Microburst/windshear warning system

• US 4,996,473 A
• Filed: 05/17/1989
• Issued: 02/26/1991
• Est. Priority Date: 08/18/1986
• Status: Expired due to Term

• Current Assignee: Ralph J. Markson
• Original Assignee: Airborne Research Associates Inc.
• Inventors: Anderson, Bruce E., Markson, Ralph J.
• Primary Examiner(s): Strecker, Gerard R.
• Assistant Examiner(s): Solis, Jose M.
• Application Number:
  US07/353,390
• Time in Patent Office: 650 Days
• Field of Search: 342/460, 342/387, 342/463, 73/170 R, 340/601, 324/72
• US Class Current: 324/72
• CPC Class Codes: G01S 11/02 using radio waves G01S19/00 takes precedence
• CPC Class Codes: G01S 5/0009 Transmission of position information to remote stations involving assistance data G01S5/0236
• CPC Class Codes: G01W 1/08 Adaptations of balloons, missiles, or aircraft for meteorological purposes; Radiosondes transmission of measurements G01D; transmitting circuits H04B; balloons in general B64B; aeroplanes in general B64D; missiles in general F42B15/00
• CPC Class Codes: G01W 1/10 Devices for predicting weather conditions computers per se G06; display devices G09
• CPC Class Codes: G01W 1/16 Measuring atmospheric potential differences, e.g. due to electrical charges in clouds measuring potentiels in general G01R

Abstract

A system for predicting the occurence of microburst/windshear comprising at least one sensor for receiving lightning produced signals, a processor for processing those received signals to produce data and generate a warning when the processed data indicates that a microburst/windshear is about to occur.

Claims

1. A system for predicting the occurrence of microburst/windshear comprising:

a. one or more sensors responsive to signals from a thunderstorm to generate sensor signals;

b. one or more data processors in communication with said sensors for processing the sensor signals to produce data;

c. a warning device responsive to the data produced by one or more of said data processors for warning a user that a microburst/windshear will occur within a defined number of minutes at a location defined by the data, when the data indicate that the lightning rate exceeds a first threshold value, the time rate of lightning increase exceeds a second theshold value and there is a peak in the lightning rate.

2. The system of claim 1 wherein the sensors measure electrostatic potential.

3. The system of claim 1 wherein the sensors detect electromagnetic radiation from the lightning discharge.

4. The system of claim 3 wherein the sensors detect VHF radiation.

5. The system of claim 3 wherein the sensors detect UHF radiation.

6. The system of claim 3 wherein the sensors detect VLF radiation

7. The system of claim 3 wherein the sensors detect visible light radiation.

8. The system of claim 1 wherein the sensors are airborne.

9. The system of claim 1 wherein the system further comprises a communications link between said sensors and said data processors.

10. The system of claim 9 wherein said communications link is part of a radar transponder system.

11. The system of claim 9 wherein the communications link is a dedicated radio channel.

12. The system of claim 1 wherein the sensors are ground based.

13. The system of claim 1 wherein the signals from said thunderstorm are processed by one of said processors in communication with said sensors to generate data prior to said data being transmitted over said communications link to another of said processors which then processes the data to generate a warning.

14. A system for predicting the occurrence of microburst/windshear comprising:

a. one or more sensors for receiving signals produced by lightning and generating sensor signals;

b. one or more processors in communication with said sensors processors for processing said sensor signals and predicting the occurence of a microburst/windshear, said processor comprising

i. a flash location device for determining the rate of lightning flashes, the change in the rate of lightning flashes and the position of the lightning flashes to define a center of activity;

ii. a center of activity location device for determining the direction and speed of a center of activity as determined by the location of the lightning flashes and a wind vector associated with the thunderstorm;

iii. a microburst/windshear analyzing device for predicting the occurence of a microburst/windshear by comparing the rate of lightning flashes and the change in the rate of lightning flashes with its respective threshold value, and searching for the occurence of a peak in the rate of lightning flashes; and

iv. a warning device for warning a user of the impending occurence of a microburst/windshear, when the rate of lightning and the change in the lightning rate exceed its respective threshold and a peak in the lightning rate is detected within a center of activity.

17. The system of claim 14, 15 or 16 wherein the location of said center of activity is defined by the location of a lightning centroid and the area of the center of activity is determined by the radius of a convective cell and the instrumental error associated in the determination of the location of lightning.

15. A system for predicting the occurrence of microburst/windshear comprising:

one or more sensors for receiving signals produced by lightning and generating a sensor signal;

one or more processors in communication with said sensors for processing said sensor signals and predicting the occurrence of a microburst/windshear, said processor adapted to execute;

i. an algorithm to determine the location of a lightning flash relative to a center of activity;

ii. an algorithm to determine the location of the center of activity;

iii. an algorithm to predict the direction and speed of the center of activity;

iv. an algorithm to determine the rate of lightning flashes;

v. an algorithm to determine the change in the rate of lightning flashes;

vi. an algorithm to predict the occurence of a microburst/windshear as determined by the rate, change in rate, and aerial density of lightning flashes; and

vii. an algorithm for displaying the results of the calculations of the algorithm to display the microburst/windshear warning and the predicted location of the microburst/windshear.

16. A system for predicting the occurrence of microburst/windshear comprising:

at least one for receiving signals produced by lightning and producing sensor signals;

a processor incommunication with said sensor for processing said sensor signals and predicting the occurrence of a microburst/windshear, said processor comprising;

i. an apparatus to determine the location of a lightning flash relative to a center of activity;

ii. an apparatus to determine the location of a center of activity;

iii. an apparatus to determine the direction and speed of the center of activity;

iv. an apparatus to determine the rate of lightning flashes;

v. an apparatus to determine the change in the rate of lightning flashes;

vi. an apparatus to predict the occurence of a microburst/windshear as determined by the rate, change in rate, and position of lightning flashes; and

vii. an apparatus for displaying the results of the calculations of the algorithm to display microburst/windshear warning and the predicted location of the microburst/windshear.

18. A method for predicting microburst/windshear hazard comprising the steps of:

receiving signals produced by lightning;

determining the location of the center of activity from said received signals;

determining the direction and speed of said center of activity;

determining the rate of lightning flashes;

determining the change in the rate of lightning flashes;

determining that a microburst/windshear is about to occur when the rate of lightning exceeds a first threshold value, and the change in the rate of lightning exceeds a second threshold value and a peak in the rate of lightning is measured within a given location as defined by the lightning flashes; and

warning the user that a microburst/windshear will occur within a defined number of minutes.