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A few nice weather images I found:
NASA Satellites See Wind Shear Battering Tropical Depression Iggy
Image by NASA Goddard Photo and Video
NASA satellites have watched as wind shear has torn Cyclone Iggy apart over the last day. NASA infrared satellite imagery showed that Iggy’s strongest thunderstorms have been pushed away from the storm’s center and visible imagery shows the storm is being stretched out. Iggy is weakening and heading for a landfall between Geraldton and Perth.
When NASA’s Aqua satellite passed over Tropical Cyclone Iggy on Feb. 1 at 1805 UTC (1:05 p.m. EST), the Atmospheric Infrared Sounder (AIRS) instrument aboard captured an infrared look at the cyclone. AIRS data showed that the strongest thunderstorms (with the coldest cloud top temperatures) had been pushed to the southeast of Iggy’s center. That convection was pushed by vertical wind shear from the northwest. Once convection is pushed away from a tropical cyclone’s center, the storm begins to fall apart. Tropical cyclones must be stacked in the atmosphere like a haystack. If the middle (convection in this case) gets pushed out, then the storm collapses.
The Moderate Resolution Imaging Spectroradiometer (MODIS) instrument aboard NASA’s Aqua satellite captured a true color image of Iggy when it passed overhead on Feb. 2, 2012 at 0615 UTC (1:15 a.m. EST). The MODIS image clearly shows how the wind shear is affecting the tropical depression because Iggy appears elongated from northwest to southeast, which is the direction of the wind shear.
The Australian Bureau of Meteorology (ABM) issued severe weather warnings for residents from Kalbarri to Morawa, and from Morawa to Wongan Hills; and Wongan to Narrogin and Harvey. The ABM website noted that the warning includes people in, near or between the following towns: Geraldton, Jurien Bay, Perth, Mandurah, York and Narrogin. Those areas can expect thunderstorms with heavy rainfall, and gusty winds as Iggy continues moving east. Flash flooding is also a possibility from the heavy rainfall.
On February 2, 2012, Tropical Depression Iggy had maximum sustained winds near 30 knots (~35 mph/~56 kph). It was located about 170 nautical miles (~196 miles/~315 km) northwest of Perth, Western Australia, and its center was near 29.9 South latitude and 114.2 East longitude. Iggy was moving to the east at 14 knots (16 mph/~26 kph) and is expected to continue in that direction making landfall before 0300 UTC on February 3, 2012 (or before 10 p.m. EST, Feb. 3). Iggy is expected to quickly weaken to a remnant low as it moves further inland in Western Australia.
Credit: NASA/GSFC/Jeff Schmaltz/MODIS Land Rapid Response Team
Text Credit: Rob Gutro
NASA’s Goddard Space Flight Center, Greenbelt, Md.
NASA Goddard Space Flight Center enables NASA’s mission through four scientific endeavors: Earth Science, Heliophysics, Solar System Exploration, and Astrophysics. Goddard plays a leading role in NASA’s accomplishments by contributing compelling scientific knowledge to advance the Agency’s mission.
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NASA Sees More Severe Weather Over Eastern Texas, Oklahoma
Image by NASA Goddard Photo and Video
The AIRS instrument onboard NASA’s Aqua satellite captured an infrared image that showed cloud top temperatures in the severe frontal system over Texas and Oklahoma on March 20 at 0753 UTC 34:53 a.m. EST). The strongest thunderstorms, heaviest rainfall and coldest cloud top temperatures (around 220 Kelvin/ -63.6 F/-53.1 C) appear in purple.
Credit: NASA/JPL, Ed Olsen
A low pressure area is centered over eastern Oklahoma, and its associated cold front drapes south into eastern Texas. The front is stalled over eastern Texas and eastern Oklahoma and is generating severe weather today. NASA’s Aqua satellite and NOAA’s GOES-13 satellite have been providing infrared, visible and microwave images to forecasters of the stalled frontal system.
On March 20, a flood warning was in effect up and down the eastern sides of Texas and Oklahoma, including Dallas and Fort Worth, Texas. The National Weather Service posted a flood warning for the double cities because of heavy rainfall over the last 36 hours. More isolated thunderstorms are expected to develop late afternoon and evening, generating more heavy rainfall, lightning and small hail.
When NASA’s Aqua satellite flew over the low pressure area on March 20 at 0753 UTC 34:53 a.m. EST), the Atmospheric Infrared Sounder (AIRS) instrument onboard captured an infrared image that showed cloud top temperatures in the frontal system. The strongest thunderstorms, heaviest rainfall and coldest cloud top temperatures (around 220 Kelvin/ -63.6 F/-53.1 C) appeared as a giant wedge over the region.
NASA’s Goddard Space Flight Center in Greenbelt, Md. uses data from the National Oceanic and Atmospheric Administration’s (NOAA’s) GOES-13 satellite’s and creates images and animations. NOAA’s GOES-13 satellite captured a visible image of the clouds associated with the stalled front over eastern Texas and Oklahoma on March 20, 2012 at 1731 UTC (1:31 p.m. EDT). Ironically, the clouds look almost like a giant funnel.
Rob Gutro
NASA’s Goddard Space Flight Center
NASA Goddard Space Flight Center enables NASA’s mission through four scientific endeavors: Earth Science, Heliophysics, Solar System Exploration, and Astrophysics. Goddard plays a leading role in NASA’s accomplishments by contributing compelling scientific knowledge to advance the Agency’s mission.
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There is some weather on the way! (2)
Image by tdaonp67