Hydrometeorological Discussion
Issued by NWS Tuscaloosa, AL
Issued by NWS Tuscaloosa, AL
611 AGUS74 KWCO 131515 HMDNWC National Hydrologic Discussion - EXPERIMENTAL NWS National Water Center - Tuscaloosa AL 1015 AM CDT FRI JUN 13 2025 .Synopsis... River flooding ongoing, flash flooding remains possible today in portions of Texas... Isolated flash and urban flooding possible today in the Lower Mississippi Valley and through this weekend in Virginia and West Virginia... Snowmelt could lead to river flooding in Northern Alaska... Localized flooding possible in Puerto Rico beginning late this weekend... .Texas... Minor to isolated major river flooding is ongoing and forecast into early next week from the San Antonio basin in south central TX to the Sabine basin in northeast TX. The major river flooding is currently confined to the Neches and Navasota rivers, with crests on both forecast to occur by the end of the weekend. Flash, small stream, and areal flooding are possible today along the upper TX Gulf Coast, including portions of the Houston metropolitan area, due to 1 - 3" of rainfall expected. This area has received 2 - 4" of rainfall over the past 48 hours (MRMS), leaving soils saturated and the hydrologic environment primed for additional/renewed flooding impacts. .The Lower Mississippi Valley... Isolated flash flooding is possible today across portions of southern LA, AR, northern MS, and western TN due to convective rainfall. Some of these areas have received 2 - 4" of rainfall over the past 48 hours (MRMS), leaving them sensitive to additional/renewed flooding impacts. While there is some ongoing and forecast minor to moderate river flooding in northwest LA, streamflows are generally near normal across these areas (USGS), and widespread small stream and river flooding is not anticipated. .Virginia and West Virginia... Isolated flash flooding is possible through day 3 (Sun) due to multiple rounds of convective rainfall. Rainfall forecasts continue to indicate that the highest totals are expected across eastern VA, and those amounts have increased in magnitude (3 - 7"). Intense rainfall rates with this event will be the primary driver of any flooding impacts, especially over the complex terrain in WV. Any small stream or higher magnitude flooding impacts will be somewhat dependent on the location of the highest rainfall amounts each day and whether any location or area sees repeated heavy rainfall over the event. .Northern Alaska... Flooding along North Slope rivers is possible beginning today through day 5 (Tue). An above average late season snowpack combined with temperatures rising into the 60s and 70s is expected to cause a rapid snowmelt. With ice intact on larger rivers, such as the Sag and Colville, in the area, ice jams could result from the snowmelt entering the rivers and lead to sudden rises and flooding. High flows or flooding could lead to bank erosion that could threaten nearby roads. River levels are likely to crest late this weekend into early next week. .Puerto Rico... Urban and small stream flooding and isolated flash flooding is possible on days 3 - 5 (Sun - Tue) due to an expected increase in daily shower and thunderstorm activity over northern and western portions of the island, including the San Juan metro area. //Watson $$