Alert archive / Mississippi / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 203, NWS Memphis, TN
NWS Memphis, TN issued this severe thunderstorm warning at Jul 12, 2020, 9:38 AM CDT for Alcorn County, Tishomingo County, Mississippi; Hardin County, McNairy County, Tennessee. It was in force for 52 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
- Jul 12, 2020, 9:38 AM CDT (14:38 UTC)
- Expired
- Jul 12, 2020, 10:30 AM CDT
- In force
- 52 min
- Issued by
- NWS Memphis, TN
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Alcorn County, MS, Tishomingo County, MS, Hardin County, TN, McNairy County, TN
The radar
The Columbus AFB radar (KGWX), 123 km from the middle of the area, began a volume at 14:42 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
Nashville Metro, TN (KBNA), launched 12:00Z, 2.6 hours before the alert went out and 205 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 852 m above ground
- 0-6 km bulk shear
- 54 kt
- 0-1 km storm-relative helicity
- 188 m²/s²
- 0-3 km storm-relative helicity
- 332 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Memphis, TN wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 12, 6:35 AM CDT, 3 hours 3 minutes earlier.
Area forecast discussion, Jul 12, 6:35 AM CDT, 3 hours 3 minutes before
Area Forecast Discussion National Weather Service Memphis TN 635 AM CDT Sun Jul 12 2020 .UPDATE... Updated 12z Aviation Discussion. && .PREV DISCUSSION... /issued 312 AM CDT Sun Jul 12 2020/ DISCUSSION... SKies are mostly clear across the Mid-South early this morning with temperatures ranging from the mid 70s to lower 80s. An area of thunderstorms has been moving across portions of western Kentucky and has begun to move into middle Tennessee. In addition, a weak frontal boundary extends across southern Missouri through northwest Oklahoma and into southeast New Mexico. The frontal boundary will drop further south into the Mid-South. This front will provide a focus for additional thunderstorm development later today. Temperatures will be a little cooler today with this boundary moving into the region with highs in the upper 80s to around 90. With slightly cooler temperatures expected today, heat index values should remain around 100 degrees this afternoon so a Heat Advisory is not needed at this time. The frontal boundary will continue to push south into north Mississippi tonight with any thunderstorms that develop confined to southern sections of the Mid-South. Temperatures will be seasonally warm tonight with lows Monday morning in the upper 60s to lower 70s. By Monday, high pressure will build into the region bringing dry weather to the Mid-South. Temperatures will be a little warmer on Monday with highs in the upper 80s to lower 90s. Heat index values should remain around 100 degrees on Monday. High pressure will remain over the region on Tuesday bringing another day of dry weather. Temperatures will be even warmer on Tuesday with highs in the low to mid 90s. In addition, heat index values should exceed 105 degrees over southern and western sections of the Mid-South so a Heat Advisory may be needed. By Wednesday, a new cold front will move into Missouri. Some of the thunderstorms that develop ahead of this front may reach northern and eastern sections of the Mid-South Wednesday or Wednesday night. The front will remain stalled out over central Missouri on Thursday and Friday with a few thunderstorms possibly reaching the Mid- South during the late morning or afternoon hours both days. By Saturday, the frontal boundary will have fallen apart leaving the Mid-South dry. Temperatures will remain on the hot side from Wednesday through Saturday with afternoon highs in the mid 90s. Heat index values across the much of the Mid-South will be in the 105-110 range each day. ARS && .AVIATION... /12z TAFs/ Made some big changes to the 06z TAF set. Short range models indicate TSRA not really affecting the TAF sites, so have taken out the TEMPO group. There's still a chance for shower development at each TAF site so still have VCSH through the morning. TUP has the best chance for seeing TSRA but confidence is low. The other change made was to winds. Winds will begin to gust to 16/15kts later this afternoon and persist through the evening. They will quickly become calm around 01z. SGW && .MEG WATCHES/WARNINGS/ADVISORIES... AR...None. MO...None. MS...None. TN...None. &&
Hazardous weather outlook, Jul 12, 8:59 AM CDT, 39 minutes before
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Special weather statement, Jul 12, 9:04 AM CDT, 34 minutes before
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</html>The office that day
Everything else NWS Memphis, TN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 12, 7:02 AM CDT | Special Weather Statement | MEG | Calhoun | 13 min |
| Jul 12, 7:16 AM CDT | Special Weather Statement | MEG | Calhoun | 29 min |
| Jul 12, 10:18 AM CDT | Special Weather Statement | MEG | Alcorn | 27 min |
| Jul 12, 10:28 AM CDT | Special Weather Statement | MEG | Prentiss, Tishomingo | 32 min |
| Jul 12, 10:58 AM CDT | Special Weather Statement | MEG | Itawamba, Lee, Prentiss, Tishomingo | 47 min |
| Jul 12, 11:03 AM CDT | Special Weather Statement | MEG | Benton, Tippah, Union | 42 min |
| Jul 12, 11:44 AM CDT | Special Weather Statement | MEG | Itawamba, Lee | 31 min |
| Jul 12, 12:13 PM CDT | Special Weather Statement | MEG | Chickasaw, Itawamba, Lee, Monroe, Pontotoc | 32 min |
| Jul 12, 12:41 PM CDT | Special Weather Statement | MEG | Monroe | 34 min |
| Jul 12, 6:17 AM CDT | Special Weather Statement | MEG | Benton, Henry | 28 min |
| Jul 12, 6:54 AM CDT | Special Weather Statement | MEG | Benton, Henry, Weakley | 36 min |
| Jul 12, 6:56 AM CDT | Special Weather Statement | MEG | Decatur, Henderson | 34 min |
| Jul 12, 6:58 AM CDT | Special Weather Statement | MEG | Dyer, Lake | 32 min |
| Jul 12, 7:29 AM CDT | Special Weather Statement | MEG | Benton, Henry, Weakley | 46 min |
| Jul 12, 7:38 AM CDT | Special Weather Statement | MEG | Gibson, Lake, Obion | 37 min |
| Jul 12, 7:54 AM CDT | Special Weather Statement | MEG | Hardin | 51 min |
| Jul 12, 8:02 AM CDT | Areal Flood Advisory | MEG | Benton, Henry, Weakley | 3 hr |
| Jul 12, 8:22 AM CDT | Areal Flood Advisory | MEG | Benton, Carroll, Decatur, Gibson, Henderson, Henry and 2 more | 3 hr |
| Jul 12, 8:26 AM CDT | Flash Flood Warning | MEG | Benton, Carroll, Henry, Weakley | 3 hr |
| Jul 12, 8:32 AM CDT | Special Weather Statement | MEG | Carroll, Decatur, Henderson | 43 min |
| Jul 12, 8:41 AM CDT | Severe Thunderstorm Warning | MEG | Carroll, Chester, Decatur, Henderson, Madison | 34 min |
| Jul 12, 9:04 AM CDT | Special Weather Statement | MEG | Chester, Madison | 26 min |
| Jul 12, 9:15 AM CDT | Special Weather Statement | MEG | Hardin, McNairy | 45 min |
| Jul 12, 10:40 AM CDT | Areal Flood Advisory | MEG | Hardin | 2 hr |
| Jul 12, 6:51 PM CDT | Special Weather Statement | MEG | Benton | 24 min |
| Jul 12, 6:20 AM CDT | Special Weather Statement | MEG | Clay | 25 min |
Nearby
Severe Thunderstorm Warnings in Mississippi, 2020Severe Thunderstorm Warnings in Tennessee, 2020Every severe thunderstorm warning in 2020
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.