Alert archive / Mississippi / Flash Flood Watches in 2009

Flash Flood Watch 9, NWS Jackson, MS

May 9, 200917 counties in Mississippi; Ashley County, Chicot County, Arkansas

NWS Jackson, MS issued this flash flood watch at May 9, 2009, 4:16 AM CDT for 17 counties in Mississippi; Ashley County, Chicot County, Arkansas. It took effect at May 9, 2009, 12:00 PM CDT. It was in force for 27 hr.

The area

The counties it named.

The facts

Issued: May 9, 2009, 4:16 AM CDT (09:16 UTC)
In effect from: May 9, 2009, 12:00 PM CDT
Expired: May 10, 2009, 3:22 PM CDT
In force: 27 hr
Issued by: NWS Jackson, MS
Flood severity: None

Counties Ashley County, AR, Chicot County, AR, Attala County, MS, Bolivar County, MS, Carroll County, MS, Choctaw County, MS, Clay County, MS, Grenada County, MS, Holmes County, MS, Humphreys County, MS, Leflore County, MS, Lowndes County, MS, Montgomery County, MS, Noxubee County, MS, Oktibbeha County, MS, Sunflower County, MS, Washington County, MS, Webster County, MS, Winston County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 124 km from the middle of the area, began a volume at 09:17 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 (KLZK), launched 00:00Z, 9.3 hours before the alert went out and 160 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: 2269 J/kg
Mixed-layer CIN: -19 J/kg
Mixed-layer LCL: 988 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 90 m²/s²
0-3 km storm-relative helicity: 245 m²/s²
Significant tornado parameter: 1.6
Supercell composite: 10.2

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 Jackson, MS wrote its last area forecast discussion before this flash flood watch went out at May 8, 8:30 PM CDT, 7 hours 46 minutes earlier.

Area forecast discussion, May 8, 8:30 PM CDT, 7 hours 46 minutes before

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Hazardous weather outlook, May 8, 8:42 PM CDT, 7 hours 34 minutes before

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The office that day

Everything else NWS Jackson, MS issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 9, 5:35 AM CDT	Severe Thunderstorm Warning	JAN	Bolivar, Sunflower	40 min
May 9, 5:02 PM CDT	Severe Thunderstorm Warning	JAN	Washington	43 min
May 9, 5:41 PM CDT	Severe Thunderstorm Warning	JAN	Sharkey, Washington	49 min
May 9, 6:12 PM CDT	Severe Thunderstorm Warning	JAN	Issaquena, Sharkey	48 min
May 9, 6:31 PM CDT	Severe Thunderstorm Warning	JAN	Humphreys, Sharkey	44 min
May 9, 6:37 PM CDT	Severe Thunderstorm Warning	JAN	Carroll, Montgomery	53 min
May 9, 6:43 PM CDT	Flash Flood Warning	JAN	Holmes, Humphreys, Sharkey, Washington, Yazoo	2 hr
May 9, 6:44 PM CDT	Tornado Warning	JAN	Holmes, Humphreys, Yazoo	52 min
May 9, 5:08 PM CDT	Severe Thunderstorm Warning	JAN	Morehouse	52 min
May 9, 5:30 PM CDT	Severe Thunderstorm Warning	JAN	East Carroll, West Carroll	45 min
May 9, 6:06 PM CDT	Severe Thunderstorm Warning	JAN	East Carroll, Madison, Richland, West Carroll	54 min
May 9, 4:47 PM CDT	Severe Thunderstorm Warning	JAN	Ashley	43 min

Nearby

Flash Flood Watches in Mississippi, 2009 Flash Flood Watches in Arkansas, 2009 Every flash flood watch in 2009

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.