Alert archive / Arkansas / Flash Flood Watches in 2015

Flash Flood Watch 4, NWS Memphis, TN

May 10, 201512 counties in Arkansas

NWS Memphis, TN issued this flash flood watch at May 10, 2015, 4:33 AM CDT for 12 counties in Arkansas. It took effect at May 10, 2015, 7:00 AM CDT. It was in force for 29 hr.

The area

The counties it named.

The facts

Issued: May 10, 2015, 4:33 AM CDT (09:33 UTC)
In effect from: May 10, 2015, 7:00 AM CDT
Expired: May 11, 2015, 11:41 AM CDT
In force: 29 hr
Issued by: NWS Memphis, TN
Flood severity: None

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, Phillips County, AR, Poinsett County, AR, Randolph County, AR, St. Francis County, AR

The radar

The Memphis radar (KNQA), 75 km from the middle of the area, began a volume at 09:34 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

Springfield, MO (KSGF), launched 00:00Z, 9.6 hours before the alert went out and 318 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: 81 J/kg
Mixed-layer CIN: -90 J/kg
Mixed-layer LCL: 881 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 73 m²/s²
0-3 km storm-relative helicity: 112 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 10, 4:16 AM CDT, 17 minutes earlier.

Area forecast discussion, May 10, 4:16 AM CDT, 17 minutes before

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In the hours before

Special weather statement, May 10, 4:07 AM CDT, 26 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 10, 4:07 AM CDT	Special Weather Statement	MEG	Craighead, Greene, Poinsett	53 min
May 10, 4:57 AM CDT	Special Weather Statement	MEG	Mississippi	33 min
May 10, 5:34 AM CDT	Special Weather Statement	MEG	Mississippi	41 min
May 10, 5:30 PM CDT	Special Weather Statement	MEG	Greene	30 min
May 10, 5:34 PM CDT	Special Weather Statement	MEG	Greene	26 min

Nearby

Flash Flood Watches in Arkansas, 2015 Every flash flood watch in 2015

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.