Alert archive / Mississippi / Special Weather Statements in 2011

Special Weather Statement, NWS Jackson, MS

May 21, 20115 counties in Mississippi

NWS Jackson, MS issued this special weather statement at May 21, 2011, 6:11 AM CDT for 5 counties in Mississippi. It was in force for 59 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 21, 2011, 6:11 AM CDT (11:11 UTC)
Expired: May 21, 2011, 7:10 AM CDT
In force: 59 min
Issued by: NWS Jackson, MS

Counties Attala County, MS, Carroll County, MS, Grenada County, MS, Holmes County, MS, Montgomery County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 140 km from the middle of the area, began a volume at 11:12 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 00:00Z, 11.2 hours before the alert went out and 137 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: 1050 J/kg
Mixed-layer CIN: -67 J/kg
Mixed-layer LCL: 1659 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 65 m²/s²
0-3 km storm-relative helicity: 123 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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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 21, 4:46 AM CDT, 1 hour 25 minutes earlier.

Area forecast discussion, May 21, 4:46 AM CDT, 1 hour 25 minutes before

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Hazardous weather outlook, May 21, 5:26 AM CDT, 45 minutes before

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In the hours before

Special weather statement, May 21, 2:39 AM CDT, 3 hours 32 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSON MS
239 AM CDT SAT MAY 21 2011

ARZ074-LAZ007-015-023-210840-
ASHLEY AR-MOREHOUSE LA-RICHLAND LA-FRANKLIN LA-
239 AM CDT SAT MAY 21 2011

...LINE OF THUNDERSTORMS CAPABLE OF PRODUCING STRONG WIND GUSTS...

A LINE OF STRONG THUNDERSTORMS CAPABLE OF PRODUCING 40 TO 50 MPH
WINDS WAS LOCATED FROM CROSSETT TO 20 MILES SOUTHWEST OF MANGHAM AT
238 AM CDT...MOVING NORTHEAST AT 25 MPH.

PEOPLE IN ASHLEY COUNTY...AND WEST CENTRAL FRANKLIN...WESTERN
RICHLAND AND MOREHOUSE PARISHES SHOULD MONITOR THESE STORMS CLOSELY.

LAT...LON 3239 9200 3252 9191 3267 9191 3266 9194
      3271 9197 3271 9203 3335 9198 3341 9184
      3340 9156 3276 9161 3205 9182 3202 9189
      3208 9192 3213 9187 3217 9191 3217 9197
      3220 9201 3227 9200 3228 9203
TIME...MOT...LOC 0738Z 242DEG 16KT 3330 9189 3261 9194
          3199 9213

EEC

Special weather statement, May 21, 4:18 AM CDT, 1 hour 53 minutes before

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Local storm report, May 21, 4:59 AM CDT, 1 hour 12 minutes before

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Special weather statement, May 21, 6:08 AM CDT, 3 minutes before

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Special weather statement, May 21, 6:11 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 21, 4:18 AM CDT	Special Weather Statement	JAN	Issaquena, Sharkey, Washington	57 min
May 21, 6:08 AM CDT	Special Weather Statement	JAN	Copiah, Franklin, Hinds	47 min
May 21, 3:23 PM CDT	Areal Flood Warning	JAN	Issaquena, Sharkey, Warren	48 hr
May 21, 3:32 PM CDT	Areal Flood Warning	JAN	Claiborne, Warren	48 hr
May 21, 3:38 AM CDT	Severe Thunderstorm Warning	JAN	Morehouse, Richland, West Carroll	52 min

Nearby

Special Weather Statements in Mississippi, 2011 Every special weather statement in 2011

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.