TellicoWx

New MCD out for southern valley: Discussion...Moisture is streaming in from the west-southwest within an atmospheric river moving into the region. Precipitable water values are currently 0.8-1.3". Inflow at 850 hPa is west-southwest at 30-50 knots per nearby VAD wind profiles, similar in direction and magnitude to the 850-400 hPa mean wind. MU CAPE remains under 100 J/kg for much of the area, though trends are upward across northern AL. Recent observations show hourly rain totals of 0.15-0.30", roughly 1/5 of the current precipitable water value, due to the lack of instability. With time, hourly rain totals are expected to rise to 0.5-1" as MU CAPE rises to 500+ J/kg across northeast AL and northern GA and convective elements become more common within the mostly stratiform rain areas. Mesoscale guidance generally advertises local amounts ~2", but 3" can't be ruled out during the next several hours. Two week precipitation anomalies are 150-300%+ of average, which has led to fairly saturated soils. Flash flooding is considered possible through 8 pm EDT.

High Risk has been extended into NW GA

Big question mark to me for today is around storm motion and orientation return flow. If the motion/return sets up more oriented ENE across N. AL then the results will be lowered (storms firing/training south of the area cutting off some of the flow from the gulf, plus a downslope component off the plateau)...HRRR/GFS. If it is orientated more NNE across N. AL, then the return up the southern valley will be greater and minimal downsloping (Euro Op/NAM).

Comparing the NAM, 3k, GFS, HRRR, Euro..with what has currently fallen here (.13). The Euro was the only one to have the rainfall into SE Monroe at this point.

High Risk out now to almost Chatt...WPC says there is still some uncertainty as to where to put the High Risk, could be moved north or south in further updates. For SE TN: Further downstream we have a Moderate risk across portions of northern GA into southeast TN and the far western Carolinas. Significant flooding is still possible here today/tonight. Slightly lower QPF and the expectation of weaker rates this far northeast, precludes the need for a High risk here. However, a Moderate Risk does cover these areas, which is still a significant and potentially life threatening risk level.

SPC Day 4:

Not surprising, a Flood Watch has been posted for south of I40. With area streams currently stressed (Tellico River is still running 200% above normal and is barely falling now) plus the snowpack up along the mountaintops that will melt and add to the totals, if any members (or family/friends) live in a flood prone area/ or potential to be cutoff by flooding across southeast TN...would be putting together some form of evacuation plan now. Add in SPC now has a 30% Day 4 severe near Chatt, looks like its gonna be a rough weather week.

13500 cubic feet per sec...haven't seen the Tellico River this high since it collapsed the Cherohala Skyway in 1993.

01z HRRR would be a big problem here

Yeah, not liking the 0z runs so far or the 01z HRRR here for SE TN. Models upped the totals. Alot of people this afternoon were talking about how the worse was over cause of the break...afraid alot are going to be caught off gaurd.

Big time flooding here in Monroe Co..houses starting to flood, roads impassable, and starting to evacuate some people in the county.

The common analog on SARS the last several runs is 4/18/69. That system produced an F4 in Greenville, AL killing 2. A total of 13 tornadoes formed, mostly in the F0-F2 range. A 218 mi path was also recorded in southern GA and rated F2. Storm caused 50 injuries, besides the 2 deaths in the F4.

Yeah, I got the counties crossed. 00z backed off. With the main low trending further north, the threat is lessening some.

By no means am I saying this is how it will play out, but it is a little unnerving the date of the analogs on the 18z NAM. April 1998 was the F5 in Davidson Co.

Flash Flood Watch for Whitley Co due to a possible dam about to fail: Including the cities of Corbin and Williamsburg 351 PM EST Mon Mar 4 2019 ...FLASH FLOOD WATCH IN EFFECT THROUGH TUESDAY AFTERNOON... The National Weather Service in Jackson has issued a * Flash Flood Watch for a portion of south central Kentucky, including the following area, Whitley. * Through Tuesday afternoon * Recent heavy rains have led to the strong potential of a dam failure on a dam on located along Corinth road in the Little Spruce Creek drainage about 2 miles southwest of Woodbine. * If the dam were to completely fail, flash flooding is expected for a couple of miles downstream of the dam.

Almost time to breakout the purples again unfortunately...12z GEFS

Will bust a little higher than most modeling (way higher than MRX/local forecasts). Most areas between Huntsville and southern Mid TN picked up around 1.5"

Yeah, GEFS has been putting a bullseye across parts of the upper/mid south for a couple days now...EURO has too, but with a little lesser amounts.

Most of the bright returns over west TN is brightbanding. 3k was a little to slow and Euro a little too far south, but so far amounts in west TN are close to what GFS had. Big question is does the convection develop over central/southern AL robbing the moisture transport north.

Picked up 1.14" so far here and still pouring

Big jump N on the 18z NAM...hopefully on overcorrection

Definitely need to keep an eye on the weekend system across SE TN...Euro/NAM/CMC 12z suite showing 3"-5" across NW GA. GFS has similar range further south over Atlanta.

12z Euro

Pic from Knox Mayor of a sinkhole just opened this morning in Powell

Reports of a landslide on Northshore Dr in Knoxville now