Alert archive / Tennessee / Flash Flood Watches in 2013

Flash Flood Watch 5, NWS Memphis, TN

May 31, 201318 counties in Tennessee; DeSoto County, Mississippi; 11 counties in Arkansas

NWS Memphis, TN issued this flash flood watch at May 31, 2013, 3:44 PM CDT for 18 counties in Tennessee; DeSoto County, Mississippi; 11 counties in Arkansas. It took effect at Jun 1, 2013, 4:00 AM CDT. It was in force for 11 hr.

The area

The counties it named.

The facts

Issued: May 31, 2013, 3:44 PM CDT (20:44 UTC)
In effect from: Jun 1, 2013, 4:00 AM CDT
Expired: Jun 1, 2013, 2:58 PM CDT
In force: 11 hr
Issued by: NWS Memphis, TN
Flood severity: None

All 30 counties

Clay County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Greene County, AR, Lawrence County, AR, Lee County, AR, Mississippi County, AR, Poinsett County, AR, Randolph County, AR, St. Francis County, AR, DeSoto County, MS, Carroll County, TN, Chester County, TN, Crockett County, TN, Decatur County, TN, Dyer County, TN, Fayette County, TN, Gibson County, TN, Hardeman County, TN, Haywood County, TN, Henderson County, TN, Henry County, TN, Lake County, TN, Lauderdale County, TN, Madison County, TN, Obion County, TN, Shelby County, TN, Tipton County, TN, Weakley County, TN

The radar

The Memphis radar (KNQA), 45 km from the middle of the area, began a volume at 20:47 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

Nashville Metro, TN (KBNA), launched 12:00Z, 8.7 hours before the alert went out and 279 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: 470 J/kg
Mixed-layer CIN: -48 J/kg
Mixed-layer LCL: 883 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 105 m²/s²
0-3 km storm-relative helicity: 151 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood watch 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 flash flood watch went out at May 31, 12:52 PM CDT, 2 hours 52 minutes earlier.

Area forecast discussion, May 31, 12:52 PM CDT, 2 hours 52 minutes before

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Hazardous weather outlook, May 31, 1:04 PM CDT, 2 hours 40 minutes before

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In the hours before

Local storm report, May 31, 10:11 AM CDT, 5 hours 33 minutes before

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Local storm report, May 31, 11:38 AM CDT, 4 hours 6 minutes before

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Local storm report, May 31, 1:28 PM CDT, 2 hours 16 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
May 30, 7:10 PM CDT	Severe Thunderstorm Warning	MEG	Carroll, Crockett, Gibson, Madison, Weakley	35 min
May 30, 7:32 PM CDT	Severe Thunderstorm Warning	MEG	Carroll, Gibson, Henry, Obion, Weakley	58 min
May 31, 5:32 AM CDT	Severe Thunderstorm Warning	MEG	Lauderdale, Tipton	43 min
May 31, 6:59 AM CDT	Areal Flood Advisory	MEG	Shelby	3 hr
May 30, 7:23 PM CDT	Special Weather Statement	MEG	Phillips	52 min
May 30, 7:35 PM CDT	Special Weather Statement	MEG	Clay, Greene	40 min
May 30, 7:42 PM CDT	Special Weather Statement	MEG	St. Francis	33 min
May 30, 8:22 PM CDT	Special Weather Statement	MEG	Cross	38 min
May 31, 12:08 AM CDT	Severe Thunderstorm Warning	MEG	Crittenden, Lee, St. Francis	37 min
May 31, 12:39 AM CDT	Severe Thunderstorm Warning	MEG	Lee, St. Francis	51 min
May 31, 12:49 AM CDT	Tornado Warning	MEG	Lee, St. Francis	26 min
May 31, 4:05 AM CDT	Flash Flood Watch	MEG	Clay, Craighead, Crittenden, Cross, Greene, Lawrence and 4 more	3 hr
May 31, 4:05 AM CDT	Flash Flood Warning	MEG	Cross, Poinsett	4 hr
May 31, 5:10 AM CDT	Flash Flood Warning	MEG	Crittenden, Cross, Poinsett	4 hr

Nearby

Flash Flood Watches in Tennessee, 2013 Flash Flood Watches in Arkansas, 2013 Flash Flood Watches in Mississippi, 2013 Every flash flood watch in 2013

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.