Warning Research News

12345...Last »
Tornado in Wyoming

Record low estimated tornado counts from May 2012 to April 2013

Friday, May 3rd, 2013  ·  Posted in Warning Research News

NSSL tornado climatology expert, Harold Brooks has written a blog post about the remarkable absence of tornado activity during the 12-month period from May 2012 to April 2013.

Tags: , , , ,

Researchers and forecasters talk Warn-on-Forecast

Warn-on-Forecast Week!

Wednesday, January 30th, 2013  ·  Posted in Warning Research News

February 5-7 at the National Weather Center.

Tags: , , ,

1334

CI-FLOW total water level system prepared for test by Hurricane Sandy

Friday, October 26th, 2012  ·  Posted in Warning Research News

Researchers with the Coastal and Inland Flooding Observation and Warning (CI-FLOW; http://nssl.noaa.gov/ciflow) project are preparing for Hurricane Sandy to test their total water level system in North Carolina this weekend.

Tags: , , , , ,

GOES-14 image from August 16, 2012

Super Rapid Scan Experiment combines satellite, radar and lightning observations

Friday, August 17th, 2012  ·  Posted in Warning Research News

As storms moved across Oklahoma yesterday, the GOES-14 satellite, Multi-function Phased Array Radar (MPAR) and the Oklahoma Lightning Mapping Array (OK-LMA) coordinated data collection for the first time as part of the Super Rapid Scan Experiment.

Tags: , , , ,

The Oklahoma Lightning Mapping Array can map up to twelve thousand points per second, and so can reveal where a flash originates and how it develops in a storm. An example of a flash is shown in this figure. The top two panels show altitude as a function of time. The second of these is a more expanded view, from 20:00.6 - 20:02.2 UT (a period of 1 minute 36 seconds). Color coding indicates elapsed time, with purple being earliest and red being latest. The bottom left panel shows the view one would have from above the storm. The panel just above it shows the view from the south. The lower-right panel shows the view, rotated on its side, one would see from the west. The tics in these three panels are labeled in kilometers from the center of the lightning mapping array, so the east and north dimensions are each 120 km. This flash is longer-lasting and somewhat larger than "typical" lightning flashes. It spans roughly 80 km (50 miles) in the east-west direction. Note how the flash structure extends outward from the dark blue region in which the flash began. This case also shows the classic bi-level structure of flashes. In this case, as in the majority of flashes, lightning channels in the upper layer (well, ok, the layer tilts downward to the west) propagate through positive charge, and channels in the lower layer propagate through negative charge. This bi-level lightning structure results because most storms tend to have a large region of positive charge above a large region of negative charge.

Oklahoma lightning mapping array now expanded

Monday, May 21st, 2012  ·  Posted in Warning Research News

NSSL’s Field Observing Facilities Support (FOFS) team just finished installing seven new lightning mapping stations in the Oklahoma Lightning Mapping Array (OKLMA).

Tags: , , , ,

12345...Last »