Alert archive / Mississippi / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 258, NWS Jackson, MS

May 12, 2017Jefferson Davis County, Lawrence County, Mississippi

NWS Jackson, MS issued this severe thunderstorm warning at May 12, 2017, 3:05 PM CDT for Jefferson Davis County, Lawrence County, Mississippi. It was in force for 40 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: May 12, 2017, 3:05 PM CDT (20:05 UTC)
Expired: May 12, 2017, 3:45 PM CDT
In force: 40 min
Issued by: NWS Jackson, MS
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Jefferson Davis County, MS, Lawrence County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 80 km from the middle of the area, began a volume at 20:05 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

Jackson, MS (KJAN), launched 12:00Z, 8.1 hours before the alert went out and 85 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: 550 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 685 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: 14 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at May 12, 1:32 PM CDT, 1 hour 33 minutes earlier.

Area forecast discussion, May 12, 1:32 PM CDT, 1 hour 33 minutes before

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Hazardous weather outlook, May 12, 3:00 PM CDT, 5 minutes before

Hazardous Weather Outlook
National Weather Service Jackson MS
300 PM CDT Fri May 12 2017

ARZ074-075-LAZ008-009-016-MSZ018-019-025>034-040-041-047-053-059-
061-132000-
Ashley-Chicot-West Carroll-East Carroll-Madison LA-Bolivar-
Sunflower-Leflore-Grenada-Carroll-Montgomery-Webster-Clay-Lowndes-
Choctaw-Oktibbeha-Washington-Issaquena-Sharkey-Warren-Claiborne-
Jefferson-Franklin MS-
300 PM CDT Fri May 12 2017

This hazardous weather outlook is for portions of southeast
Arkansas, northeast Louisiana, central Mississippi, north central
Mississippi, southwest Mississippi, and west central Mississippi.

.DAY ONE...Tonight and Saturday

SEVERE THUNDERSTORMS
THREAT...Marginal
TIMING...This afternoon into early evening

There is a marginal risk for severe storms this afternoon into
the early evening. The main threat will be for damaging wind gusts
and quarter size hail.

(www.weather.gov/images/jan/graphicast/image1.png)

.DAYS TWO THROUGH SEVEN...Saturday night through Thursday

The probability for widespread hazardous weather is low.

.SPOTTER CALL TO ACTION STATEMENT...
The activation of storm spotters, HAM radio operators, and
emergency management personnel in support of severe weather
operations may be needed for portions of the region tonight.

LAZ007-015-023>026-MSZ060-132000-
Morehouse-Richland-Franklin LA-Catahoula-Tensas-Concordia-Adams-
300 PM CDT Fri May 12 2017

This hazardous weather outlook is for portions of northeast
Louisiana, and southwest Mississippi.

.DAY ONE...Tonight and Saturday

The probability for widespread hazardous weather is low.

.DAYS TWO THROUGH SEVEN...Saturday night through Thursday

The probability for widespread hazardous weather is low.

.SPOTTER CALL TO ACTION STATEMENT...
The activation of storm spotters, HAM radio operators, and
emergency management personnel in support of severe weather
operations is not expected through next Thursday.

MSZ035>039-042>046-048>052-054>058-062>066-072>074-132000-
Humphreys-Holmes-Attala-Winston-Noxubee-Yazoo-Madison MS-Leake-
Neshoba-Kemper-Hinds-Rankin-Scott-Newton-Lauderdale-Copiah-
Simpson-Smith-Jasper-Clarke-Lincoln-Lawrence-Jefferson Davis-
Covington-Jones-Marion-Lamar-Forrest-
300 PM CDT Fri May 12 2017

This hazardous weather outlook is for portions of central
Mississippi, east central Mississippi, south central Mississippi,
and southeast Mississippi.

.DAY ONE...Tonight and Saturday

SEVERE THUNDERSTORMS
THREAT...Slight
TIMING...This afternoon into the early evening

There is a slight risk for severe storms this afternoon into the
early evening. The main threat will be for damaging wind gusts and
quarter to half dollar size hail...and a tornado cannot be ruled
out.

(www.weather.gov/images/jan/graphicast/image1.png)

.DAYS TWO THROUGH SEVEN...Saturday night through Thursday

The probability for widespread hazardous weather is low.

.SPOTTER CALL TO ACTION STATEMENT...
The activation of storm spotters, HAM radio operators, and
emergency management personnel in support of severe weather
operations may be needed for portions of the region tonight.

21

&&

...HAZARD LEGEND...

*SEVERE THUNDERSTORMS*
High...Significant severe thunderstorms are expected.
Moderate...Severe storms expected with significant
 severe weather possible.
Enhanced...Severe storms expected.
Slight...Severe storms possible.
Marginal...Isolated severe storms possible.

...USEFUL WEATHER WEB PAGES (URLS)...

NWS JAN Home page...
   www.weather.gov/jan
Stay Aware, Stay Safe NWS JAN Briefing Page...
   www.weather.gov/jan/safe
Latest Weather Briefing...
   www.weather.gov/jan/weather_briefing

Find NWS JAN on Facebook...
   www.facebook.com/NWSJacksonMS
Follow NWS JAN on Twitter...
   @NWSJacksonMS
Follow NWS JAN on Youtube...
   www.youtube.com/user/NWSJacksonMiss

...ADDITIONAL URLS FOR SEVERE WEATHER ISSUES...

Storm Prediction Center (SPC)...
   www.spc.noaa.gov/
Meso Analysis...
   www.spc.noaa.gov/exper/mesoanalysis/Day 1 through 3 Outlooks...
   www.spc.noaa.gov/products/outlook/
Storm Reports...
   www.spc.noaa.gov/climo/online/

In the hours before

Special weather statement, May 12, 10:48 AM CDT, 4 hours 17 minutes before

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Local storm report, May 12, 11:34 AM CDT, 3 hours 31 minutes before

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Local storm report, May 12, 11:37 AM CDT, 3 hours 28 minutes before

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Local storm report, May 12, 11:38 AM CDT, 3 hours 27 minutes before

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Special weather statement, May 12, 2:33 PM CDT, 32 minutes before

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Special weather statement, May 12, 2:44 PM CDT, 21 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, 2:39 AM CDT	Special Weather Statement	JAN	Webster	51 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, 3:44 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

Severe Thunderstorm Warnings in Mississippi, 2017 Every severe thunderstorm warning 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.