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Localized Downburst Winds Near Roscoe April 24th, 2012
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The combination of decaying showers and thunderstorms, along with a very dry air mass above the surface, allowed higher wind speeds aloft to descend in a highly localized manner near Roscoe, in Keith County - on Tuesday evening at around
725 PM MDT (625 PM MDT).
Dry microbursts, produced by high based thunderstorms that generate little surface rainfall, occur in environments characterized by a thermodynamic profile exhibiting an inverted-V thermal and moisture profile, as viewed on a Skew-T log-P thermodynamic diagram. Some radar animations, and examples of the inverted-V profiles will be provided below. Damage photographs taken near Roscoe are also located below.
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Click here for a GR2Analyst radar loop
Radar Loop above, from the evening of April 24th, 2012
Click here for brief animation of atmospheric soundings from North Platte, Nebraska
(provided courtesy of the University of Wyoming)
Atmospheric sounding above, from North Platte valid 7 PM CDT April 24th, 2012
.TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON
.DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE.
..REMARKS..
0725 PM TSTM WND GST 2 S ROSCOE 41.11N 101.60W
04/24/2012 E80.00 MPH KEITH NE EMERGENCY MNGR
*** 1 INJ *** SEMI-TRAILER BLOWN OFF INTERSTATE 80 MILE
MARKER 134. WIND SPEED IS ESTIMATED.
0725 PM TSTM WND GST ROSCOE 41.13N 101.60W
04/24/2012 E80.00 MPH KEITH NE EMERGENCY MNGR
TWO CAR GARAGE COMPLETELY DEMOLISHED AND A 12 INCH
DIAMETER PINE TREE IN THE YARD SNAPPED IN HALF 8 FEET
ABOVE THE GROUND.
0725 PM TSTM WND GST ROSCOE 41.13N 101.60W
04/24/2012 E80.00 MPH KEITH NE EMERGENCY MNGR
TWO POWER POLES WERE BENT OVER AT A 45 DEGREE ANGLES DUE
TO STRAIGHT LINE WINDS.
0728 PM TSTM WND GST 4 E ROSCOE 41.13N 101.52W
04/24/2012 E80.00 MPH KEITH NE EMERGENCY MNGR
*** 1 INJ *** CAR BLOWN OFF INTERSTATE 80 AT MILE MARKER
137 DUE TO STRAIGHT LINE WINDS.
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Preliminary local storm reports above
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by
Steve Carmel |
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