Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 491, NWS Norman, OK

May 28, 2017Garvin County, Murray County, Pontotoc County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at May 28, 2017, 1:57 AM CDT for Garvin County, Murray County, Pontotoc County, Oklahoma. It was in force for 18 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: May 28, 2017, 1:57 AM CDT (06:57 UTC)
Expired: May 28, 2017, 2:15 AM CDT
In force: 18 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 2.0 in
Wind: 60.0 mph

Counties Garvin County, OK, Murray County, OK, Pontotoc County, OK

The radar

The Norman radar (KTLX), 81 km from the middle of the area, began a volume at 07:00 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 27, 4:01 PM CDT	Tornado Watch	SPC	10 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 7.0 hours before the alert went out and 73 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 5174 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 1475 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 91 m²/s²
0-3 km storm-relative helicity: 119 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 8.1

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Norman, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at May 28, 12:35 AM CDT, 1 hour 22 minutes earlier.

Area forecast discussion, May 28, 12:35 AM CDT, 1 hour 22 minutes before

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Hazardous weather outlook, May 28, 1:26 AM CDT, 31 minutes before

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In the hours before

Local storm report, May 28, 12:28 AM CDT, 1 hour 29 minutes before

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Special weather statement, May 28, 12:47 AM CDT, 1 hour 10 minutes before

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Local storm report, May 28, 1:06 AM CDT, 51 minutes before

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Special weather statement, May 28, 1:07 AM CDT, 50 minutes before

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Special weather statement, May 28, 1:27 AM CDT, 30 minutes before

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Local storm report, May 28, 1:54 AM CDT, 3 minutes before

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The office that day

Everything else NWS Norman, OK issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 27, 7:14 PM CDT	Special Weather Statement	OUN	Lincoln	46 min
May 27, 7:19 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Johnston, Murray	56 min
May 27, 7:25 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln	41 min
May 27, 7:28 PM CDT	Special Weather Statement	OUN	Stephens	62 min
May 27, 7:35 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, Pontotoc, Pottawatomie, Seminole	40 min
May 27, 7:36 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton, Stephens	54 min
May 27, 7:41 PM CDT	Severe Thunderstorm Warning	OUN	Johnston, Murray, Pontotoc	49 min
May 27, 7:54 PM CDT	Tornado Warning	OUN	Johnston	36 min
May 27, 8:04 PM CDT	Severe Thunderstorm Warning	OUN	Grady	56 min
May 27, 8:09 PM CDT	Severe Thunderstorm Warning	OUN	Hughes, Pontotoc, Pottawatomie, Seminole	51 min
May 27, 8:12 PM CDT	Severe Thunderstorm Warning	OUN	Atoka, Coal, Johnston	48 min
May 27, 8:22 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, Grady, Stephens	68 min
May 27, 8:29 PM CDT	Severe Thunderstorm Warning	OUN	Coal, Johnston, Pontotoc	24 min
May 27, 8:38 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, McClain	49 min
May 27, 8:43 PM CDT	Severe Thunderstorm Warning	OUN	Pottawatomie, Seminole	48 min
May 27, 8:55 PM CDT	Severe Thunderstorm Warning	OUN	Atoka, Coal	50 min
May 27, 8:55 PM CDT	Tornado Warning	OUN	Carter, Garvin, Murray, Stephens	35 min
May 27, 9:01 PM CDT	Severe Thunderstorm Warning	OUN	Atoka, Coal	44 min
May 27, 9:06 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, McClain, Pontotoc, Pottawatomie, Seminole	24 min
May 27, 9:07 PM CDT	Special Weather Statement	OUN	Okfuskee	38 min
May 27, 9:11 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, McClain, Pottawatomie	40 min
May 27, 9:20 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, Stephens	40 min
May 27, 9:24 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Pottawatomie, Seminole	51 min
May 27, 9:24 PM CDT	Tornado Warning	OUN	Carter, Garvin, Murray	36 min
May 27, 9:28 PM CDT	Severe Thunderstorm Warning	OUN	McClain, Pontotoc, Pottawatomie, Seminole	47 min
May 27, 9:37 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, Murray	68 min
May 27, 9:40 PM CDT	Severe Thunderstorm Warning	OUN	Atoka, Coal	55 min
May 27, 9:46 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Garvin, Murray, Stephens	59 min
May 27, 9:47 PM CDT	Areal Flood Advisory	OUN	Carter, Garvin, Johnston, Murray, Stephens	3 hr
May 27, 9:47 PM CDT	Tornado Warning	OUN	Murray	28 min
May 27, 9:49 PM CDT	Special Weather Statement	OUN	Hughes, Pottawatomie, Seminole	56 min
May 27, 9:53 PM CDT	Severe Thunderstorm Warning	OUN	Ellis, Harper	52 min
May 27, 10:09 PM CDT	Flash Flood Warning	OUN	Carter, Garvin, Johnston, Murray, Pontotoc, Stephens	4 hr
May 27, 10:09 PM CDT	Tornado Warning	OUN	Carter, Murray	36 min
May 27, 10:13 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Pottawatomie, Seminole	47 min
May 27, 10:16 PM CDT	Flash Flood Warning	OUN	Atoka, Coal	4 hr
May 27, 10:22 PM CDT	Flash Flood Warning	OUN	Lincoln, Pottawatomie	4 hr
May 27, 10:24 PM CDT	Severe Thunderstorm Warning	OUN	Coal, Johnston, Murray, Pontotoc	66 min
May 27, 10:26 PM CDT	Special Weather Statement	OUN	Stephens	34 min
May 27, 10:26 PM CDT	Severe Thunderstorm Warning	OUN	Dewey, Ellis, Major, Woodward	49 min
May 27, 10:32 PM CDT	Tornado Warning	OUN	Carter, Johnston, Murray	43 min
May 27, 10:39 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Garvin, Jefferson, Johnston, Murray, Stephens	51 min
May 27, 10:50 PM CDT	Severe Thunderstorm Warning	OUN	Atoka, Coal, Hughes, Johnston, Pontotoc	70 min
May 27, 11:04 PM CDT	Tornado Warning	OUN	Jefferson, Stephens	26 min
May 27, 11:14 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Dewey, Harper, Major, Woods, Woodward	46 min
May 27, 11:17 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Coal, Cotton, Garvin, Jefferson, Johnston and 3 more	73 min
May 27, 11:24 PM CDT	Tornado Warning	OUN	Carter, Jefferson	36 min
May 27, 11:46 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Blaine, Garfield, Kingfisher, Major, Woods	44 min
May 27, 11:48 PM CDT	Tornado Warning	OUN	Carter	27 min
May 27, 11:50 PM CDT	Flash Flood Warning	OUN	Atoka, Coal, Johnston, Pontotoc	4 hr
May 28, 12:09 AM CDT	Severe Thunderstorm Warning	OUN	Carter, Jefferson, Love	81 min
May 28, 12:13 AM CDT	Flash Flood Warning	OUN	Carter, Jefferson, Stephens	5 hr
May 28, 12:18 AM CDT	Tornado Warning	OUN	Jefferson, Love	27 min
May 28, 12:19 AM CDT	Severe Thunderstorm Warning	OUN	Garfield, Kingfisher, Major	26 min
May 28, 12:25 AM CDT	Severe Thunderstorm Warning	OUN	Atoka, Bryan, Carter, Coal, Johnston, Love and 1 more	65 min
May 28, 12:39 AM CDT	Tornado Warning	OUN	Love	36 min
May 28, 12:47 AM CDT	Special Weather Statement	OUN	Garfield, Kingfisher	28 min
May 28, 1:04 AM CDT	Severe Thunderstorm Warning	OUN	Bryan, Love, Marshall	56 min
May 28, 1:07 AM CDT	Special Weather Statement	OUN	McClain	23 min
May 28, 1:10 AM CDT	Areal Flood Advisory	OUN	Carter, Jefferson, Love	4 hr
May 28, 1:15 AM CDT	Severe Thunderstorm Warning	OUN	Garvin, McClain	45 min
May 28, 1:27 AM CDT	Special Weather Statement	OUN	Pottawatomie	33 min
May 28, 1:58 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Garvin, McClain, Pottawatomie	32 min
May 28, 2:09 AM CDT	Special Weather Statement	OUN	Bryan	36 min
May 28, 3:51 AM CDT	Special Weather Statement	OUN	Love	24 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2017 Every severe thunderstorm warning in 2017

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.