Saturday, October 20 Wind Event

Widespread Gusts of +40 mph Occurred with +60 mph Gusts in Some of the Convective Showers

Posted: Oct. 20, 2018 8:46 PM
Updated: Oct. 20, 2018 10:20 PM

It has been an interesting day!  From a sunny, mild morning to midday, to building cumulus clouds with convective, low-topped showers with some graupal & even partial virga (part of the rainfalldrying up on the way down) to howling winds & convective gusts +60 mph in places (amidst already strong general winds of 40-50 mph).  Then the cold arrived quickly & with some rain & snow showers in places.

There are multiple reports of trees & powerlines down in parts of the viewing area. Reports have been received from Benton, Newton, Tippecanoe, White, Clinton & Fountain counties.

My hoophouse greenhouse was destroyed & our heavy 100 lb. grill pushed & thrust 100'.  Some surrounding homes to ours had some strips of siding removed by the wind.  During the peak gusts, the air was filled with dust with pieces of corn leaves from fields several miles away blowing in......all while it sprinkled a bit.  It felt like some one opened a refridgerator when in these peak gusts as the turbulent, rain-chilled, dry air hit the ground.  I estimate a wind gust here at the house of 65 mph.

Reported wind gusts in the viewing area (E = Estimated by spotter, M = Measured by anemometer at proper height on proper site.)

Farmers provide a good base of our observations with their properly-sited weather stations.  All stations from farmers with the sensors on their farmers in blue.  A BIG thanks to you all for your vital data!

3 W means 3 miles west of West Lafayette.......this is what the numbers & letters mean.

E65 mph.    3 W West Lafayette

E65 mph.    2 S Lafayette

M64 mph.    Purdue University Airport

M60 mph.    3 NW Mulberry

E60 mph.    1 SW West Lafayette

E60 mph.    Oxford

M58 mph.    Near Veteran's Memorial/U.S. Intersection (Lafayette-Swift Fuels Warehouse)

M56 mph.    3 E Camden

M56 mph.    Frankfort Municipal Airport

M54 mph.    5 ESE Earl Park

M51 mph.    1 WNW Galveston Airport (Cass County)

M51 mph.    4 NE New Richmond

M51 mph.    Crawfordsville Municipal Airport

M50 mph.    3 NE Brookston

M50 mph.    Just N of IN 18 Between Round Grove & Barce

M50 mph.   6 NE Monon

M49 mph.    Danville-Vermillion County Airport

M48 mph.    3 SW West Point (Tippecanoe)

M48 mph.    Grissom Air Reserve Base

M47 mph.    3 E Fowler

M47 mph.    Monticello-White County Airport

M47 mph.    Rensselaer-Jasper County Airport

M46 mph.   3 WSW Round Grove (White)

M46 mph.    5 SE Linden

M45 mph.    Remington

M45 mph.     Morocco

M45 mph.    1 W Alamo (Montgomery)

M45 mph.    5 SW Ladoga

M45 mph.    8 NE Rensselaer

M44 mph.    Chalmers

M44 mph.    4 NE Ladoga

M42 mph.   Beard (Clinton County)

M41 mph.    Kokomo Muncipal Airport

M40 mph.    Logansport-Cass County Airport

M39 mph.    Rochester-Fulton County Airport

Frankfort Muncipal Airport 15-mintue Observations 12:55 a.m. to 6:15 p.m..........Note the temperature drop from 61 at 2:55 to 42 by 5:35 p.m.

The measured wind speeds & gusts measured at the time are in red. Peak gust is in pink. Note the gust of 56 mph during a nearby light rain shower.  Dew points rose from 21 to 30 as the rain shower passed nearby.

This dry air was key in the really intense gusts as low-topped convective showers with the cold front & strong, cold upper trough rained into the very dry air closer to the surface.  The evaporative cooling only enhanced the downdrafts of the showers that tapped into the already strong wind fields.

These strong wind fields occurred also as low pressure deepened to our northeast & high pressure also approached & strengthened to our northwest.  This may for a funneling of the winds into the area as the pressure gradient tightened. 

20 Oct 6:15 pm 42 26 52 NNW 23G32 10.00 SCT060,BKN075,OVC085 29.15 1019.1 30.07
20 Oct 5:55 pm 43 26 51 NNW 21G36 10.00 BKN075,OVC085 29.13 1018.4 30.05
20 Oct 5:35 pm 42 28 58 NNW 29G43 10.00 OVC085 29.12 1018.1 30.04
20 Oct 5:15 pm 46 30 52 NNW 35G56 10.00 BKN075,OVC085 29.08 1016.5 30.00
20 Oct 4:55 pm 53 21 29 NW 32G49 10.00 BKN075,BKN085 29.02 1014.0 29.94
20 Oct 4:35 pm 54 21 28 WNW 32G44 10.00 SCT075,BKN085 29.00 1013.3 29.92
20 Oct 4:15 pm 55 19 24 WNW 31G40 10.00 BKN075,OVC085 28.99 1012.9 29.91
20 Oct 3:55 pm 56 27 32 NW 30G39 10.00 BKN075,BKN085 28.97 1012.2 29.89
20 Oct 3:35 pm 58 27 30 NW 35G43 10.00 BKN065 28.96 1011.7 29.88
20 Oct 3:15 pm 56 24 29 WNW 33G41 10.00 SCT065,BKN085 28.96 1011.8 29.88
20 Oct 2:55 pm 61 29 29 WNW 36G46 10.00 BKN065,BKN085 28.94 1010.8 29.86
20 Oct 2:35 pm 60 29 32 WNW 33G41 10.00 BKN065,BKN075 28.94 1010.9 29.86
20 Oct 2:15 pm 61 30 32 WNW 35G46 10.00 SCT065,BKN075 28.95 1011.2 29.87
20 Oct 1:55 pm 61 31 33 WNW 37G47 10.00 BKN065 28.95 1011.2 29.87 62 45
20 Oct 1:35 pm 61 30 31 WNW 26G38 10.00 BKN055,BKN070 28.96 1011.5 29.88
20 Oct 1:15 pm 60 34 39 WNW 22G31 10.00 BKN055,BKN070,BKN080 28.97 1012.0 29.89
20 Oct 12:55 pm 61 35 38 WNW 22G26 10.00 SCT055,SCT070

Purdue University Airport Hourly Observations 10:54 a.m. to 7:54 p.m. ...............Note the temperature drop from 58 at 12:54 & 1:54 to 40 by 4:54 p.m. & 38 by 6:54 p.m.!

The measured wind speeds & gusts measured at the time are in red.  Peak gust is in pink at observation times.  Note the gust of 63 mph during that light rain shower.  Peak gust was officially 64 mph at the airport.

Note that dry air with temperature in mid 50s & dew point in lower 20s as shower approached.  The evaporative cooling enhanced the already strong gusts.  The bits of buoyancy (heating from the sunshine with the cold air aloft) also helped to get gusts to +60 mph to the surface.

20 Oct 7:54 pm 37 26 64 29 NW 13G24 10.00 BKN050 29.52 1022.0 30.17 T 59 37
20 Oct 6:54 pm 38 23 54 28 NW 21G32 10.00 SCT060 29.46 1020.0 30.11
20 Oct 5:54 pm 40 25 55 30 NW 20G35 10.00 SCT060 29.41 1018.3 30.06 T
20 Oct 4:54 pm 40 30 67 27 NNW 37G63 10.00 Lt Rain FEW013,BKN085 29.36 1016.5 30.01 T T
20 Oct 3:54 pm 54 23 30 WNW 31G48 10.00 SCT070 29.24 1012.2 29.89
20 Oct 2:54 pm 54 29 38 W 26G40 10.00 FEW070 29.21 1011.2 29.86
20 Oct 1:54 pm 58 33 39 W 32G48 10.00 SCT060 29.19 1010.6 29.84 59 42
20 Oct 12:54 pm 58 36 44 W 20G36 10.00 SCT060 29.23 1011.7 29.88
20 Oct 11:54 am 56 40 55 W 11G25 10.00 CLR 29.25 1012.4 29.90
20 Oct 10:54 am 52 40 63 W 11G23 10.00 CLR 29.27 1013.2 29.92

Article Comments

West Lafayette
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Hi: 36° Lo: 28°
Feels Like: 26°
Kokomo
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Rensselaer
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Logansport
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Low clouds will linger right into tomorrow.
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