Alert archive / Mississippi / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 225, NWS Jackson, MS
NWS Jackson, MS issued this severe thunderstorm warning at Dec 21, 1990, 2:51 PM CST for Humphreys County, Mississippi. It was in force for 39 min. 1 report came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Dec 21, 1990, 2:51 PM CST (20:51 UTC)
- Expired
- Dec 21, 1990, 3:30 PM CST
- In force
- 39 min
- Issued by
- NWS Jackson, MS
- Area
- Whole counties
County Humphreys County, MS
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Dec 21, 3:30 PM CST | Tornado F1 | Humphreys, MS |
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. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.
The nearest sounding before it
Jackson, MS (KJAN), launched 12:00Z, 8.9 hours before the alert went out and 99 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
- 572 J/kg
- Mixed-layer CIN
- -34 J/kg
- Mixed-layer LCL
- 685 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 248 m²/s²
- 0-3 km storm-relative helicity
- 274 m²/s²
- Significant tornado parameter
- 0.6
- Supercell composite
- 4.7
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
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.
In the hours before
Special weather statement, Dec 21, 12:01 PM CST, 2 hours 50 minutes before
MSZALL-220000- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE JACKSON MS NOON CST FRI DEC 21 1990 ...SEVERE WEATHER...INCLUDING TORNADOES...POSSIBLE AGAIN THIS AFTERNOON AND TONIGHT ACROSS MISSIS
Special weather statement, Dec 21, 12:03 PM CST, 2 hours 48 minutes before
MSZALL-220000- SPECIAL WEATHER STATEMENT ...CORRECTED... NATIONAL WEATHER SERVICE JACKSON MS NOON CST FRI DEC 21 1990 ...SEVERE WEATHER...INCLUDING TORNADOES...POSSIBLE AGAIN THIS AFTERNOON AND TONIGHT ACROSS MISSISSIPPI... ...FLASH FLOOD WATCH IN EFFECT THIS AFTERNOON FOR NORTHERN THIRD OF MISSISSIPPI... ...ARCTIC AIR MASS TO ENTER NORTHWEST MISSISSIPPI TONIGHT AND ALL BUT EXTREME SOUTHEAST MISSISSIPPI ON SATURDAY... AN EXPLOSIVE SEVERE WEATHER SITUATION IS SETTING UP OVER MISSISSIPPI AS NEAR RECORD HIGH TEMPERATURES ARE CREATING VERY UNSTABLE CONDITIONS OVER THE AREA. STRONG WINDS IN THE UPPER-LEVELS OF THE ATMOSPHERE AND SEVERAL STRONG UPPER-LEVEL DISTURBANCES WILL FURTHER ENHANCE THE SEVERE WEATHER POTENTIAL BY THIS AFTERNOON. SEVERE WEATHER WAS ALREADY BREAKING OUT OVER LOUISIANA AND WILL LIKELY MOVE INTO SECTIONS OF AT LEAST WESTERN MISSISSIPPI THIS AFTERNOON. TORNADOES ARE A STRONG POSSIBILITY AS THIS WEATHER SYSTEM APPROACHES FROM THE WEST. PARTS OF NORTHERN MISSISSIPPI RECEIVED HEAVY RAINS YESTERDAY AND WITH THE THREAT OF MORE HEAVY RAINS THIS AFTERNOON...A FLASH FLOOD WATCH REMAINS IN EFFECT FOR THE NORTHERN THIRD OF THE STATE. A VERY COLD ARCTIC AIR MASS CONTINUES TO SLIDE SOUTHEASTWARD INTO NORTHWESTERN ARKANSAS AND NORTHEASTERN TEXAS EARLY THIS AFTERNOON. THIS AIR MASS IS NOW EXPECTED TO ENTER SECTIONS OF NORTHWEST MISSISSIPPI LATE TONIGHT...AND ALL BUT PERHAPS EXTREME SOUTHEAST MISSISSIPPI DURING THE DAY SATURDAY. TEMPERATURES WILL DROP SHARPLY INTO THE 30S AND 40S AS THE ARCTIC FRONT PLOWS THROUGH THE STATE. LINGERING PRECIPITATION SATURDAY AFTERNOON INTO SUNDAY WILL PROBABLY BE IN THE FORM OF FREEZING RAIN AND DRIZZLE. AT THIS TIME...THIS FREEZING PRECIPITATION IS EXPECTED TO BE PATCHY...BUT COULD STILL MAKE TRAVELING DIFFICULT DURING THE UPCOMING CHRISTMAS WEEKEND. THOSE PLANNING TRIPS THIS WEEKEND ARE ADVISED TO KEEP UP WITH THE LASTEST FORECASTS AND STATEMEDNTS.
The office that day
Everything else NWS Jackson, MS issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 21, 1:01 PM CST | Tornado Warning | JAN | Holmes, Yazoo | 44 min |
| Dec 21, 1:32 PM CST | Severe Thunderstorm Warning | JAN | Washington | 28 min |
| Dec 21, 1:44 PM CST | Tornado Warning | JAN | Carroll | 31 min |
| Dec 21, 1:55 PM CST | Tornado Warning | JAN | Washington | 35 min |
| Dec 21, 2:00 PM CST | Tornado Warning | JAN | Sharkey | 30 min |
| Dec 21, 2:07 PM CST | Tornado Warning | JAN | Claiborne, Warren | 53 min |
| Dec 21, 2:18 PM CST | Tornado Warning | JAN | Grenada, Montgomery | 42 min |
| Dec 21, 2:31 PM CST | Severe Thunderstorm Warning | JAN | Sunflower | 29 min |
| Dec 21, 2:44 PM CST | Tornado Warning | JAN | Calhoun, Yalobusha | 31 min |
| Dec 21, 2:45 PM CST | Severe Thunderstorm Warning | JAN | Leflore, Tallahatchie | 30 min |
| Dec 21, 3:00 PM CST | Tornado Warning | JAN | Warren, Yazoo | 45 min |
| Dec 21, 3:10 PM CST | Tornado Warning | JAN | Humphreys | 35 min |
| Dec 21, 3:25 PM CST | Tornado Warning | JAN | Holmes, Leflore | 35 min |
| Dec 21, 3:46 PM CST | Severe Thunderstorm Warning | JAN | Yazoo | 44 min |
| Dec 21, 3:46 PM CST | Tornado Warning | JAN | Holmes | 44 min |
| Dec 21, 3:55 PM CST | Tornado Warning | JAN | Carroll, Grenada | 50 min |
| Dec 21, 4:02 PM CST | Tornado Warning | JAN | Issaquena | 13 min |
| Dec 21, 4:16 PM CST | Severe Thunderstorm Warning | JAN | Sharkey, Washington | 29 min |
| Dec 21, 4:25 PM CST | Tornado Warning | JAN | Issaquena, Sharkey, Warren | 50 min |
| Dec 21, 4:26 PM CST | Tornado Warning | JAN | Claiborne, Jefferson | 49 min |
| Dec 21, 4:32 PM CST | Tornado Warning | JAN | Holmes | 43 min |
| Dec 21, 4:47 PM CST | Tornado Warning | JAN | Calhoun, Grenada | 43 min |
| Dec 21, 4:52 PM CST | Tornado Warning | JAN | Humphreys, Sunflower | 53 min |
| Dec 21, 4:59 PM CST | Tornado Warning | JAN | Warren | 46 min |
| Dec 21, 5:07 PM CST | Tornado Warning | JAN | Attala, Carroll, Montgomery | 53 min |
| Dec 21, 5:36 PM CST | Tornado Warning | JAN | Calhoun, Webster | 54 min |
| Dec 21, 5:41 PM CST | Tornado Warning | JAN | Carroll | 49 min |
| Dec 21, 5:46 PM CST | Tornado Warning | JAN | Warren | 44 min |
Nearby
Severe Thunderstorm Warnings in Mississippi, 1990Every severe thunderstorm warning in 1990
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.