Alert archive / Mississippi / Special Weather Statements in 2017

Special Weather Statement, NWS Jackson, MS

May 12, 2017Webster County, Mississippi

NWS Jackson, MS issued this special weather statement at May 12, 2017, 2:39 AM CDT for Webster County, Mississippi. It was in force for 51 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: May 12, 2017, 2:39 AM CDT (07:39 UTC)
Expired: May 12, 2017, 3:30 AM CDT
In force: 51 min
Issued by: NWS Jackson, MS

County Webster County, MS

The radar

The Columbus AFB radar (KGWX), 74 km from the middle of the area, began a volume at 07:39 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 (KBYH), launched 00:00Z, 7.7 hours before the alert went out and 149 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: 976 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 1041 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 65 m²/s²
0-3 km storm-relative helicity: 6 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 2.6

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at May 12, 12:18 AM CDT, 2 hours 21 minutes earlier.

Area forecast discussion, May 12, 12:18 AM CDT, 2 hours 21 minutes before

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Hazardous weather outlook, May 11, 8:53 PM CDT, 5 hours 46 minutes before

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In the hours before

Special weather statement, May 11, 11:08 PM CDT, 3 hours 31 minutes before

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Special weather statement, May 11, 11:43 PM CDT, 2 hours 56 minutes before

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Special weather statement, May 12, 2:04 AM CDT, 35 minutes before

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Special weather statement, May 12, 2:39 AM CDT, 0 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 11, 11:43 PM CDT	Special Weather Statement	JAN	Bolivar, Sunflower	32 min
May 12, 2:04 AM CDT	Special Weather Statement	JAN	Montgomery	26 min
May 12, 9:49 AM CDT	Special Weather Statement	JAN	Covington, Jones	41 min
May 12, 10:08 AM CDT	Special Weather Statement	JAN	Jones	52 min
May 12, 10:29 AM CDT	Special Weather Statement	JAN	Jones	46 min
May 12, 10:48 AM CDT	Special Weather Statement	JAN	Jones	42 min
May 12, 2:44 PM CDT	Special Weather Statement	JAN	Lawrence	46 min
May 12, 3:05 PM CDT	Severe Thunderstorm Warning	JAN	Jefferson Davis, Lawrence	40 min
May 12, 3:44 PM CDT	Special Weather Statement	JAN	Jefferson Davis	31 min
May 12, 3:49 PM CDT	Special Weather Statement	JAN	Bolivar	26 min
May 12, 4:12 PM CDT	Special Weather Statement	JAN	Covington	33 min
May 12, 4:17 PM CDT	Special Weather Statement	JAN	Washington	43 min
May 12, 4:52 PM CDT	Special Weather Statement	JAN	Sunflower	23 min
May 12, 5:05 PM CDT	Special Weather Statement	JAN	Washington	25 min
May 12, 5:21 PM CDT	Special Weather Statement	JAN	Leake	24 min
May 12, 5:23 PM CDT	Special Weather Statement	JAN	Sharkey	37 min
May 12, 5:25 PM CDT	Severe Thunderstorm Warning	JAN	Leake, Neshoba, Scott	50 min
May 12, 5:28 PM CDT	Special Weather Statement	JAN	Grenada	32 min
May 12, 5:32 PM CDT	Severe Thunderstorm Warning	JAN	Grenada, Montgomery	24 min
May 12, 6:04 PM CDT	Special Weather Statement	JAN	Carroll	26 min
May 12, 6:15 PM CDT	Severe Thunderstorm Warning	JAN	Attala, Leake, Neshoba, Winston	18 min
May 12, 6:20 PM CDT	Special Weather Statement	JAN	Montgomery	25 min
May 12, 6:26 PM CDT	Special Weather Statement	JAN	Grenada	34 min
May 12, 6:40 PM CDT	Special Weather Statement	JAN	Winston	35 min
May 12, 6:42 PM CDT	Special Weather Statement	JAN	Carroll	33 min
May 12, 6:47 PM CDT	Special Weather Statement	JAN	Yazoo	43 min
May 12, 6:55 PM CDT	Flash Flood Warning	JAN	Grenada	2 hr
May 11, 11:08 PM CDT	Special Weather Statement	JAN	Ashley	37 min
May 12, 2:33 PM CDT	Special Weather Statement	JAN	Chicot	42 min
May 12, 3:19 PM CDT	Special Weather Statement	JAN	Chicot	41 min
May 12, 3:52 PM CDT	Special Weather Statement	JAN	Chicot	38 min
May 12, 4:49 PM CDT	Special Weather Statement	JAN	Ashley	41 min
May 12, 5:28 PM CDT	Severe Thunderstorm Warning	JAN	Ashley	24 min

Nearby

Special Weather Statements in Mississippi, 2017 Every special weather statement 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.