Alert archive / Mississippi / Severe Thunderstorm Warnings in 2006
Severe Thunderstorm Warning 155, NWS Jackson, MS
NWS Jackson, MS issued this severe thunderstorm warning at Apr 21, 2006, 1:23 PM CDT for Rankin County, Mississippi. It was in force for 67 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Apr 21, 2006, 1:23 PM CDT (18:23 UTC)
- Expired
- Apr 21, 2006, 2:30 PM CDT
- In force
- 67 min
- Issued by
- NWS Jackson, MS
- Area
- Counties, with a storm outline in the text
County Rankin County, MS
The radar
The Jackson/Brandon,MS radar (KDGX), 4 km from the middle of the area, began a volume at 18:26 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Apr 21, 10:16 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Jackson, MS (KJAN), launched 12:00Z, 6.4 hours before the alert went out and 14 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.
- Mixed-layer CAPE
- 668 J/kg
- Mixed-layer CIN
- -27 J/kg
- Mixed-layer LCL
- 793 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- -14 m²/s²
- 0-3 km storm-relative helicity
- 46 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.6
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 Jackson, MS wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 21, 9:30 AM CDT, 3 hours 53 minutes earlier.
Area forecast discussion, Apr 21, 9:30 AM CDT, 3 hours 53 minutes before
AREA FORECAST DISCUSSION...UPDATED NATIONAL WEATHER SERVICE JACKSON MS 930 AM CDT FRI APR 21 2006 .DISCUSSION... MESOSCALE UPDATE...VERY COMPLEX MESOSCALE SITUATION THIS MORNING...AND NONE OF THE MODELS ARE HANDLING IT WELL. 13Z SFC ANALYSIS SHOWED A MESOLOW OVER SE TX NW OF KPOE...WITH A WELL DEFINED OUTFLOW BOUNDARY EXTENDING ENE FROM IT ALONG A WISNER LA...TO KJAN...TO MACON LINE. OUTFLOW BOUNDARY IS WELL DEFINED IN VISIBLE SATELLITE IMAGERY...AND KGWX 88D VWP SHOWS IT TO BE 3-4 KFT THICK...SO EXPECT IT TO PLAY A SIGNIFICANT ROLE IN WX INTO THE AFTERNOON. KPOE 88D DATA SHOWS A WELL DEFINED SUPERCELL/BOW ECHO STRUCTURE HAS BEEN INTENSIFYING N OF KPOE. THIS ACTIVITY IS AHEAD OF MESOSCALE CONVECTIVE VORT WHICH SHOWS UP IN WATER VAPOR IMAGERY...AND LEDBETTER TX PROFILER SHOWS 40-50 KT MID LEVEL REAR INFLOW JET PUNCHING INTO MCS WHICH NOT SURPRISINGLY NONE OF THE MODELS SHOW. EXPECT AS THIS SYSTEM PROPAGATES DOWNSTREAM TOWARD SOUTHERN PART OF FORECAST AREA...WILL SEE CONVECTION CONTINUE TO INCREASE AND INTENSIFY. MODIFIED 12Z JAN RAOB SHOWS MLCAPE VALUES AROUND 1300 J/KG EVEN WITH TEMPERATURES ONLY IN MID 70S...SO EVEN WITH WIDESPREAD HIGH CLOUDINESS MOVING IN EXPECT ENOUGH INSTABILITY TO FUEL SEVERE STORMS. RUC MODEL SEEMS TO BE UNDERPLAYING THIS AVAILABLE INSTABILITY BASED ON MODIFIED SOUNDINGS. TIMING PLACES CURRENT STG ACTIVITY OVER LA INTO OUR SW PARISHES BETWEEN 15Z AND 16Z...AND EXPECT ADDITIONAL ACTIVITY TO DEVELOP AHEAD OF IT PARTICULARLY ALONG OUTFLOW BOUNDARY EXTENDING ACROSS CENTRAL SECTIONS. THIS WELL DEFINED BOUNDARY MAY PROVIDE A FOCUS FOR ENHANCED ACTIVITY TODAY. SPC WRF MODEL DOES SEEM TO HAVE SOMEWHAT OF A HANDLE ON CURRENT MCS OVER TX/LA...AND IT SHOWS STRONG INCREASE IN CONVECTION LATE MORNING/EARLY AFTERNOON ACROSS CENTRAL AND SOUTHERN SECTIONS OF AREA...WITH INITIAL MODE APPEARING TO BE SUPERCELLS/BOWING LINE SEGMENTS. THIS SEEMS REASONABLE GIVEN 40-50 KT OF 0-6 KM SHEAR OVER AREA. EVENTUALLY SHOULD SEE CONGLOMERATION INTO MORE OF A SQUALL LINE WHICH SHOULD MOVE ACROSS AREA...WRF SEEMS A BIT SLOW IN MOVING IT ACROSS AREA BASED ON CURRENT TRENDS...AND EXPECT THAT MAIN THREAT OF SVR WX SHOULD COME TO AN END ACROSS THE ENTIRE AREA BY EARLY EVENING. AS FAR AS SEVERE WEATHER TYPE...STEEP MID LEVEL LAPSE RATES...650 TO 500 MB LAPSE RATES LOOK TO BE IN 7-8 DEG RANGE WITH SIGNIFICANT CAPE IN THIS LAYER...WOULD FAVOR SOME QUITE LARGE HAIL IN ADDITION TO WIND DAMAGE. COULD BE SOME SIGNIFICANT REPORTS OF BOTH...PARTICULARLY ACROSS SOUTHERN SECTIONS IF ORGANIZED SUPERCELLS/BOWS CAN MAINTAIN OR DEVELOP OUT OF ACTIVITY CURRENTLY OVER LA AND NEAR CONVECTIVE BOUNDARY ACROSS CENTRAL SECTIONS. AS FAR AS TORNADIC POTENTIAL...LOW LEVEL SHEAR IS RELATIVELY WEAK...BUT COULD BE A BIT MORE RISK IF ANY SUPERCELL DEVELOPS IN VICINITY OF CONVECTIVE BOUNDARY WHERE LOW LEVEL VORTICITY WOULD BE ENHANCED. CURRENT HWO SHOWS LESS OF A THREAT OVER DELTA...AND THIS SEEMS REASONABLE GIVEN DEPTH OF COOLER/MORE STABLE LAYER OVER AREA AND NORTHERN STRATIFORM SIDE OF MCS STREAMING TOWARD THAT AREA. IF ANY RISK DOES EXIST THERE...IT WOULD LIKELY BE FROM ELEVATED HAILERS. && .JAN WATCHES/WARNINGS/ADVISORIES... MS...NONE. LA...NONE. AR...NONE. && 08
Hazardous weather outlook, Apr 21, 5:40 AM CDT, 7 hours 43 minutes before
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</html>In the hours before
Special weather statement, Apr 21, 12:41 PM CDT, 42 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE JACKSON MS 1241 PM CDT FRI APR 21 2006 MSZ043-211815- MADISON MS- 1241 PM CDT FRI APR 21 2006 ...STRONG THUNDERSTORM OVER WESTERN MADISON COUNTY... AT 1240 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM OVER WESTERN MADISON COUNTY...JUST EAST OF FLORA. THE STORM WAS MOVING NORTHEAST AT 20 MPH. THIS STORM WILL PRODUCE FREQUENT LIGHTNING...VERY HEAVY RAINFALL...SMALL HAIL...AND WIND GUSTS TO 45 MPH AS IT MOVES ACROSS WESTERN MADISON COUNTY THROUGH 1 PM. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT FOR THE AREA UNTIL 4 PM. PEOPLE SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER. AG
The office that day
Everything else NWS Jackson, MS issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 20, 11:09 PM CDT | Severe Thunderstorm Warning | JAN | Sunflower | 12 min |
| Apr 21, 12:49 PM CDT | Severe Thunderstorm Warning | JAN | Madison | 41 min |
| Apr 21, 1:31 PM CDT | Severe Thunderstorm Warning | JAN | Madison | 44 min |
| Apr 21, 2:12 PM CDT | Severe Thunderstorm Warning | JAN | Scott | 35 min |
| Apr 21, 2:13 PM CDT | Severe Thunderstorm Warning | JAN | Lincoln | 33 min |
| Apr 21, 2:25 PM CDT | Severe Thunderstorm Warning | JAN | Forrest, Lamar | 50 min |
| Apr 21, 3:53 PM CDT | Severe Thunderstorm Warning | JAN | Jasper, Smith | 37 min |
Nearby
Severe Thunderstorm Warnings in Mississippi, 2006Every severe thunderstorm warning in 2006
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.