Alert archive / Texas / Flash Flood Watches in 2015

Flash Flood Watch 9, NWS Amarillo, TX

October 20, 201520 counties in Texas; Beaver County, Cimarron County, Texas County, Oklahoma

NWS Amarillo, TX issued this flash flood watch at Oct 20, 2015, 3:49 PM CDT for 20 counties in Texas; Beaver County, Cimarron County, Texas County, Oklahoma. It took effect at Oct 21, 2015, 1:00 PM CDT. It was in force for 27 hr.

The area

The counties it named.

The facts

Issued: Oct 20, 2015, 3:49 PM CDT (20:49 UTC)
In effect from: Oct 21, 2015, 1:00 PM CDT
Expired: Oct 22, 2015, 3:55 PM CDT
In force: 27 hr
Issued by: NWS Amarillo, TX
Flood severity: None

All 23 counties

Beaver County, OK, Cimarron County, OK, Texas County, OK, Armstrong County, TX, Carson County, TX, Collingsworth County, TX, Dallam County, TX, Deaf Smith County, TX, Donley County, TX, Gray County, TX, Hansford County, TX, Hartley County, TX, Hemphill County, TX, Hutchinson County, TX, Lipscomb County, TX, Moore County, TX, Ochiltree County, TX, Oldham County, TX, Potter County, TX, Randall County, TX, Roberts County, TX, Sherman County, TX, Wheeler County, TX

The radar

The Amarillo radar (KAMA), 66 km from the middle of the area, began a volume at 20:51 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

Dodge City, (KDDC), launched 12:00Z, 8.8 hours before the alert went out and 260 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: 105 J/kg
Mixed-layer CIN: -351 J/kg
Mixed-layer LCL: 1616 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 179 m²/s²
0-3 km storm-relative helicity: 187 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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 Amarillo, TX wrote its last area forecast discussion before this flash flood watch went out at Oct 20, 12:25 PM CDT, 3 hours 24 minutes earlier.

Area forecast discussion, Oct 20, 12:25 PM CDT, 3 hours 24 minutes before

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Hazardous weather outlook, Oct 20, 4:56 AM CDT, 10 hours 53 minutes before

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The office that day

Everything else NWS Amarillo, TX issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Oct 19, 8:11 PM CDT	Special Weather Statement	AMA	Moore	64 min
Oct 19, 8:54 PM CDT	Special Weather Statement	AMA	Hutchinson	51 min
Oct 19, 9:20 PM CDT	Special Weather Statement	AMA	Hutchinson	40 min

Nearby

Flash Flood Watches in Texas, 2015 Flash Flood Watches in Oklahoma, 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.