Thunderstorms with heavy rain resulted in an isolated instance of flash flooding in Okaloosa County.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS MOB wrote it up.
Thunderstorms with heavy rain resulted in an isolated instance of flash flooding in Okaloosa County.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Mobile, AL wrote its last area forecast discussion before the first event at Sep 20, 11:48 AM CST, 2 hours 32 minutes earlier.
Area Forecast Discussion National Weather Service Mobile AL 1248 PM CDT Mon Sep 20 2021 .NEAR TERM /Now Through Tuesday/...A shortwave trof which extends from the north central Gulf states to across Illinois/Indiana shifts slowly eastward and weakens through Tuesday as an amplifying upper trof advances across the Plains. An associated surface low located well to the north brings a cold front from the Plains into the southeast states on Tuesday, which advances into northwestern Mississippi by Tuesday afternoon. Water vapor satellite data shows that much drier air has moved into the area, and when compared with model soundings, this drier air is located mostly above 800 mb and impacts interior areas more so compared to closer to the coast. With daytime heating, expect scattered convective development during the rest of the afternoon, and a few strong storms are possible into the early evening hours as the drier air aloft aids in enhancing downdraft production. As the shortwave trof moves slowly away from the area through the remainder of the period, model soundings show that the drier air aloft becomes confined to above 600 mb overnight as moistening occurs beneath this. Have gone with chance to good chance pops on Tuesday as scattered convective development is expected to occur with daytime heating along with some support from a modest sea breeze and the proximity of the approaching front in the afternoon. Highs this afternoon will be mainly in the mid 80s then highs on Tuesday will be mostly in the mid to upper 80s. Lows tonight will be in the lower 70s inland with mid 70s at the immediate coast. A low risk of rip currents is expected through Tuesday. /29 && .AVIATION... 18Z issuance...Scattered showers and storms are possible this afternoon, then dry conditions develop this evening except for near the coast where isolated to scattered showers and storms may develop later tonight. Isolated to potentially scattered showers and storms then begin to develop further inland Tuesday morning. MVFR conditions will be possible with the stronger showers and storms. VFR conditions otherwise prevail, except for late tonight into early Tuesday morning when IFR conditions in low ceilings and fog may occur. Southerly winds around 5 knots this afternoon become light and variable tonight, then a southwesterly flow around 5 knots develops Tuesday morning. /29 && .MOB WATCHES/WARNINGS/ADVISORIES... AL...None. FL...None. MS...None. GM...None. && This product is also available on the web at: http://weather.gov/mob
Special Weather Statement
National Weather Service Mobile AL
1250 PM CDT Mon Sep 20 2021
FLZ203-201830-
Santa Rosa Inland FL-
1250 PM CDT Mon Sep 20 2021
...A strong thunderstorm will impact portions of northeastern Santa
Rosa County through 130 PM CDT...
At 1249 PM CDT, Doppler radar was tracking a strong thunderstorm 4
miles north of Roeville, or 8 miles north of Milton, moving northeast
at 15 mph.
HAZARD...Winds in excess of 40 mph.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects.
This storm will remain over mainly rural areas of northeastern Santa
Rosa County.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 3070 8705 3076 8707 3092 8679 3069 8679
TIME...MOT...LOC 1749Z 235DEG 14KT 3075 8699
MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPHSpecial Weather Statement
National Weather Service Mobile AL
102 PM CDT Mon Sep 20 2021
FLZ203-205-201845-
Okaloosa Inland FL-Santa Rosa Inland FL-
102 PM CDT Mon Sep 20 2021
...A strong thunderstorm will impact portions of northwestern
Okaloosa and east central Santa Rosa Counties through 145 PM CDT...
At 102 PM CDT, Doppler radar was tracking a strong thunderstorm 11
miles northeast of Roeville, or 15 miles northeast of Milton, moving
northeast at 15 mph.
HAZARD...Winds in excess of 40 mph.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects.
Locations impacted include...
Baker.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 3071 8696 3085 8691 3099 8660 3071 8660
TIME...MOT...LOC 1802Z 244DEG 12KT 3081 8688
MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPHSpecial Weather Statement
National Weather Service Mobile AL
124 PM CDT Mon Sep 20 2021
FLZ203-205-201915-
Okaloosa Inland FL-Santa Rosa Inland FL-
124 PM CDT Mon Sep 20 2021
...A strong thunderstorm will impact portions of northwestern
Okaloosa and east central Santa Rosa Counties through 215 PM CDT...
At 123 PM CDT, National Weather Service doppler radar indicated a
strong thunderstorm 9 miles northeast of Roeville, or 13 miles
northeast of Milton, moving east at 15 mph.
HAZARD...Wind gusts up to 50 mph and pea size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor damage to outdoor objects is
possible.
Locations impacted include...
just west of Baker to Baker.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.
&&
LAT...LON 3065 8695 3079 8690 3089 8660 3064 8660
TIME...MOT...LOC 1823Z 262DEG 12KT 3075 8687
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...50 MPHSpecial Weather Statement
National Weather Service Mobile AL
244 PM CDT Mon Sep 20 2021
FLZ205-202030-
Okaloosa Inland FL-
244 PM CDT Mon Sep 20 2021
...A strong thunderstorm will impact portions of east central
Okaloosa County through 330 PM CDT...
At 244 PM CDT, National Weather Service doppler radar indicated a
strong thunderstorm over Crestview, moving northeast at 15 mph.
HAZARD...Wind gusts up to 50 mph and pea size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor damage to outdoor objects is
possible.
Locations impacted include...
Crestview.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.
&&
LAT...LON 3066 8668 3084 8667 3084 8639 3057 8639
TIME...MOT...LOC 1944Z 240DEG 13KT 3074 8657
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...50 MPHThe Eglin Afb radar (KEVX), 64 km away, was scanning. The volume nearest the first event began at 20:19 UTC.
1 flash flood. Local standard time, as filed.
Flooding reported at the intersection of Brookmeade Dr and Goodwin Ave, as well as Highway 85 and Main St.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Florida in 2021Every state in 2021This day in weather historyWarnings in Florida, September 2021
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 987308.