Alert archive / Mississippi / Heat Advisories in 2012

Heat Advisory 15, NWS Memphis, TN

September 7, 201211 counties in Mississippi; 4 counties in Tennessee; 8 counties in Arkansas

NWS Memphis, TN issued this heat advisory at Sep 7, 2012, 3:22 AM CDT for 11 counties in Mississippi; 4 counties in Tennessee; 8 counties in Arkansas. It took effect at Sep 7, 2012, 11:00 AM CDT. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued: Sep 7, 2012, 3:22 AM CDT (08:22 UTC)
In effect from: Sep 7, 2012, 11:00 AM CDT
Expired: Sep 7, 2012, 7:00 PM CDT
In force: 8 hr
Issued by: NWS Memphis, TN

All 23 counties

Craighead County, AR, Crittenden County, AR, Cross County, AR, Lee County, AR, Mississippi County, AR, Phillips County, AR, Poinsett County, AR, St. Francis County, AR, Calhoun County, MS, Coahoma County, MS, DeSoto County, MS, Lafayette County, MS, Marshall County, MS, Panola County, MS, Quitman County, MS, Tallahatchie County, MS, Tate County, MS, Tunica County, MS, Yalobusha County, MS, Fayette County, TN, Lauderdale County, TN, Shelby County, TN, Tipton County, TN

The radar

The Memphis radar (KNQA), 59 km from the middle of the area, began a volume at 08:24 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 nearest sounding before it

Little Rock, AR (KLZK), launched 00:00Z, 8.4 hours before the alert went out and 16 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: 3100 J/kg
Mixed-layer CIN: -37 J/kg
Mixed-layer LCL: 1404 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: 15 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.5

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this heat advisory 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 heat advisory went out at Sep 7, 3:18 AM CDT, 4 minutes earlier.

Area forecast discussion, Sep 7, 3:18 AM CDT, 4 minutes before

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Hazardous weather outlook, Sep 6, 10:47 PM CDT, 4 hours 35 minutes before

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In the hours before

Special weather statement, Sep 6, 9:46 PM CDT, 5 hours 36 minutes before

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Special weather statement, Sep 6, 10:13 PM CDT, 5 hours 9 minutes before

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Local storm report, Sep 6, 11:00 PM CDT, 4 hours 22 minutes before

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Local storm report, Sep 6, 11:10 PM CDT, 4 hours 12 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
Sep 6, 7:48 PM CDT	Special Weather Statement	MEG	Tunica	27 min
Sep 6, 8:14 PM CDT	Special Weather Statement	MEG	DeSoto	31 min
Sep 6, 8:15 PM CDT	Areal Flood Advisory	MEG	DeSoto, Tunica	90 min
Sep 6, 8:44 PM CDT	Special Weather Statement	MEG	DeSoto	31 min
Sep 6, 8:46 PM CDT	Special Weather Statement	MEG	Tunica	29 min
Sep 6, 8:59 PM CDT	Areal Flood Advisory	MEG	DeSoto, Tunica	61 min
Sep 6, 9:11 PM CDT	Special Weather Statement	MEG	DeSoto, Tunica	34 min
Sep 6, 9:14 PM CDT	Severe Thunderstorm Warning	MEG	DeSoto, Tate	31 min
Sep 6, 9:46 PM CDT	Special Weather Statement	MEG	DeSoto, Tate	29 min
Sep 6, 9:47 PM CDT	Flash Flood Warning	MEG	DeSoto	99 min
Sep 6, 10:13 PM CDT	Special Weather Statement	MEG	Lafayette, Panola, Tate	32 min
Sep 6, 7:12 PM CDT	Special Weather Statement	MEG	Henry, Weakley	33 min
Sep 6, 8:21 PM CDT	Special Weather Statement	MEG	Shelby	24 min
Sep 7, 4:34 PM CDT	Severe Thunderstorm Warning	MEG	Lawrence, Randolph	41 min
Sep 7, 5:18 PM CDT	Special Weather Statement	MEG	Lawrence	27 min
Sep 7, 5:54 PM CDT	Severe Thunderstorm Warning	MEG	Craighead, Greene, Lawrence, Randolph	51 min
Sep 7, 6:39 PM CDT	Severe Thunderstorm Warning	MEG	Craighead, Greene, Lawrence, Poinsett	51 min
Sep 7, 6:46 PM CDT	Areal Flood Advisory	MEG	Lawrence	89 min

Nearby

Heat Advisories in Mississippi, 2012 Heat Advisories in Arkansas, 2012 Heat Advisories in Tennessee, 2012 Every heat advisory in 2012

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.