Alert archive / Mississippi / Special Weather Statements in 2017

Special Weather Statement, NWS Jackson, MS

August 19, 2017Forrest County, Lamar County, Mississippi

NWS Jackson, MS issued this special weather statement at Aug 19, 2017, 3:52 PM CDT for Forrest County, Lamar County, Mississippi. It was in force for 38 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
Aug 19, 2017, 3:52 PM CDT (20:52 UTC)
Expired
Aug 19, 2017, 4:30 PM CDT
In force
38 min
Issued by
NWS Jackson, MS

Counties Forrest County, MS, Lamar County, MS

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 8.9 hours before the alert went out and 92 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-pSkew-T log-p diagram, Slidell Radar S, LA at 12:00Z on 2017-08-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1945 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Slidell Radar S, LA at 12:00Z on 2017-08-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 9 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
1945 J/kg
Mixed-layer CIN
-32 J/kg
Mixed-layer LCL
978 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
9 m²/s²
0-3 km storm-relative helicity
21 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 Aug 19, 12:38 PM CDT, 3 hours 14 minutes earlier.

Area forecast discussion, Aug 19, 12:38 PM CDT, 3 hours 14 minutes before
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Hazardous weather outlook, Aug 19, 3:10 PM CDT, 42 minutes before
Hazardous Weather Outlook
National Weather Service Jackson MS
310 PM CDT Sat Aug 19 2017

ARZ074-075-LAZ007>009-015-016-023>026-MSZ018-019-025>028-034>037-
040>066-072>074-202015-
Ashley-Chicot-Morehouse-West Carroll-East Carroll-Richland-
Madison LA-Franklin LA-Catahoula-Tensas-Concordia-Bolivar-
Sunflower-Leflore-Grenada-Carroll-Montgomery-Washington-Humphreys-
Holmes-Attala-Issaquena-Sharkey-Yazoo-Madison MS-Leake-Neshoba-
Kemper-Warren-Hinds-Rankin-Scott-Newton-Lauderdale-Claiborne-
Copiah-Simpson-Smith-Jasper-Clarke-Jefferson-Adams-Franklin MS-
Lincoln-Lawrence-Jefferson Davis-Covington-Jones-Marion-Lamar-
Forrest-
310 PM CDT Sat Aug 19 2017

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

.DAY ONE...Tonight and Sunday

EXCESSIVE HEAT
THREAT...Elevated
TIMING...Sunday

Temperatures in the low to mid 90s are expected to combine with
dewpoints in the mid to upper 70s again Sunday. This will result
in heat index values ranging from 105-109 degrees from 11AM til
7PM. Exposure to these conditions will raise the likelihood of
heat related illnesses.

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

.DAYS TWO THROUGH SEVEN...Sunday night through Friday

Temperatures in the low to mid 90s are expected to combine with
dewpoints in the low to mid 70s to result in heat index values
ranging from 102-105 degrees mainly during the afternoon Monday.
This area is primarily west of Interstate 55. Prolonged exposure
to these conditions raise the likelihood of heat related
illnesses.

(www.weather.gov/images/jan/graphicast/image2.png)

.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 Friday.

MSZ029>033-038-039-202015-
Webster-Clay-Lowndes-Choctaw-Oktibbeha-Winston-Noxubee-
310 PM CDT Sat Aug 19 2017

This hazardous weather outlook is for portions of central
Mississippi, east central Mississippi, north central Mississippi,
and northeast Mississippi.

.DAY ONE...Tonight and Sunday

EXCESSIVE HEAT
THREAT...Limited
TIMING...Sunday

Temperatures in the low to mid 90s are expected to combine with
dewpoints in the low to mid 70s to result in heat index values
ranging from 102-105 degrees mainly during the afternoon again
Sunday. Prolonged exposure to these conditions raise the
likelihood of heat related illnesses.

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

.DAYS TWO THROUGH SEVEN...Sunday night through Friday

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 Friday.

21

&&

...HAZARD LEGEND...

*EXCESSIVE HEAT*
Extreme...Maximum heat index greater than 110 degrees for 3 or
 more days in a row and/or air temperatures greater than 107
 degrees.
Significant...Maximum heat index greater than 110 degrees
 and/or air temperatures greater than 105 degrees.
Elevated...Maximum heat index 105 to 110 degrees and/or air
 temperatures greater than 103 degrees.
Limited...Maximum heat index near 105 degrees and/or air
 temperatures 100 to 103 degrees.

...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

Tropical page...
   www.weather.gov/jan/tropical
National Hurricane Center Home Page...
   www.nhc.noaa.gov/
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

In the hours before

Special weather statement, Aug 19, 12:57 PM CDT, 2 hours 55 minutes before
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Special weather statement, Aug 19, 3:21 PM CDT, 31 minutes before
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Special weather statement, Aug 19, 3:28 PM CDT, 24 minutes before
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Special weather statement, Aug 19, 3:52 PM CDT, 0 minutes before
Special Weather Statement
National Weather Service Jackson MS
352 PM CDT SAT AUG 19 2017

MSZ073-074-192130-
Lamar MS-Forrest MS-
352 PM CDT SAT AUG 19 2017

...STRONG STORMS WILL AFFECT FORREST AND LAMAR COUNTIES UNTIL 430 PM
CDT...

At 352 PM CDT, Meteorologists were tracking strong thunderstorms
along a line extending from near Sunrise to near Improve. Movement
was south at 15 mph.

Dime size hail and winds in excess of 40 mph will be possible with
these storms.

Strong thunderstorms will be near...
  Mclaurin around 425 PM CDT.
  Baxterville and Brooklyn around 430 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with these storms, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3096 8934 3100 8934 3101 8935 3101 8942
      3098 8943 3098 8947 3100 8948 3100 8950
      3101 8950 3101 8955 3100 8955 3100 8965
      3133 8965 3137 8915 3100 8915 3100 8914
      3098 8914
TIME...MOT...LOC 2052Z 354DEG 15KT 3131 8916 3128 8963

EC

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 19, 12:57 PM CDTSpecial Weather StatementJANForrest63 min
Aug 19, 3:21 PM CDTSpecial Weather StatementJANMarion39 min
Aug 19, 3:28 PM CDTSpecial Weather StatementJANClaiborne47 min
Aug 19, 3:57 PM CDTSevere Thunderstorm WarningJANWarren32 min
Aug 19, 4:28 PM CDTSpecial Weather StatementJANForrest, Lamar47 min
Aug 19, 4:42 PM CDTSpecial Weather StatementJANCopiah63 min
Aug 19, 5:10 PM CDTSpecial Weather StatementJANForrest35 min
Aug 19, 5:47 PM CDTSpecial Weather StatementJANJasper58 min
Aug 19, 5:54 PM CDTSevere Thunderstorm WarningJANJasper, Smith34 min
Aug 19, 6:08 PM CDTSpecial Weather StatementJANFranklin67 min
Aug 19, 4:37 PM CDTSpecial Weather StatementJANRichland53 min
Aug 18, 8:23 PM CDTSpecial Weather StatementJANChicot52 min

Nearby

Special Weather Statements in Mississippi, 2017Every 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.