Alert archive / Mississippi / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 48, NWS New Orleans, LA

May 18, 2018Hancock County, Harrison County, Mississippi

NWS New Orleans, LA issued this severe thunderstorm warning at May 18, 2018, 3:43 PM CDT for Hancock County, Harrison County, Mississippi. It was in force for 20 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 18, 2018, 3:43 PM CDT (20:43 UTC)
Expired: May 18, 2018, 4:03 PM CDT
In force: 20 min
Issued by: NWS New Orleans, LA
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Hancock County, MS, Harrison County, MS

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 8.7 hours before the alert went out and 37 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: 1196 J/kg
Mixed-layer CIN: -46 J/kg
Mixed-layer LCL: 1044 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: 58 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

708 
WUUS54 KLIX 182043
SVRLIX
MSC045-047-182115-
/O.NEW.KLIX.SV.W.0048.180518T2043Z-180518T2115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service New Orleans LA
343 PM CDT FRI MAY 18 2018

The National Weather Service in New Orleans has issued a

* Severe Thunderstorm Warning for...
  Southwestern Harrison County in southeastern Mississippi...
  Southeastern Hancock County in southern Mississippi...

* Until 415 PM CDT.

* At 343 PM CDT, a severe thunderstorm was located over Diamondhead,
  moving east at 25 mph.

  HAZARD...60 mph wind gusts and half dollar size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Long Beach, Bay St. Louis, Waveland, Diamondhead, Kiln and
  Shoreline Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should move immediately to shelter inside a strong building. Stay
away from windows.

&&

LAT...LON 3030 8929 3036 8928 3036 8931 3038 8932
      3037 8935 3034 8938 3034 8934 3032 8932
      3031 8933 3026 8940 3026 8943 3044 8947
      3052 8923 3033 8919
TIME...MOT...LOC 2043Z 289DEG 23KT 3036 8936 

HAIL...1.25IN
WIND...60MPH
 
$$

32

1 follow-up statement

279 
WWUS54 KLIX 182103
SVSLIX

Severe Weather Statement
National Weather Service New Orleans LA
403 PM CDT FRI MAY 18 2018

MSC045-047-182112-
/O.CAN.KLIX.SV.W.0048.000000T0000Z-180518T2115Z/
Harrison MS-Hancock MS-
403 PM CDT FRI MAY 18 2018

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN HARRISON AND
SOUTHEASTERN HANCOCK COUNTIES IS CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
New Orleans.

LAT...LON 3030 8929 3036 8928 3036 8931 3038 8932
      3037 8935 3034 8938 3034 8934 3032 8932
      3031 8933 3026 8940 3026 8943 3044 8947
      3052 8923 3033 8919
TIME...MOT...LOC 2101Z 289DEG 23KT 3032 8922 

$$

32

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 New Orleans, LA wrote its last area forecast discussion before this severe thunderstorm warning went out at May 18, 12:12 PM CDT, 3 hours 31 minutes earlier.

Area forecast discussion, May 18, 12:12 PM CDT, 3 hours 31 minutes before

Area Forecast Discussion
National Weather Service New Orleans LA
1212 PM CDT Fri May 18 2018

.AVIATION...

VFR conditions will be the rule at all of the terminals, but there
will be some scattered convection around today. Have VCTS wording
in place through 00z to reflect this risk, and will amend the
forecast if convection looks to impact a terminal. If a storm
passses over, a brief period of gusty winds and reduced
visibilities can be expected. Additionally, a period of MVFR
visibilities could develop around 12z at KMCB and KBTR due to
light fog. 32

&&

.PRELIMINARY POINT TEMPS/POPS...
MCB  67  93  68  92 /  20  20  10  30
BTR  71  93  71  92 /  20  20  10  30
ASD  68  93  69  92 /  20  20  10  30
MSY  74  93  74  92 /  20  20  10  30
GPT  72  92  72  91 /  20  20  10  30
PQL  68  92  68  91 /  20  20  10  30

&&

.LIX WATCHES/WARNINGS/ADVISORIES...
LA...None.
GM...None.
MS...None.
GM...None.
&&

Hazardous weather outlook, May 18, 11:02 AM CDT, 4 hours 41 minutes before

Hazardous Weather Outlook
National Weather Service New Orleans LA
1102 AM CDT Fri May 18 2018

GMZ530-532-534-536-538-550-552-555-557-570-572-575-577-LAZ034>037-
039-040-046>050-056>072-MSZ068>071-077-080>082-190415-
Lake Pontchartrain and Lake Maurepas-Mississippi Sound-
Lake Borgne-Chandeleur Sound-Breton Sound-
Coastal Waters from Port Fourchon LA to Lower Atchafalaya River
LA out 20 nm-
Coastal waters from the Southwest Pass of the Mississippi River
to Port Fourchon Louisiana out 20 NM-
Coastal Waters from Boothville LA to Southwest Pass of the
Mississippi River out 20 nm-
Coastal waters from Pascagoula Mississippi to Stake Island out
20 NM-
Coastal waters from Port Fourchon Louisiana to Lower Atchafalaya
River LA from 20 to 60 NM-
Coastal waters from Southwest Pass of the Mississippi River to
Port Fourchon Louisiana from 20 to 60 NM-
Coastal Waters from Stake Island LA to Southwest Pass of the
Mississippi River from 20 to 60 nm-
Coastal waters from Pascagoula Mississippi to Stake Island
Louisiana out 20 to 60 NM-Pointe Coupee-West Feliciana-
East Feliciana-St. Helena-Washington-St. Tammany-Iberville-
West Baton Rouge-East Baton Rouge-Ascension-Livingston-Assumption-
St. James-St. John The Baptist-Upper Lafourche-St. Charles-
Upper Jefferson-Orleans-Upper Plaquemines-Upper St. Bernard-
Upper Terrebonne-Lower Terrebonne-Lower Lafourche-Lower Jefferson-
Lower Plaquemines-Lower St. Bernard-Northern Tangipahoa-
Southern Tangipahoa-Wilkinson-Amite-Pike-Walthall-Pearl River-
Hancock-Harrison-Jackson-
1102 AM CDT Fri May 18 2018

This Hazardous Weather Outlook is for portions of Southeast
Louisiana...South Mississippi and the adjacent coastal waters.

.DAY ONE...This Afternoon and Tonight

Isolated to scattered thunderstorms are possible, mainly during
the afternoon and early evening hours. A few storms could become
strong to severe. Gusty winds, hail and frequent lightning will
be possible with the strongest storms.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

Isolated to scattered showers and thunderstorms will be possible
each day through Thursday. A few strong to severe thunderstorms
will be possible. The main hazard would be strong downburst winds,
though hail and periods of frequent lightning will also be a
concern.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated.

32

In the hours before

Special weather statement, May 18, 3:01 PM CDT, 42 minutes before

Special Weather Statement
National Weather Service New Orleans LA
301 PM CDT FRI MAY 18 2018

LAZ036-MSZ068-069-182030-
East Feliciana-Wilkinson-Amite-
301 PM CDT FRI MAY 18 2018

...A STRONG THUNDERSTORM WILL AFFECT NORTHEASTERN EAST FELICIANA
PARISH...SOUTHEASTERN WILKINSON AND SOUTHWESTERN AMITE COUNTIES...

At 301 PM CDT, a strong thunderstorm was located over Centreville, or
15 miles north of Clinton, moving east at 10 mph.

Winds in excess of 30 mph and half inch hail are possible with this
storm.

Locations impacted include...
Centreville, Norwood and Felps.

LAT...LON 3113 9079 3095 9085 3095 9086 3094 9086
      3087 9088 3099 9118 3100 9118 3100 9121
      3117 9115
TIME...MOT...LOC 2001Z 279DEG 9KT 3107 9110

32

Special weather statement, May 18, 3:07 PM CDT, 36 minutes before

Special Weather Statement
National Weather Service New Orleans LA
307 PM CDT FRI MAY 18 2018

LAZ036-037-048-182030-
St. Helena-East Feliciana-East Baton Rouge-
307 PM CDT FRI MAY 18 2018

...A STRONG THUNDERSTORM WILL AFFECT SOUTHWESTERN ST. HELENA...
SOUTHEASTERN EAST FELICIANA AND NORTHEASTERN EAST BATON ROUGE
PARISHES...

At 307 PM CDT, a strong thunderstorm was located near Clinton, moving
east at 10 mph.

Winds in excess of 30 mph and half inch hail are possible with this
storm.

Locations impacted include...
Clinton and Darlington.

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

LAT...LON 3090 9071 3065 9076 3065 9082 3071 9103
      3089 9100
TIME...MOT...LOC 2007Z 279DEG 9KT 3080 9094

32

Special weather statement, May 18, 3:16 PM CDT, 27 minutes before

Special Weather Statement
National Weather Service New Orleans LA
316 PM CDT FRI MAY 18 2018

LAZ050-182100-
Livingston-
316 PM CDT FRI MAY 18 2018

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT LIVINGSTON PARISH...

At 316 PM CDT, radar indicated strong thunderstorms were located
along a line extending from near Walker to near Port Vincent.
Movement was east at 10 mph.

Winds in excess of 30 mph and dime size hail are possible with these
storms.

Locations impacted include...
Denham Springs, Walker, Livingston, French Settlement, Port Vincent,
Watson and Killian.

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

These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

LAT...LON 3059 9098 3065 9078 3065 9066 3032 9052
      3030 9056 3029 9057 3032 9084 3035 9087
      3035 9090 3054 9098 3056 9097 3058 9099
TIME...MOT...LOC 2016Z 265DEG 8KT 3054 9090 3041 9084

32

Special weather statement, May 18, 3:24 PM CDT, 19 minutes before

Special Weather Statement
National Weather Service New Orleans LA
324 PM CDT FRI MAY 18 2018

LAZ039-040-071-072-182115-
Washington-Northern Tangipahoa-Southern Tangipahoa-St. Tammany-
324 PM CDT FRI MAY 18 2018

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT NORTHWESTERN ST.
TAMMANY...NORTHEASTERN TANGIPAHOA AND CENTRAL WASHINGTON PARISHES...

At 324 PM CDT, radar indicated strong thunderstorms were located
along a line extending from near Franklinton to near Wilmer. Movement
was southeast at 15 mph.

Winds in excess of 30 mph and half inch hail are possible with these
storms.

Locations impacted include...
Bogalusa, Franklinton, Folsom, Sun, Enon and Wilmer.

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

LAT...LON 3074 8983 3072 8983 3070 8985 3070 8984
      3066 8984 3059 9027 3088 9045 3094 9009
TIME...MOT...LOC 2024Z 321DEG 13KT 3088 9012 3085 9033

32

Special weather statement, May 18, 3:38 PM CDT, 5 minutes before

Special Weather Statement
National Weather Service New Orleans LA
338 PM CDT FRI MAY 18 2018

MSZ080-081-182115-
Harrison-Hancock-
338 PM CDT FRI MAY 18 2018

...A STRONG THUNDERSTORM WILL AFFECT SOUTHWESTERN HARRISON AND EAST
CENTRAL HANCOCK COUNTIES...

At 338 PM CDT, a strong thunderstorm was located over Diamondhead,
moving east at 25 mph.

Winds in excess of 30 mph and nickel size hail are possible with this
storm.

Locations impacted include...
Gulfport, Long Beach, Bay St. Louis, Waveland, Diamondhead, Kiln,
Shoreline Park and Gulfport Airport.

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

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

LAT...LON 3037 8906 3030 8927 3031 8929 3036 8928
      3036 8931 3038 8932 3037 8935 3034 8938
      3034 8934 3032 8932 3027 8938 3032 8949
      3046 8945 3043 8904
TIME...MOT...LOC 2038Z 284DEG 23KT 3038 8940

32

Special weather statement, May 18, 3:42 PM CDT, 1 minute before

Special Weather Statement
National Weather Service New Orleans LA
342 PM CDT FRI MAY 18 2018

LAZ057-058-060-182115-
St. Charles-St. John The Baptist-St. James-
342 PM CDT FRI MAY 18 2018

...A STRONG THUNDERSTORM WILL AFFECT ST. JOHN THE BAPTIST...
SOUTHEASTERN ST. JAMES AND NORTHWESTERN ST. CHARLES PARISHES...

At 342 PM CDT, a strong thunderstorm was located near Wallace, or
near Reserve, moving east at 5 mph.

Winds in excess of 30 mph and nickel size hail are possible with this
storm.

Locations impacted include...
Reserve, Laplace, Hahnville, Gramercy, Lutcher, Killona, Montz,
Edgard, Garyville, Wallace, Taft, Paradis, North Vacherie, Boutte and
South Vacherie.

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

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

LAT...LON 2988 9053 2989 9054 2989 9067 3007 9071
      3015 9046 2988 9041
TIME...MOT...LOC 2042Z 259DEG 6KT 3000 9061

32

The office that day

Everything else NWS New Orleans, LA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 17, 7:22 PM CDT	Severe Thunderstorm Warning	LIX	Jackson	23 min
May 17, 7:53 PM CDT	Severe Thunderstorm Warning	LIX	Jackson	37 min
May 17, 8:00 PM CDT	Severe Thunderstorm Warning	LIX	Jackson	30 min
May 17, 8:26 PM CDT	Severe Thunderstorm Warning	LIX	Jackson	19 min
May 18, 1:41 PM CDT	Special Weather Statement	LIX	Wilkinson	49 min
May 18, 1:51 PM CDT	Severe Thunderstorm Warning	LIX	Amite, Wilkinson	39 min
May 18, 1:54 PM CDT	Special Weather Statement	LIX	Jackson	51 min
May 18, 2:03 PM CDT	Severe Thunderstorm Warning	LIX	Jackson	42 min
May 18, 2:25 PM CDT	Severe Thunderstorm Warning	LIX	Amite	50 min
May 18, 2:53 PM CDT	Severe Thunderstorm Warning	LIX	Amite, Pike	16 min
May 18, 3:38 PM CDT	Special Weather Statement	LIX	Harrison	37 min
May 18, 3:55 PM CDT	Special Weather Statement	LIX	Jackson	35 min

Nearby

Severe Thunderstorm Warnings in Mississippi, 2018 Every severe thunderstorm warning in 2018

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.