Alert archive / Texas / Flash Flood Warnings in 2021
Flash Flood Warning 16, NWS Houston/Galveston, TX
NWS Houston/Galveston, TX issued this flash flood warning at May 24, 2021, 12:42 PM CDT for Harris County, Montgomery County, Texas. It was in force for 3 hr. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- May 24, 2021, 12:42 PM CDT (17:42 UTC)
- Expired
- May 24, 2021, 3:45 PM CDT
- In force
- 3 hr
- Issued by
- NWS Houston/Galveston, TX
- Area
- Storm-based polygon
- Flood severity
- None
Counties Harris County, TX, Montgomery County, TX
The radar
The Houston radar (KHGX), 37 km from the middle of the area, began a volume at 17:44 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 24, 1:07 PM CDT | FLASH FLOOD | 4 Ese West University P, TX | LOCAL MEDIA SHOWS VIDEO FROM HOUSTON TRAFFIC CAMS SHOWING WATER COVERING SH-288 AT HOLCOMBE BLVD. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Lake Charles Mun, LA (KLCH), launched 12:00Z, 5.7 hours before the alert went out and 204 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 505 J/kg
- Mixed-layer CIN
- -5 J/kg
- Mixed-layer LCL
- 687 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 118 m²/s²
- 0-3 km storm-relative helicity
- 119 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.5
The text
As transmitted.
145
WGUS54 KHGX 241742
FFWHGX
TXC201-339-242045-
/O.NEW.KHGX.FF.W.0016.210524T1742Z-210524T2045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Houston/Galveston TX
1242 PM CDT Mon May 24 2021
The National Weather Service in League City has issued a
* Flash Flood Warning for...
Harris County in southeastern Texas...
Southeastern Montgomery County in southeastern Texas...
* Until 345 PM CDT.
* At 1242 PM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 4 inches of rain
have fallen. Flash flooding is ongoing or expected to begin
shortly. A band of storms continues to bring heavy rainfall to the
area and these storms will be tracking across areas that have
already been hit by earlier rainfall. Rainfall rates of nearly
3"/hour will be likely with these storms. Street flooding will
likely we worsening across the area.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Doppler radar.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other
drainage and low lying areas.
* Some locations that will experience flash flooding include...
Northwestern Pasadena, northern Pearland, Deer Park, South
Houston, Bellaire, Humble, West University Place, Galena Park,
Jacinto City, Greater Fifth Ward, Second Ward, Near Northside
Houston, Cloverleaf, Greater Eastwood, Downtown Houston, Greater
Third Ward, southeastern Northside / Northline, Fourth Ward,
Midtown Houston and Greater Heights.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, urban areas, highways, streets and underpasses
as well as other drainage areas and low lying spots.
&&
LAT...LON 2958 9542 2964 9544 2973 9545 2980 9542
2986 9535 3002 9533 3010 9533 3010 9528
3004 9520 2996 9513 2987 9510 2971 9511
2971 9516 2972 9523 2959 9518 2957 9522
2957 9525 2959 9526 2960 9528 2960 9533
FLASH FLOOD...RADAR INDICATED
$$The office that day
Everything else NWS Houston/Galveston, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 23, 10:07 PM CDT | Rip Current Statement | HGX | Brazoria, Galveston, Matagorda | 65 hr |
| May 24, 9:28 AM CDT | River Flood Warning | HGX | Lavaca | 31 hr |
| May 24, 10:19 AM CDT | Areal Flood Advisory | HGX | Brazoria, Fort Bend, Harris, Montgomery, Waller | 116 min |
| May 24, 11:14 AM CDT | Areal Flood Advisory | HGX | Harris, Montgomery | 3 hr |
| May 24, 11:40 AM CDT | Special Marine Warning | HGX | 50 min | |
| May 24, 11:42 AM CDT | Areal Flood Advisory | HGX | Brazoria, Fort Bend, Galveston, Harris | 2 hr |
| May 24, 1:54 PM CDT | Special Weather Statement | HGX | Brazoria | 51 min |
| May 24, 2:50 PM CDT | Areal Flood Advisory | HGX | Brazoria | 115 min |
| May 24, 3:44 PM CDT | Areal Flood Warning | HGX | Brazoria, Harris | 2 hr |
| May 24, 5:47 PM CDT | Flash Flood Warning | HGX | Austin, Colorado, Washington | 4 hr |
| May 24, 6:18 PM CDT | Special Weather Statement | HGX | Austin | 42 min |
Nearby
Flash Flood Warnings in Texas, 2021Every flash flood warning in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.