Alert archive / Mississippi / Special Weather Statements in 2021
Special Weather Statement, NWS Jackson, MS
NWS Jackson, MS issued this special weather statement at Jul 24, 2021, 5:14 PM CDT for Montgomery County, Mississippi. It was in force for 31 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jul 24, 2021, 5:14 PM CDT (22:14 UTC)
- Expired
- Jul 24, 2021, 5:45 PM CDT
- In force
- 31 min
- Issued by
- NWS Jackson, MS
County Montgomery County, MS
The radar
The Columbus AFB radar (KGWX), 124 km from the middle of the area, began a volume at 22:15 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
Jackson, MS (KJAN), launched 12:00Z, 10.2 hours before the alert went out and 125 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
- 1962 J/kg
- Mixed-layer CIN
- -20 J/kg
- Mixed-layer LCL
- 869 m above ground
- 0-6 km bulk shear
- 8 kt
- 0-1 km storm-relative helicity
- 1 m²/s²
- 0-3 km storm-relative helicity
- 5 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
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</html>What forecasters said that day
The local office's own words before this special weather statement 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 special weather statement went out at Jul 24, 2:48 PM CDT, 2 hours 26 minutes earlier.
Area forecast discussion, Jul 24, 2:48 PM CDT, 2 hours 26 minutes before
Area Forecast Discussion
National Weather Service Jackson MS
248 PM CDT Sat Jul 24 2021
.DISCUSSION...
Tonight and tomorrow...
Upper level ridging over much of the southern half of the CONUS this
afternoon is the primary driver of the forecast in the short term...
and well into the mid range. Hot and humid conditions will continue
with low level moisture being reinforced by late afternoon and early
evening showers/convection. Temps climbing into the 90s and
dewpoints in the mid to upper 70s early on resulted in plenty of
CAPE... but lapse rates in the midlevels were less than ideal. The
storms briefly go up, but rarely more than 40-45dBZ over 24kft. This
has been the trend under this ridge, with warm air still being
ushered in the mid levels and sfc temps on a slow climb.
Overnight tonight, the enhanced llvl RH will result in some patchy
fog in low lying areas. With some concerns for how much mixing out
will actually be achieved under current cloud cover...have added a
patchy mention in the grids...otherwise a hot and muggy overnight
with lows in the mid to upper 70s. Tomorrow will bring much of the
same, and temps and heat indices on par with todays forecast.
Exception may be in the east where the cloud cover and anticipated
showers/thunder will be more of an impact. Have gone ahead with a
heat advisory for along and west of a line from Grenada to
Hattiesburg, as well as all of the ArkLaMiss region. /HJS/
Monday-next Friday...
Warmth & humidity will be the main concern through the week, with
scattered diurnal showers & storms possible through the period. Heat
stress will be elevated at the start but continued heat stress is
possible through the week.
Monday-Tuesday: At the start, the ArkLaMiss will remain on the E
periphery of strong mean ridge over the Intermountain West. This
will lead to continued low-level warmth, with thermal profiles
progged around low-mid 20 degrees C at 925mb. Continued above normal
warmth into the low-mid 90s is expected. Deep moisture around 2+
inches & in the low-levels will keep dewpoints in upper 70s to near
80 degrees at times. Continued elevated heat stress is expected
between 105-110 degrees F to the W of I-55 & near 105 degrees to the
E, outside of Meridian area which could be slightly lower. Rain
chances Mon. will be somewhat scattered. Perturbed E-NE flow could
bring shortwave ascent/increased low-level convergence more into
Tuesday, leading to slightly better convective coverage. Main
adjustments to the HWO were to expand the limited to encompass the
Hwy 82/Golden Triangle area. Decided to leave this through Tuesday.
Tuesday becomes more of a question mark with better convective
coverage & highs a touch lower. However, will leave it for now for
messaging purposes & any that occurs by mid-morning, in addition to
potential lower convective coverage than anticipated. Monday has
best chance for heat advisory potential & could reach this by mid-
morning to early afternoon. Flow will be subtle & lapse rates
weaker. However, with such high low-level moisture/Theta E, some
microburst/gusty wind potential & heavy downpours with isolated
flash flooding can't be ruled out.
Wednesday-Friday: Expect mean ridge to build E out of the lee of the
Rockies into the central Plains & deepen, leading to continued
warmth in the ArkLaMiss through mid-late week. A weak upper low in
the central-W Gulf will wash out while elevated moisture will remain
through late week. As a mean trough remains locked in over the Great
Lakes/Mid-Atlantic/NE, this will drive a weak front off to our NE.
This could help any of the lingering deep 2+ inch PWs to propagate
to the S & E, bringing best scattered-likely rain & storm chances S
of I-20 Wed. & more into Hwy 84/98 corridors into Thurs-Fri. With
low-level heat & moisture remaining, heat stress will remain a
concern through mid-late next week. Advertisement in the
HWO/graphics & potential heat advisories will likely be needed as we
get closer. Stay cool & hydrated & take all heat safety precautions
this week. Microburst/gusty wind potential & isolated heavy
downpours are possible. With limited lapse rates aloft, any stronger
storms will be more isolated in coverage. /DC/
&&
.AVIATION...
18Z TAF discussion:
VCSH added to TAFs as the cu field has expanded quite a bit...up
to VCTS in MEI with thunder in proximity. VCTS across the board
later this afternoon as some sct convection strengthens.
Overnight, higher dewpoints potentially in the north and east in
model data has better chances for MVFR/IFR vis...but given the
showers currently invof MEI, will need to watch them for fog as
well. /HJS/
&&
.PRELIMINARY POINT TEMPS/POPS...
Jackson 76 94 76 94 / 17 37 9 58
Meridian 75 93 75 94 / 19 44 9 50
Vicksburg 77 95 77 95 / 6 24 9 48
Hattiesburg 76 93 75 95 / 22 54 7 43
Natchez 75 94 75 94 / 7 28 10 51
Greenville 76 95 76 94 / 8 23 9 48
Greenwood 75 95 75 95 / 9 29 8 57
&&
.JAN WATCHES/WARNINGS/ADVISORIES...
MS...Heat Advisory until 7 PM CDT this evening for MSZ018-019-025>066-
072>074.
Heat Advisory from 10 AM to 7 PM CDT Sunday for MSZ018-019-
025>028-034>037-040>044-047>050-053>056-059>065-072>074.
LA...Heat Advisory until 7 PM CDT this evening for LAZ007>009-015-016-
023>026.
Heat Advisory from 10 AM to 7 PM CDT Sunday for LAZ007>009-015-
016-023>026.
AR...Heat Advisory until 7 PM CDT this evening for ARZ074-075.
Heat Advisory from 10 AM to 7 PM CDT Sunday for ARZ074-075.
&&
HJS/DCHazardous weather outlook, Jul 24, 3:50 PM CDT, 1 hour 24 minutes before
Hazardous Weather Outlook National Weather Service Jackson MS 350 PM CDT Sat Jul 24 2021 ARZ074-075-LAZ007>009-015-016-023>026-MSZ018-019-025>028-034>037- 040>044-047>050-053>056-059>066-072>074-252100- Ashley-Chicot-Morehouse-West Carroll-East Carroll-Richland- Madison LA-Franklin LA-Catahoula-Tensas-Concordia-Bolivar- Sunflower-Leflore-Grenada-Carroll-Montgomery-Washington-Humphreys- Holmes-Attala-Issaquena-Sharkey-Yazoo-Madison MS-Leake-Warren- Hinds-Rankin-Scott-Claiborne-Copiah-Simpson-Smith-Jefferson-Adams- Franklin MS-Lincoln-Lawrence-Jefferson Davis-Covington-Jones- Marion-Lamar-Forrest- 350 PM CDT Sat Jul 24 2021 This hazardous weather outlook is for portions of southeast Arkansas, northeast Louisiana, central Mississippi, north central Mississippi, northwest Mississippi, south central Mississippi, and west central Mississippi. .DAY ONE...Tonight and Sunday DANGEROUS HEAT THREAT...Elevated TIMING...Sunday Sunday, high temperatures climbing in the mid 90s will combine with increased humidity, leading to dangerous heat stress. Heat indices will climb to the 105 to 110 degree range for central to western portions of the area Sunday. Heat exhaustion will be likely with outdoor activity. Residents are urged to use caution if spending time outdoors. (https://www.weather.gov/images/jan/graphicast/1.png) .DAYS TWO THROUGH SEVEN...Sunday night through Friday High temperatures climbing in the low-mid 90s will combine with increased humidity, leading to dangerous heat stress Monday through Tuesday. Heat indices will be between 105 to 110 degree range for central to western portions of the area into early next week. Heat exhaustion will be likely with outdoor activity. Residents are urged to use caution if spending time outdoors. (https://www.weather.gov/images/jan/graphicast/2.png) .SPOTTER CALL TO ACTION STATEMENT... The activation of storm spotters, HAM radio operators, and emergency management personnel in support of severe weather operations is not expected through next Friday. MSZ029>033-038-039-045-046-051-052-057-058-252100- Webster-Clay-Lowndes-Choctaw-Oktibbeha-Winston-Noxubee-Neshoba- Kemper-Newton-Lauderdale-Jasper-Clarke- 350 PM CDT Sat Jul 24 2021 This hazardous weather outlook is for portions of central Mississippi, east central Mississippi, north central Mississippi, and northeast Mississippi. .DAY ONE...Tonight and Sunday DANGEROUS HEAT THREAT...Limited TIMING...Sunday Sunday, high temperatures climbing in the low-mid 90s will combine with increased humidity, leading to increased heat stress. Heat indices will be around 105 degree range for eastern portions of the area Sunday. Residents are urged to use caution if spending time outdoors. (https://www.weather.gov/images/jan/graphicast/1.png) .DAYS TWO THROUGH SEVEN...Sunday night through Friday High temperatures climbing in the low-mid 90s will combine with increased humidity, leading to dangerous heat stress Monday through Tuesday. Heat indices will be between 105 to 110 degree range for central to western portions of the area into early next week. Heat exhaustion will be likely with outdoor activity. Residents are urged to use caution if spending time outdoors. (https://www.weather.gov/images/jan/graphicast/2.png) .SPOTTER CALL TO ACTION STATEMENT... The activation of storm spotters, HAM radio operators, and emergency management personnel in support of severe weather operations is not expected through next Friday. 23 && ...HAZARD LEGEND... *DANGEROUS HEAT* Extreme...Extreme heat is expected with peak heat index values in excess of 110 degrees for multiple days. Heat stroke continues to be a major concern. Significant...Dangerous heat expected with peak heat index values in excess of 110 degrees. Heat stroke will be a significant concern. Elevated...Dangerous heat likely with peak heat index values ranging from 106 to 110 degrees. Heat exhaustion will be likely. Limited...Caution is advised for possible dangerous heat as heat index values peak near 105 degrees. Heat exhaustion will be possible. ...USEFUL WEATHER WEB PAGES (URLS)... NWS JAN Home page... https://www.weather.gov/jan Stay Aware, Stay Safe NWS JAN Briefing Page... https://www.weather.gov/jan/safe Latest Weather Briefing... https://www.weather.gov/jan/weather_briefing Tropical page... https://www.weather.gov/srh/tropical?office=jan National Hurricane Center Home Page... https://www.nhc.noaa.gov/ Find NWS JAN on Facebook... https://www.facebook.com/NWSJacksonMS Follow NWS JAN on Twitter... @NWSJacksonMS Follow NWS JAN on Youtube... https://www.youtube.com/user/NWSJacksonMiss
In the hours before
Special weather statement, Jul 24, 1:02 PM CDT, 4 hours 12 minutes before
Special Weather Statement National Weather Service Jackson MS 102 PM CDT Sat Jul 24 2021 MSZ046-052-241830- Kemper MS-Lauderdale MS- 102 PM CDT Sat Jul 24 2021 ...A STRONG THUNDERSTORM WILL AFFECT SOUTH CENTRAL KEMPER AND NORTHEASTERN LAUDERDALE COUNTIES UNTIL 130 PM CDT... At 101 PM CDT, Meteorologists were tracking a strong thunderstorm over Meridian Station, moving south at 15 mph. Winds in excess of 40 mph will be possible with this storm. This strong thunderstorm will be near... Lauderdale around 115 PM CDT. Marion and Toomsuba around 130 PM CDT. PRECAUTIONARY/PREPAREDNESS ACTIONS... Frequent cloud to ground lightning is occurring with this storm. Lightning can strike 10 miles away from a thunderstorm. Seek a safe shelter inside a building or vehicle. && LAT...LON 3262 8874 3264 8851 3238 8842 3237 8872 TIME...MOT...LOC 1801Z 350DEG 13KT 3255 8860 HJS
Special weather statement, Jul 24, 5:14 PM CDT, 0 minutes before
Special Weather Statement
National Weather Service Jackson MS
514 PM CDT Sat Jul 24 2021
MSZ028-242245-
Montgomery MS-
514 PM CDT Sat Jul 24 2021
...A STRONG THUNDERSTORM WILL AFFECT SOUTHEASTERN MONTGOMERY COUNTY
UNTIL 545 PM CDT...
At 513 PM CDT, Meteorologists were tracking a strong thunderstorm
near Poplar Creek, or 16 miles southeast of Winona, moving south at
10 mph.
Winds in excess of 40 mph will be possible with this storm.
This storm will remain over mainly rural areas of southeastern
Montgomery County.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
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.
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 3329 8945 3328 8947 3329 8955 3341 8955
3342 8945
TIME...MOT...LOC 2213Z 338DEG 9KT 3334 8949
19The office that day
Everything else NWS Jackson, MS issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 23, 8:37 PM CDT | Special Weather Statement | JAN | Winston | 38 min |
| Jul 24, 1:02 PM CDT | Special Weather Statement | JAN | Lauderdale | 28 min |
| Jul 24, 2:55 PM CDT | Heat Advisory | JAN | Adams, Attala, Bolivar, Carroll, Choctaw, Claiborne and 41 more | 28 hr |
| Jul 24, 5:15 PM CDT | Special Weather Statement | JAN | Stone | 30 min |
| Jul 24, 5:18 PM CDT | Special Weather Statement | JAN | Jasper | 27 min |
Nearby
Special Weather Statements in Mississippi, 2021Every special weather statement in 2021
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.