Z 30.0N 89.9W 75 KT 85 MPH...INLAND




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Published at 3:30am Monday, October 05, 2020


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