Alert archive / Mississippi / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 160, NWS Memphis, TN

August 20, 2002Tishomingo County, Mississippi

NWS Memphis, TN issued this severe thunderstorm warning at Aug 20, 2002, 3:41 PM CDT for Tishomingo County, Mississippi. It was in force for 34 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 20, 2002, 3:41 PM CDT (20:41 UTC)
Expired: Aug 20, 2002, 4:15 PM CDT
In force: 34 min
Issued by: NWS Memphis, TN
Area: Counties, with a storm outline in the text

County Tishomingo County, MS

What was reported inside it

Time	Report	Where	Remark
Aug 20, 4:00 PM CDT	Thunderstorm Wind	Iuka, MS	A carport and several trees were blown down.

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Aug 20, 2:10 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Little Rock, AR (KLZK), launched 12:00Z, 8.7 hours before the alert went out and 160 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: 5075 J/kg
Mixed-layer CIN: -68 J/kg
Mixed-layer LCL: 1120 m above ground
0-6 km bulk shear: 3 kt
0-1 km storm-relative helicity: -11 m²/s²
0-3 km storm-relative helicity: 23 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.

606 
WUUS54 KMEG 202041
SVRMEM
MSC141-202115-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MEMPHIS TN
ISSUED BY NWS BIRMINGHAM AL
339 PM CDT TUE AUG 20 2002

THE NATIONAL WEATHER SERVICE IN MEMPHIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  TISHOMINGO COUNTY IN NORTHEAST MISSISSIPPI

* UNTIL 415 PM CDT

* AT 333 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM OVER IUKA...OR ABOUT 2 MILES EAST OF IUKA...
  MOVING SOUTHWEST AT 10 MPH.

* LOCATIONS IN THE PATH OF THIS STORM INCLUDE IUKA 

STRONG DAMAGING WIND...AND LARGE HAIL ARE LIKELY WITH THIS STORM.
TAKE COVER IN A STURDY SHELTER UNTIL THE STORM PASSES.

REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY
WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST
OFFICE IN MEMPHIS.

LAT...LON 3489 8812 3499 8822 3494 8827 3472 8831
          3459 8815

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 Memphis, TN wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 20, 3:10 PM CDT, 31 minutes earlier.

Area forecast discussion, Aug 20, 3:10 PM CDT, 31 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MEMPHIS TN
ISSUED BY NATIONAL WEATHER SERVICE LITTLE ROCK AR
310 PM CDT TUE AUG 20 2002

INSTABILITY ANALYSIS INDICATES A RIDGE OF AVAILABLE ENERGY FROM
WALNUT RIDGE...TO MEMPHIS...TO TUPELO. LOCAL RADARS INDICATE WIDELY
SCATTERED CONVECTION AFFECTING PORTIONS OF THE CWA. MOST NUMEROUS
ACTIVITY IS ASSOCIATED WITH A MID LEVEL SHEAR AXIS...CENTERED OVER
CENTRAL MISSISSIPPI. EXPECT A DECREASE IN CONVECTION WITH THE LOSS
OF HEATING.

WARM AND GENERALLY DRY CONDITIONS ARE EXPECTED THROUGH THE REST OF
THE SHORT TERM PERIODS...AS MID LEVEL HEIGHTS RISE...AND SURFACE
HIGH PRESSURE BUILD INTO THE REGION.

MEDIUM RANGE MODEL OUTPUT SUGGESTS OVERALL UPPER PATTERNS ACROSS
NORTH AMERICA WILL UNDERGO SOME AMPLIFICATION BY THE END OF THE
WEEK. EXPECT A FRONTAL BOUNDARY TO APPROACH THE REGION FOR SATURDAY
AND EARLY SUNDAY.

.MEG...NONE.

The office that day

Everything else NWS Memphis, TN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 20, 4:23 PM CDT	Severe Thunderstorm Warning	MEG	Tishomingo	37 min
Aug 20, 5:20 PM CDT	Severe Thunderstorm Warning	MEG	Itawamba	25 min
Aug 20, 6:59 PM CDT	Severe Thunderstorm Warning	MEG	Monroe	31 min

Nearby

Severe Thunderstorm Warnings in Mississippi, 2002 Every severe thunderstorm warning in 2002

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.