Summary: Low white and grey stratus clouds looked to cover the whole sky and maybe sometimes most of the sky, during the morning, afternoon, evening, and night. The wind speeds were light with moderate and moderately strong gusts. Light to moderate and moderately heavy and heavy showers passed through the Houston, TX area, during the morning, afternoon, evening, and night. It felt cool, during the early and mid-morning. It felt a little cool, during the late morning. It felt warm, during the afternoon and early evening. It felt very cool, during the late evening. It felt cold, during the early night.
Area Forecast Discussion
Issued by NWS Houston/Galveston, TX
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000 FXUS64 KHGX 302110 AFDHGX Area Forecast Discussion National Weather Service Houston/Galveston TX 310 PM CST Wed Dec 30 2020 .SHORT TERM [Thursday Through Friday Night]... Seeing scattered showers developing this afternoon across the area in the warm moist airmass southeast of a cold front that is located to the southeast of College Station as of 3pm. The cold front is expected to slow later this evening and stall across the central counties tonight bringing widespread showers and some thunderstorms. A Flash Flood watch is in effect for most of southeast Texas tonight through 3 PM Thursday. The heavy rainfall threat will increase later this evening as the front edges southeastward and slows. High res models indicate hourly rainfall rates of 1 to 2 inches are likely near the front overnight. This is a good setup for training storms late tonight and into tomorrow with storm total rainfall amounts likely in the 2 to 4 inches and isolated amount of 6 inches possible. A surface low will develop and deepen while moving northeast along the quasi-stationary boundary tonight and Thursday. As this occurs, showers and thunderstorms will increase across a broad region of southeast Texas. Some of the storms could be severe, especially Thursday morning southeast of the surface low as indicated by the slight risk from SPC. Within that slight risk area, a few supercell thunderstorms are possible with hail, strong winds and isolated tornadoes all threats. Expecting showers and storms to end from the southwest to the northeast Thursday afternoon, which is a bit atypical because the surface low is so far south with this storm system. 35/33 .LONG TERM [Friday Through Wednesday Night]... The start of 2021 will start out our long term period. Surface high pressure will be building over Texas in the wake Thursday`s disturbance ending the rainfall threat and bringing in cooler temperatures through the weekend (high temperatures in the mid to upper 50s and overnight lows in the mid to upper 30s). There will be a couple of upper level troughs swinging across the region through the weekend with the first one moving through Saturday afternoon, and a second, weaker wave on Sunday afternoon. The surface high pressure will help prevent any shower activity from forming this weekend, but partly cloudy skies will likely persist, especially across the north third of the area. The surface high pressure slides to the east by Monday bringing southerly flow back into the area that will help increase temperatures through midweek. Weak midlevel ridging will also be passing through Monday into Tuesday helping to increase temperatures. Afternoon highs Monday into Tuesday will climb into the upper 60s into low 70s. An upper level low will be moving across the Four Corner region on Tuesday with the associated surface low developing in the Great Plains late Tuesday into early Wednesday. The increasing moist southerly flow will bring the potential for rain showers beginning overnight Tuesday into Wednesday morning. The associated cold front is currently expected to move through SE Texas during the day on Wednesday bringing a chance of showers and thunderstorms before exiting to the east Wednesday night. Fowler && .MARINE... A complex weather system will be moving through the area tonight into Thursday afternoon bringing a mixture of heavy rainfall and strong thunderstorms. The flow through tonight will be generally south-southeasterly with scattered showers and thunderstorms ahead of an approaching cold front. This cold front will end up stalling inland tonight, but a low pressure system will develop along the cold front by Thursday morning and then move to the northeast through the day on Thursday. There is a chance of strong to severe thunderstorms capable of producing heavy downpours, strong wind gusts/rough seas, and even isolated waterspouts out ahead of the developing cold front. The cold front will move through the area from west to east Thursday afternoon ending the severe weather and rain threat. However, strong westerly winds are expected to develop behind the exiting front with sustained winds over the Gulf Waters 20 to 30kts with frequent gusts to 40kts beginning Thursday afternoon through early Friday morning with wave heights building to 7 to 12 feet. Because of these conditions, the Gale Watch has been upgraded to a Gale Warning. The Bays will have wind gusts to 30 kts for the same time period, so have kept them in a Small Craft Advisory for the time being, but they may also approach Gale conditions. The strong westerly winds Thursday into Friday will bring the potential for low water levels in the Bays at low tides Friday and Saturday. PETSS guidance currently has tides at around a foot below Mean Low Low Water Friday and Saturday morning, so there is potential for the need for Low Water Advisories then. Winds and seas lower through the weekend as high pressure builds overhead. Onshore flow returns for the start of next week as the high pressure slides eastward with the next potential front moving through midweek next week. Fowler && .PREV DISCUSSION /Issued 1232 PM CST Wed Dec 30 2020/... .AVIATION [18Z TAF Issuance]... Quite the set up today as a boundary passes the northern terminals and then stall in the IAH to SGR area tonight. by tomorrow morning, a low will move into the southwestern area and move over the SGR- CXO terminals then migrates out of the area tomorrow night. Impacts associated with this system are lower ceilings in the northern flying areas and areas of heavier rainfall and thunderstorms will bring in IFR conditions or lower tomorrow. LIFR ceilings are expected with wrap around moisture as the low moves over the area but mainly effecting the central and northern flying areas. Once the system moves out tomorrow evening, stable/drier airmass will dominate and VFR conditions will prevail into next week. 35 && .PRELIMINARY POINT TEMPS/POPS... College Station (CLL) 45 56 37 54 35 / 100 100 20 0 0 Houston (IAH) 62 67 41 58 39 / 90 100 10 0 0 Galveston (GLS) 64 68 45 58 44 / 50 100 10 0 0 && .HGX WATCHES/WARNINGS/ADVISORIES... TX...Flash Flood Watch from 6 PM CST this evening through Thursday afternoon for the following zones: Austin...Brazoria Islands...Brazos...Burleson...Coastal Brazoria...Coastal Matagorda...Colorado...Fort Bend...Grimes...Houston...Inland Brazoria...Inland Harris...Inland Jackson...Inland Matagorda...Madison...Matagorda Islands...Montgomery...Polk...San Jacinto...Trinity...Walker...Waller...Washington...Wharton. High Rip Current Risk through Thursday morning for the following zones: Brazoria Islands...Galveston Island and Bolivar Peninsula...Matagorda Islands. GM...Small Craft Advisory from noon Thursday to 6 AM CST Friday for the following zones: Galveston Bay...Matagorda Bay. SMALL CRAFT SHOULD EXERCISE CAUTION through Thursday morning for the following zones: Galveston Bay...Matagorda Bay. Small Craft Advisory until noon CST Thursday for the following zones: Coastal waters from Freeport to Matagorda Ship Channel TX out 20 NM...Coastal waters from High Island to Freeport TX out 20 NM...Waters from Freeport to Matagorda Ship Channel TX from 20 to 60 NM...Waters from High Island to Freeport TX from 20 to 60 NM. Gale Warning from noon Thursday to 6 AM CST Friday for the following zones: Coastal waters from Freeport to Matagorda Ship Channel TX out 20 NM...Coastal waters from High Island to Freeport TX out 20 NM...Waters from Freeport to Matagorda Ship Channel TX from 20 to 60 NM...Waters from High Island to Freeport TX from 20 to 60 NM. && $$
Flash Flood Watch
Flood Watch National Weather Service Houston/Galveston TX 1129 AM CST Wed Dec 30 2020 TXZ163-164-176>179-195>199-210>213-226-227-235>237-336-337-
436-437- 311100- /O.NEW.KHGX.FF.A.0006.201231T0000Z-201231T2100Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Houston-Trinity-Madison-Walker-San Jacinto-Polk-Burleson-Brazos- Washington-Grimes-Montgomery-Colorado-Austin-Waller-Inland Harris- Wharton-Fort Bend-Inland Jackson-Inland Matagorda-Inland Brazoria- Coastal Matagorda-Coastal Brazoria-Matagorda Islands-Brazoria Islands- Including the cities of Brookshire, Pearland, Caldwell, The Woodlands, Coldspring, Bellville, Bay City, Trinity, Shepherd, Columbus, Sugar Land, College Station, Hempstead, Huntsville, Crockett, Wharton, Conroe, Missouri City, Pecan Grove, Palacios, Bryan, Lake Jackson, Surfside Beach, Freeport, First Colony,
Clute, Eagle Lake, Livingston, Brenham, Waller,
Navasota, Houston, Prairie View, Groveton, Sealy, Rosenberg, Edna, Alvin, Ganado, Corrigan,
El Campo, Mission Bend, Angleton, Somerville, Weimar,
and Madisonville 1129 AM CST Wed Dec 30 2020 ...FLASH FLOOD WATCH IN EFFECT FROM 6 PM CST THIS EVENING THROUGH THURSDAY AFTERNOON... The National Weather Service in League City has issued a * Flash Flood Watch for portions of south central Texas and southeast Texas, including the following areas, in south central Texas, Inland Jackson. In southeast Texas, Austin, Brazoria Islands, Brazos, Burleson, Coastal Brazoria, Coastal Matagorda, Colorado, Fort Bend, Grimes, Houston, Inland Brazoria, Inland Harris, Inland Matagorda, Madison, Matagorda Islands, Montgomery
, Polk, San Jacinto, Trinity, Walker, Waller, Washington
and Wharton. * From 6 PM CST this evening through Thursday afternoon * A cold front will move into southeast Texas late this
afternoon and stall tonight from near Matagorda Bay to Houston to Livingston. Widespread showers and thunderstorms will develop this evening
in the vicinity of the boundary and expand in coverage
after midnight and into Thursday morning as a surface low forms and moves off
to the northeast. Heavy rainfall will end from the southwest to northeast Thursday afternoon. Rainfall
amounts are expected to average 2 to 4 inches in the watch area with
isolated amounts of 4 to 6 inches possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flash Flood Watch means that conditions may develop that lead to Flash Flooding. Flash Flooding is a very dangerous situation. You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued. Do not enter or cross flowing water or water of unknown depth. && $$
Flood Advisory
Flood Advisory National Weather Service Houston/Galveston TX 932 PM CST Wed Dec 30 2020 TXC185-201-339-471-310630- /O.NEW.KHGX.FA.Y.0123.201231T0332Z-201231T0630Z/ /00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Grimes TX-Harris TX-Montgomery TX-Walker TX- 932 PM CST Wed Dec 30 2020 The National Weather Service in League City has issued a * Urban and Small Stream Flood Advisory for... Southeastern Grimes County in southeastern Texas... Harris County in southeastern Texas... Western Montgomery County in southeastern Texas... Southwestern Walker County in southeastern Texas... * Until 1230 AM CST. * At 932 PM CST, Doppler radar indicated heavy rain due to thunderstorms. This will cause urban and small stream flooding. Between 1 and 4 inches of rain have fallen. Some locations that will experience flooding include... Western Conroe, southern Huntsville, Tomball, Willis, Pinehurst, The Woodlands, Panorama Village, Magnolia, New Waverly, Montgomery, Stagecoach, Lake Conroe Dam, Huntsville State Park, Hooks Airport, Dobbin and Dacus. Additional rainfall of 1 to 2 inches is expected over the area.
This additional rain will result in minor flooding. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flood Advisory means river or stream flows are elevated, or ponding of water in urban or other areas is occurring or is
imminent.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
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.
Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, country roads, farmland, and other low lying
spots.
&&
LAT...LON 3057 9582 3068 9570 3070 9557 3060 9550
3041 9545 3023 9551 3014 9550 3008 9550
3003 9551 2999 9562 3007 9572 3015 9576
3027 9579 3038 9581
$$
Flood Advisory
Flood Advisory National Weather Service Houston/Galveston TX 756 PM CST Wed Dec 30 2020 TXC201-339-473-310430- /O.NEW.KHGX.FA.Y.0122.201231T0156Z-201231T0430Z/ /00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Harris TX-Montgomery TX-Waller TX- 756 PM CST Wed Dec 30 2020 The National Weather Service in League City has issued a * Flood Advisory for... Harris County in southeastern Texas... Western Montgomery County in southeastern Texas... East Central Waller County in southeastern Texas... * Until 1030 PM CST. * At 756 PM CST,
Doppler radar indicated heavy rain due to showers and thunderstorms. Minor flooding is
ongoing or expected to begin shortly in the advisory area.
Between 1 and 3 inches of rain have fallen. Some locations that will experience flooding include... Conroe, Katy, Tomball, Willis, Pinehurst, The Woodlands, Hockley
, Panorama Village, Magnolia, Montgomery, Stagecoach, Lake Conroe Dam and Cypress. Additional rainfall of 1 to 2 inches is expected over the area.
This additional rain will result in minor flooding. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flood Advisory means river or stream flows are elevated, or ponding of water in urban or other areas is occurring or is
imminent.
Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, country roads, farmland, and other low lying
spots.
&&
LAT...LON 3015 9586 3025 9580 3051 9566 3046 9543
3037 9541 3008 9560 2981 9583 2999 9590
$$
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