Alert archive / Arkansas / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 337, NWS Memphis, TN

July 12, 2010Lee County, St. Francis County, Arkansas

NWS Memphis, TN issued this severe thunderstorm warning at Jul 12, 2010, 6:35 PM CDT for Lee County, St. Francis County, Arkansas. It was in force for 40 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: Jul 12, 2010, 6:35 PM CDT (23:35 UTC)
Expired: Jul 12, 2010, 7:15 PM CDT
In force: 40 min
Issued by: NWS Memphis, TN
Area: Storm-based polygon

Counties Lee County, AR, St. Francis County, AR

The radar

The Memphis radar (KNQA), 95 km from the middle of the area, began a volume at 23:36 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
Jul 12, 2:48 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Little Rock, AR (KLZK), launched 12:00Z, 11.6 hours before the alert went out and 75 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: 1840 J/kg
Mixed-layer CIN: -76 J/kg
Mixed-layer LCL: 956 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 102 m²/s²
0-3 km storm-relative helicity: 112 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 3.5

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 Memphis, TN wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 12, 3:34 PM CDT, 3 hours 1 minute earlier.

Area forecast discussion, Jul 12, 3:34 PM CDT, 3 hours 1 minute before

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Hazardous weather outlook, Jul 12, 3:59 PM CDT, 2 hours 36 minutes before

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In the hours before

Special weather statement, Jul 12, 4:12 PM CDT, 2 hours 23 minutes before

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Special weather statement, Jul 12, 4:22 PM CDT, 2 hours 13 minutes before

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Local storm report, Jul 12, 4:31 PM CDT, 2 hours 4 minutes before

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Special weather statement, Jul 12, 4:36 PM CDT, 1 hour 59 minutes before

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Special weather statement, Jul 12, 5:22 PM CDT, 1 hour 13 minutes before

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Special weather statement, Jul 12, 5:44 PM CDT, 51 minutes before

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The office that day

Everything else NWS Memphis, TN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 11, 8:13 PM CDT	Flash Flood Warning	MEG	Carroll, Gibson, Henry, Weakley	2 hr
Jul 12, 2:47 AM CDT	Flash Flood Warning	MEG	Shelby	3 hr
Jul 12, 3:42 AM CDT	Flash Flood Warning	MEG	Shelby	3 hr
Jul 12, 4:21 AM CDT	Flash Flood Watch	MEG	Carroll, Chester, Crockett, Decatur, Dyer, Fayette and 14 more	30 hr
Jul 12, 5:39 AM CDT	Flash Flood Warning	MEG	Shelby, Tipton	3 hr
Jul 12, 6:36 AM CDT	Flash Flood Warning	MEG	Shelby	84 min
Jul 12, 7:54 AM CDT	Flash Flood Warning	MEG	Shelby	2 hr
Jul 12, 8:45 AM CDT	Flash Flood Warning	MEG	Shelby, Tipton	60 min
Jul 12, 8:51 AM CDT	Flash Flood Warning	MEG	Fayette, Hardeman, Shelby	114 min
Jul 12, 4:16 PM CDT	Areal Flood Advisory	MEG	Tipton	3 hr
Jul 12, 4:17 PM CDT	Severe Thunderstorm Warning	MEG	Crockett, Haywood, Lauderdale, Madison, Tipton	43 min
Jul 12, 4:46 PM CDT	Severe Thunderstorm Warning	MEG	Fayette, Haywood, Shelby, Tipton	24 min
Jul 12, 5:52 PM CDT	Severe Thunderstorm Warning	MEG	Chester, Decatur, Henderson, Madison	38 min
Jul 11, 8:55 PM CDT	Severe Thunderstorm Warning	MEG	Greene, Lawrence, Randolph	34 min
Jul 11, 9:20 PM CDT	Flash Flood Warning	MEG	Clay, Greene, Lawrence, Randolph	3 hr
Jul 11, 10:15 PM CDT	Flash Flood Warning	MEG	Craighead, Greene, Mississippi	117 min
Jul 11, 10:22 PM CDT	Flash Flood Warning	MEG	Lawrence, Randolph	113 min
Jul 12, 1:40 AM CDT	Flash Flood Warning	MEG	Cross, Poinsett	5 hr
Jul 12, 3:52 AM CDT	Flash Flood Warning	MEG	Greene, Lawrence, Randolph	3 hr
Jul 12, 2:24 PM CDT	Severe Thunderstorm Warning	MEG	Craighead, Greene, Lawrence, Poinsett	51 min
Jul 12, 3:18 PM CDT	Severe Thunderstorm Warning	MEG	Clay, Craighead, Greene, Mississippi	30 min
Jul 12, 4:55 PM CDT	Severe Thunderstorm Warning	MEG	Lawrence	25 min
Jul 12, 4:57 PM CDT	Flash Flood Warning	MEG	Lawrence, Randolph	2 hr
Jul 12, 6:42 PM CDT	Severe Thunderstorm Warning	MEG	Cross, Poinsett	48 min

Nearby

Severe Thunderstorm Warnings in Arkansas, 2010 Every severe thunderstorm warning in 2010

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.