Alert archive / Mississippi / Special Weather Statements in 2012

Special Weather Statement, NWS Memphis, TN

July 21, 2012Tunica County, Mississippi

NWS Memphis, TN issued this special weather statement at Jul 21, 2012, 1:55 PM CDT for Tunica County, Mississippi. It was in force for 35 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 21, 2012, 1:55 PM CDT (18:55 UTC)
Expired: Jul 21, 2012, 2:30 PM CDT
In force: 35 min
Issued by: NWS Memphis, TN

County Tunica County, MS

The radar

The Memphis radar (KNQA), 89 km from the middle of the area, began a volume at 18:58 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 12:00Z, 6.9 hours before the alert went out and 47 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: 947 J/kg
Mixed-layer CIN: -161 J/kg
Mixed-layer LCL: 1082 m above ground
0-6 km bulk shear: 3 kt
0-1 km storm-relative helicity: -27 m²/s²
0-3 km storm-relative helicity: 80 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.5

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Jul 21, 12:53 PM CDT, 1 hour 2 minutes earlier.

Area forecast discussion, Jul 21, 12:53 PM CDT, 1 hour 2 minutes before

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Hazardous weather outlook, Jul 21, 9:33 AM CDT, 4 hours 22 minutes before

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In the hours before

Special weather statement, Jul 21, 1:55 PM CDT, 0 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 20, 7:06 PM CDT	Special Weather Statement	MEG	Tate	24 min
Jul 20, 8:22 PM CDT	Special Weather Statement	MEG	Lafayette	53 min
Jul 20, 8:36 PM CDT	Severe Thunderstorm Warning	MEG	Calhoun, Lafayette, Yalobusha	39 min
Jul 20, 10:34 PM CDT	Severe Thunderstorm Warning	MEG	Lee, Pontotoc, Union	41 min
Jul 21, 1:41 AM CDT	Special Weather Statement	MEG	Pontotoc	34 min
Jul 21, 2:29 AM CDT	Special Weather Statement	MEG	Monroe	31 min
Jul 21, 3:01 PM CDT	Special Weather Statement	MEG	DeSoto	29 min
Jul 21, 3:04 PM CDT	Heat Advisory	MEG	Alcorn, Benton, Calhoun, Chickasaw, Coahoma, DeSoto and 16 more	5 days
Jul 21, 2:57 PM CDT	Special Weather Statement	MEG	Hardin	33 min
Jul 21, 2:58 PM CDT	Special Weather Statement	MEG	Phillips	32 min

Nearby

Special Weather Statements in Mississippi, 2012 Every special weather statement 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.