Alert archive / Alabama / Flash Flood Watches in 2017

Flash Flood Watch 1, NWS Huntsville, AL

July 1, 20175 counties in Alabama

NWS Huntsville, AL issued this flash flood watch at Jul 1, 2017, 2:45 AM CDT for 5 counties in Alabama. It took effect at Jul 1, 2017, 7:00 AM CDT. It was in force for 12 hr.

The area

The counties it named.

The facts

Issued: Jul 1, 2017, 2:45 AM CDT (07:45 UTC)
In effect from: Jul 1, 2017, 7:00 AM CDT
Expired: Jul 1, 2017, 6:32 PM CDT
In force: 12 hr
Issued by: NWS Huntsville, AL
Flood severity: None

Counties Cullman County, AL, DeKalb County, AL, Jackson County, AL, Marshall County, AL, Morgan County, AL

The radar

The Northeast Alabama radar (KHTX), 61 km from the middle of the area, began a volume at 07:47 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

Birmingham, AL (KBMX), launched 00:00Z, 7.8 hours before the alert went out and 145 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: 496 J/kg
Mixed-layer CIN: -70 J/kg
Mixed-layer LCL: 821 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 128 m²/s²
0-3 km storm-relative helicity: 119 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 Huntsville, AL wrote its last area forecast discussion before this flash flood watch went out at Jun 30, 6:37 PM CDT, 8 hours 8 minutes earlier.

Area forecast discussion, Jun 30, 6:37 PM CDT, 8 hours 8 minutes before

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Hazardous weather outlook, Jun 30, 2:57 PM CDT, 11 hours 48 minutes before

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    <section class="card" role="status" aria-live="polite">
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      <h1 id="headline">This service is currently unavailable.</h1>
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        The site you requested is temporarily down for maintenance or an unexpected outage.
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        Please try again in a few minutes.
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The office that day

Everything else NWS Huntsville, AL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 1, 3:35 PM CDT	Special Weather Statement	HUN	Cullman	40 min
Jul 1, 3:55 PM CDT	Severe Thunderstorm Warning	HUN	Cullman, Morgan	17 min
Jul 1, 1:33 PM CDT	Special Weather Statement	HUN	Franklin	27 min
Jul 1, 2:00 PM CDT	Special Weather Statement	HUN	Franklin	45 min

Nearby

Flash Flood Watches in Alabama, 2017 Every flash flood watch in 2017

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.