Alert archive / Iowa / Special Weather Statements in 2020
Special Weather Statement, NWS Des Moines, IA
NWS Des Moines, IA issued this special weather statement at Jun 18, 2020, 6:39 PM CDT for 6 counties in Iowa. It was in force for 81 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
- Jun 18, 2020, 6:39 PM CDT (23:39 UTC)
- Expired
- Jun 18, 2020, 8:00 PM CDT
- In force
- 81 min
- Issued by
- NWS Des Moines, IA
Counties Cerro Gordo County, IA, Hancock County, IA, Humboldt County, IA, Kossuth County, IA, Winnebago County, IA, Worth County, IA
The radar
The Des Moines radar (KDMX), 159 km from the middle of the area, began a volume at 23:41 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
Minneapolis, MN (KMPX), launched 12:00Z, 11.7 hours before the alert went out and 189 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
- 39 J/kg
- Mixed-layer CIN
- -270 J/kg
- Mixed-layer LCL
- 1316 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 319 m²/s²
- 0-3 km storm-relative helicity
- 276 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 Des Moines, IA wrote its last area forecast discussion before this special weather statement went out at Jun 18, 6:35 PM CDT, 4 minutes earlier.
Area forecast discussion, Jun 18, 6:35 PM CDT, 4 minutes before
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</html>Hazardous weather outlook, Jun 18, 2:13 PM CDT, 4 hours 26 minutes before
Hazardous Weather Outlook National Weather Service Des Moines IA 213 PM CDT Thu Jun 18 2020 IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075- 081>086-092>097-191915- Emmet-Kossuth-Winnebago-Worth-Palo Alto-Hancock-Cerro Gordo- Pocahontas-Humboldt-Wright-Franklin-Butler-Bremer-Sac-Calhoun- Webster-Hamilton-Hardin-Grundy-Black Hawk-Crawford-Carroll-Greene- Boone-Story-Marshall-Tama-Audubon-Guthrie-Dallas-Polk-Jasper- Poweshiek-Cass-Adair-Madison-Warren-Marion-Mahaska-Adams-Union- Clarke-Lucas-Monroe-Wapello-Taylor-Ringgold-Decatur-Wayne- Appanoose-Davis- 213 PM CDT Thu Jun 18 2020 This Hazardous Weather Outlook is for portions of central Iowa. .DAY ONE...This afternoon and tonight Thunderstorms become more widespread across western Iowa late this afternoon and evening, then spread east across central Iowa late this evening and overnight. A few storms may be strong to severe this evening producing damaging winds. Pockets of heavier rainfall may occur through the overnight hours, but any flash flood threat would likely be confined to urban areas. .DAYS TWO THROUGH SEVEN...Friday through Wednesday Additional thunderstorms are forecast Friday and Saturday. The severe threat looks to remain marginal, but confidence in the extent of the threat is low. Thunderstorms may be efficient rainfall producers, which could lead to flooding concerns if any areas experience multiple rounds of heavy rainfall through the weekend. Thunderstorms are possible again Sunday night into Monday. The severe threat is unknown at this time. .SPOTTER INFORMATION STATEMENT... Spotter reports may be needed if storms become severe later this afternoon and evening. Rainfall reports will be beneficial.
In the hours before
Special weather statement, Jun 18, 4:10 PM CDT, 2 hours 29 minutes before
Special Weather Statement
National Weather Service Des Moines IA
410 PM CDT Thu Jun 18 2020
IAZ033-044-182215-
Sac IA-Crawford IA-
410 PM CDT Thu Jun 18 2020
...STRONG STORMS CAPABLE OF STRONG WIND GUSTS ARE MOVING IN...
At 408 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Ute to near Dunlap. Movement was northeast
at 25 mph.
Nickel size hail and wind gusts of 50 to 55 mph will be possible with
these storms.
Locations impacted include...
Denison, Dunlap, Schleswig, Manilla, Dow City, Charter Oak, Vail,
Kiron, Deloit, Ricketts, Arion, Buck Grove, Aspinwall and Denison
Municipal Airport.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
office in Des Moines.
&&
LAT...LON 4220 9567 4221 9560 4221 9532 4225 9532
4228 9515 4186 9509 4186 9562 4216 9567
TIME...MOT...LOC 2108Z 237DEG 26KT 4205 9566 4182 9557
BoksaSpecial weather statement, Jun 18, 5:54 PM CDT, 45 minutes before
Special Weather Statement National Weather Service Des Moines IA 554 PM CDT Thu Jun 18 2020 IAZ004-005-015-023-024-034-035-182345- Palo Alto IA-Humboldt IA-Kossuth IA-Calhoun IA-Webster IA- Pocahontas IA-Emmet IA- 554 PM CDT Thu Jun 18 2020 ...ENTER HEADLINE AS NEEDED... At 551 PM CDT, Doppler radar was tracking strong thunderstorms along a line extending from Ingham Lake to near Rockwell City. Movement was northeast at 25 mph. Nickel size hail and wind gusts of 50 to 55 mph will be possible with these storms. Rainfall amounts up to one inch will be possible with these storms. Locations impacted include... Fort Dodge, Algona, Emmetsburg, Rockwell City, Dakota City, Humboldt, Manson, Swan Lake, Five Island Lake, Union Slogh, Fort Dodge Regional Airport, North Twin Lake, Armstrong, West Bend, Bancroft, Coalville, Rolfe, Badger, Swea City and Burt. PRECAUTIONARY/PREPAREDNESS ACTIONS... Torrential rainfall is also occurring with these storms, and may lead to localized ponding of water...especially on roadways. Do not drive your vehicle through flooded roadways. These storms 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 4350 9397 4247 9397 4234 9461 4344 9469 TIME...MOT...LOC 2251Z 254DEG 22KT 4333 9466 4240 9458 Boksa
Special weather statement, Jun 18, 5:58 PM CDT, 41 minutes before
Special Weather Statement
National Weather Service Des Moines IA
558 PM CDT Thu Jun 18 2020
IAZ004-005-015-023-024-034-035-190000-
Palo Alto IA-Humboldt IA-Kossuth IA-Calhoun IA-Webster IA-
Pocahontas IA-Emmet IA-
558 PM CDT Thu Jun 18 2020
...STRONG THUNDERSTORMS ARE MOVING THROUGH THE AREA...
At 557 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Swan Lake to near North Twin Lake.
Movement was northeast at 25 mph.
Nickel size hail and wind gusts of 50 to 55 mph will be possible with
these storms.
Rainfall amounts up to one inch will be possible with these storms.
Locations impacted include...
Fort Dodge, Algona, Rockwell City, Dakota City, Humboldt, Manson,
Union Slogh, Fort Dodge Regional Airport, Armstrong, West Bend,
Bancroft, Coalville, Rolfe, Badger, Otho, Swea City, Burt,
Whittemore, Gilmore City and Titonka.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential rainfall is also occurring with these storms, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
These storms 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.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
office in Des Moines .
&&
LAT...LON 4350 9398 4241 9397 4235 9461 4343 9460
4350 9410
TIME...MOT...LOC 2257Z 221DEG 30KT 4336 9457 4246 9458
BoksaLocal storm report, Jun 18, 6:03 PM CDT, 36 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
603 PM CDT THU JUN 18 2020
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0455 PM TSTM WND DMG ODEBOLT 42.31N 95.25W
06/18/2020 SAC IA BROADCAST MEDIA
DELAYED REPORT - TIME ESTIMATED VIA RADAR.
KMEG REPORT WITH PICTURE OF LARGE TREES
DOWN.
&&Special weather statement, Jun 18, 6:39 PM CDT, 0 minutes before
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</html>The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 18, 4:10 PM CDT | Special Weather Statement | DMX | Crawford | 65 min |
| Jun 18, 4:54 PM CDT | Severe Thunderstorm Warning | DMX | Calhoun, Crawford, Sac | 38 min |
| Jun 18, 5:54 PM CDT | Special Weather Statement | DMX | Emmet, Humboldt, Kossuth, Webster | 51 min |
| Jun 18, 5:58 PM CDT | Special Weather Statement | DMX | Humboldt, Kossuth, Webster | 62 min |
| Jun 18, 6:19 PM CDT | Severe Thunderstorm Warning | DMX | Humboldt, Kossuth, Pocahontas | 22 min |
| Jun 18, 6:55 PM CDT | Severe Thunderstorm Warning | DMX | Hancock, Kossuth, Winnebago, Worth | 50 min |
Nearby
Special Weather Statements in Iowa, 2020Every special weather statement 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.