Harvey near the coast of Texas

August 28th, 2017 |

GOES-16 ABI Band 8 (6.19 µm, “Upper Level Water Vapor”, lower left), ABI Band 10 (7.3 µm, “Lower Level Water Vapor”, upper left), ABI Band 13 (10.3 µm, “Clean Window Infrared”, upper right) and ABI Band 5 (1.61 µm, “Snow/Ice Channel”, lower right) from 1542-1857 UTC on 28 August (Click to animate)

GOES-16 data (ABI and GLM) posted on this page are preliminary, non-operational and are undergoing testing

Meandering Tropical Storm Harvey is near the Gulf Coast of Texas during the day on Monday 28 August as shown in the 4-panel Animation above. The Four panels include, clockwise from lower left, Upper Level Water Vapor (6.19 µm), Lower Level Water Vapor (7.3 µm), Clean Window (10.3 µm) and Snow/Ice Channel (1.61 µm) (ABI Bands 8, 10, 13 and 5, respectively). The deepest and strongest convection with Harvey has shifted eastward into Louisiana; dry mid-tropospheric air is apparent in both water vapor infrared images; Convection continues near the center of the storm; onshore low-level flow is apparent in the Snow/Ice channel. Total Precipitable Water computed from Microwave Imagery (at this site), below, shows that abundant moisture remains over southeast Texas and Louisiana.

Morphed Total Precipitable Water for the 24 hours ending 28 August 2017 (Click to enlarge)

GOES-16 Visible Imagery (0.64 µm), below, show the center of Harvey to be just offshore (Click here for the latest National Hurricane Center advisories on Harvey), with moist low-level flow from the Gulf into southeast Texas and southwest Louisiana. Geostationary Lightning Mapper (GLM) observations of Lightning Groups (Events are grouped into Groups, Groups are grouped into Flashes), show scant lightning associated with the center of Harvey. More lightning activity is apparent over southeastern Louisiana (including some apparently spurious signals near Baton Rouge). A similar animation over Infrared Imagery is here.

GOES-16 ABI Visible Imagery (0.64 µm) and GLM Observations of Lightning Groups from 1842-1927 UTC on 28 August (Click to enlarge)

For the latest on Harvey and its dangerous rainfall, consult the National Hurricane Center website, or the CIMSS Tropical Weather Website, or the Hydrologic Prediction Website.

Hurricane Harvey approaches the Texas Gulf Coast

August 25th, 2017 |
GOES-16

GOES-16 Low-Level Water Vapor Infrared (7.3 µm) images, 0217-1347 UTC on 25 August 2017 (click to play animation)

GOES-16 data posted on this page are preliminary, non-operational and are undergoing testing

Low-Level Water Vapor Infrared imagery (7.34 µm) from GOES-16, above, shows Hurricane Harvey developing a distinct eye shortly after sunrise on 25 August 2017 after intermittent appearances of the eye during the night. Harvey is a strong Hurricane at 950 mb (as of 700 AM CDT according to the National Hurricane Center) and is approaching the central Gulf Coast of Texas. Strong upper-level outflow to the north and then east and south is apparent in the Water Vapor animation above, and an absence of dry air near the storm portends no significant weakening before the storm reaches the Coastline. Microwave estimates of Total Precipitable Water, below, from this site, continue to show extreme moisture amounts enveloping the storm.

MIMIC Total Precipitable Water estimates for the 24 hours ending 1300 UTC on 25 August 2017 (Click to enlarge)

Visible imagery, below, from after sunrise on 25 August 2017, show a symmetric storm with a visible eye. The “Cirrus Channel” near-infrared GOES-16 Channel (1.38), bottom, shows the extensive cirrus canopy from the storm covering much of the western Gulf of Mexico and adjacent states.

GOES-16

GOES-16 Visible Images (0.64 µm) images, 1242-1417 UTC on 25 August 2017 (click to play animation)

GOES-16 near-Infrared Images (1.38 µm) image, 1432 UTC on 25 August 2017 (Click to enlarge)

For the latest information on Harvey, consult the pages of the National Hurricane Center, or the CIMSS Tropical Weather Website. In addition to the flooding threat posed from Harveywith multiple days of rain, storm surge at the coast promises considerable inundation.

GOES-16 animation showing Clean Window IR (10.3 µm) and City Lights Background at night, True Color Imagery during the day, 1100-1900 UTC on 25 August 2017 (Click to enlarge)

A toggle between Suomi NPP VIIRS Visible (0.64 µm) and Infrared Window (11.45 µm) images at 1853 UTC , below, provided a detailed view of the hurricane as it continued to near the Texas coast.

Suomi NPP VIIRS Visible (0.64 µm) and Infrared Window (11.45 µm) images (Click to enlarge)

Suomi NPP VIIRS Visible (0.64 µm) and Infrared Window (11.45 µm) images (Click to enlarge)

Hurricane Harvey

August 24th, 2017 |

GOES-16

GOES-16 “Clean Window” Infrared (10.3 µm) images, 0432-1307 UTC on 24 August 2017 [click to play animation]

GOES-16 data posted on this page are preliminary, non-operational and are undergoing testing

Overnight Satellite imagery from GOES-16, above, shows an increase in the size and convective activity with then-Tropical Storm Harvey. Harvey is forecast to make landfall on the Texas Gulf Coast (See the National Hurricane Center website for further details), and conditions favor strengthening. One of the favorable conditions is shown in the animation of Total Precipitable Water, below, from this site. There is abundant moisture surrounding the storm, extending into eastern and southeastern Texas. Flooding rains will likely precede and accompany this storm.

In addition to abundant moisture, Harvey’s projected path takes it over very deep very warm water (Link showing Oceanic Heat Content).

Note: Harvey achieved Hurricane Status at 1 PM CDT on 24 August 2017. Harvey continued to rapidly intensify during the day (ADT | SATCON).

GOES-16

MIMIC Total Precipitable Water, 24-hour animation ending at 1200 UTC 24 August 2017 [click to enlarge]

Harvey is a large storm. The GOES-16 “Cirrus Channel” 1.38 µm imagery, below, shows Harvey’s cirrus canopy covering much of the southwestern Gulf of Mexico. Cirrus from the storm should be visible from the south Texas Gulf Coast this morning.

GOES-16 “Cirrus Channel” (1.38 µm) Imagery, 1307 UTC on 24 August 2017 (Click to enlarge)

Suomi NPP overflew the southern Gulf after midnight on 24 August 2017, and the VIIRS  Day/Night Band Imagery, below, shows a few lightning streaks in the storm that is barely illuminated by airglow. Cloud-top heights computed from VIIRS data (Link) shows a large central dense overcast with heights exceeding 50000 feet. ATMS 88-GHz Imagery at the same time is shown here. Morphed Microwave imagery (from this site) hints at the development of a ragged eye shortly after sunrise on 24 August. (Animation). (A DMSP SSMI 85 GHz still image from near the end of the MIMIC animation is here).

Suomi NPP Day Night Band Visible (0.70 µm) Imagery over Tropical Storm Harvey, 0747 UTC on 24 August 2017 (Click to enlarge)

ATMS 88-GHz Imagery at the same time is shown here. Morphed Microwave imagery (from this site) hints at the development of a ragged eye shortly after sunrise on 24 August. (Animation). An 85 GHz still image from the end of the animation is shown below.

85 GHz Microwave imagery over Tropical Storm Harvey, 1300 UTC on 24 August 2017 (Click to enlarge)

Later in the day, a toggle between 1912 UTC Visible (0.64 µm) and Infrared Window (11.45 µm) Suomi NPP VIIRS images, below, provided a detailed view of the hurricane.

Suomi NPP VIIRS Visible (0.64 µm) and Infrared Window (11.45 µm) images (Click to enlarge)

Suomi NPP VIIRS Visible (0.64 µm) and Infrared Window (11.45 µm) images (Click to enlarge)

For more information on Hurricane Harvey, a storm that people along the Texas Gulf Coast should be monitoring closely, consult the website of the National Hurricane Center, or the CIMSS Tropical Weather Website.

Hurricane Gert

August 15th, 2017 |

GOES-16 imagery (all 16 ABI Bands) from 1912-2132 UTC, 15 August 2017 [click to play animation]

GOES-16 imagery (all 16 ABI Bands) from 1912-2132 UTC, 15 August 2017 [click to play animation]

GOES-16 data posted on this page are preliminary, non-operational and are undergoing testing

Hurricane Gert, a Category-1 storm on the Saffir-Simpson scale, is over the open Atlantic Ocean east of Cape Hatteras. It is close enough to the USA, however, that it is within GOES-16’s CONUS domain where 5-minute sampling is routine. The animation above shows all 16 channels from GOES-16 ABI, every five minutes from 1912-2132 UTC on 15 August 2017. A distinct eye is not apparent in the visible or infrared satellite imagery, but microwave data (from here) suggests an eye is present, at least at times. A comparison of 2035 UTC DMSP-16 SSMIS Microwave (85 GHz) and 2045 UTC GOES-13 Infrared Window (10.7 µm) images can be seen here.

The low-level Water Vapor imagery, below, shows that Gert is south and east of a front along the East Coast. This front should steer the storm to the north and east. Swells from the storm will affect the East Coast however.

GOES-16 imagery Low-Level Water Vapor (7.34 µm) Infrared Imagery from 1832-2137 UTC, 15 August 2017 [click to play animation]

GOES-16 Low-Level Water Vapor (7.34 µm) Infrared Imagery from 1832-2137 UTC, 15 August 2017 [click to play animation]

For more information on Gert, consult the website of the National Hurricane Center, or the CIMSS Tropical Weather Website.

GOES-16 ABI Imagery from the morning of 16 August 2017, below, shows that an eye has appeared in visible and infrared imagery.

GOES-16 imagery (all 16 ABI Bands) from 1117-1337 UTC, 16 August 2017 [click to play animation]

GOES-16 imagery (all 16 ABI Bands) from 1117-1337 UTC, 16 August 2017 [click to play animation]

A closer view using 1-minute interval GOES-16 Mesoscale Sector “Red” Visible (0.64 µm) and “Clean” Infrared Window (10.3 µm) images, below, showed that  the most vigorous areas of deep convection were generally confined to the northern semicircle of the eyewall region — cloud-top infrared brightness temperatures were as cold as -80º C (violet color enhancement) at times.

GOES-16 Visible (0,64 µm, top) and Infrared Window (10.3 µm, bottom) images [click to play MP4 animation]

GOES-16 Visible (0.64 µm, top) and Infrared Window (10.3 µm, bottom) images [click to play MP4 animation]