Alert archive / Iowa / Special Weather Statements in 2016

Special Weather Statement, NWS Quad Cities, IA

June 21, 2016Iowa County, Iowa

NWS Quad Cities, IA issued this special weather statement at Jun 21, 2016, 11:13 PM CDT for Iowa County, Iowa. It was in force for 32 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 21, 2016, 11:13 PM CDT (04:13 UTC)
Expired: Jun 21, 2016, 11:45 PM CDT
In force: 32 min
Issued by: NWS Quad Cities, IA

County Iowa County, IA

The radar

The Quad Cities radar (KDVN), 114 km from the middle of the area, began a volume at 04:15 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

Davenport, (KDVN), launched 00:00Z, 4.2 hours before the alert went out and 120 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2283 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 14 m²/s²
0-3 km storm-relative helicity: 128 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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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 Quad Cities, IA wrote its last area forecast discussion before this special weather statement went out at Jun 21, 10:56 PM CDT, 17 minutes earlier.

Area forecast discussion, Jun 21, 10:56 PM CDT, 17 minutes before

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Hazardous weather outlook, Jun 21, 3:58 PM CDT, 7 hours 15 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
358 PM CDT TUE JUN 21 2016

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-222100-
BUCHANAN-DELAWARE-DUBUQUE-BENTON-LINN-JONES-JACKSON-IOWA-JOHNSON-
CEDAR-CLINTON-MUSCATINE-SCOTT-KEOKUK-WASHINGTON-LOUISA-JEFFERSON-
HENRY IA-DES MOINES-VAN BUREN-LEE-JO DAVIESS-STEPHENSON-CARROLL-
WHITESIDE-ROCK ISLAND-HENRY IL-BUREAU-PUTNAM-MERCER-HENDERSON-
WARREN-HANCOCK-MCDONOUGH-SCOTLAND-CLARK-
358 PM CDT TUE JUN 21 2016

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTH CENTRAL
ILLINOIS...NORTHWEST ILLINOIS...WEST CENTRAL ILLINOIS...EAST
CENTRAL IOWA...NORTHEAST IOWA...SOUTHEAST IOWA AND NORTHEAST
MISSOURI.

.DAY ONE...THIS AFTERNOON AND TONIGHT

TONIGHT...SEVERE STORMS ARE POSSIBLE AND THE STORM PREDICTION
CENTER HAS A SLIGHT RISK IN PLACE FOR MUCH OF THE OUTLOOK AREA.
THE MAIN SEVERE WEATHER THREATS WILL BE LARGE HAIL AND DAMAGING
WINDS. THERE WILL ALSO BE A THREAT OF HEAVY RAINFALL AND THE
POTENTIAL FOR FLASH FLOODING AS STORMS CONTINUE THROUGH THE NIGHT
ACROSS THE ENTIRE OUTLOOK AREA. AS A RESULT...A FLASH FLOOD WATCH
IS IN EFFECT FOR MUCH OF EASTERN IOWA AND NORTHWEST ILLINOIS.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

THUNDERSTORMS WILL LIKELY BE ONGOING WEDNESDAY MORNING ACROSS THE
AREA. SOME OF THESE STORMS COULD BE SEVERE WITH DAMAGING
WINDS....LARGE HAIL AND LOCALLY HEAVY RAINFALL ACROSS THE AREA.
LATER IN THE AFTERNOON...SUPERCELL THUNDERSTORMS COULD DEVELOP...
ESPECIALLY ALONG AND NORTH OF INTERSTATE 80. LARGE HAIL...DAMAGING
WINDS...HEAVY RAINFALL AND TORNADOES WILL BE POSSIBLE WITH THESE
STORMS. THESE STORMS WILL LIKELY GROW UPSCALE INTO A LARGE
THUNDERSTORM COMPLEX TOWARDS EVENING EAST OF THE MISSISSIPPI RIVER.
THE STORM PREDICTION CENTER HAS MUCH OF THE AREA IN AN ENHANCED OR
MODERATE RISK FOR SEVERE WEATHER.

WITH THE HOT TEMPERATURES AND HIGH HUMIDITY ACROSS THE AREA ON
WEDNESDAY...HEAT INDICES SHOULD REACH 100 TO 105 SOUTH OF INTERSTATE
80.

THERE IS A CHANCE FOR SHOWERS AND THUNDERSTORMS SATURDAY NIGHT AND
SUNDAY ACROSS THE AREA. AT THIS TIME IT IS TOO SOON TO TELL IF THE
STORMS WILL BE SEVERE.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED TONIGHT AND WILL LIKELY BE NEEDED
WEDNESDAY.

HAASE

In the hours before

Special weather statement, Jun 21, 10:06 PM CDT, 1 hour 7 minutes before

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Special weather statement, Jun 21, 11:13 PM CDT, 0 minutes before

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The office that day

Everything else NWS Quad Cities, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 21, 10:06 PM CDT	Special Weather Statement	DVN	Jefferson, Van Buren	24 min
Jun 21, 11:16 PM CDT	Special Weather Statement	DVN	Jefferson, Keokuk, Washington	59 min
Jun 22, 12:00 AM CDT	Special Weather Statement	DVN	Keokuk, Washington	30 min
Jun 22, 1:37 AM CDT	Flash Flood Warning	DVN	Benton, Iowa, Johnson, Linn	6 hr
Jun 22, 2:56 AM CDT	Special Weather Statement	DVN	Louisa	49 min
Jun 22, 3:02 AM CDT	Severe Thunderstorm Warning	DVN	Louisa	43 min
Jun 22, 3:07 AM CDT	Special Weather Statement	DVN	Johnson	38 min
Jun 22, 3:22 AM CDT	Severe Thunderstorm Warning	DVN	Des Moines	53 min
Jun 22, 4:18 AM CDT	Flash Flood Warning	DVN	Johnson, Louisa, Muscatine, Washington	6 hr
Jun 22, 4:23 AM CDT	River Flood Warning	DVN	Cedar, Louisa, Muscatine	3 days
Jun 22, 4:23 AM CDT	Heat Advisory	DVN	Des Moines, Henry, Jefferson, Lee, Van Buren	15 hr
Jun 22, 9:13 AM CDT	Special Weather Statement	DVN	Benton, Cedar, Johnson, Linn, Louisa, Muscatine	3 hr
Jun 22, 9:54 AM CDT	River Flood Watch	DVN	Louisa	63 hr
Jun 22, 9:54 AM CDT	River Flood Watch	DVN	Louisa	4 days
Jun 22, 9:54 AM CDT	River Flood Watch	DVN	Louisa	4 days
Jun 22, 6:25 PM CDT	Special Weather Statement	DVN	Clinton	35 min
Jun 22, 12:08 AM CDT	Special Weather Statement	DVN	Mercer	37 min
Jun 22, 3:48 AM CDT	Severe Thunderstorm Warning	DVN	Warren	42 min
Jun 22, 6:30 PM CDT	Severe Thunderstorm Warning	DVN	Whiteside	60 min
Jun 22, 6:31 PM CDT	Special Weather Statement	DVN	Carroll	29 min
Jun 22, 6:57 PM CDT	Special Weather Statement	DVN	Whiteside	48 min

Nearby

Special Weather Statements in Iowa, 2016 Every special weather statement in 2016

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.