Andrew Miskelly
@andrewmiskelly
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Learning from meteorologists, climatologists, engineers, cartographers, aviators, authentic Christians and other good sorts. Software Engineer @weatherzone
Mittagong, Australia
Joined September 2010
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The inland rivers of NSW are not usually broad enough to be visible from geostationary satellites, stationed 36,000 km above the equator.
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Atmospheric gravity waves caused by outflow from thunderstorms over northern WA pushing into stable air near the coast.
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Kelvin-Helmholtz instability at the interface between two air masses over the Tasman Sea.
H/T:
@callumstu89
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Hector. (A thunderstorm that is triggered by sea breeze fronts over the Tiwi Islands, near-daily at this time of year.)
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Atmospheric moisture and precipitation over Australia and surrounds during 2022.
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Indonesia's Mount Sinabung (North Sumatra) erupting earlier today, as seen from Himawari-8.
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All 40.5 million lightning pulses detected over Australia by
@weatherzone
's Total Lightning Network during November.
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Snow falling on Mount Gibraltar, between Bowral and Mittagong.
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The effect of Thursday's solar eclipse, as captured by the visible bands from Himawari-9.
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Thunderstorm outflow produces atmospheric gravity waves in the stable air over WA's Pilbara Coast.
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Explosive cyclogenesis over the Celtic Sea, as
#StormCiar
án responds to clashing polar and subtropical air masses.
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Imagery from Sentinel-2A showing the Clyde Mountain Fire (near Batemans Bay, NSW) and associated cumulus flammagenitus (pyrocumulus) at around 11:07 AEDT.
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The Darling River at Bourke, NSW during the last year. Imagery from Sentinel-2 via
@sentinel_hub
.
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Steam/ash plume and pumice raft from the Fukutoku-Okanoba submarine volcano, south east of Japan.
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Movement of atmospheric moisture over Australia and surrounds during 2023.
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Snow and fog over Mittagong, NSW, from Mount Gibraltar.
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Floodwater progressing westward through the Murray-Darling Basin. This loop covers around 10 weeks.
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The potential duration of the warm → hot spell developing over south east Australia is staggering. Here's GFS, all the way out to the Buckley's and none end of the run.
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The polar jet paying south east Australia another visit. Its subtropical counterpart is racing along at around 330 km/h, in response to the northward surge of cold air.
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Dust carried over the Indian Ocean by the hot, dry south easterlies blowing across WA's Pilbara and Kimberley regions.
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Southerly winds on the western flank of the system over SA blowing dust from interior WA 1000 km to the Indian Ocean.
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The stupendous cumulus field associated with the cold change affecting southern Australia.
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This band of thunderstorms maintained a speed of about 100 km/h as it traversed Sydney. Try doing that on the M4.
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Cold air rushing through Cook Strait, constricted by terrain laterally and a subsidence inversion vertically.
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Water vapour satellite imagery highlighting the Antarctic origins of today's weather over SE Australia.
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With the sun having set for the winter, the stratospheric polar vortex is up and running over the south polar region.
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Around 660,000 lightning pulses were detected over Australia during the last 36 hours. That's pretty unusual for June! ⚡️
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The Hay Plains, where the Lachlan River approaches the Murrumbidgee from the north east, before the latter joins the Murray west of Balranald. Reports from the ground describe the plains as like an "inland sea". Imagery from MODIS/Terra this morning.
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Thick smoke allowed a spectacular view on Doppler radar of the southerly buster moving through Sydney.
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Rainfall totals for south east Australia during the next week, according to a handful of global forecast models. The convective nature of the weather accounts for some of the variation - and hopefully some overestimation.
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Sydney is having its wettest year in over 160 years of records. Here's how atmospheric moisture and pressure patterns have combined to produce the rain.
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September's south polar stratospheric warming recently propagated down through the troposphere. The temperature gradient between the polar region and the subtropics is reduced, the polar jet weakens and the polar front drifts a bit further north than might otherwise be the case.
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Ex-Tropical Cyclone Gabrielle's journey from the Coral Sea to New Zealand.
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Colliding air masses keeping things soggy over SA.
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When a coastal breeze arrives and *cools* the temperature to 40°C. The maximum temperature at Carnarvon, WA today was 49.9°C.
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Some folks in showery eastern Australia are wondering where El Niño is. Well, it's still there, more or less inside the black box.
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Snow falling on Mount Gibraltar, between Bowral and Mittagong, NSW.
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A gusty south easterly surge over NW WA - perhaps enhanced by outflow from last night's thunderstorms over the Northern Interior - carries a plume of dust out over the Indian Ocean.
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Who benefits from the moisture once the tropical cyclones dissipate will be governed both by their tracks and the availability and timing of cold fronts - which convert moisture into rain. Lake Eyre's catchment could get a boost; perhaps also the Darling. Early days.
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The Darling River floodplain near Louth, NSW looking positively verdant in the wake of recent flooding.
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Lightning activity over eastern and northern Australia between Thursday and Sunday.
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It's not every day that a 984 hPa low drifts across south east Australia.
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Christmas thunderstorm outbreak over eastern Australia.
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Today's subsidence inversion means this maritime stratocumulus had to find a way around rather than over Tasmania's Central Plateau.
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Thunderstorms over eastern Australia producing around 3000 lightning pulses per minute.
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Super Typhoon Mawar continues to astonish with its structure and stamina.
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Water in almost every outback creek, river and lake.
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Upper atmospheric moisture streaming from the tropical low off the Kimberley (now Tropical
#CycloneBlake
), across SE Australia. Conversion of this into rain requires interaction with cool upper air from the south. A little of this is occurring over SA, VIC and southern NSW.
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Progress of floodwater in QLD's Diamantina River and Eyre Creek since the beginning of February.
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Weereewa / Lake George over the last three years. Imagery from Sentinel-2.
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The slow-moving nature of the upper low driving the prolonged thunderstorm outbreak over eastern Australia.
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Another polar air mass lands over south east Australia.
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Cumulonimbus flammagenitus (pyrocumulonimbus) over the NSW South Coast, between Bermagui and Narooma. Combined effect of the fire, and convergence of the inland north westerly, coastal north easterly and southerly change.
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Kati Thanda-Lake Eyre always ready for a drink; ex-Tropical Cyclone Kirrily near-stationary over western QLD; glimpses of Diamantina River floodwater through the cloud.
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Frigid polar air mass producing cloud streets over the relatively warm Sea of Japan. The streets are more prominent in the lee of higher mountains (identifiable by their snowiness).
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Satellite imagery showing the spectacular, vertically stacked low pressure system near TAS and the deep cold air moving over SA/VIC, in the direction of NSW/ACT.
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The cloud of volcanic ash/gas (appears green/yellow) produced by Saturday's eruption in Tonga now extends over the Indian Ocean. It's being carried by easterly winds in the stratosphere.
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Australia in 2019. Seldom obscured by cloud - and ending in disaster for parts of the south.
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Tropical Cyclone Freddy, having formed north of WA on 6 February, may yet traverse the Indian Ocean. There’s decent model consensus around a landfall over Madagascar in the middle of next week.
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The scale of floodwater in the Diamantina River, as it edges southward on its journey to Kati Thanda-Lake Eyre.
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A spectacular cumulus field marks the unseasonably cold air mass over the Great Australian Bight.
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The upper-level low that's driving the thunderstorms and rain over eastern Australia. 😵💫
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The sooner those Diamantina River floodwaters get to Kati Thanda-Lake Eyre, the better. Dust from the lakebed is being lofted by scorching southerly winds this evening.
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Cool upper air will combine with a buildup of atmospheric moisture to produce widespread showers and thunderstorms over eastern Australia later this week.
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The Diamantina River flood now at Goyder Lagoon, and about to enter the Warburton River (home straight to Kati Thanda-Lake Eyre).
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Against the run of play, a buildup of atmospheric moisture ahead of a cold front is producing showers and thunderstorms over eastern Australia.
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Antarctic sea ice anomalies during the austral winter to date. Coloured areas highlight differing ice concentration in 2023, when compared with 1991 to 2020.
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A 400 km long roll cloud off north west WA. The (atmospheric) wave producing the cloud is moving at around 45 km/h (24 knots).
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A phytoplankton bloom in the Coral Sea, brought about by upwelling in the wake of Tropical Cyclone Gabrielle, which is now 2500 km to the south east.
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Morning Glory over the Gulf of Carpentaria this morning.
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Satellite imagery showing an area of deep, cold air starting to pivot around the intriguing complex of lows south of TAS.
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Weereewa / Lake George finishes 2021 in good shape. Imagery from Sentinel-2.
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A pronounced and prolonged loop in the jet stream over WA marks the system expected to produce an unseasonable soaking for parts of north western and central Australia this week.
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Rainfall projections for south east Australia this week, from a handful of global forecast models.
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Spectacular satellite imagery showing the deep Antarctic air mass approaching south east Australia.
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Bushfire smoke marking the progress of an easterly wind change over the central ranges of NSW.
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Water (relatively cool) in the Darling, Lachlan and Murray Rivers inhibiting convection over western NSW.
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Spring cold front on the way for south east Australia. The proximity of 🔵 and 🔴 promises some dynamic weather.
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The low pressure system wheeling its way along the Antarctic coastline is about to fling a destabilising air mass in the direction of south east Australia, just in time for Christmas.
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Bushfire smoke over NSW highlights the progress of a low level easterly wind change as it climbs the eastern slopes of the Divide, under westerly winds aloft.
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