Alert archive / Tennessee / Special Weather Statements in 2018

Special Weather Statement, NWS Memphis, TN

July 19, 2018Chester County, Tennessee

NWS Memphis, TN issued this special weather statement at Jul 19, 2018, 3:03 PM CDT for Chester County, Tennessee. It was in force for 42 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 19, 2018, 3:03 PM CDT (20:03 UTC)
Expired: Jul 19, 2018, 3:45 PM CDT
In force: 42 min
Issued by: NWS Memphis, TN

County Chester County, TN

The radar

The Memphis radar (KNQA), 112 km from the middle of the area, began a volume at 20:07 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 (KBYH), launched 12:00Z, 8.1 hours before the alert went out and 138 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: 1508 J/kg
Mixed-layer CIN: -86 J/kg
Mixed-layer LCL: 876 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 112 m²/s²
0-3 km storm-relative helicity: 181 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 3.6

Open this sounding in Storm Lab

The text

As transmitted.

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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 19, 12:49 PM CDT, 2 hours 14 minutes earlier.

Area forecast discussion, Jul 19, 12:49 PM CDT, 2 hours 14 minutes before

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Hazardous weather outlook, Jul 19, 12:47 PM CDT, 2 hours 16 minutes before

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In the hours before

Special weather statement, Jul 19, 3:03 PM CDT, 0 minutes before

Special Weather Statement
National Weather Service Memphis TN
303 PM CDT THU JUL 19 2018

TNZ052-053-091-192045-
Chester TN-Madison TN-McNairy TN-
303 PM CDT THU JUL 19 2018

...A SIGNIFICANT WEATHER ADVISORY HAS BEEN ISSUED UNTIL 345 PM CDT
FOR...

Chester County in southwestern Tennessee...
Southeastern Madison County in southwestern Tennessee...
Northeastern McNairy County in southwestern Tennessee...

At 302 PM CDT...a strong thunderstorm producing pea size hail or
larger and winds at least 40 mph was located near Chickasaw State
Park, moving east at 10 mph.

Very heavy rain along with continuous cloud to ground lightning are
also possible with this thunderstorm.

People in Chester...southeastern Madison and northeastern McNairy
Counties should monitor this storm closely.

LAT...LON 3532 8843 3530 8879 3532 8880 3533 8879
      3534 8880 3553 8886 3559 8861 3558 8861
      3559 8860 3559 8857 3554 8854 3551 8849
TIME...MOT...LOC 2002Z 254DEG 8KT 3543 8875

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 19, 3:15 AM CDT	Heat Advisory	MEG	Shelby, Tipton	17 hr
Jul 19, 3:42 PM CDT	Heat Advisory	MEG	Benton, Carroll, Chester, Crockett, Decatur, Dyer and 15 more	28 hr
Jul 19, 6:12 PM CDT	Special Weather Statement	MEG	Obion	48 min
Jul 19, 6:23 PM CDT	Severe Thunderstorm Warning	MEG	Obion, Weakley	40 min
Jul 19, 5:52 AM CDT	Special Weather Statement	MEG	Chickasaw	53 min
Jul 19, 6:03 AM CDT	Severe Thunderstorm Warning	MEG	Chickasaw, Lee, Monroe, Pontotoc	21 min
Jul 19, 7:15 AM CDT	Flash Flood Warning	MEG	Itawamba, Lee, Monroe	2 hr

Nearby

Special Weather Statements in Tennessee, 2018 Every special weather statement in 2018

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.