Alert archive / Maryland / River Flood Warnings in 2008

River Flood Warning 19, NWS Philadelphia/Mount Holly

March 5, 2008Cecil County, Harford County, Maryland

NWS Philadelphia/Mount Holly issued this river flood warning at Mar 5, 2008, 10:14 PM EST for Cecil County, Harford County, Maryland. It took effect at Mar 6, 2008, 8:53 AM EST. It was in force for 21 hr.

The area

The counties it named.

The facts

Issued: Mar 5, 2008, 10:14 PM EST (03:14 UTC)
In effect from: Mar 6, 2008, 8:53 AM EST
Expired: Mar 7, 2008, 5:24 AM EST
In force: 21 hr
Issued by: NWS Philadelphia/Mount Holly
Flood severity: Moderate

Counties Cecil County, MD, Harford County, MD

The radar

The Dover AFB radar (KDOX), 100 km from the middle of the area, began a volume at 03:19 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 river

Written for the forecast point Susquehanna River at Conowingo Dam (CNWM2). The gauge peaked at 25.39 ft at Mar 6, 2008, 4:00 PM EST.

Action stage: 21.5 ft
Minor stage: 23.5 ft
Moderate stage: 24.8 ft
Major stage: 28.5 ft

This gauge today: stage, forecast and historic crests

Stage from the USGS instantaneous record for site 01578310, one reading an hour, from a day before the product to a day after it ended. Flood stages are today's.

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WGUS41 KPHI 060314
FLWPHI
BULLETIN - IMMEDIATE BROADCAST REQUESTED
FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1014 PM EST WED MAR 05 2008

...THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A FLOOD 
WARNING FOR THE SUSQUEHANNA RIVER IN MARYLAND BELOW THE CONOWINGO
DAM...
 
MODERATE FLOODING IS FORECAST FOR THE SUSQUEHANNA RIVER.

MDC015-025-060914-
/O.NEW.KPHI.FL.W.0019.080306T1518Z-000000T0000Z/
/CNWM2.2.ER.080306T1518Z.080307T0000Z.000000T0000Z.NO/
1014 PM EST WED MAR 05 2008

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A 

* FLOOD WARNING FOR 
  THE SUSQUEHANNA RIVER BELOW THE CONOWINGO DAM.
* AT 10:00 PM ON WEDNESDAY, THE STAGE WAS 19.8 FEET. 
* MODERATE FLOODING IS FORECAST FROM THURSDAY AFTERNOON INTO 
  THURSDAY EVENING. 
* THE FLOOD STAGE IS 23.5 FEET. 
* THE RIVER IS FORECAST TO RISE ABOVE FLOOD STAGE BY LATE
  THURSDAY MORNING AND IT SHOULD CONTINUE TO RISE TO NEAR 26.0 FEET
  BY THURSDAY EVENING.
* IMPACT...AT 26.3 FEET, NOTIFICATION LEVEL 6 WITH 26 TO 32 GATES
  OPEN AT CONOWINGO DAM.

$$

                   FLD      OBSERVED          FORECAST
 LOCATION          STG    STG  DAY TIME       CREST

SUSQUEHANNA RIVER
  CONOWINGO DAM    23.5   19.8  WED 10 PM    26.0  THU 7 PM 

&&

IOVINO

5 follow-up statements

000 
WGUS81 KPHI 060856
FLSPHI
FLOOD STATEMENT 
NATIONAL WEATHER SERVICE MT HOLLY, NEW JERSEY
356 AM EST THU MAR 06 2008

...THE FLOOD WARNING CONTINUES FOR THE FOLLOWING RIVERS IN MARYLAND...
 
  SUSQUEHANNA BELOW CONOWINGO DAM AFFECTING CECIL AND HARFORD COUNTIES 

...MODERATE FLOODING IS FORECAST FOR THE SUSQUEHANNA RIVER...

MDC015-025-061856-
/O.EXT.KPHI.FL.W.0019.080306T1353Z-000000T0000Z/
/CNWM2.2.ER.080306T1353Z.080307T0000Z.000000T0000Z.NO/
356 AM EST THU MAR 06 2008

THE FLOOD WARNING CONTINUES FOR THE SUSQUEHANNA BELOW CONOWINGO DAM.
* UNTIL FURTHER NOTICE...OR UNTIL THE WARNING IS CANCELLED.
* AT 3:30 AM THURSDAY THE STAGE WAS 22.1 FEET AND RISING. 
* MODERATE FLOODING IS FORECAST. 
* FLOOD STAGE IS 23.5 FEET. 
* THE RIVER IS FORECAST TO RISE TO ABOVE FLOOD STAGE LATER THIS
  MORNING AND THEN CONTINUE TO RISE TO NEAR 26.1 FEET BY THIS
  EVENING. READINGS ARE INFLUENCED BY RELEASES AT THE DAM AND MAY
  VARY SOMEWHAT FROM THIS FORECAST.  
* IMPACT...AT 26.3 FEET...NOTIFICATION LEVEL 6 WITH 26 TO 32 GATES
  OPEN AT CONOWINGO DAM.

$$

                   FLD      OBSERVED          FORECAST
 LOCATION          STG    STG  DAY TIME       CREST

SUSQUEHANNA RIVER
  CONOWINGO DAM    23.5   22.11  THU 3 AM    26.1  THU 7 PM 

&&

000 
WGUS81 KPHI 061627
FLSPHI
FLOOD STATEMENT 
NATIONAL WEATHER SERVICE MT HOLLY, NEW JERSEY
1127 AM EST THU MAR 06 2008

...THE FLOOD WARNING CONTINUES FOR THE FOLLOWING RIVERS IN MARYLAND...

  SUSQUEHANNA BELOW CONOWINGO DAM AFFECTING CECIL AND HARFORD COUNTIES 

...MINOR FLOODING IS OCCURRING AND MODERATE FLOODING IS FORECAST FOR 
SUSQUEHANNA RIVER...

MDC015-025-070227-
/O.CON.KPHI.FL.W.0019.000000T0000Z-000000T0000Z/
/CNWM2.2.ER.080306T1241Z.080307T0100Z.000000T0000Z.NO/
1127 AM EST THU MAR 06 2008

THE FLOOD WARNING CONTINUES FOR 
  THE SUSQUEHANNA BELOW CONOWINGO DAM.
* UNTIL FURTHER NOTICE...OR UNTIL THE WARNING IS CANCELLED.
* AT 10:30 AM THURSDAY THE STAGE WAS 24.5 FEET. 
* MINOR FLOODING IS OCCURRING AND MODERATE FLOODING IS FORECAST.
* FLOOD STAGE IS 23.5 FEET. 
* FORECAST...THE RIVER WILL CONTINUE RISING TO NEAR 25.5 FEET BY THIS 
  EVENING THEN BEGIN FALLING. READINGS ARE INFLUENCED BY RELEASES AT 
  DAM AND MAY VARY SOMEWHAT FROM THIS FORECAST.
* IMPACT...AT 24.8 FEET...NOTIFICATION LEVEL 5 WITH 21 TO 25 GATES OPEN 
  AT CONOWINGO DAM. BACKYARDS AND BASEMENTS ON MAIN STREET AND TOMES 
  LANDING BEGIN TO FLOOD.

$$

                   FLD      OBSERVED          FORECAST
 LOCATION          STG    STG  DAY TIME       CREST

SUSQUEHANNA RIVER
  CONOWINGO DAM    23.5   24.47  THU 10 AM   25.5  THU 8 PM 

&&

000 
WGUS81 KPHI 070054
FLSPHI
FLOOD STATEMENT 
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
753 PM EST THU MAR 06 2008

...THE FLOOD WARNING CONTINUES FOR THE SUSQUEHANNA RIVER IN MARYLAND
BELOW THE CONOWINGO DAM...
 
MINOR TO MODERATE FLOODING IS OCCURRING ON THE SUSQUEHANNA RIVER IN 
MARYLAND.

MDC015-025-071053-
/O.CON.KPHI.FL.W.0019.000000T0000Z-000000T0000Z/
/CNWM2.2.ER.080306T1241Z.080306T2030Z.000000T0000Z.NO/
753 PM EST THU MAR 06 2008

THE FLOOD WARNING CONTINUES FOR 
  THE SUSQUEHANNA RIVER BELOW THE CONOWINGO DAM.
* AT 7:30 PM ON THURSDAY, THE STAGE WAS 24.7 FEET AND FLUCTUATING. 
* MINOR TO MODERATE FLOODING IS OCCURRING.
* FLOOD STAGE IS 23.5 FEET. 
* A BROAD CREST WAS MOVING THROUGH THE AREA OF THE CONOWINGO DAM
  THIS EVENING.  THE RIVER LEVEL WILL CONTINUE TO FLUCTUATE AROUND 
  25.0 FEET THIS EVENING, THEN THE LEVEL SHOULD BEGIN TO FALL LATE
  TONIGHT.
* THE SUSQUEHANNA SHOULD FALL BACK BELOW FLOOD STAGE AT CONOWINGO 
  DAM EARLY ON SATURDAY. 
* READINGS ARE INFLUENCED BY RELEASES AT THE DAM AND THEY MAY VARY 
  SOMEWHAT FROM THE FORECAST.
  
$$

                   FLD      OBSERVED          FORECAST
 LOCATION          STG    STG  DAY TIME       CREST

SUSQUEHANNA RIVER
  CONOWINGO DAM    23.5   24.7  THU 730 PM    CRESTING 

&&

IOVINO

000 
WGUS81 KPHI 071022
FLSPHI
FLOOD STATEMENT 
NATIONAL WEATHER SERVICE MT HOLLY, NEW JERSEY
522 AM EST FRI MAR 07 2008

...THE FLOOD WARNING IS CANCELLED FOR THE SUSQUEHANNA RIVER IN MARYLAND BELOW
THE CONOWINGO DAM...
    
MDC015-025-071052-
/O.CAN.KPHI.FL.W.0019.000000T0000Z-080307T1022Z/
/CNWM2.2.ER.080306T1241Z.080306T2030Z.080307T0818Z.NO/
522 AM EST FRI MAR 07 2008

* AT 4:30 AM FRIDAY THE STAGE WAS 23.4 FEET AND FALLING.  
* FLOOD STAGE IS 23.5 FEET.
* THE CREST HAS MOVED PAST THE DAM AND OVERALL, THE LEVEL CONTINUES TO FALL.  
* READINGS ARE INFLUENCED BY RELEASES AT THE DAM AND MAY VARY AROUND FLOOD STAGE       THIS MORNING. MORE RISES ARE EXPECTED LATER THIS WEEKEND. 

$$

                   FLD      OBSERVED          FORECAST
 LOCATION          STG    STG  DAY TIME       CREST

SUSQUEHANNA RIVER
  CONOWINGO DAM    23.5   23.43  FRI 4 AM    CRESTED AND FALLING      

&&

000 
WGUS81 KPHI 071024 CCA
FLSPHI

FLOOD STATEMENT 
NATIONAL WEATHER SERVICE MT HOLLY, NEW JERSEY
522 AM EST FRI MAR 07 2008

...THE FLOOD WARNING IS CANCELLED FOR THE SUSQUEHANNA RIVER IN 
MARYLAND BELOW THE CONOWINGO DAM...
    
MDC015-025-071052-
/O.CAN.KPHI.FL.W.0019.000000T0000Z-080307T1022Z/
/CNWM2.2.ER.080306T1241Z.080306T2030Z.080307T0818Z.NO/
522 AM EST FRI MAR 07 2008

* AT 4:30 AM FRIDAY THE STAGE WAS 23.4 FEET AND FALLING.  
* FLOOD STAGE IS 23.5 FEET.
* THE CREST HAS MOVED PAST THE DAM AND OVERALL, THE LEVEL 
  CONTINUES TO FALL.  
* READINGS ARE INFLUENCED BY RELEASES AT THE DAM AND MAY 
  VARY AROUND FLOOD STAGE THIS MORNING. MORE RISES ARE EXPECTED      
  LATER THIS WEEKEND. 

$$

                   FLD      OBSERVED          FORECAST
 LOCATION          STG    STG  DAY TIME       CREST

SUSQUEHANNA RIVER
  CONOWINGO DAM    23.5   23.43  FRI 4 AM    CRESTED AND             
                                               FALLING      

&&

PO

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Mar 6, 3:22 PM EST	Flood Watch	PHI	Cecil	51 hr

Nearby

River Flood Warnings in Maryland, 2008 Every river flood warning in 2008

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive; the gauge from the NWS water service and the USGS.