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* Rainstorm tracker monitor and alert decision-makers about the severity of storm events over the Lower Mekong basin in near-real and real-time. by Satellite-based Precipitation Products (SPP).
Source: SERVIR SEA/ADPC
Source: GSMaP NOW
This map shows the 24-hour rainfall accumulation using GSMaP NOW satellite-based precipitation estimates.
FFG - Flash Flood Guidance: The amount of rainfall over a given duration (1, 3, 6 hours) which is just enough to cause bank-full flow in the draining stream outlet.
MAP - Mean Areal Precipitation: Derived mean areal precipitation estimates from bias-adjusted Micro-Wave Global Hydro Estimator (MWGHE) and GHE.
ASM - Average Soil Moisture: Soil water saturation fraction (dimensionless ratio of contents over capacity) for the upper zone (approximately 20-30 cm depth).
FMAP - Forecast Mean Areal Precipitation: Accumulations of forecasted mean areal precipitation produced by numerical forecasts from the Weather Research and Forecasting (WRF) model. Each data product reflects basin-average precipitation accumulations from the navigation hour over the corresponding interval.
FFFT - Forecast Flash Flood Threat: The difference between the predicted rainfall (FMAP) and the amount needed to reach the bank full stage (FFG). Basin/sub-basin with a positive FFFT value is assumed to be an area with the potential for flash floods in the given time range.
FFR - Flash Flood Risk: Products for forecast periods of 12, 24 and 36 hours (forecast periods 12 and 24 hours are shown in this bulletin). These products are computed every six hours and measure the occurrence of positive forecast flash flood threat (FMAP > FFG) over a given forecast period using forecast precipitation to drive the Soil and FFG models.
| ASM (Average Soil Moisture) | Classification |
|---|---|
| 0.01 < ASM < 0.65 | Normal state |
| 0.65 < ASM < 0.9 | Nearly saturation state |
| 0.9 < ASM ≤ 1 | Saturation state |
| FFR (Flash Flood Risk) |
|---|
| Low (Be Updated) |
| Moderate (Be Prepared) |
| High (Take Action) |
| FFG (Flash Flood Guidance) | |||||
|---|---|---|---|---|---|
| FFG 01 Hrs | Classification | FFG 03 Hrs | Classification | FFG 06 Hrs | Classification |
| FFG ≤ 10 | High | FFG ≤ 10 | High | FFG ≤ 15 | High |
| 10 < FFG ≤ 25 | Moderate | 10 < FFG ≤ 25 | Moderate | 15 < FFG ≤ 30 | Moderate |
| 25 < FFG ≤ 40 | Low | 25 < FFG ≤ 40 | Low | 30 < FFG ≤ 60 | Low |
| MAP; FMAP (Precipitation) | Classification | |
|---|---|---|
| (mm/6hr) | (mm/24hr) | |
| Rainfall < 7,5 | < 10 | Light rain |
| 7.5 < Rainfall ≤ 35 | 10 < Rainfall ≤ 50 | Moderate rain |
| 35 < Rainfall ≤ 70 | 50 < Rainfall ≤ 100 | Heavy rain |
| Rainfall > 70 | Rainfall > 100 | Very heavy rain |
* This Bulletin is meant to contribute to forecasting flash flood events for meteorologists and relate experts in each member country and enhancing flash flood warning information for the overall area of the Lower Mekong basin.