Much more rain still to come
Harvey’s circulation is located in a near-ideal spot for funneling vast amounts of moisture from the Gulf of Mexico toward the upper Texas coast. Here, converging winds at low levels have been concentrating the moisture into north-south-oriented bands of intense thunderstorms with torrential rain. Since Harvey is barely moving, these bands are creeping only slowly eastward as individual cells race north along them—a “training” set-up that is common in major flood events.
Mesoscale models, our best guidance for short-term, small-scale behavior of thunderstorms, show little sign of relief for southeast Texas anytime soon. Convection-resolving mesoscale models, which have a tight enough resolution to depict individual thunderstorms, are an invaluable tool in situations like this. The mesoscale nested NAM model predicts that 20” – 30” of additional rainfall is likely through Tuesday across the Houston metro area, with even larger totals at some points
Rainfall reports to date
As of 10 am CDT Sunday, the
National Weather Service Storm Summary (updated every 6 hours) listed four locations near Houston that had received over 24” of rain since the storm began on Thursday:
DAYTON 0.2 E 27.45
SANTA FE 0.7 S 27.42
SOUTH HOUSTON 4.0 SSW 24.54
LA MARQUE 1.8 E 24.53
LEAGUE CITY 2 W 22.08
BACLIFF 21.62
PEARLAND 3 NNE 20.84
BERRY BAYOU AT NEVADA AVENUE 19.52
BEAMER DITCH AT HUGHES ROAD 19.28
LA GRANGE 10.2 NW 18.89
HORSEPEN CREEK AT BAY AREA BOULEVAR 18.56
CIRCLE D-KC ESTATES 3.6 ESE 18.02
SUGAR LAND 1.0 W 17.97
CLEAR CREEK AT BAY AREA BLVD 17.84
MAGNOLIA 2.8 S 17.80
PASADENA 2 NW 17.72
WALLER 3.0 WSW 17.57
HOUSTON 1.4 NE 17.22
GOOSE CREEK AT BAKER ROAD 16.56
CLEVELAND 3.6 S 16.43
NEW ULM 5.1 S 16.14
PECAN GROVE 1 NNW 15.80
SMITHVILLE 15.77
ALVIN 3 SW 15.16
AUSTWELL 6 SSE 15.10
VICTORIA 2 SW 9.37
HOUSTON/HULL FIELD 7.33
CORPUS CHRISTI INTL ARPT 2.70
https://www.wunderground.com/cat6/mammoth-flood-disaster-houston-more-rain-yet-come