Alert archive / Mississippi / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 228, NWS Jackson, MS
NWS Jackson, MS issued this severe thunderstorm warning at May 4, 2009, 6:20 AM CDT for Forrest County, Lamar County, Mississippi. It was in force for 40 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
- May 4, 2009, 6:20 AM CDT (11:20 UTC)
- Expired
- May 4, 2009, 7:00 AM CDT
- In force
- 40 min
- Issued by
- NWS Jackson, MS
- Area
- Storm-based polygon
Counties Forrest County, MS, Lamar County, MS
The radar
The Mobile radar (KMOB), 123 km from the middle of the area, began a volume at 11:19 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
Slidell Radar S, LA (KSIL), launched 00:00Z, 11.3 hours before the alert went out and 110 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
- 332 J/kg
- Mixed-layer CIN
- -105 J/kg
- Mixed-layer LCL
- 1021 m above ground
- 0-6 km bulk shear
- 59 kt
- 0-1 km storm-relative helicity
- 25 m²/s²
- 0-3 km storm-relative helicity
- 169 m²/s²
- Significant tornado parameter
- -0.1
- Supercell composite
- -1.0
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 May 4, 4:30 AM CDT, 1 hour 50 minutes earlier.
Area forecast discussion, May 4, 4:30 AM CDT, 1 hour 50 minutes before
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</html>Hazardous weather outlook, May 4, 5:50 AM CDT, 30 minutes before
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Special weather statement, May 4, 12:20 AM CDT, 6 hours before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE JACKSON MS 1220 AM CDT MON MAY 4 2009 MSZ064>066-040615- COVINGTON MS-JONES MS-JEFFERSON DAVIS MS- 1220 AM CDT MON MAY 4 2009 ...COMPLEX OF STRONG THUNDERSTORMS FROM BASSFIELD TO COLLINS MOVING EAST AT 40 MPH... A COMPLEX OF STRONG THUNDERSTORM CAPABLE OF PRODUCING VERY HEAVY RAINFALL OF 1 TO 2 INCHES...FREQUENT LIGHTNING STRIKES AND PEA SIZE HAIL WAS LOCATED 8 MILES EAST OF CARSON AT 1217 AM CDT...MOVING EAST AT 40 MPH. THESE STORMS SHOULD CROSS THE COLLINS TO SEMINARY AREAS BY 1230 AM AND PUSH TOWARD THE ELLISVILLE TO LAUREL AREAS BY 1 AM WITH WIND GUSTS OF 30 TO 40 MPH POSSIBLE. HIGH WINDS CAN BRING DOWN TREES AND LARGE LIMBS RESULTING IN SERIOUS INJURY OR PROPERTY DAMAGE. EXERCISE EXTREME CAUTION WHEN OUTDOORS DURING SUCH STRONG WINDS...AND BE ESPECIALLY AWARE OF OLDER TREES. PEOPLE IN EAST CENTRAL JEFFERSON DAVIS...JONES AND SOUTHERN COVINGTON COUNTIES SHOULD MONITOR THIS STORM CLOSELY. 40
Special weather statement, May 4, 12:39 AM CDT, 5 hours 41 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE JACKSON MS 1239 AM CDT MON MAY 4 2009 MSZ073-074-040635- FORREST MS-LAMAR MS- 1239 AM CDT MON MAY 4 2009 ...COMPLEX OF STRONG THUNDERSTORMS NEAR SUMRALL BUILDING EAST SOUTHEAST AT 40 MPH... A COMPLEX OF STRONG THUNDERSTORMS CAPABLE OF PRODUCING VERY HEAVY RAINFALL OF 1 TO 2 INCHES...FREQUENT LIGHTNING STRIKES AND PEA SIZE HAIL WAS LOCATED NEAR SUMRALL AT 1237 AM CDT...MOVING EAST SOUTHEAST AT 40 MPH. THESE STORMS SHOULD CROSS NORTHERN LAMAR COUNTY BY 100 AM AND PUSH TOWARD THE HATTIESBURG AND PETAL AREAS BEFORE 130 AM WITH WIND GUSTS OF 30 TO 40 MPH POSSIBLE. HIGH WINDS CAN BRING DOWN TREES AND LARGE LIMBS RESULTING IN SERIOUS INJURY OR PROPERTY DAMAGE. EXERCISE EXTREME CAUTION WHEN OUTDOORS DURING SUCH STRONG WINDS...AND BE ESPECIALLY AWARE OF OLDER TREES. PEOPLE IN NORTHERN LAMAR AND NORTHERN FORREST COUNTIES SHOULD MONITOR THIS STORM CLOSELY. 40
Local storm report, May 4, 2:22 AM CDT, 3 hours 58 minutes before
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</html>Special weather statement, May 4, 5:39 AM CDT, 41 minutes before
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</html>The office that day
Everything else NWS Jackson, MS issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 3, 8:52 PM CDT | River Flood Warning | JAN | Yazoo | 37 hr |
| May 3, 8:54 PM CDT | River Flood Warning | JAN | Carroll, Leflore | 24 hr |
| May 4, 1:05 AM CDT | Severe Thunderstorm Warning | JAN | Forrest, Lamar | 40 min |
| May 4, 1:20 AM CDT | Flash Flood Warning | JAN | Covington, Forrest, Jones, Lamar | 5 hr |
| May 4, 1:23 AM CDT | Tornado Warning | JAN | Forrest | 22 min |
| May 4, 3:22 AM CDT | Flash Flood Watch | JAN | Covington, Forrest, Jefferson Davis, Jones, Lamar, Lawrence and 2 more | 12 hr |
| May 4, 4:07 PM CDT | River Flood Warning | JAN | Adams, Wilkinson | 39 days |
Nearby
Severe Thunderstorm Warnings in Mississippi, 2009Every severe thunderstorm warning in 2009
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.