Alert archive / Arkansas / Special Weather Statements in 2012

Special Weather Statement, NWS Jackson, MS

July 21, 2012Chicot County, Arkansas

NWS Jackson, MS issued this special weather statement at Jul 21, 2012, 3:31 AM CDT for Chicot County, Arkansas. It was in force for 44 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: Jul 21, 2012, 3:31 AM CDT (08:31 UTC)
Expired: Jul 21, 2012, 4:15 AM CDT
In force: 44 min
Issued by: NWS Jackson, MS

County Chicot County, AR

The radar

The Little Rock radar (KLZK), 167 km from the middle of the area, began a volume at 08:31 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, 8.5 hours before the alert went out and 181 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: 4897 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 1030 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 7 m²/s²
0-3 km storm-relative helicity: 121 m²/s²
Significant tornado parameter: 1.7
Supercell composite: 9.9

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 Jul 21, 3:19 AM CDT, 12 minutes earlier.

Area forecast discussion, Jul 21, 3:19 AM CDT, 12 minutes before

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Hazardous weather outlook, Jul 20, 7:25 PM CDT, 8 hours 6 minutes before

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In the hours before

Special weather statement, Jul 21, 3:31 AM CDT, 0 minutes before

ARZ075-210915-
CHICOT AR-
331 AM CDT SAT JUL 21 2012

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSON MS
331 AM CDT SAT JUL 21 2012

A STRONG THUNDERSTORM CAPABLE OF PRODUCING 40 TO 50 MPH WINDS WAS
LOCATED 7 MILES NORTH OF DERMOTT AT 331 AM CDT...MOVING SOUTH AT 15
MPH.

VERY HEAVY RAIN ALONG WITH CONTINUOUS CLOUD TO GROUND LIGHTNING ARE
ALSO POSSIBLE WITH THIS STORM.

PEOPLE IN NORTHWESTERN CHICOT COUNTY SHOULD MONITOR THIS STORM
CLOSELY.

LAT...LON 3357 9135 3356 9134 3354 9134 3352 9132
      3341 9131 3340 9146 3352 9146 3356 9146
      3357 9145
TIME...MOT...LOC 0831Z 359DEG 12KT 3362 9144

CME

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 20, 7:00 PM CDT	Special Weather Statement	JAN	Simpson	30 min
Jul 20, 7:07 PM CDT	Severe Thunderstorm Warning	JAN	Claiborne	38 min
Jul 20, 7:11 PM CDT	Special Weather Statement	JAN	Simpson	29 min
Jul 21, 3:48 AM CDT	Special Weather Statement	JAN	Noxubee	32 min
Jul 21, 4:19 AM CDT	Special Weather Statement	JAN	Lowndes, Noxubee	56 min
Jul 21, 5:45 AM CDT	Special Weather Statement	JAN	Newton	45 min
Jul 21, 5:50 AM CDT	Severe Thunderstorm Warning	JAN	Newton	27 min
Jul 21, 6:38 AM CDT	Flash Flood Warning	JAN	Kemper, Lauderdale	2 hr
Jul 21, 6:56 AM CDT	Special Weather Statement	JAN	Rankin	59 min
Jul 21, 7:07 AM CDT	Flash Flood Warning	JAN	Holmes	3 hr
Jul 21, 8:28 AM CDT	Flash Flood Warning	JAN	Rankin	2 hr
Jul 21, 9:25 AM CDT	Flash Flood Warning	JAN	Copiah, Franklin, Lincoln	2 hr
Jul 21, 5:47 AM CDT	Special Weather Statement	JAN	West Carroll	43 min
Jul 21, 4:11 AM CDT	Special Weather Statement	JAN	Ashley	44 min

Nearby

Special Weather Statements in Arkansas, 2012 Every special weather statement in 2012

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.