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FLASH FLOOD WATCH canceled Sunday morning

Anywhere from 3″ to 10″+ of rain has fallen since Thursday across the Brazos Valley
A Flash Flood Watch remains in effect for the majority of the Brazos Valley until 7am Sunday...
A Flash Flood Watch remains in effect for the majority of the Brazos Valley until 7am Sunday morning (Lee County 7pm Saturday)
Published: Apr. 30, 2021 at 8:23 AM CDT|Updated: May. 2, 2021 at 8:47 AM CDT
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BRYAN, Texas (KBTX) - The Flash Flood Watch that was in place for the Brazos Valley was allowed to expire early Sunday morning.

Areas of flooding and standing water are expected to slowly recede in the coming days. Officials urge residents to not drive through flooded roadways with the reminder, “Turn Around. Don’t Drown.”

11:15pm Saturday Update

A few showers still linger in our far eastern counties, but most of the Brazos Valley has seen a lull in the rain activity over the past couple of hours. As we head into the overnight, one last round of scattered showers and a few rumbles will be possible pre-sunrise Sunday morning. While not looking to spark huge fireworks, gusty winds and pockets of heavy rainfall will be possible with any activity found. While the majority of the activity looks to be out of the area by the time we are getting out and about for any early Sunday morning plans, we’ll hold onto an isolated chance for a lingering shower or two early Sunday morning. What’s left of the rain chance diminishes throughout the morning and more clearing & sunshine is in store by the afternoon!

7:45pm Saturday Update

The rain has come to an end for the western third of the Brazos Valley as this round of activity continues to track to the northeast.

Non-severe scattered rain & a few rumbles continue to track to the NE
Non-severe scattered rain & a few rumbles continue to track to the NE

While the majority of what’s left of this round should subside over the next few hours, we’ll still be monitoring for another round overnight. Scattered showers and a few rumbles will be possible if the activity can develop, with heavy rain and gusty winds once again being the primary things to monitor. Snapshots of what the radar could look like through the overnight hours can be found in the 6:45pm update below.

6:45pm Saturday Update

As this early evening round of rain knocks off over the next few hours, another is brewing for the overnight. Hi-res forecast models have been persistent in creating one last round of rain and thunderstorms for the Brazos Valley, generally between midnight and 5am.

One last round of rain and thunderstorms passes through the Brazos Valley pre-sunrise Sunday...
One last round of rain and thunderstorms passes through the Brazos Valley pre-sunrise Sunday before drier weather returns.(KBTX)

While the model above may be overdone a bit in intensity, the need to monitor for a strong storm or two will continue. Gusty wind and more heavy rain will run as the main concern. Speaking of which, another 0.5″ to 1″ of rainfall is up for grabs, but stronger activity could deposit 2″ to 3″ over localized portions of the far Eastern Brazos Valley.

Rain comes to an end, the Flash Flood Watch expires, and sunshine returns Sunday.

5:45pm Saturday Update

5:15pm Saturday Update

Axis of heaviest rain is swinging north on the leading edge of this evening’s rain. This is where there remains the potential for gusty wind and occasional lightning. As of this update, that was positioned from Northeast Milam, through Robertson to Northeast Brazos Counties. It was attempting to fill in with heavy rain down to Walker County.

Just after 5pm, heavy rain was pivoting toward the north and eastern Brazos Valley.
Just after 5pm, heavy rain was pivoting toward the north and eastern Brazos Valley.(KBTX)

Once this band moves through the Brazos Valley, majority of the flood concern and any small severe weather concern will pass. Light, steady rain is expected to continue through sunset before ending by 9pm to 10pm.

3:30pm Saturday Update

As a line of strong storms moves into the western reaches of the Brazos Valley, Flash Flood Warnings have been left in the wake up and down the I-35 corridor. Rainfall between 1″ and 3″ per hour has created multiple low-water crossings to become inundated along with several roads and surface streets. The National Weather Service noted that water crossings in Lavaca County were becoming inundated faster than county crews could get road closed signs in place.

A Flood Advisory is in effect for far Northwest Lee County until 6:45pm.

Flash Flood Warnings are in effect until early Saturday evening due to 1" - 3" of rain falling...
Flash Flood Warnings are in effect until early Saturday evening due to 1" - 3" of rain falling in an hour under strong storms(KBTX)

In the traditional sense, these storms have moved east through the afternoon in a non-severe state. Wind gusts 40-50mph are possible from the strongest portions of these storms. Occasional lightning has also been noted. Flooding will be the main concern as this activity moves in this evening.

A band of heavy rain dropped anywhere from 2″ to 8″ of rain across parts of Trinity, Walker, Montgomery, and San Jacinto Counties early Friday morning. Flash flood warnings and advisories have since expired, but flooded roads and standing water remain Saturday morning. DriveTexas.org lists parts of FM 1791, 2693, and 2989 closed due to flooding, among others.

By Saturday afternoon, a wide range of rainfall was reported from one end of the Brazos Valley to the other. While much of the northern side of the area has yet to collect 1″ of rain, southern counties have piled up anywhere from 3″ to 5″, with localized 8″ to 10″ totals since Thursday.

Rainfall totals as of 2pm Saturday across the Brazos Valley
Rainfall totals as of 2pm Saturday across the Brazos Valley

While the majority of the area has been able to see a break in the wet weather into Saturday afternoon, another round of rain and thunderstorms is expected to move through the Brazos Valley by the early evening hours. An additional 0.5″ to 2″ of widespread rain remains possible for the Brazos Valley, with localized 3″+ totals, before midnight

Another 0.5" to 2" of widespread rain remains possible for the Brazos Valley, with localized...
Another 0.5" to 2" of widespread rain remains possible for the Brazos Valley, with localized 3"+ totals.(KBTX)

In addition to more heavy rain, a few storms could be briefly strong-to-severe Saturday evening. Wind gusts in excess of 40mph and small hail could be common. Those storms that manage to strengthen to severe limits could produce hail up to quarter size and wind in excess of 60mph.

According to the National Weather Service, “flooding of low-lying, poorly draining, and other vulnerable locations such as easily-flooded streets are possible if they are impacted by storms with heavier rainfall rates and amounts. Multiple rounds of these storms would worsen the potential for flooding. Where rain rates are more manageable, previously dry conditions will help reduce concerns for flooding.”

The concern for ongoing rainfall through the weekend will keep the watch in effect until early Sunday morning.

Some other rainfall totals from our Weather Watchers around the Brazos Valley:

  • Anderson - 3.84″
  • Flo: 2″
  • South Bryan - 1.85″
  • Steep Hollow (as of Thursday night) - 0.75″
  • NW Huntsville - 4.20″
  • Carlos - 0.88″
  • Wellborn - 0.51″
  • Kurten - 0.90″
  • Stoneham - 2.89″
  • Nantucket, S. Brazos County - 1.00″

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